/* roulang page: index */
:root {
    --primary: #00e5ff;
    --primary-rgb: 0, 229, 255;
    --primary-glow: rgba(0, 229, 255, 0.35);
    --accent: #ff2d78;
    --accent-rgb: 255, 45, 120;
    --accent-glow: rgba(255, 45, 120, 0.35);
    --bg-deep: #080c18;
    --bg-dark: #0d1226;
    --bg-card: #131a30;
    --bg-card-hover: #1a2340;
    --bg-soft: rgba(255, 255, 255, 0.04);
    --text-main: #e6ecff;
    --text-strong: #ffffff;
    --text-weak: #8f9bb3;
    --text-faint: #5a6a85;
    --border: rgba(255, 255, 255, 0.08);
    --border-light: rgba(255, 255, 255, 0.16);
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --shadow-sm: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 40px rgba(0, 229, 255, 0.12);
    --header-height: 72px;
    --transition: all .25s ease;
    --container-width: 1200px;
}

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    font-size: 16px;
    line-height: 1.7;
    color: var(--text-main);
    background: var(--bg-deep);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 60% at 20% 0%, rgba(0, 229, 255, 0.06), transparent 60%),
        radial-gradient(ellipse 60% 40% at 90% 20%, rgba(255, 45, 120, 0.05), transparent 60%),
        radial-gradient(ellipse 60% 50% at 50% 100%, rgba(0, 229, 255, 0.04), transparent 60%);
    pointer-events: none;
    z-index: 0;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    display: block;
}

button,
input,
summary {
    font-family: inherit;
    font-size: inherit;
}

ul,
ol {
    list-style: none;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 3px;
    border-radius: 4px;
}

.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
    position: relative;
    z-index: 1;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 50px;
    font-weight: 600;
    font-size: 15px;
    line-height: 1.4;
    border: 1px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    letter-spacing: 0.02em;
}

.btn-sm {
    padding: 8px 20px;
    font-size: 14px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), #00b8d4);
    color: #04121f;
    box-shadow: 0 4px 24px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 36px var(--primary-glow);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: 0 2px 12px var(--primary-glow);
}

.btn-ghost {
    background: transparent;
    border-color: var(--border-light);
    color: var(--text-main);
}

.btn-ghost:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
}

.btn-accent {
    background: linear-gradient(135deg, var(--accent), #ff5c9d);
    color: #fff;
    box-shadow: 0 4px 24px var(--accent-glow);
}

.btn-accent:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 36px var(--accent-glow);
}

.btn-accent:active {
    transform: translateY(0);
}

/* ===== Section common ===== */
.section-head {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 52px;
}

.section-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 16px;
    border-radius: 50px;
    background: rgba(var(--primary-rgb), 0.1);
    border: 1px solid rgba(var(--primary-rgb), 0.25);
    color: var(--primary);
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.section-head h2 {
    font-size: 36px;
    line-height: 1.3;
    color: var(--text-strong);
    font-weight: 800;
    letter-spacing: -0.01em;
    margin-bottom: 14px;
}

.section-head p {
    color: var(--text-weak);
    font-size: 17px;
    line-height: 1.7;
}

/* ===== Header ===== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-height);
    background: rgba(8, 12, 24, 0.82);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

.site-header.scrolled {
    background: rgba(8, 12, 24, 0.95);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    gap: 24px;
}

.logo {
    font-size: 20px;
    font-weight: 800;
    color: var(--text-strong);
    letter-spacing: 0.01em;
    display: flex;
    align-items: center;
    gap: 10px;
    white-space: nowrap;
}

.logo i {
    color: var(--primary);
    font-size: 22px;
    filter: drop-shadow(0 0 8px var(--primary-glow));
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    padding: 8px 16px;
    border-radius: 40px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-weak);
    transition: var(--transition);
    position: relative;
}

.nav-link:hover {
    color: var(--text-strong);
    background: rgba(255, 255, 255, 0.05);
}

.nav-link.active {
    color: var(--primary);
    background: rgba(var(--primary-rgb), 0.1);
    font-weight: 600;
}

.nav-link.active::after {
    content: "";
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 18px;
    height: 2px;
    border-radius: 2px;
    background: var(--primary);
    box-shadow: 0 0 8px var(--primary-glow);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
}

.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text-main);
    border-radius: 2px;
    transition: var(--transition);
}

.nav-toggle:hover span {
    background: var(--primary);
}

/* ===== Hero ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: calc(var(--header-height) + 60px) 0 80px;
    background-size: cover;
    background-position: center;
}

.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        linear-gradient(180deg, rgba(8, 12, 24, 0.78) 0%, rgba(8, 12, 24, 0.88) 50%, rgba(8, 12, 24, 0.97) 100%);
    z-index: 0;
}

.hero::after {
    content: "";
    position: absolute;
    inset: 0;
    background:
        linear-gradient(90deg, transparent 0%, rgba(0, 229, 255, 0.08) 50%, transparent 100%);
    opacity: 0.5;
    z-index: 0;
}

.hero-content {
    text-align: center;
    z-index: 2;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 22px;
    border-radius: 50px;
    background: rgba(var(--primary-rgb), 0.12);
    border: 1px solid rgba(var(--primary-rgb), 0.3);
    color: var(--primary);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.04em;
    margin-bottom: 28px;
    backdrop-filter: blur(4px);
}

.hero h1 {
    font-size: clamp(30px, 5vw, 56px);
    line-height: 1.2;
    font-weight: 800;
    color: var(--text-strong);
    letter-spacing: -0.02em;
    margin-bottom: 22px;
    max-width: 820px;
    margin-left: auto;
    margin-right: auto;
    background: linear-gradient(120deg, #ffffff 30%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-sub {
    font-size: 18px;
    line-height: 1.8;
    color: var(--text-weak);
    max-width: 680px;
    margin: 0 auto 36px;
}

.hero-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 60px;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 14px;
    flex-wrap: wrap;
    max-width: 880px;
    margin: 0 auto;
}

.stat-item {
    flex: 1 1 150px;
    min-width: 140px;
    padding: 20px 18px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    backdrop-filter: blur(6px);
    transition: var(--transition);
}

.stat-item:hover {
    border-color: rgba(var(--primary-rgb), 0.3);
    background: rgba(var(--primary-rgb), 0.08);
    transform: translateY(-3px);
}

.stat-item strong {
    display: block;
    font-size: 28px;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.2;
    margin-bottom: 6px;
}

.stat-item span {
    font-size: 14px;
    color: var(--text-weak);
}

/* ===== Features ===== */
.features {
    padding: 110px 0 70px;
    position: relative;
    z-index: 1;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.feature-card {
    background: linear-gradient(160deg, var(--bg-card) 0%, #10162a 100%);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 34px 26px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--primary), transparent);
    opacity: 0;
    transition: var(--transition);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-card:hover {
    border-color: rgba(var(--primary-rgb), 0.3);
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 14px;
    background: rgba(var(--primary-rgb), 0.12);
    color: var(--primary);
    font-size: 22px;
    margin-bottom: 20px;
    transition: var(--transition);
}

.feature-card:nth-child(2) .feature-icon {
    background: rgba(var(--accent-rgb), 0.12);
    color: var(--accent);
}

.feature-card:nth-child(3) .feature-icon {
    background: rgba(0, 220, 130, 0.12);
    color: #00dc82;
}

.feature-card:nth-child(4) .feature-icon {
    background: rgba(255, 180, 0, 0.12);
    color: #ffb400;
}

.feature-card:hover .feature-icon {
    transform: scale(1.08);
}

.feature-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-strong);
    margin-bottom: 10px;
}

.feature-card p {
    font-size: 14px;
    line-height: 1.7;
    color: var(--text-weak);
}

/* ===== Categories ===== */
.categories {
    padding: 80px 0 90px;
    position: relative;
    z-index: 1;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.category-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
    display: block;
    position: relative;
}

.category-card:hover {
    transform: translateY(-6px);
    border-color: rgba(var(--primary-rgb), 0.35);
    box-shadow: var(--shadow-md);
}

.category-cover {
    height: 190px;
    overflow: hidden;
    position: relative;
}

.category-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.category-card:hover .category-cover img {
    transform: scale(1.06);
}

.category-cover::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 40%, rgba(8, 12, 24, 0.7) 100%);
}

.category-body {
    padding: 24px 24px 28px;
    position: relative;
}

.category-body h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-strong);
    margin-bottom: 8px;
}

.category-body p {
    font-size: 14px;
    color: var(--text-weak);
    line-height: 1.7;
    margin-bottom: 16px;
}

.card-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--primary);
    font-size: 14px;
    font-weight: 600;
    transition: var(--transition);
}

.category-card:hover .card-link {
    gap: 12px;
    color: #fff;
}

/* ===== Advantages ===== */
.advantages {
    padding: 100px 0;
    background: rgba(255, 255, 255, 0.02);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    position: relative;
    z-index: 1;
}

.advantages-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.advantages-media {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.advantages-media img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.advantages-media:hover img {
    transform: scale(1.03);
}

.advantages-media::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 50%, rgba(8, 12, 24, 0.5) 100%);
}

.advantages-content .section-tag {
    margin-bottom: 12px;
}

.advantages-content h2 {
    font-size: 34px;
    line-height: 1.3;
    font-weight: 800;
    color: var(--text-strong);
    margin-bottom: 16px;
    letter-spacing: -0.01em;
}

.advantages-content > p {
    color: var(--text-weak);
    font-size: 16px;
    line-height: 1.8;
    margin-bottom: 32px;
}

.advantage-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.advantage-item {
    display: flex;
    gap: 16px;
    padding: 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.advantage-item:hover {
    border-color: rgba(var(--primary-rgb), 0.3);
    background: var(--bg-card-hover);
    transform: translateX(4px);
}

.advantage-icon {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    background: rgba(var(--primary-rgb), 0.12);
    color: var(--primary);
    font-size: 18px;
}

.advantage-item h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--text-strong);
    margin-bottom: 4px;
}

.advantage-item p {
    font-size: 14px;
    color: var(--text-weak);
    line-height: 1.6;
}

/* ===== News ===== */
.news-section {
    padding: 100px 0;
    position: relative;
    z-index: 1;
}

.news-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
    max-width: 960px;
    margin: 0 auto;
}

.news-item {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 0;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
}

.news-item:hover {
    border-color: rgba(var(--primary-rgb), 0.3);
    box-shadow: var(--shadow-sm);
    transform: translateY(-3px);
}

.news-cover {
    overflow: hidden;
    min-height: 170px;
}

.news-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.news-item:hover .news-cover img {
    transform: scale(1.05);
}

.news-content {
    padding: 22px 26px;
    display: flex;
    flex-direction: column;
}

.news-cat {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 30px;
    background: rgba(var(--primary-rgb), 0.1);
    color: var(--primary);
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 10px;
    width: fit-content;
}

.news-content h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
    line-height: 1.4;
}

.news-content h3 a {
    color: var(--text-strong);
    transition: var(--transition);
}

.news-content h3 a:hover {
    color: var(--primary);
}

.news-content p {
    font-size: 14px;
    color: var(--text-weak);
    line-height: 1.7;
    flex: 1;
    margin-bottom: 12px;
}

.news-content time {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-faint);
}

.news-empty {
    text-align: center;
    padding: 60px 30px;
    background: var(--bg-card);
    border: 1px dashed var(--border-light);
    border-radius: var(--radius-md);
    color: var(--text-weak);
    font-size: 16px;
}

/* ===== Testimonials ===== */
.testimonials {
    padding: 90px 0 100px;
    background: rgba(255, 255, 255, 0.02);
    border-top: 1px solid var(--border);
    position: relative;
    z-index: 1;
}

.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.testimonial-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 30px;
    transition: var(--transition);
    position: relative;
}

.testimonial-card:hover {
    border-color: rgba(var(--accent-rgb), 0.3);
    transform: translateY(-4px);
    box-shadow: var(--shadow-sm);
}

.testimonial-stars {
    color: #ffb400;
    font-size: 14px;
    letter-spacing: 2px;
    margin-bottom: 16px;
}

.testimonial-card blockquote {
    font-size: 15px;
    line-height: 1.8;
    color: var(--text-main);
    margin-bottom: 20px;
    font-style: normal;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 14px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.testimonial-avatar {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 16px;
    font-weight: 600;
    flex-shrink: 0;
}

.testimonial-author strong {
    display: block;
    font-size: 15px;
    color: var(--text-strong);
}

.testimonial-author span {
    font-size: 13px;
    color: var(--text-faint);
}

/* ===== FAQ ===== */
.faq-section {
    padding: 100px 0;
    position: relative;
    z-index: 1;
}

.faq-grid {
    max-width: 820px;
    margin: 0 auto;
    display: grid;
    gap: 16px;
}

.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: rgba(var(--primary-rgb), 0.25);
}

.faq-item summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 20px 24px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-strong);
    list-style: none;
    transition: var(--transition);
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: "\f078";
    font-family: "Font Awesome 6 Free";
    font-weight: 900;
    font-size: 13px;
    color: var(--primary);
    transition: var(--transition);
    flex-shrink: 0;
}

.faq-item[open] summary::after {
    transform: rotate(180deg);
}

.faq-item[open] summary {
    color: var(--primary);
    background: rgba(var(--primary-rgb), 0.04);
}

.faq-item p {
    padding: 0 24px 20px;
    font-size: 15px;
    color: var(--text-weak);
    line-height: 1.8;
    border-top: 1px solid transparent;
}

.faq-item[open] p {
    border-top-color: var(--border);
    padding-top: 16px;
}

/* ===== CTA ===== */
.cta-section {
    position: relative;
    padding: 110px 0;
    background-size: cover;
    background-position: center;
    z-index: 1;
}

.cta-section::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(8, 12, 24, 0.9), rgba(8, 12, 24, 0.96));
    z-index: 0;
}

.cta-box {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 680px;
    margin: 0 auto;
}

.cta-box h2 {
    font-size: 38px;
    line-height: 1.3;
    font-weight: 800;
    color: var(--text-strong);
    margin-bottom: 18px;
}

.cta-box p {
    font-size: 17px;
    color: var(--text-weak);
    line-height: 1.8;
    margin-bottom: 32px;
}

.cta-box .btn {
    padding: 16px 40px;
    font-size: 17px;
}

/* ===== Footer ===== */
.site-footer {
    background: #050810;
    border-top: 1px solid var(--border);
    padding: 60px 0 30px;
    position: relative;
    z-index: 1;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.6fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand .logo {
    margin-bottom: 14px;
    font-size: 20px;
}

.footer-brand p {
    font-size: 14px;
    color: var(--text-weak);
    line-height: 1.8;
    max-width: 360px;
}

.footer-col h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-strong);
    margin-bottom: 18px;
}

.footer-col ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-col a {
    font-size: 14px;
    color: var(--text-weak);
    transition: var(--transition);
}

.footer-col a:hover {
    color: var(--primary);
    padding-left: 4px;
}

.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.footer-bottom p {
    font-size: 14px;
    color: var(--text-faint);
}

.footer-bottom a {
    color: var(--text-faint);
    transition: var(--transition);
}

.footer-bottom a:hover {
    color: var(--primary);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .category-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .advantages-inner {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .advantages-media {
        min-height: 340px;
    }

    .testimonial-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }

    .header-nav {
        position: fixed;
        top: var(--header-height);
        right: 0;
        width: 280px;
        height: calc(100vh - var(--header-height));
        background: rgba(10, 14, 28, 0.98);
        backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: flex-start;
        padding: 32px 24px;
        gap: 6px;
        transform: translateX(100%);
        transition: transform 0.35s ease;
        border-left: 1px solid var(--border);
        z-index: 999;
    }

    .header-nav.open {
        transform: translateX(0);
    }

    .nav-link {
        font-size: 16px;
        padding: 12px 16px;
        width: 100%;
    }

    .nav-toggle {
        display: flex;
    }

    .header-actions .btn {
        display: none;
    }

    .hero {
        min-height: auto;
        padding: 120px 0 60px;
    }

    .hero h1 {
        font-size: 30px;
    }

    .hero-sub {
        font-size: 16px;
    }

    .section-head h2 {
        font-size: 28px;
    }

    .stat-item {
        min-width: 120px;
        padding: 16px 14px;
    }

    .stat-item strong {
        font-size: 24px;
    }

    .news-item {
        grid-template-columns: 1fr;
    }

    .news-cover {
        height: 200px;
        min-height: auto;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .cta-box h2 {
        font-size: 28px;
    }
}

@media (max-width: 520px) {
    .features-grid {
        grid-template-columns: 1fr;
    }

    .category-grid {
        grid-template-columns: 1fr;
    }

    .testimonial-grid {
        grid-template-columns: 1fr;
    }

    .hero-badge {
        font-size: 12px;
        padding: 6px 14px;
    }

    .hero-actions .btn {
        width: 100%;
    }

    .hero-stats {
        flex-direction: column;
        align-items: center;
    }

    .stat-item {
        width: 100%;
        max-width: 260px;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

/* roulang page: category1 */
:root{
  --primary:#00e5ff;
  --primary-dark:#00b8d4;
  --secondary:#7c4dff;
  --accent:#ff2d78;
  --bg-dark:#0a0e1a;
  --bg-surface:#111827;
  --bg-card:#1a2132;
  --text-light:#e8ecf4;
  --text-muted:#8892a6;
  --border:rgba(255,255,255,.08);
  --radius:16px;
  --radius-lg:24px;
  --shadow:0 8px 32px rgba(0,0,0,.4);
  --shadow-glow:0 0 32px rgba(0,229,255,.12);
  --transition:all .3s ease;
  --max-w:1200px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;font-size:16px;line-height:1.7;background:var(--bg-dark);color:var(--text-light);-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:var(--primary);text-decoration:none;transition:var(--transition)}
ul{list-style:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
.container{max-width:var(--max-w);margin:0 auto;padding:0 24px}
.section{padding:80px 0}
.section-header{text-align:center;max-width:720px;margin:0 auto 56px}
.section-badge{display:inline-flex;align-items:center;gap:8px;background:rgba(0,229,255,.1);border:1px solid rgba(0,229,255,.25);color:var(--primary);font-size:13px;font-weight:600;letter-spacing:1px;padding:6px 18px;border-radius:100px;margin-bottom:16px}
.section-title{font-size:38px;line-height:1.25;font-weight:800;color:var(--text-light);letter-spacing:-.5px}
.section-title span{color:var(--primary)}
.section-subtitle{color:var(--text-muted);font-size:17px;margin-top:14px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;font-weight:600;border-radius:12px;padding:14px 32px;font-size:15px;line-height:1;transition:var(--transition);position:relative;overflow:hidden}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#0a0e1a;box-shadow:0 4px 20px rgba(0,229,255,.25)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 32px rgba(0,229,255,.4);color:#0a0e1a}
.btn-outline{border:2px solid rgba(0,229,255,.5);color:var(--primary);background:transparent}
.btn-outline:hover{background:rgba(0,229,255,.1);transform:translateY(-2px);border-color:var(--primary)}
.btn-sm{padding:10px 20px;font-size:14px;border-radius:10px}
.btn-lg{padding:16px 40px;font-size:17px;border-radius:14px}
.btn-block{width:100%;justify-content:center}

/* Header */
.site-header{background:rgba(10,14,26,.85);backdrop-filter:blur(20px);border-bottom:1px solid var(--border);position:sticky;top:0;z-index:1000}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:80px;gap:16px}
.logo{display:inline-flex;align-items:center;gap:10px;font-size:22px;font-weight:800;color:var(--text-light);letter-spacing:-.5px}
.logo i{color:var(--primary);font-size:20px}
.header-nav{display:flex;align-items:center;gap:4px}
.nav-link{display:inline-flex;align-items:center;gap:6px;padding:10px 18px;border-radius:10px;color:var(--text-muted);font-weight:500;font-size:15px}
.nav-link:hover{color:var(--text-light);background:rgba(255,255,255,.05)}
.nav-link.active{color:var(--primary);background:rgba(0,229,255,.1)}
.header-actions{display:flex;align-items:center;gap:12px}
.nav-toggle{display:none;flex-direction:column;gap:5px;padding:10px}
.nav-toggle span{width:22px;height:2px;background:var(--text-light);border-radius:2px;transition:var(--transition)}

/* Hero */
.hero{position:relative;padding:120px 0 100px;background:url('/assets/images/backpic/back-1.webp') center/cover no-repeat}
.hero::before{content:'';position:absolute;inset:0;background:linear-gradient(135deg,rgba(10,14,26,.95) 20%,rgba(10,14,26,.75) 60%,rgba(0,229,255,.15))}
.hero::after{content:'';position:absolute;bottom:0;left:0;right:0;height:120px;background:linear-gradient(transparent,var(--bg-dark))}
.hero-content{position:relative;z-index:2;max-width:720px}
.hero-badge{display:inline-flex;align-items:center;gap:8px;background:rgba(0,229,255,.15);border:1px solid rgba(0,229,255,.3);color:var(--primary);font-size:14px;font-weight:600;padding:8px 20px;border-radius:100px;margin-bottom:24px}
.hero-badge i{font-size:16px}
.hero-title{font-size:54px;line-height:1.15;font-weight:900;color:#fff;letter-spacing:-1px;margin-bottom:20px}
.hero-title span{background:linear-gradient(90deg,var(--primary),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.hero-subtitle{font-size:18px;color:rgba(232,236,244,.8);line-height:1.8;margin-bottom:36px;max-width:600px}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:48px}
.hero-stats{display:flex;gap:40px;flex-wrap:wrap}
.hero-stat{display:flex;flex-direction:column;gap:4px}
.hero-stat strong{font-size:30px;font-weight:800;color:#fff;line-height:1.2}
.hero-stat strong i{color:var(--primary);font-style:normal}
.hero-stat span{font-size:13px;color:var(--text-muted)}

/* Section Features */
.features-section{background:var(--bg-surface);position:relative}
.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feature-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:36px 28px;transition:var(--transition);position:relative;overflow:hidden}
.feature-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--primary),var(--secondary));opacity:0;transition:var(--transition)}
.feature-card:hover{transform:translateY(-6px);box-shadow:var(--shadow);border-color:rgba(0,229,255,.2)}
.feature-card:hover::before{opacity:1}
.feature-icon{width:56px;height:56px;border-radius:14px;background:linear-gradient(135deg,rgba(0,229,255,.15),rgba(124,77,255,.15));display:flex;align-items:center;justify-content:center;font-size:24px;color:var(--primary);margin-bottom:22px}
.feature-card h3{font-size:20px;font-weight:700;margin-bottom:12px;color:#fff}
.feature-card p{color:var(--text-muted);font-size:14px;line-height:1.8}
.feature-card .card-img{border-radius:12px;margin-bottom:20px;overflow:hidden}
.feature-card .card-img img{width:100%;height:180px;object-fit:cover;transition:transform .4s ease}
.feature-card:hover .card-img img{transform:scale(1.04)}

/* Process */
.process-section{position:relative}
.process-section::before{content:'';position:absolute;top:0;left:50%;width:1px;height:100%;background:linear-gradient(var(--primary),transparent);opacity:.2}
.process-steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;position:relative}
.process-step{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:32px 24px;text-align:center;transition:var(--transition);position:relative}
.process-step:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:rgba(0,229,255,.25)}
.step-number{width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--secondary));color:#0a0e1a;font-weight:800;font-size:18px;display:flex;align-items:center;justify-content:center;margin:0 auto 20px;box-shadow:0 0 20px rgba(0,229,255,.3)}
.process-step h3{font-size:18px;font-weight:700;color:#fff;margin-bottom:10px}
.process-step p{font-size:14px;color:var(--text-muted);line-height:1.7}
.step-arrow{position:absolute;top:50%;right:-18px;transform:translateY(-50%);z-index:2;color:var(--primary);font-size:18px;opacity:.6}

/* Scenario */
.scenario-section{background:var(--bg-surface)}
.scenario-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.scenario-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:32px 24px;transition:var(--transition)}
.scenario-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:rgba(124,77,255,.3)}
.scenario-icon{width:50px;height:50px;border-radius:12px;background:rgba(124,77,255,.15);display:flex;align-items:center;justify-content:center;font-size:20px;color:var(--secondary);margin-bottom:18px}
.scenario-card h3{font-size:18px;font-weight:700;color:#fff;margin-bottom:10px}
.scenario-card p{font-size:14px;color:var(--text-muted);line-height:1.7}
.scenario-tag{display:inline-block;background:rgba(0,229,255,.1);color:var(--primary);font-size:12px;padding:4px 12px;border-radius:100px;margin-top:14px;font-weight:600}

/* Security */
.security-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.security-item{display:flex;gap:20px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:28px 24px;transition:var(--transition)}
.security-item:hover{border-color:rgba(0,229,255,.2)}
.security-icon{flex-shrink:0;width:44px;height:44px;border-radius:12px;background:linear-gradient(135deg,rgba(0,229,255,.15),rgba(124,77,255,.15));display:flex;align-items:center;justify-content:center;color:var(--primary);font-size:18px}
.security-item h3{font-size:17px;font-weight:700;color:#fff;margin-bottom:6px}
.security-item p{font-size:14px;color:var(--text-muted);line-height:1.6}

/* FAQ */
.faq-section{background:var(--bg-surface)}
.faq-list{max-width:820px;margin:0 auto}
.faq-item{background:var(--bg-card);border:1px solid var(--border);border-radius:14px;margin-bottom:14px;overflow:hidden;transition:var(--transition)}
.faq-item:hover{border-color:rgba(0,229,255,.2)}
.faq-question{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:24px 28px;font-size:17px;font-weight:600;color:var(--text-light);cursor:pointer}
.faq-question i{color:var(--primary);transition:var(--transition);font-size:14px}
.faq-item.open .faq-question i{transform:rotate(180deg)}
.faq-answer{display:none;padding:0 28px 24px;color:var(--text-muted);font-size:15px;line-height:1.8}
.faq-item.open .faq-answer{display:block}

/* CTA */
.cta-section{padding:80px 0;position:relative;background:url('/assets/images/backpic/back-2.png') center/cover no-repeat}
.cta-section::before{content:'';position:absolute;inset:0;background:linear-gradient(135deg,rgba(10,14,26,.92),rgba(124,77,255,.25))}
.cta-card{position:relative;z-index:2;text-align:center;max-width:640px;margin:0 auto;background:rgba(17,24,39,.7);border:1px solid rgba(0,229,255,.2);border-radius:var(--radius-lg);padding:56px 48px;backdrop-filter:blur(16px)}
.cta-title{font-size:34px;font-weight:800;color:#fff;margin-bottom:16px}
.cta-subtitle{font-size:16px;color:rgba(232,236,244,.8);margin-bottom:32px;line-height:1.8}
.cta-actions{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}

/* Footer */
.site-footer{background:#0d1219;border-top:1px solid var(--border);padding:60px 0 0}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:48px;padding-bottom:40px}
.footer-brand p{color:var(--text-muted);font-size:14px;line-height:1.8;margin-top:16px}
.footer-col h3{font-size:16px;font-weight:700;color:#fff;margin-bottom:20px}
.footer-col ul li{margin-bottom:10px}
.footer-col ul a{color:var(--text-muted);font-size:14px;transition:var(--transition)}
.footer-col ul a:hover{color:var(--primary)}
.footer-bottom{border-top:1px solid var(--border);padding:24px 0;display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
.footer-bottom p{color:var(--text-muted);font-size:13px}

/* Responsive */
@media(max-width:1024px){
  .hero-title{font-size:44px}
  .feature-grid{grid-template-columns:repeat(3,1fr);gap:16px}
  .process-steps{grid-template-columns:repeat(2,1fr);gap:20px}
  .scenario-grid{grid-template-columns:repeat(2,1fr)}
  .security-grid{grid-template-columns:repeat(2,1fr)}
  .step-arrow{display:none}
}
@media(max-width:768px){
  .site-header{padding:0}
  .header-nav{display:none;position:absolute;top:80px;left:0;right:0;background:rgba(10,14,26,.98);flex-direction:column;padding:16px 24px;gap:8px;border-bottom:1px solid var(--border)}
  .header-nav.open{display:flex}
  .header-nav .nav-link{padding:14px 16px;font-size:15px;width:100%}
  .nav-toggle{display:flex}
  .hero{padding:80px 0}
  .hero-title{font-size:34px}
  .hero-subtitle{font-size:16px}
  .hero-stats{gap:24px}
  .hero-stat strong{font-size:24px}
  .feature-grid{grid-template-columns:1fr}
  .section-title{font-size:28px}
  .section{padding:56px 0}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .cta-card{padding:40px 24px}
  .cta-title{font-size:28px}
}
@media(max-width:520px){
  .hero-title{font-size:28px}
  .hero-actions{flex-direction:column;width:100%}
  .hero-actions .btn{width:100%}
  .process-steps{grid-template-columns:1fr}
  .scenario-grid{grid-template-columns:1fr}
  .security-grid{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;text-align:center}
  .header-actions .btn-sm{padding:8px 14px;font-size:13px}
}

/* roulang page: article */
:root {
            --primary: #00e5ff;
            --primary-deep: #00b8d4;
            --accent: #8b7cff;
            --bg-deep: #070b14;
            --bg-dark: #0d1424;
            --bg-card: #111a2e;
            --text-1: #f1f5f9;
            --text-2: #a0aec0;
            --text-3: #64748b;
            --border: rgba(148, 163, 184, 0.12);
            --gradient: linear-gradient(135deg, #00e5ff 0%, #00b8d4 45%, #8b7cff 100%);
            --radius-lg: 24px;
            --radius: 16px;
            --radius-sm: 10px;
            --shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
            --shadow-neon: 0 0 24px rgba(0, 229, 255, 0.18);
            --transition: all 0.3s ease;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            background: var(--bg-deep);
            color: var(--text-2);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

        img {
            max-width: 100%;
            display: block;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color 0.3s ease, background 0.3s ease, border-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
        }

        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        .container-narrow {
            max-width: 900px;
        }

        /* ===== Header ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(7, 11, 20, 0.86);
            backdrop-filter: blur(22px);
            -webkit-backdrop-filter: blur(22px);
            border-bottom: 1px solid var(--border);
            transition: box-shadow 0.3s ease, background 0.3s ease;
        }

        .site-header.scrolled {
            box-shadow: 0 6px 24px rgba(0, 0, 0, 0.45);
            background: rgba(7, 11, 20, 0.96);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
            gap: 24px;
        }

        .logo {
            font-size: 1.32rem;
            font-weight: 900;
            color: var(--text-1);
            display: flex;
            align-items: center;
            gap: 10px;
            letter-spacing: 0.5px;
            white-space: nowrap;
            transition: opacity 0.3s ease;
        }

        .logo:hover {
            opacity: 0.85;
        }

        .logo i {
            color: var(--primary);
            font-size: 1.2rem;
            filter: drop-shadow(0 0 8px rgba(0, 229, 255, 0.55));
        }

        .header-nav {
            display: flex;
            gap: 4px;
            align-items: center;
        }

        .header-nav .nav-link {
            padding: 10px 18px;
            border-radius: 10px;
            font-size: 0.93rem;
            font-weight: 500;
            color: var(--text-2);
            transition: all 0.3s ease;
            position: relative;
        }

        .header-nav .nav-link:hover {
            color: var(--text-1);
            background: rgba(255, 255, 255, 0.05);
        }

        .header-nav .nav-link.active {
            color: var(--primary);
            background: rgba(0, 229, 255, 0.1);
            box-shadow: inset 0 0 0 1px rgba(0, 229, 255, 0.18);
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 14px;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            border-radius: 12px;
            font-weight: 700;
            font-size: 0.95rem;
            padding: 14px 28px;
            border: none;
            cursor: pointer;
            transition: all 0.3s ease;
            letter-spacing: 0.3px;
        }

        .btn-primary {
            background: linear-gradient(135deg, #00f0ff, #00d4ff 50%, #8b7cff);
            color: #001018;
            box-shadow: 0 4px 22px rgba(0, 229, 255, 0.28);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 34px rgba(0, 229, 255, 0.42);
            color: #001018;
        }

        .btn-outline {
            background: transparent;
            color: var(--text-1);
            border: 1px solid rgba(148, 163, 184, 0.3);
        }

        .btn-outline:hover {
            border-color: var(--primary);
            color: var(--primary);
            box-shadow: 0 0 16px rgba(0, 229, 255, 0.12);
        }

        .btn-sm {
            padding: 9px 20px;
            font-size: 0.85rem;
            border-radius: 10px;
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 10px 8px;
            border-radius: 8px;
            background: transparent;
            transition: background 0.3s ease;
        }

        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.05);
        }

        .nav-toggle span {
            display: block;
            width: 22px;
            height: 2px;
            background: var(--text-1);
            border-radius: 4px;
            transition: all 0.3s ease;
        }

        .nav-toggle.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
            background: var(--primary);
        }

        .nav-toggle.active span:nth-child(2) {
            opacity: 0;
        }

        .nav-toggle.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
            background: var(--primary);
        }

        /* ===== Article Hero ===== */
        .article-hero {
            position: relative;
            padding: 100px 0 68px;
            background: var(--bg-dark);
            overflow: hidden;
        }

        .article-hero-bg {
            position: absolute;
            inset: 0;
            z-index: 0;
            background-size: cover;
            background-position: center;
            opacity: 0.26;
        }

        .article-hero-bg::after {
            content: "";
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at center, transparent 0%, var(--bg-deep) 88%);
        }

        .article-hero-inner {
            position: relative;
            z-index: 1;
            max-width: 860px;
            margin: 0 auto;
            text-align: center;
        }

        .article-category {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 0.82rem;
            font-weight: 700;
            letter-spacing: 2px;
            color: var(--primary);
            padding: 7px 18px;
            border-radius: 100px;
            background: rgba(0, 229, 255, 0.1);
            border: 1px solid rgba(0, 229, 255, 0.25);
            margin-bottom: 22px;
            text-transform: uppercase;
        }

        .article-course-hero h1,
        .article-hero-inner h1 {
            font-size: 2.7rem;
            font-weight: 900;
            line-height: 1.25;
            color: var(--text-1);
            letter-spacing: -0.02em;
            max-width: 800px;
            margin: 0 auto;
            text-shadow: 0 2px 30px rgba(0, 0, 0, 0.4);
        }

        .article-meta {
            display: flex;
            justify-content: center;
            gap: 28px;
            flex-wrap: wrap;
            margin-top: 26px;
            color: var(--text-3);
            font-size: 0.9rem;
        }

        .article-meta .meta-item {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .article-meta .meta-item i {
            color: var(--primary);
            opacity: 0.8;
            font-size: 0.9rem;
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb {
            padding: 18px 0;
            background: var(--bg-deep);
            border-bottom: 1px solid var(--border);
        }

        .breadcrumb .container {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 0.88rem;
            color: var(--text-3);
            flex-wrap: wrap;
        }

        .breadcrumb a {
            color: var(--text-2);
            font-weight: 500;
        }

        .breadcrumb a:hover {
            color: var(--primary);
        }

        .breadcrumb .sep {
            color: var(--text-3);
            opacity: 0.5;
        }

        .breadcrumb .current {
            color: var(--text-2);
            font-weight: 500;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
            max-width: 320px;
        }

        /* ===== Article Section ===== */
        .article-section {
            padding: 70px 0 90px;
            background: var(--bg-deep);
            position: relative;
        }

        .article-body {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 52px 56px;
            box-shadow: var(--shadow);
        }

        .article-body h2 {
            font-size: 1.75rem;
            color: var(--text-1);
            font-weight: 800;
            margin: 2.2em 0 1em;
            line-height: 1.35;
            position: relative;
            padding-left: 20px;
        }

        .article-body h2::before {
            content: "";
            position: absolute;
            left: 0;
            top: 0.18em;
            width: 5px;
            height: 1.35em;
            border-radius: 6px;
            background: var(--gradient);
        }

        .article-body h3 {
            font-size: 1.42rem;
            color: var(--text-1);
            font-weight: 700;
            margin: 1.8em 0 0.8em;
            line-height: 1.4;
        }

        .article-body h4 {
            font-size: 1.15rem;
            color: var(--text-1);
            font-weight: 700;
            margin: 1.5em 0 0.6em;
        }

        .article-body p {
            margin-bottom: 1.4em;
            color: var(--text-2);
            font-size: 1.03rem;
        }

        .article-body strong {
            color: var(--text-1);
            font-weight: 700;
        }

        .article-body a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 4px;
        }

        .article-body a:hover {
            color: #5df0ff;
        }

        .article-body ul,
        .article-body ol {
            margin: 0 0 1.6em;
            padding-left: 1.6em;
        }

        .article-body li {
            margin-bottom: 0.65em;
            color: var(--text-2);
        }

        .article-body li::marker {
            color: var(--primary);
        }

        .article-body blockquote {
            margin: 2em 0;
            padding: 26px 30px;
            border-left: 4px solid var(--primary);
            background: rgba(0, 229, 255, 0.05);
            border-radius: 0 16px 16px 0;
            color: var(--text-1);
            font-weight: 500;
            font-size: 1.05rem;
        }

        .article-body blockquote p {
            margin-bottom: 0;
            color: var(--text-1);
        }

        .article-body table {
            width: 100%;
            margin: 2em 0;
            border-collapse: collapse;
            font-size: 0.95rem;
        }

        .article-body th,
        .article-body td {
            padding: 14px 16px;
            border: 1px solid var(--border);
            text-align: left;
            color: var(--text-2);
        }

        .article-body th {
            background: rgba(255, 255, 255, 0.04);
            color: var(--text-1);
            font-weight: 700;
        }

        .article-body tbody tr:hover {
            background: rgba(255, 255, 255, 0.02);
        }

        .article-body img {
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            margin: 26px 0;
            width: auto;
            max-width: 100%;
        }

        .article-body iframe {
            width: 100%;
            border-radius: var(--radius);
            margin: 20px 0;
            border: 1px solid var(--border);
        }

        .article-body pre {
            background: #0a0f1c;
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 18px 22px;
            overflow-x: auto;
            margin: 1.6em 0;
            color: #b6e8ff;
            font-size: 0.9rem;
            line-height: 1.7;
        }

        .article-body pre code {
            background: none;
            padding: 0;
            color: inherit;
        }

        .article-body code {
            background: rgba(0, 229, 255, 0.08);
            color: #8be9fd;
            padding: 3px 8px;
            border-radius: 6px;
            font-size: 0.88em;
        }

        /* ===== Article Empty ===== */
        .article-empty {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 70px 40px;
            text-align: center;
            box-shadow: var(--shadow);
        }

        .article-empty .empty-icon {
            width: 76px;
            height: 76px;
            margin: 0 auto 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: rgba(0, 229, 255, 0.08);
            border: 1px solid rgba(0, 229, 255, 0.2);
            font-size: 1.7rem;
            color: var(--primary);
        }

        .article-empty h2 {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--text-1);
            margin-bottom: 14px;
        }

        .article-empty p {
            color: var(--text-3);
            font-size: 1rem;
            max-width: 420px;
            margin: 0 auto 28px;
        }

        .article-empty .btn {
            min-width: 170px;
        }

        /* ===== Article CTA ===== */
        .article-cta {
            margin-top: 44px;
            padding: 54px 48px;
            border-radius: var(--radius-lg);
            background: linear-gradient(135deg, rgba(0, 229, 255, 0.09), rgba(139, 124, 255, 0.09));
            border: 1px solid rgba(0, 229, 255, 0.18);
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .article-cta::before {
            content: "";
            position: absolute;
            top: -60%;
            left: -20%;
            width: 140%;
            height: 220%;
            background: radial-gradient(ellipse at center, rgba(0, 229, 255, 0.04) 0%, transparent 65%);
            pointer-events: none;
        }

        .article-cta h2 {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--text-1);
            margin-bottom: 14px;
            letter-spacing: -0.01em;
        }

        .article-cta p {
            color: var(--text-2);
            font-size: 1.06rem;
            max-width: 540px;
            margin: 0 auto 28px;
        }

        .article-cta .btn {
            margin: 0 8px 8px;
        }

        /* ===== Related Cards ===== */
        .related-cards {
            margin-top: 70px;
        }

        .related-cards .section-head {
            text-align: center;
            margin-bottom: 36px;
        }

        .related-cards .section-head h2 {
            font-size: 1.7rem;
            font-weight: 800;
            color: var(--text-1);
            margin-bottom: 8px;
        }

        .related-cards .section-head p {
            color: var(--text-3);
            font-size: 0.98rem;
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .related-card {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            overflow: hidden;
            display: block;
            transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
        }

        .related-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow);
            border-color: rgba(0, 229, 255, 0.35);
        }

        .related-card .card-img {
            overflow: hidden;
            position: relative;
        }

        .related-card .card-img img {
            width: 100%;
            height: 188px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }

        .related-card:hover .card-img img {
            transform: scale(1.05);
        }

        .related-card .card-img::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(to bottom, transparent 65%, rgba(7, 11, 20, 0.6));
        }

        .related-card .card-content {
            padding: 24px 24px 28px;
        }

        .related-card .card-content h3 {
            color: var(--text-1);
            font-weight: 700;
            font-size: 1.12rem;
            margin-bottom: 10px;
        }

        .related-card .card-content p {
            color: var(--text-3);
            font-size: 0.9rem;
            line-height: 1.7;
        }

        .related-card .card-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            color: var(--primary);
            font-size: 0.88rem;
            font-weight: 600;
            margin-top: 16px;
            transition: gap 0.3s ease;
        }

        .related-card .card-link i {
            transition: transform 0.3s ease;
        }

        .related-card:hover .card-link i {
            transform: translateX(4px);
        }

        /* ===== Feature Strip ===== */
        .feature-strip {
            padding: 70px 0;
            background: var(--bg-dark);
            border-top: 1px solid var(--border);
            border-bottom: 1px solid var(--border);
        }

        .feature-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .feature-item {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 26px;
            text-align: center;
            transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
        }

        .feature-item:hover {
            transform: translateY(-4px);
            border-color: rgba(0, 229, 255, 0.3);
            box-shadow: var(--shadow);
        }

        .feature-icon {
            width: 52px;
            height: 52px;
            margin: 0 auto 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 14px;
            background: linear-gradient(135deg, rgba(0, 229, 255, 0.15), rgba(139, 124, 255, 0.15));
            border: 1px solid rgba(0, 229, 255, 0.22);
            font-size: 1.25rem;
            color: var(--primary);
        }

        .feature-item h3 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-1);
            margin-bottom: 8px;
        }

        .feature-item p {
            font-size: 0.88rem;
            color: var(--text-3);
            line-height: 1.7;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #050810;
            border-top: 1px solid var(--border);
            padding: 70px 0 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 48px;
            padding-bottom: 44px;
            border-bottom: 1px solid rgba(148, 163, 184, 0.08);
        }

        .footer-brand .logo {
            margin-bottom: 16px;
        }

        .footer-brand p {
            color: var(--text-3);
            font-size: 0.92rem;
            line-height: 1.8;
            max-width: 360px;
        }

        .footer-col h3 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-1);
            margin-bottom: 18px;
            position: relative;
            padding-bottom: 10px;
        }

        .footer-col h3::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: 0;
            width: 28px;
            height: 2px;
            background: var(--gradient);
            border-radius: 4px;
        }

        .footer-col ul {
            list-style: none;
            padding: 0;
        }

        .footer-col ul li {
            margin-bottom: 12px;
        }

        .footer-col ul li a {
            color: var(--text-3);
            font-size: 0.92rem;
            transition: color 0.3s ease, padding-left 0.3s ease;
        }

        .footer-col ul li a:hover {
            color: var(--primary);
            padding-left: 4px;
        }

        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            padding: 24px 0;
            color: var(--text-3);
            font-size: 0.86rem;
        }

        .footer-bottom p {
            margin: 0;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .header-nav .nav-link {
                padding: 10px 12px;
                font-size: 0.88rem;
            }

            .container {
                padding-left: 20px;
                padding-right: 20px;
            }

            .feature-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }

            .related-grid {
                grid-template-columns: repeat(3, 1fr);
                gap: 18px;
            }
        }

        @media (max-width: 768px) {
            .logo {
                font-size: 1.15rem;
            }

            .header-inner {
                height: 64px;
            }

            .nav-toggle {
                display: flex;
            }

            .header-nav {
                position: absolute;
                top: 64px;
                left: 0;
                right: 0;
                flex-direction: column;
                align-items: stretch;
                gap: 0;
                background: rgba(10, 16, 30, 0.98);
                backdrop-filter: blur(20px);
                border-bottom: 1px solid var(--border);
                padding: 12px 20px 18px;
                display: none;
                max-height: calc(100vh - 64px);
                overflow-y: auto;
                box-shadow: 0 24px 48px rgba(0, 0, 0, 0.55);
            }

            .header-nav.open {
                display: flex;
            }

            .header-nav .nav-link {
                padding: 14px 12px;
                border-radius: 10px;
                font-size: 0.95rem;
                border-bottom: 1px solid rgba(148, 163, 184, 0.06);
            }

            .header-nav .nav-link:last-child {
                border-bottom: none;
            }

            .header-actions .btn-sm {
                padding: 8px 14px;
                font-size: 0.8rem;
            }

            .article-hero {
                padding: 70px 0 45px;
            }

            .article-hero-inner h1 {
                font-size: 2rem;
            }

            .article-meta {
                gap: 14px;
                font-size: 0.82rem;
            }

            .breadcrumb {
                font-size: 0.8rem;
                overflow-x: auto;
                white-space: nowrap;
            }

            .article-section {
                padding: 50px 0 60px;
            }

            .article-body {
                padding: 32px 24px;
                border-radius: 18px;
            }

            .article-body h2 {
                font-size: 1.35rem;
                padding-left: 16px;
            }

            .article-body h3 {
                font-size: 1.18rem;
            }

            .article-cta {
                padding: 36px 24px;
            }

            .article-cta h2 {
                font-size: 1.4rem;
            }

            .related-grid {
                grid-template-columns: 1fr;
                gap: 16px;
                max-width: 420px;
                margin-left: auto;
                margin-right: auto;
            }

            .related-card .card-img img {
                height: 200px;
            }

            .article-empty {
                padding: 50px 24px;
            }

            .feature-strip {
                padding: 50px 0;
            }

            .feature-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
                padding-bottom: 32px;
            }

            .footer-bottom {
                flex-direction: column;
                text-align: center;
                gap: 6px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }

            .logo {
                font-size: 1.02rem;
                gap: 7px;
            }

            .logo i {
                font-size: 0.95rem;
            }

            .header-inner {
                gap: 12px;
            }

            .header-actions .btn-sm {
                padding: 8px 12px;
                font-size: 0.75rem;
            }

            .article-hero {
                padding: 54px 0 36px;
            }

            .article-hero-inner h1 {
                font-size: 1.6rem;
                line-height: 1.35;
            }

            .article-category {
                font-size: 0.72rem;
                padding: 6px 14px;
            }

            .article-meta {
                gap: 12px;
                flex-direction: column;
                align-items: center;
            }

            .breadcrumb .container {
                gap: 6px;
            }

            .article-section {
                padding: 40px 0 50px;
            }

            .article-body {
                padding: 24px 18px;
            }

            .article-body p {
                font-size: 0.97rem;
            }

            .article-cta {
                padding: 30px 18px;
                border-radius: 18px;
            }

            .article-cta .btn {
                display: flex;
                width: 100%;
                margin: 8px 0;
            }

            .related-cards {
                margin-top: 50px;
            }

            .related-cards .section-head h2 {
                font-size: 1.35rem;
            }

            .feature-item {
                padding: 20px 16px;
            }

            .footer-bottom {
                font-size: 0.78rem;
            }
        }

        @media (min-width: 769px) and (max-width: 1024px) {
            .header-nav .nav-link {
                padding: 8px 10px;
                font-size: 0.82rem;
            }

            .header-actions .btn-sm {
                padding: 8px 14px;
                font-size: 0.78rem;
            }
        }

/* roulang page: category2 */
:root {
        --primary: #00d4ff;
        --primary-dark: #00a8cc;
        --accent: #7c3aed;
        --accent-pink: #ec4899;
        --bg: #080c18;
        --bg-deep: #050811;
        --bg-alt: #0d1424;
        --card-bg: rgba(17, 25, 43, 0.78);
        --text: #f0f4ff;
        --text-muted: rgba(240, 244, 255, 0.66);
        --border: rgba(255, 255, 255, 0.08);
        --border-glow: rgba(0, 212, 255, 0.35);
        --radius: 16px;
        --radius-lg: 24px;
        --shadow: 0 10px 44px rgba(0, 0, 0, 0.5);
        --shadow-glow: 0 0 48px rgba(0, 212, 255, 0.12);
        --spacing: 5rem;
        --max-w: 1200px;
        --header-h: 72px;
    }
    *,
    *::before,
    *::after {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
    }
    html {
        scroll-behavior: smooth;
    }
    body {
        font-family: "Inter", "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
        background: var(--bg);
        color: var(--text);
        line-height: 1.72;
        font-size: 16px;
        -webkit-font-smoothing: antialiased;
    }
    img {
        max-width: 100%;
        display: block;
    }
    a {
        color: var(--primary);
        text-decoration: none;
        transition: color .25s ease;
    }
    a:hover {
        color: #7cf7ff;
    }
    button {
        font-family: inherit;
        border: none;
        cursor: pointer;
    }
    input,
    textarea {
        font-family: inherit;
    }
    .container {
        max-width: var(--max-w);
        margin: 0 auto;
        padding: 0 24px;
    }
    .site-header {
        position: sticky;
        top: 0;
        z-index: 999;
        height: var(--header-h);
        background: rgba(8, 12, 24, 0.82);
        backdrop-filter: blur(18px);
        -webkit-backdrop-filter: blur(18px);
        border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        box-shadow: 0 4px 24px rgba(0, 0, 0, 0.35);
    }
    .header-inner {
        display: flex;
        align-items: center;
        justify-content: space-between;
        height: var(--header-h);
        gap: 20px;
    }
    .logo {
        display: inline-flex;
        align-items: center;
        gap: 10px;
        font-size: 20px;
        font-weight: 800;
        letter-spacing: .5px;
        background: linear-gradient(135deg, #fff 0%, #00d4ff 50%, #7c3aed 100%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
        white-space: nowrap;
    }
    .logo i {
        -webkit-text-fill-color: var(--primary);
        background: none;
        font-size: 22px;
        filter: drop-shadow(0 0 8px rgba(0, 212, 255, 0.6));
    }
    .header-nav {
        display: flex;
        align-items: center;
        gap: 6px;
    }
    .nav-link {
        position: relative;
        color: var(--text-muted);
        font-size: 15px;
        font-weight: 600;
        padding: 8px 16px;
        border-radius: 10px;
        transition: color .2s, background .2s;
    }
    .nav-link:hover {
        color: #fff;
        background: rgba(255, 255, 255, 0.06);
    }
    .nav-link.active {
        color: #fff;
        background: rgba(0, 212, 255, 0.12);
    }
    .nav-link.active::after {
        content: "";
        position: absolute;
        left: 16px;
        right: 16px;
        bottom: 4px;
        height: 2px;
        border-radius: 2px;
        background: linear-gradient(90deg, var(--primary), var(--accent));
        box-shadow: 0 0 12px rgba(0, 212, 255, 0.5);
    }
    .header-actions {
        display: flex;
        align-items: center;
        gap: 14px;
    }
    .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        font-weight: 700;
        border-radius: 12px;
        padding: 12px 24px;
        font-size: 15px;
        transition: transform .2s, box-shadow .2s, background .2s, opacity .2s;
        border: 1px solid transparent;
        line-height: 1;
    }
    .btn i {
        font-size: 14px;
    }
    .btn-primary {
        background: linear-gradient(135deg, #00d4ff, #0090ff);
        color: #fff;
        box-shadow: 0 6px 24px rgba(0, 212, 255, 0.35);
    }
    .btn-primary:hover {
        background: linear-gradient(135deg, #33dcff, #14a2ff);
        color: #fff;
        transform: translateY(-2px);
        box-shadow: 0 10px 32px rgba(0, 212, 255, 0.45);
    }
    .btn-outline {
        background: transparent;
        border-color: rgba(0, 212, 255, 0.45);
        color: var(--primary);
    }
    .btn-outline:hover {
        background: rgba(0, 212, 255, 0.1);
        color: #fff;
        border-color: var(--primary);
        transform: translateY(-2px);
    }
    .btn-lg {
        padding: 16px 36px;
        font-size: 16px;
        border-radius: 14px;
    }
    .btn-sm {
        padding: 9px 18px;
        font-size: 14px;
        border-radius: 10px;
    }
    .btn:active {
        transform: translateY(0);
    }
    .btn:focus-visible,
    .nav-link:focus-visible,
    .nav-toggle:focus-visible {
        outline: 2px solid var(--primary);
        outline-offset: 3px;
    }
    .nav-toggle {
        display: none;
        flex-direction: column;
        justify-content: center;
        gap: 5px;
        width: 42px;
        height: 42px;
        background: rgba(255, 255, 255, 0.06);
        border-radius: 10px;
        padding: 10px;
    }
    .nav-toggle span {
        display: block;
        height: 2px;
        width: 100%;
        border-radius: 2px;
        background: #fff;
        transition: transform .25s, opacity .25s;
    }
    .nav-toggle.is-active span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }
    .nav-toggle.is-active span:nth-child(2) {
        opacity: 0;
    }
    .nav-toggle.is-active span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }
    .hero {
        position: relative;
        background-image: linear-gradient(160deg, rgba(5, 8, 18, 0.93), rgba(13, 18, 38, 0.89), rgba(8, 12, 24, 0.94)), url("/assets/images/backpic/back-1.webp");
        background-size: cover;
        background-position: center;
        padding: clamp(70px, 9vw, 120px) 0 60px;
        overflow: hidden;
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }
    .hero::before {
        content: "";
        position: absolute;
        top: -120px;
        right: -80px;
        width: 380px;
        height: 380px;
        background: radial-gradient(circle, rgba(0, 212, 255, 0.22), transparent 65%);
        border-radius: 50%;
        pointer-events: none;
    }
    .hero::after {
        content: "";
        position: absolute;
        bottom: -100px;
        left: -60px;
        width: 320px;
        height: 320px;
        background: radial-gradient(circle, rgba(124, 58, 237, 0.23), transparent 65%);
        border-radius: 50%;
        pointer-events: none;
    }
    .hero-inner {
        position: relative;
        z-index: 2;
        max-width: 860px;
    }
    .hero-badge {
        display: inline-flex;
        align-items: center;
        gap: 8px;
        padding: 8px 18px;
        border-radius: 40px;
        background: rgba(0, 212, 255, 0.12);
        border: 1px solid rgba(0, 212, 255, 0.28);
        font-size: 14px;
        font-weight: 600;
        color: var(--primary);
        letter-spacing: 4px;
        margin-bottom: 24px;
    }
    .hero-badge i {
        font-size: 13px;
    }
    .hero-title {
        font-size: clamp(34px, 5.2vw, 62px);
        font-weight: 900;
        line-height: 1.18;
        letter-spacing: 1px;
        margin-bottom: 20px;
        background: linear-gradient(135deg, #fff 20%, #a5f7ff 65%, #7c3aed 110%);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
    }
    .hero-sub {
        font-size: clamp(16px, 2vw, 19px);
        color: var(--text-muted);
        max-width: 620px;
        margin-bottom: 34px;
        line-height: 1.8;
    }
    .hero-actions {
        display: flex;
        flex-wrap: wrap;
        gap: 16px;
        margin-bottom: 42px;
    }
    .hero-stats {
        display: flex;
        flex-wrap: wrap;
        gap: 14px 48px;
        padding-top: 16px;
        border-top: 1px solid rgba(255, 255, 255, 0.08);
    }
    .hero-stat {
        display: flex;
        flex-direction: column;
    }
    .hero-stat strong {
        font-size: 26px;
        font-weight: 800;
        color: #fff;
        letter-spacing: 1px;
    }
    .hero-stat strong i {
        color: var(--primary);
        font-size: 16px;
        margin-left: 2px;
    }
    .hero-stat span {
        font-size: 13px;
        color: var(--text-muted);
        margin-top: 2px;
    }
    .section {
        padding: var(--spacing) 0;
        position: relative;
    }
    .section-alt {
        background: var(--bg-alt);
    }
    .section-header {
        text-align: center;
        max-width: 700px;
        margin: 0 auto 48px;
    }
    .section-tag {
        display: inline-block;
        padding: 6px 16px;
        border-radius: 30px;
        background: rgba(0, 212, 255, 0.1);
        border: 1px solid rgba(0, 212, 255, 0.2);
        color: var(--primary);
        font-size: 13px;
        font-weight: 700;
        letter-spacing: 3px;
        margin-bottom: 16px;
    }
    .section-title {
        font-size: clamp(28px, 3.6vw, 42px);
        font-weight: 800;
        line-height: 1.3;
        margin-bottom: 14px;
    }
    .section-sub {
        color: var(--text-muted);
        font-size: 16px;
        line-height: 1.75;
    }
    .features-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
    }
    .feature-card {
        background: var(--card-bg);
        border: 1px solid var(--border);
        border-radius: var(--radius-lg);
        padding: 32px 28px;
        position: relative;
        overflow: hidden;
        transition: transform .3s, box-shadow .3s, border-color .3s;
    }
    .feature-card::before {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        height: 2px;
        background: linear-gradient(90deg, transparent, var(--primary), var(--accent), transparent);
        opacity: 0;
        transition: opacity .3s;
    }
    .feature-card:hover {
        transform: translateY(-6px);
        border-color: rgba(0, 212, 255, 0.28);
        box-shadow: var(--shadow), var(--shadow-glow);
    }
    .feature-card:hover::before {
        opacity: 1;
    }
    .feature-icon {
        width: 54px;
        height: 54px;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 14px;
        background: linear-gradient(135deg, rgba(0, 212, 255, 0.16), rgba(124, 58, 237, 0.16));
        border: 1px solid rgba(0, 212, 255, 0.2);
        font-size: 22px;
        color: var(--primary);
        margin-bottom: 20px;
    }
    .feature-card h3 {
        font-size: 19px;
        font-weight: 700;
        margin-bottom: 8px;
    }
    .feature-card p {
        color: var(--text-muted);
        font-size: 14.5px;
        line-height: 1.7;
    }
    .modes-grid {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 24px;
    }
    .mode-card {
        background: var(--card-bg);
        border: 1px solid var(--border);
        border-radius: var(--radius-lg);
        overflow: hidden;
        transition: transform .3s, box-shadow .3s, border-color .3s;
    }
    .mode-card:hover {
        transform: translateY(-8px);
        border-color: rgba(124, 58, 237, 0.3);
        box-shadow: var(--shadow);
    }
    .mode-img {
        position: relative;
        height: 190px;
        overflow: hidden;
    }
    .mode-img img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: transform .4s;
    }
    .mode-card:hover .mode-img img {
        transform: scale(1.05);
    }
    .mode-img::after {
        content: "";
        position: absolute;
        inset: 0;
        background: linear-gradient(180deg, transparent 45%, rgba(8, 12, 24, 0.94));
    }
    .mode-tag {
        position: absolute;
        top: 14px;
        left: 14px;
        z-index: 2;
        padding: 5px 14px;
        border-radius: 30px;
        background: rgba(8, 12, 24, 0.7);
        backdrop-filter: blur(8px);
        border: 1px solid rgba(0, 212, 255, 0.3);
        color: var(--primary);
        font-size: 12px;
        font-weight: 700;
        letter-spacing: 1px;
    }
    .mode-content {
        padding: 24px;
    }
    .mode-content h3 {
        font-size: 19px;
        font-weight: 700;
        margin-bottom: 8px;
    }
    .mode-content p {
        color: var(--text-muted);
        font-size: 14.5px;
        line-height: 1.7;
        margin-bottom: 16px;
    }
    .mode-meta {
        display: flex;
        align-items: center;
        gap: 14px;
        flex-wrap: wrap;
    }
    .mode-meta span {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        font-size: 13px;
        color: var(--text-muted);
        background: rgba(255, 255, 255, 0.05);
        padding: 5px 12px;
        border-radius: 20px;
    }
    .mode-meta span i {
        color: var(--primary);
        font-size: 12px;
    }
    .steps {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 24px;
        counter-reset: step;
    }
    .step-item {
        position: relative;
        background: var(--card-bg);
        border: 1px solid var(--border);
        border-radius: var(--radius-lg);
        padding: 32px 24px 28px;
        transition: border-color .3s, transform .3s;
    }
    .step-item:hover {
        border-color: rgba(0, 212, 255, 0.3);
        transform: translateY(-4px);
    }
    .step-num {
        width: 44px;
        height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
        border-radius: 12px;
        background: linear-gradient(135deg, rgba(0, 212, 255, 0.2), rgba(124, 58, 237, 0.2));
        border: 1px solid rgba(0, 212, 255, 0.3);
        color: var(--primary);
        font-size: 20px;
        font-weight: 800;
        margin-bottom: 20px;
    }
    .step-item h3 {
        font-size: 17px;
        font-weight: 700;
        margin-bottom: 8px;
    }
    .step-item p {
        color: var(--text-muted);
        font-size: 14px;
        line-height: 1.7;
    }
    .stats-band {
        background: linear-gradient(135deg, rgba(0, 212, 255, 0.08), rgba(124, 58, 237, 0.1)), url("/assets/images/backpic/back-2.png");
        background-size: cover;
        background-position: center;
        padding: 70px 0;
        border-top: 1px solid rgba(255, 255, 255, 0.05);
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }
    .stats-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 24px;
        text-align: center;
    }
    .stat-item {
        padding: 28px 16px;
        background: rgba(8, 12, 24, 0.55);
        backdrop-filter: blur(8px);
        border: 1px solid rgba(255, 255, 255, 0.08);
        border-radius: var(--radius-lg);
    }
    .stat-item strong {
        display: block;
        font-size: 42px;
        font-weight: 900;
        background: linear-gradient(135deg, #fff, #a5f7ff);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        background-clip: text;
        margin-bottom: 6px;
        letter-spacing: 1px;
    }
    .stat-item span {
        color: var(--text-muted);
        font-size: 14px;
    }
    .faq-section {
        background: var(--bg-deep);
    }
    .faq-list {
        max-width: 800px;
        margin: 0 auto;
        display: flex;
        flex-direction: column;
        gap: 14px;
    }
    .faq-item {
        background: var(--card-bg);
        border: 1px solid var(--border);
        border-radius: 16px;
        overflow: hidden;
        transition: border-color .3s;
    }
    .faq-item.faq-item-open {
        border-color: rgba(0, 212, 255, 0.32);
        box-shadow: 0 0 0 1px rgba(0, 212, 255, 0.1);
    }
    .faq-question {
        width: 100%;
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 16px;
        background: transparent;
        color: var(--text);
        padding: 20px 24px;
        font-size: 16px;
        font-weight: 600;
        text-align: left;
        transition: color .2s;
    }
    .faq-question:hover {
        color: var(--primary);
    }
    .faq-question i {
        color: var(--primary);
        font-size: 14px;
        transition: transform .3s;
        flex-shrink: 0;
    }
    .faq-item.faq-item-open .faq-question i {
        transform: rotate(180deg);
    }
    .faq-answer {
        max-height: 0;
        overflow: hidden;
        transition: max-height .35s ease;
    }
    .faq-item.faq-item-open .faq-answer {
        max-height: 300px;
    }
    .faq-answer p {
        padding: 0 24px 22px;
        color: var(--text-muted);
        font-size: 15px;
        line-height: 1.75;
    }
    .cta-band {
        position: relative;
        padding: 80px 0;
        background-image: linear-gradient(120deg, rgba(8, 12, 24, 0.95), rgba(13, 18, 38, 0.9)), url("/assets/images/backpic/back-3.png");
        background-size: cover;
        background-position: center;
        text-align: center;
    }
    .cta-inner {
        max-width: 680px;
        margin: 0 auto;
        padding: 0 24px;
    }
    .cta-inner h2 {
        font-size: clamp(28px, 4vw, 44px);
        font-weight: 800;
        line-height: 1.3;
        margin-bottom: 16px;
    }
    .cta-inner p {
        color: var(--text-muted);
        font-size: 17px;
        line-height: 1.75;
        margin-bottom: 32px;
    }
    .cta-actions {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 16px;
    }
    .site-footer {
        background: var(--bg-deep);
        border-top: 1px solid rgba(255, 255, 255, 0.05);
        padding: 60px 0 0;
    }
    .footer-grid {
        display: grid;
        grid-template-columns: 1.4fr 1fr 1fr;
        gap: 40px;
        padding-bottom: 40px;
    }
    .footer-brand .logo {
        font-size: 20px;
        margin-bottom: 14px;
    }
    .footer-brand p {
        color: var(--text-muted);
        font-size: 14.5px;
        line-height: 1.75;
        max-width: 340px;
        margin-top: 10px;
    }
    .footer-col h3 {
        font-size: 15px;
        font-weight: 700;
        color: #fff;
        margin-bottom: 18px;
        letter-spacing: 2px;
    }
    .footer-col ul {
        list-style: none;
    }
    .footer-col ul li {
        margin-bottom: 10px;
    }
    .footer-col ul a {
        color: var(--text-muted);
        font-size: 14.5px;
        transition: color .2s, padding-left .2s;
    }
    .footer-col ul a:hover {
        color: var(--primary);
        padding-left: 4px;
    }
    .footer-bottom {
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        justify-content: space-between;
        gap: 12px;
        border-top: 1px solid rgba(255, 255, 255, 0.06);
        padding: 24px 0;
    }
    .footer-bottom p {
        color: var(--text-muted);
        font-size: 14px;
    }
    @media (max-width: 1024px) {
        :root {
            --spacing: 4rem;
        }
        .features-grid,
        .modes-grid {
            grid-template-columns: repeat(2, 1fr);
        }
        .steps {
            grid-template-columns: repeat(2, 1fr);
        }
        .stats-grid {
            grid-template-columns: repeat(2, 1fr);
        }
    }
    @media (max-width: 768px) {
        .header-nav {
            position: fixed;
            top: var(--header-h);
            left: 0;
            right: 0;
            background: rgba(8, 12, 24, 0.97);
            backdrop-filter: blur(20px);
            flex-direction: column;
            align-items: stretch;
            padding: 16px 24px 24px;
            gap: 4px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.07);
            transform: translateY(-120%);
            opacity: 0;
            transition: transform .3s ease, opacity .3s ease;
            pointer-events: none;
        }
        .header-nav.nav-open {
            transform: translateY(0);
            opacity: 1;
            pointer-events: auto;
        }
        .nav-link {
            padding: 14px 16px;
            border-radius: 12px;
        }
        .nav-link.active::after {
            display: none;
        }
        .nav-toggle {
            display: flex;
        }
        .header-actions .btn-sm {
            display: none;
        }
        .hero {
            padding-top: 56px;
        }
        .hero-stats {
            gap: 16px 28px;
        }
        .footer-grid {
            grid-template-columns: 1fr;
            gap: 30px;
        }
        .footer-bottom {
            flex-direction: column;
            text-align: center;
        }
    }
    @media (max-width: 520px) {
        .container {
            padding: 0 18px;
        }
        .features-grid,
        .modes-grid,
        .steps,
        .stats-grid {
            grid-template-columns: 1fr;
        }
        .hero-actions {
            flex-direction: column;
            align-items: stretch;
        }
        .hero-actions .btn {
            width: 100%;
        }
        .section {
            padding: 3rem 0;
        }
        .stat-item strong {
            font-size: 34px;
        }
        .hero-title {
            font-size: 30px;
        }
        .faq-question {
            font-size: 15px;
        }
    }

/* roulang page: category3 */
:root {
  --bg-dark: #070b14;
  --bg-panel: #0c1220;
  --bg-card: #101a2c;
  --bg-deep: #04070e;
  --primary: #00e5ff;
  --primary-dim: rgba(0, 229, 255, 0.12);
  --secondary: #ff2d78;
  --accent: #ffc74a;
  --text-main: #eaeef5;
  --text-sub: #93a1b8;
  --border: rgba(255, 255, 255, 0.08);
  --border-light: rgba(0, 229, 255, 0.25);
  --radius: 16px;
  --radius-md: 12px;
  --shadow: 0 18px 48px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 28px rgba(0, 229, 255, 0.18);
  --transition: all 0.3s ease;
  --container: 1240px;
  --header-h: 76px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--text-main);
  background: var(--bg-dark);
  -webkit-font-smoothing: antialiased;
}

body.no-scroll {
  overflow: hidden;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
}

ul {
  list-style: none;
}

button {
  font-family: inherit;
  border: none;
  background: none;
  cursor: pointer;
  color: inherit;
}

input,
textarea {
  font-family: inherit;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 96px 0;
}

.section-sm {
  padding: 64px 0;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 18px;
  border-radius: 999px;
  background: var(--primary-dim);
  border: 1px solid var(--border-light);
  color: var(--primary);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.02em;
  margin-bottom: 16px;
}

.section-tag i {
  font-size: 13px;
}

.section-title {
  font-size: 38px;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.01em;
  margin-bottom: 16px;
}

.section-title span {
  color: var(--primary);
}

.section-desc {
  font-size: 16px;
  color: var(--text-sub);
  line-height: 1.8;
}

/* ======= Header ======= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(7, 11, 20, 0.82);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
  height: var(--header-h);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  gap: 24px;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 22px;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.01em;
  white-space: nowrap;
  transition: var(--transition);
}

.logo i {
  color: var(--primary);
  font-size: 20px;
  filter: drop-shadow(0 0 8px rgba(0, 229, 255, 0.6));
}

.logo:hover {
  color: var(--primary);
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-sub);
  transition: var(--transition);
  position: relative;
}

.nav-link i {
  font-size: 14px;
  opacity: 0.85;
}

.nav-link:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.04);
}

.nav-link.active {
  color: var(--primary);
  background: var(--primary-dim);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-glow);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  border-radius: 12px;
  transition: var(--transition);
  justify-content: center;
  white-space: nowrap;
}

.btn-sm {
  padding: 10px 20px;
  font-size: 14px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, #00b7d4 100%);
  color: #04121a;
  border: 1px solid rgba(0, 229, 255, 0.4);
  box-shadow: 0 8px 24px rgba(0, 229, 255, 0.22);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(0, 229, 255, 0.35);
  filter: brightness(1.08);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-main);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.18);
  transform: translateY(-2px);
}

.btn-glow {
  background: linear-gradient(135deg, var(--secondary) 0%, #ff6a3d 100%);
  color: #fff;
  border: 1px solid rgba(255, 45, 120, 0.5);
  box-shadow: 0 8px 28px rgba(255, 45, 120, 0.3);
}

.btn-glow:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 36px rgba(255, 45, 120, 0.42);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border: 1px solid var(--border);
  border-radius: 10px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  background: rgba(255, 255, 255, 0.04);
}

.nav-toggle span {
  width: 20px;
  height: 2px;
  background: var(--text-main);
  border-radius: 2px;
  transition: var(--transition);
}

.nav-toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ======= Hero ======= */
.hero {
  position: relative;
  padding: 120px 0 110px;
  background: url('/assets/images/backpic/back-1.webp') center top / cover no-repeat;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(7, 11, 20, 0.7) 0%, rgba(7, 11, 20, 0.88) 70%, var(--bg-dark) 100%);
  z-index: 1;
}

.hero::after {
  content: '';
  position: absolute;
  width: 620px;
  height: 620px;
  border-radius: 50%;
  background: rgba(0, 229, 255, 0.08);
  filter: blur(120px);
  top: -180px;
  right: -120px;
  z-index: 1;
}

.hero .container {
  position: relative;
  z-index: 2;
}

.hero-content {
  max-width: 760px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 20px;
  border-radius: 999px;
  background: rgba(0, 229, 255, 0.1);
  border: 1px solid rgba(0, 229, 255, 0.3);
  color: var(--primary);
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 24px;
  box-shadow: 0 0 24px rgba(0, 229, 255, 0.12);
}

.hero-badge .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(0, 229, 255, 0.5); }
  50% { opacity: 0.7; box-shadow: 0 0 0 8px rgba(0, 229, 255, 0); }
}

.hero h1 {
  font-size: 56px;
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 20px;
}

.hero h1 span {
  background: linear-gradient(120deg, var(--primary) 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-lead {
  font-size: 18px;
  color: rgba(234, 238, 245, 0.75);
  line-height: 1.85;
  margin-bottom: 36px;
  max-width: 620px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  margin-bottom: 48px;
}

.btn-lg {
  padding: 16px 36px;
  font-size: 16px;
  border-radius: 14px;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.hero-stat-chip {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  font-size: 14px;
  color: var(--text-sub);
  backdrop-filter: blur(8px);
}

.hero-stat-chip i {
  color: var(--primary);
}

.hero-stat-chip strong {
  color: var(--text-main);
  font-weight: 700;
}

/* ======= Stats ======= */
.stats-section {
  position: relative;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  padding: 72px 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}

.stat-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 36px 28px;
  text-align: center;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  opacity: 0.4;
  transition: var(--transition);
}

.stat-card:hover {
  border-color: var(--border-light);
  transform: translateY(-6px);
  box-shadow: var(--shadow);
}

.stat-card:hover::before {
  opacity: 1;
}

.stat-icon {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: var(--primary-dim);
  color: var(--primary);
  font-size: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 18px;
}

.stat-number {
  font-size: 44px;
  font-weight: 900;
  line-height: 1.1;
  color: var(--text-main);
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}

.stat-number em {
  font-style: normal;
  color: var(--primary);
}

.stat-label {
  font-size: 15px;
  color: var(--text-sub);
}

/* ======= Promo Grid ======= */
.promo-section {
  background: var(--bg-dark);
  position: relative;
}

.promo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.promo-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.promo-card:hover {
  transform: translateY(-8px);
  border-color: var(--border-light);
  box-shadow: var(--shadow), var(--shadow-glow);
}

.promo-media {
  position: relative;
  height: 200px;
  overflow: hidden;
}

.promo-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.promo-card:hover .promo-media img {
  transform: scale(1.06);
}

.promo-media::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(7, 11, 20, 0.85) 100%);
}

.promo-tag {
  position: absolute;
  top: 16px;
  left: 16px;
  z-index: 2;
  padding: 6px 14px;
  background: rgba(0, 229, 255, 0.9);
  color: #04121a;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  box-shadow: 0 4px 16px rgba(0, 229, 255, 0.3);
}

.promo-body {
  padding: 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.promo-body h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-main);
}

.promo-body p {
  font-size: 15px;
  color: var(--text-sub);
  line-height: 1.7;
  margin-bottom: 18px;
  flex: 1;
}

.promo-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.promo-meta .date {
  font-size: 13px;
  color: var(--text-sub);
}

.promo-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--primary);
  transition: var(--transition);
}

.promo-btn i {
  transition: transform 0.3s ease;
}

.promo-btn:hover {
  color: var(--accent);
}

.promo-btn:hover i {
  transform: translateX(4px);
}

/* ======= Steps ======= */
.steps-section {
  background: var(--bg-panel);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.steps-section::before {
  content: '';
  position: absolute;
  width: 480px;
  height: 480px;
  border-radius: 50%;
  background: rgba(255, 45, 120, 0.06);
  filter: blur(100px);
  bottom: -160px;
  left: -80px;
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
  position: relative;
  z-index: 1;
}

.step-item {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 32px 26px;
  border: 1px solid var(--border);
  transition: var(--transition);
  position: relative;
}

.step-item:hover {
  border-color: var(--border-light);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.step-num {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  font-size: 22px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  box-shadow: 0 8px 20px rgba(0, 229, 255, 0.2);
}

.step-item h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
}

.step-item p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.7;
}

/* ======= Featured ======= */
.featured-section {
  background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
  position: relative;
  padding: 100px 0;
}

.featured-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(7, 11, 20, 0.92) 0%, rgba(7, 11, 20, 0.72) 50%, rgba(7, 11, 20, 0.9) 100%);
}

.featured-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 60px;
  align-items: center;
}

.featured-content .section-tag {
  margin-bottom: 18px;
}

.featured-content h2 {
  font-size: 38px;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 20px;
}

.featured-content h2 span {
  color: var(--accent);
}

.featured-content p {
  color: rgba(234, 238, 245, 0.75);
  font-size: 16px;
  line-height: 1.85;
  margin-bottom: 28px;
}

.feature-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-bottom: 32px;
}

.feature-list li {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
  color: var(--text-main);
}

.feature-list li i {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(255, 199, 74, 0.14);
  color: var(--accent);
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.featured-media {
  border-radius: 20px;
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.5);
  transform: perspective(1000px) rotateY(-4deg);
  transition: var(--transition);
}

.featured-media:hover {
  transform: perspective(1000px) rotateY(0deg);
}

.featured-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ======= Testimonials ======= */
.testimonials-section {
  background: var(--bg-dark);
}

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.testimonial-card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 32px;
  border: 1px solid var(--border);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.testimonial-card:hover {
  border-color: var(--border-light);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.testimonial-stars {
  display: flex;
  gap: 4px;
  color: var(--accent);
  font-size: 14px;
  margin-bottom: 16px;
}

.testimonial-stars i {
  color: var(--accent);
}

.testimonial-text {
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-sub);
  flex: 1;
  margin-bottom: 20px;
}

.testimonial-user {
  display: flex;
  align-items: center;
  gap: 14px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}

.testimonial-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #fff;
  font-weight: 700;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.testimonial-user strong {
  display: block;
  font-size: 15px;
  color: var(--text-main);
}

.testimonial-user span {
  font-size: 13px;
  color: var(--text-sub);
}

/* ======= FAQ ======= */
.faq-section {
  background: var(--bg-panel);
  border-top: 1px solid var(--border);
  position: relative;
}

.faq-wrap {
  max-width: 760px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  transition: var(--transition);
  overflow: hidden;
}

.faq-item:hover {
  border-color: rgba(255, 255, 255, 0.14);
}

.faq-item.open {
  border-color: var(--border-light);
  box-shadow: var(--shadow-glow);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 22px 26px;
  text-align: left;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-main);
  transition: var(--transition);
}

.faq-question:hover {
  color: var(--primary);
}

.faq-icon {
  width: 30px;
  height: 30px;
  border-radius: 8px;
  background: rgba(0, 229, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  transition: transform 0.3s ease, background 0.3s ease, color 0.3s ease;
  flex-shrink: 0;
  color: var(--primary);
}

.faq-item.open .faq-icon {
  transform: rotate(45deg);
  background: var(--primary);
  color: #04121a;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.faq-answer-inner {
  padding: 0 26px 24px;
  font-size: 15px;
  color: var(--text-sub);
  line-height: 1.8;
  border-top: 1px solid var(--border);
  padding-top: 18px;
}

/* ======= CTA ======= */
.cta-section {
  background: var(--bg-dark);
  padding: 110px 0;
  position: relative;
  overflow: hidden;
}

.cta-section::before {
  content: '';
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: rgba(0, 229, 255, 0.07);
  filter: blur(100px);
  top: -200px;
  right: -100px;
}

.cta-section::after {
  content: '';
  position: absolute;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: rgba(255, 45, 120, 0.05);
  filter: blur(90px);
  bottom: -160px;
  left: -80px;
}

.cta-box {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
}

.cta-box h2 {
  font-size: 42px;
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 20px;
}

.cta-box h2 span {
  color: var(--primary);
}

.cta-box p {
  font-size: 17px;
  color: var(--text-sub);
  line-height: 1.8;
  margin-bottom: 36px;
}

.cta-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

/* ======= Footer ======= */
.site-footer {
  background: var(--bg-deep);
  border-top: 1px solid var(--border);
  padding: 72px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
}

.footer-brand .logo {
  margin-bottom: 18px;
  font-size: 22px;
}

.footer-brand p {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.8;
  max-width: 340px;
}

.footer-col h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 18px;
  letter-spacing: 0.02em;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a {
  font-size: 14px;
  color: var(--text-sub);
  transition: var(--transition);
}

.footer-col ul li a:hover {
  color: var(--primary);
  padding-left: 4px;
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-bottom p {
  font-size: 14px;
  color: var(--text-sub);
}

/* ======= Responsive ======= */
@media (max-width: 1024px) {
  .hero h1 {
    font-size: 46px;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .promo-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .featured-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .featured-media {
    max-width: 640px;
  }

  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 860px) {
  .nav-toggle {
    display: flex;
  }

  .header-nav {
    display: none;
    position: absolute;
    top: var(--header-h);
    left: 0;
    right: 0;
    background: rgba(7, 11, 20, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: stretch;
    padding: 20px;
    gap: 8px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
  }

  .header-nav.open {
    display: flex;
  }

  .nav-link {
    padding: 14px 18px;
    font-size: 16px;
  }

  .header-actions .btn-sm {
    padding: 10px 16px;
    font-size: 13px;
  }
}

@media (max-width: 640px) {
  .section {
    padding: 64px 0;
  }

  .section-title {
    font-size: 28px;
  }

  .container {
    padding: 0 18px;
  }

  .hero {
    padding: 80px 0 70px;
  }

  .hero h1 {
    font-size: 34px;
  }

  .hero-lead {
    font-size: 16px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .hero-stats {
    flex-wrap: wrap;
  }

  .stats-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .promo-grid {
    grid-template-columns: 1fr;
  }

  .steps-grid {
    grid-template-columns: 1fr;
  }

  .testimonials-grid {
    grid-template-columns: 1fr;
  }

  .featured-section {
    padding: 64px 0;
  }

  .featured-content h2 {
    font-size: 30px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .logo {
    font-size: 19px;
  }

  .header-actions .btn-sm {
    display: none;
  }
}

@media (max-width: 480px) {
  .cta-box h2 {
    font-size: 30px;
  }

  .hero-stat-chip {
    font-size: 13px;
    padding: 8px 14px;
  }

  .featured-content p,
  .feature-list li {
    font-size: 14px;
  }
}

/* ======= Focus ======= */
a:focus-visible,
button:focus-visible {
  outline: 3px solid rgba(0, 229, 255, 0.5);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}