/* roulang page: index */
:root {
    --primary: #1d34c1;
    --primary-dark: #171f4e;
    --primary-light: #3b63f1;
    --accent: #f59e0b;
    --accent-light: #fbbf24;
    --bg: #f7f8fc;
    --white: #ffffff;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --radius-inner: 14px;
    --radius-card: 20px;
    --shadow-card: 0 4px 24px rgba(23,31,78,0.06);
    --shadow-hover: 0 16px 40px rgba(23,31,78,0.12);
    --container: 1200px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: none; }

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

/* ============ Topbar ============ */
.topbar {
    background: var(--primary-dark);
    color: rgba(255,255,255,0.75);
    font-size: 12px;
    padding: 8px 0;
    letter-spacing: 0.2px;
}
.topbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
}
.topbar .dot {
    display: inline-block;
    width: 6px;
    height: 6px;
    background: var(--accent-light);
    border-radius: 50%;
    margin-right: 6px;
    vertical-align: 1px;
    animation: pulse 1.8s infinite;
}
@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.55; transform: scale(0.8); }
}

/* ============ Header / Nav ============ */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--border);
    transition: box-shadow .3s ease;
}
.site-header.scrolled {
    box-shadow: var(--shadow-nav, 0 2px 20px rgba(23,31,78,0.06));
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 68px;
    gap: 24px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}
.logo-icon {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 16px;
    box-shadow: 0 6px 16px rgba(37,68,224,0.25);
}
.logo-text {
    font-size: 19px;
    font-weight: 800;
    color: var(--primary-dark);
    letter-spacing: -0.3px;
    white-space: nowrap;
}
.nav-list {
    display: flex;
    align-items: center;
    gap: 4px;
    list-style: none;
}
.nav-link {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 9px 16px;
    border-radius: 999px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text);
    transition: all .25s ease;
}
.nav-link:hover {
    background: var(--bg);
    color: var(--primary);
}
.nav-link.active {
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    color: #fff;
    font-weight: 600;
    box-shadow: 0 6px 18px rgba(37,68,224,0.28);
}
.nav-cta {
    display: flex;
    align-items: center;
    gap: 10px;
}
.header-search {
    position: relative;
    display: none;
}
@media (min-width: 1024px) {
    .header-search { display: block; }
}
.header-search input {
    width: 200px;
    height: 38px;
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 0 36px 0 16px;
    font-size: 13px;
    background: var(--bg);
    outline: none;
    transition: all .25s ease;
}
.header-search input:focus {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(59,99,241,0.12);
    background: #fff;
    width: 240px;
}
.header-search .fa-magnifying-glass {
    position: absolute;
    right: 13px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 13px;
    color: var(--text-muted);
    pointer-events: none;
}
.mobile-toggle {
    display: none;
    width: 42px;
    height: 42px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: #fff;
    align-items: center;
    justify-content: center;
    font-size: 17px;
    color: var(--text);
    transition: all .25s ease;
}
.mobile-toggle:hover {
    border-color: var(--primary-light);
    color: var(--primary);
}

/* 移动端导航 */
.mobile-nav {
    display: none;
    position: fixed;
    z-index: 99;
    top: 68px;
    left: 0;
    right: 0;
    background: #fff;
    border-bottom: 1px solid var(--border);
    padding: 20px 24px;
    box-shadow: 0 20px 40px rgba(23,31,78,0.1);
    animation: slideDown .3s ease;
}
@keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
}
.mobile-nav.open { display: block; }
.mobile-nav a {
    display: block;
    padding: 14px 16px;
    border-radius: 14px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text);
    transition: all .2s ease;
}
.mobile-nav a:hover, .mobile-nav a.active { background: var(--bg); color: var(--primary); }
.mobile-nav a.active { font-weight: 600; background: linear-gradient(135deg, rgba(59,99,241,0.1), rgba(29,52,193,0.06)); }

/* ============ Hero ============ */
.hero {
    position: relative;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    padding: 120px 0 140px;
    isolation: isolate;
}
.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(120deg, rgba(23,31,78,0.90) 0%, rgba(23,31,78,0.72) 45%, rgba(37,68,224,0.55) 100%);
    z-index: -0;
}
.hero-content {
    position: relative;
    z-index: 1;
    max-width: 680px;
}
.hero .hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(255,255,255,0.12);
    border: 1px solid rgba(255,255,255,0.18);
    border-radius: 999px;
    padding: 8px 18px;
    color: rgba(255,255,255,0.9);
    font-size: 13px;
    font-weight: 500;
    backdrop-filter: blur(6px);
    margin-bottom: 28px;
}
.hero h1 {
    font-size: clamp(2.2rem, 4.5vw, 3.5rem);
    font-weight: 800;
    color: #fff;
    line-height: 1.18;
    letter-spacing: -1px;
    margin-bottom: 20px;
}
.hero h1 .accent-text {
    color: var(--accent-light);
    position: relative;
}
.hero p {
    font-size: 16px;
    line-height: 1.8;
    color: rgba(255,255,255,0.88);
    margin-bottom: 36px;
    max-width: 560px;
}
.hero-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
}
.btn {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    padding: 13px 26px;
    border-radius: 999px;
    font-size: 14px;
    font-weight: 600;
    transition: all .28s ease;
    border: 1px solid transparent;
}
.btn-primary {
    background: linear-gradient(135deg, var(--accent-light), var(--accent));
    color: var(--primary-dark);
    box-shadow: 0 8px 24px rgba(245,158,11,0.32);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 30px rgba(245,158,11,0.42);
}
.btn-ghost {
    background: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.28);
    color: #fff;
    backdrop-filter: blur(6px);
}
.btn-ghost:hover {
    background: rgba(255,255,255,0.22);
    transform: translateY(-2px);
}
.hero-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 32px;
    margin-top: 54px;
}
.hero-stats .stat {
    display: flex;
    align-items: baseline;
    gap: 8px;
}
.hero-stats .number {
    font-size: 28px;
    font-weight: 800;
    color: #fff;
    letter-spacing: -0.5px;
}
.hero-stats .label {
    font-size: 13px;
    color: rgba(255,255,255,0.68);
}

/* ============ Section ============ */
.section {
    padding: 84px 0;
}
.section-alt {
    background: #fff;
}
.section-head {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 52px;
}
.section-head .eyebrow {
    display: inline-block;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--primary-light);
    margin-bottom: 12px;
    background: rgba(59,99,241,0.08);
    padding: 5px 14px;
    border-radius: 999px;
}
.section-head h2 {
    font-size: clamp(1.6rem, 3vw, 2.3rem);
    font-weight: 800;
    color: var(--primary-dark);
    letter-spacing: -0.5px;
    line-height: 1.3;
    margin-bottom: 12px;
}
.section-head p {
    color: var(--text-muted);
    font-size: 15px;
    line-height: 1.7;
}

/* ============ Feature Cards ============ */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.feature-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-card);
    padding: 30px 24px;
    transition: all .35s cubic-bezier(.4,0,.2,1);
    position: relative;
    overflow: hidden;
}
.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-light), var(--accent-light));
    opacity: 0;
    transition: opacity .3s ease;
}
.feature-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-6px);
    border-color: transparent;
}
.feature-card:hover::before { opacity: 1; }
.feature-icon {
    width: 54px;
    height: 54px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    margin-bottom: 20px;
    background: linear-gradient(135deg, rgba(59,99,241,0.1), rgba(59,99,241,0.04));
    color: var(--primary);
    transition: all .35s ease;
}
.feature-card:hover .feature-icon {
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    color: #fff;
    box-shadow: 0 8px 20px rgba(37,68,224,0.28);
}
.feature-card h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 10px;
}
.feature-card p {
    font-size: 13.5px;
    color: var(--text-muted);
    line-height: 1.7;
}

/* ============ Category ============ */
.category-section {
    background: linear-gradient(180deg, var(--bg) 0%, #eef1f8 100%);
}
.category-card {
    display: grid;
    grid-template-columns: 1.05fr 1fr;
    align-items: center;
    background: var(--white);
    border-radius: calc(var(--radius-card) + 8px);
    overflow: hidden;
    box-shadow: var(--shadow-card);
    border: 1px solid var(--border);
    transition: all .4s ease;
}
.category-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-4px);
}
.category-cover {
    position: relative;
    overflow: hidden;
    height: 100%;
    min-height: 360px;
}
.category-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .6s ease;
}
.category-card:hover .category-cover img {
    transform: scale(1.04);
}
.category-cover::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent 50%, rgba(255,255,255,1) 100%);
}
.category-body {
    padding: 44px 40px;
}
.category-body .tag-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(59,99,241,0.08);
    color: var(--primary);
    font-size: 12px;
    font-weight: 600;
    padding: 6px 14px;
    border-radius: 999px;
    margin-bottom: 16px;
}
.category-body h3 {
    font-size: 24px;
    font-weight: 800;
    color: var(--primary-dark);
    margin-bottom: 12px;
    letter-spacing: -0.4px;
}
.category-body p {
    font-size: 14.5px;
    color: var(--text-muted);
    line-height: 1.8;
    margin-bottom: 24px;
}
.btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 999px;
    border: 1.5px solid var(--primary);
    color: var(--primary);
    font-size: 14px;
    font-weight: 600;
    transition: all .3s ease;
    background: transparent;
}
.btn-outline:hover {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 8px 24px rgba(37,68,224,0.28);
    transform: translateY(-2px);
}

/* ============ News List ============ */
.news-list {
    display: flex;
    flex-direction: column;
    gap: 18px;
    max-width: 880px;
    margin: 0 auto;
}
.news-item {
    display: flex;
    gap: 22px;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-card);
    padding: 22px;
    transition: all .35s ease;
    cursor: pointer;
    overflow: hidden;
    position: relative;
}
.news-item:hover {
    box-shadow: var(--shadow-hover);
    transform: translateX(6px);
    border-color: transparent;
}
.news-thumb {
    flex-shrink: 0;
    width: 160px;
    height: 140px;
    border-radius: var(--radius-inner);
    overflow: hidden;
    background: #eef1f8;
}
.news-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .5s ease;
}
.news-item:hover .news-thumb img {
    transform: scale(1.06);
}
.news-body {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.news-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}
.news-tag {
    display: inline-flex;
    align-items: center;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    color: #fff;
    font-size: 11px;
    font-weight: 600;
    padding: 3px 11px;
    border-radius: 999px;
    letter-spacing: 0.3px;
}
.news-date {
    font-size: 12px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 5px;
}
.news-body h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--text);
    line-height: 1.45;
    margin-bottom: 8px;
    transition: color .2s ease;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.news-item:hover .news-body h3 {
    color: var(--primary);
}
.news-body p {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.7;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.empty-tip {
    text-align: center;
    padding: 60px 20px;
    background: var(--white);
    border: 1px dashed var(--border);
    border-radius: var(--radius-card);
    color: var(--text-muted);
    font-size: 15px;
}
.empty-tip i {
    display: block;
    font-size: 30px;
    margin-bottom: 14px;
    color: #cbd5e1;
}

/* ============ Stats ============ */
.stats-section {
    position: relative;
    background-size: cover;
    background-position: center;
    background-image: url('/assets/images/backpic/back-2.png');
    padding: 88px 0;
    isolation: isolate;
}
.stats-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(120deg, rgba(23,31,78,0.94), rgba(37,68,224,0.84));
    z-index: -1;
}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}
.stat-card {
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.14);
    border-radius: var(--radius-card);
    padding: 32px 24px;
    text-align: center;
    backdrop-filter: blur(8px);
    transition: all .35s ease;
}
.stat-card:hover {
    background: rgba(255,255,255,0.15);
    transform: translateY(-4px);
}
.stat-card .num {
    font-size: 36px;
    font-weight: 800;
    color: var(--accent-light);
    line-height: 1.2;
    letter-spacing: -1px;
}
.stat-card .label {
    font-size: 13px;
    color: rgba(255,255,255,0.8);
    margin-top: 6px;
}

/* ============ Steps ============ */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    counter-reset: step;
}
.step-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-card);
    padding: 34px 26px;
    position: relative;
    transition: all .35s ease;
    overflow: hidden;
}
.step-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(180deg, var(--primary-light), var(--accent-light));
    opacity: 0;
    transition: opacity .3s ease;
}
.step-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-6px);
}
.step-card:hover::before { opacity: 1; }
.step-number {
    font-size: 42px;
    font-weight: 800;
    color: #eef1f8;
    line-height: 1;
    margin-bottom: 16px;
    letter-spacing: -2px;
}
.step-card h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
}
.step-card p {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.7;
}

/* ============ FAQ ============ */
.faq-list {
    max-width: 780px;
    margin: 0 auto;
}
.faq-item {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-inner);
    margin-bottom: 14px;
    overflow: hidden;
    transition: all .3s ease;
}
.faq-item:hover {
    border-color: rgba(59,99,241,0.3);
}
.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 20px 24px;
    text-align: left;
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
    background: transparent;
    transition: color .2s ease;
}
.faq-question:hover { color: var(--primary); }
.faq-question .icon {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    color: var(--primary);
    transition: all .3s ease;
    flex-shrink: 0;
}
.faq-item.active .faq-question .icon {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
    transform: rotate(180deg);
}
.faq-answer {
    max-height: 0;
    overflow: hidden;
    padding: 0 24px;
    transition: all .4s cubic-bezier(.4,0,.2,1);
    color: var(--text-muted);
    font-size: 14px;
    line-height: 1.8;
}
.faq-item.active .faq-answer {
    max-height: 300px;
    padding: 0 24px 22px;
    border-top: 1px dashed var(--border);
    padding-top: 16px;
}

/* ============ CTA ============ */
.cta-section {
    padding: 80px 0;
    background-size: cover;
    background-position: center;
    background-image: url('/assets/images/backpic/back-3.png');
    position: relative;
    isolation: isolate;
}
.cta-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(23,31,78,0.88);
    z-index: -1;
}
.cta-card {
    text-align: center;
    max-width: 640px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}
.cta-card h2 {
    font-size: clamp(1.7rem, 3vw, 2.5rem);
    font-weight: 800;
    color: #fff;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}
.cta-card p {
    color: rgba(255,255,255,0.85);
    font-size: 15px;
    line-height: 1.8;
    margin-bottom: 32px;
}

/* ============ Footer ============ */
.site-footer {
    background: var(--primary-dark);
    color: rgba(255,255,255,0.7);
    padding-top: 60px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 44px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-brand .logo-text {
    color: #fff;
    font-size: 20px;
}
.footer-brand p {
    font-size: 13px;
    line-height: 1.8;
    margin-top: 16px;
    max-width: 340px;
}
.footer-title {
    font-size: 14px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 18px;
    letter-spacing: 0.5px;
}
.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.footer-links a {
    font-size: 13.5px;
    color: rgba(255,255,255,0.65);
    transition: all .2s ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.footer-links a:hover {
    color: var(--accent-light);
    padding-left: 4px;
}
.footer-bottom {
    padding: 22px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 12.5px;
    color: rgba(255,255,255,0.45);
}

/* ============ Responsive ============ */
@media (max-width: 1024px) {
    .container { padding: 0 20px; }
    .nav-list { display: none; }
    .mobile-toggle { display: flex; }
    .feature-grid { grid-template-columns: repeat(2, 1fr); }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .steps-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .category-card { grid-template-columns: 1fr; }
    .category-cover { min-height: 300px; order: -1; }
    .category-cover::after { display: none; }
    .category-body { padding: 32px 28px; }
}

@media (max-width: 768px) {
    .section { padding: 64px 0; }
    .hero { padding: 90px 0 110px; }
    .hero h1 { font-size: 2rem; }
    .news-item {
        flex-direction: column;
        padding: 18px;
    }
    .news-thumb {
        width: 100%;
        height: 180px;
    }
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    .topbar .hidden-sm { display: none; }
}

@media (max-width: 520px) {
    .container { padding: 0 16px; }
    .feature-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: 1fr 1fr; gap: 14px; }
    .stat-card { padding: 24px 16px; }
    .stat-card .num { font-size: 28px; }
    .steps-grid { grid-template-columns: 1fr; }
    .hero-buttons { flex-direction: column; width: 100%; }
    .hero-buttons .btn { width: 100%; justify-content: center; }
    .hero-stats { gap: 18px; margin-top: 40px; }
    .logo-text { font-size: 17px; }
    .header-inner { height: 60px; }
    .mobile-nav { top: 60px; }
    .footer-bottom { flex-direction: column; text-align: center; }
}

/* ============ Utilities ============ */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity .7s ease, transform .7s ease;
}
.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* roulang page: category1 */
:root {
    --primary: #0f766e;
    --primary-dark: #115e59;
    --primary-light: #14b8a6;
    --accent: #f59e0b;
    --ink: #0f172a;
    --muted: #64748b;
    --soft: #f0fdfa;
    --border: #e2e8f0;
    --radius: 1rem;
    --radius-sm: 0.5rem;
    --shadow-sm: 0 1px 3px rgba(15,23,42,0.06), 0 1px 2px rgba(15,23,42,0.04);
    --shadow-md: 0 4px 20px rgba(15,23,42,0.08), 0 2px 6px rgba(15,23,42,0.04);
    --shadow-lg: 0 12px 40px rgba(15,23,42,0.12), 0 4px 12px rgba(15,23,42,0.06);
    --spacing-section: 5rem;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
    font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
    color: var(--ink);
    background: #ffffff;
    line-height: 1.7;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; transition: all .25s ease; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, select, textarea { font-family: inherit; outline: none; }
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 1.25rem; }

/* 设计变量与补充样式 */
.logo {
    display: inline-flex; align-items: center; gap: .65rem;
    font-weight: 800; font-size: 1.25rem; letter-spacing: .01em;
}
.logo-icon {
    display: inline-flex; align-items: center; justify-content: center;
    width: 2.4rem; height: 2.4rem; border-radius: .8rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: #fff; font-size: 1.1rem;
    box-shadow: 0 4px 12px rgba(15,118,110,.35);
}
.logo-text { color: var(--ink); white-space: nowrap; }
.logo-text:hover { color: var(--primary); }

.nav-wrap {
    background: rgba(255,255,255,.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(226,232,240,.7);
    position: sticky; top: 0; z-index: 100;
    transition: box-shadow .3s ease;
}
.nav-wrap.scrolled { box-shadow: var(--shadow-md); }
.nav-list { display: flex; align-items: center; gap: .35rem; }
.nav-link {
    display: flex; align-items: center; gap: .45rem;
    padding: .55rem 1.05rem; border-radius: 999px;
    font-weight: 600; font-size: .95rem; color: var(--muted);
    transition: all .25s ease;
}
.nav-link:hover { color: var(--primary); background: rgba(15,118,110,.08); }
.nav-link.active { color: #fff; background: var(--primary); box-shadow: 0 4px 14px rgba(15,118,110,.35); }
.nav-link i { font-size: .8rem; }
.nav-search {
    display: flex; align-items: center; gap: .5rem;
    background: #f1f5f9; border: 1px solid transparent;
    border-radius: 999px; padding: .45rem .8rem; width: 220px;
    transition: all .3s ease;
}
.nav-search:focus-within { border-color: var(--primary-light); background: #fff; box-shadow: 0 0 0 3px rgba(20,184,166,.15); }
.nav-search input { border: none; background: transparent; width: 100%; font-size: .9rem; color: var(--ink); }
.nav-search input::placeholder { color: #94a3b8; }
.nav-search i { color: #94a3b8; font-size: .85rem; }
.mobile-toggle {
    display: none; width: 2.5rem; height: 2.5rem; border-radius: .6rem;
    background: var(--soft); color: var(--primary); font-size: 1rem;
    align-items: center; justify-content: center;
}
.mobile-menu {
    display: none; padding: 1rem 1.25rem 1.25rem;
    background: #fff; border-top: 1px solid var(--border);
}
.mobile-menu.open { display: block; animation: fadeIn .25s ease; }
.mobile-menu .nav-link {
    border-radius: .75rem; padding: .75rem 1rem; margin-bottom: .35rem;
}
@keyframes fadeIn { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: translateY(0); } }

/* Hero/Banner */
.category-hero {
    position: relative;
    background-image: linear-gradient(135deg, rgba(15,23,42,.88) 0%, rgba(15,118,110,.82) 55%, rgba(20,184,166,.72) 100%), url('/assets/images/backpic/back-2.png');
    background-size: cover; background-position: center;
    padding: 5.5rem 0 5rem; color: #fff;
    overflow: hidden;
}
.category-hero::after {
    content: ''; position: absolute; right: -120px; top: -120px;
    width: 360px; height: 360px; border-radius: 50%;
    background: rgba(255,255,255,.06); pointer-events: none;
}
.category-hero::before {
    content: ''; position: absolute; left: 12%; bottom: -80px;
    width: 220px; height: 220px; border-radius: 50%;
    background: rgba(245,158,11,.12); pointer-events: none;
}
.hero-badge {
    display: inline-flex; align-items: center; gap: .5rem;
    background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.25);
    border-radius: 999px; padding: .4rem 1rem; font-size: .85rem; font-weight: 500;
    backdrop-filter: blur(6px);
}
.hero-badge i { color: #fbbf24; }

/* Section spacing */
.section { padding: var(--spacing-section) 0; }
.section-alt { background: #f8fafc; }
.section-soft { background: var(--soft); }
.section-head { margin-bottom: 2.75rem; }
.section-tag {
    display: inline-flex; align-items: center; gap: .4rem;
    color: var(--primary); font-weight: 700; font-size: .85rem;
    letter-spacing: .12em; text-transform: uppercase;
    margin-bottom: .75rem; background: rgba(15,118,110,.08);
    padding: .35rem 1rem; border-radius: 999px;
}
.section-title { font-size: clamp(1.75rem, 3vw, 2.5rem); font-weight: 800; line-height: 1.25; letter-spacing: -.02em; }
.section-desc { color: var(--muted); margin-top: .85rem; font-size: 1.05rem; max-width: 720px; }

/* Cards */
.card {
    background: #fff; border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
    transition: all .35s ease;
    overflow: hidden;
}
.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(15,118,110,.3);
}
.card-img { position: relative; overflow: hidden; aspect-ratio: 16/10; }
.card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .6s ease; }
.card:hover .card-img img { transform: scale(1.05); }
.card-body { padding: 1.5rem; }
.card-title { font-size: 1.15rem; font-weight: 700; line-height: 1.45; margin-bottom: .5rem; }

/* Badge / Tag */
.tag {
    display: inline-block; padding: .25rem .75rem;
    background: var(--soft); color: var(--primary);
    border-radius: 999px; font-size: .8rem; font-weight: 600;
}
.tag-hot { background: #fef3c7; color: #b45309; }
.tag-new { background: #dcfce7; color: #166534; }
.badge-hot {
    position: absolute; top: 12px; left: 12px; z-index: 2;
    background: rgba(245,158,11,.92); color: #fff;
    padding: .25rem .7rem; border-radius: 999px;
    font-size: .75rem; font-weight: 700; letter-spacing: .04em;
    box-shadow: 0 2px 8px rgba(0,0,0,.2);
}

/* Stat blocks */
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
.stat-card {
    background: #fff; border-radius: var(--radius);
    border: 1px solid var(--border); box-shadow: var(--shadow-sm);
    padding: 2rem 1.5rem; text-align: center;
    transition: all .3s ease;
}
.stat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: rgba(15,118,110,.25); }
.stat-number { font-size: 2.25rem; font-weight: 800; color: var(--primary); line-height: 1.2; }
.stat-label { color: var(--muted); font-size: .92rem; margin-top: .4rem; font-weight: 500; }

/* Steps */
.steps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; counter-reset: step; }
.step-card {
    background: #fff; border-radius: var(--radius);
    border: 1px solid var(--border); padding: 2rem 1.5rem;
    position: relative; transition: all .3s ease;
}
.step-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.step-card::before {
    counter-increment: step; content: counter(step, decimal-leading-zero);
    font-size: 2.8rem; font-weight: 800; color: rgba(15,118,110,.14);
    position: absolute; top: 1.25rem; right: 1.5rem; line-height: 1;
}
.step-icon {
    width: 3rem; height: 3rem; border-radius: .85rem;
    background: var(--soft); color: var(--primary);
    display: flex; align-items: center; justify-content: center;
    font-size: 1.2rem; margin-bottom: 1.25rem;
}

/* Feature checklist */
.feature-list { display: flex; flex-direction: column; gap: 1rem; }
.feature-item {
    display: flex; gap: 1rem; padding: 1.1rem 1.25rem;
    background: #fff; border-radius: .85rem;
    border: 1px solid var(--border); transition: all .25s ease;
}
.feature-item:hover { border-color: rgba(15,118,110,.3); box-shadow: var(--shadow-sm); }
.feature-icon {
    flex-shrink: 0; width: 2.3rem; height: 2.3rem; border-radius: .65rem;
    display: flex; align-items: center; justify-content: center;
    background: var(--soft); color: var(--primary); font-size: .95rem;
}

/* FAQ */
.faq-item {
    background: #fff; border: 1px solid var(--border);
    border-radius: 1rem; margin-bottom: .9rem; overflow: hidden;
    transition: all .25s ease;
}
.faq-item:hover { border-color: rgba(15,118,110,.3); }
.faq-question {
    padding: 1.15rem 1.5rem; font-weight: 700; font-size: 1rem;
    display: flex; justify-content: space-between; align-items: center; gap: 1rem;
    cursor: pointer; user-select: none; background: #fff;
    transition: background .25s ease;
}
.faq-question:hover { background: var(--soft); }
.faq-question i { color: var(--primary); font-size: .85rem; transition: transform .3s ease; }
.faq-item.active .faq-question i { transform: rotate(45deg); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height .35s ease; }
.faq-answer p { padding: 0 1.5rem 1.4rem; color: var(--muted); font-size: .95rem; line-height: 1.8; }

/* CTA */
.cta-section {
    position: relative;
    background-image: linear-gradient(120deg, rgba(15,23,42,.92) 0%, rgba(15,118,110,.88) 60%, rgba(20,184,166,.75) 100%), url('/assets/images/backpic/back-1.png');
    background-size: cover; background-position: center;
    padding: 4.5rem 0; border-radius: 1.5rem;
    color: #fff; text-align: center;
    overflow: hidden;
}
.cta-section::before {
    content: ''; position: absolute; top: -80px; right: -60px;
    width: 220px; height: 220px; border-radius: 50%;
    background: rgba(245,158,11,.15);
}
.cta-section::after {
    content: ''; position: absolute; bottom: -100px; left: 20%;
    width: 260px; height: 260px; border-radius: 50%;
    background: rgba(255,255,255,.05);
}

/* CTA button */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
    border-radius: 999px; font-weight: 700; font-size: .95rem;
    padding: .8rem 1.75rem; transition: all .3s ease;
    border: 2px solid transparent;
}
.btn-primary {
    background: var(--primary); color: #fff;
    box-shadow: 0 4px 16px rgba(15,118,110,.35);
}
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(15,118,110,.45); }
.btn-light {
    background: #fff; color: var(--primary-dark);
    box-shadow: 0 4px 16px rgba(0,0,0,.15);
}
.btn-light:hover { background: #f0fdfa; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,.2); }
.btn-outline-light {
    background: transparent; color: #fff;
    border-color: rgba(255,255,255,.55);
}
.btn-outline-light:hover { background: rgba(255,255,255,.12); border-color: #fff; transform: translateY(-2px); }
.btn:focus-visible { outline: 3px solid rgba(245,158,11,.6); outline-offset: 2px; }

/* Footer */
.site-footer {
    background: #0f172a; color: #94a3b8;
    padding: 4rem 0 0; margin-top: 4rem;
}
.footer-grid {
    display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 3rem;
    padding-bottom: 2.5rem; border-bottom: 1px solid rgba(148,163,184,.15);
}
.footer-brand .logo-text { color: #fff; }
.footer-brand .logo-text:hover { color: var(--primary-light); }
.footer-brand p { margin-top: 1.1rem; font-size: .92rem; line-height: 1.8; max-width: 360px; }
.footer-title {
    color: #fff; font-weight: 700; font-size: 1rem;
    margin-bottom: 1.25rem; position: relative; padding-bottom: .6rem;
}
.footer-title::after {
    content: ''; position: absolute; bottom: 0; left: 0;
    width: 28px; height: 3px; border-radius: 2px;
    background: var(--primary-light);
}
.footer-links { list-style: none; display: flex; flex-direction: column; gap: .6rem; }
.footer-links a { color: #94a3b8; font-size: .92rem; display: inline-flex; align-items: center; gap: .4rem; }
.footer-links a i { font-size: .7rem; color: var(--primary-light); }
.footer-links a:hover { color: var(--primary-light); padding-left: 4px; }
.footer-bottom {
    display: flex; justify-content: space-between; align-items: center;
    padding: 1.4rem 0; font-size: .85rem;
    color: #64748b; flex-wrap: wrap; gap: .5rem;
}
.footer-bottom span:last-child { letter-spacing: .08em; }

/* FAQ toggle */
.faq-item.active .faq-answer { max-height: 400px; }

/* 视频按钮悬浮条 */
.play-btn {
    width: 3.2rem; height: 3.2rem; border-radius: 50%;
    background: rgba(255,255,255,.18); border: 2px solid rgba(255,255,255,.6);
    display: flex; align-items: center; justify-content: center;
    backdrop-filter: blur(4px); transition: all .3s ease;
}
.play-btn:hover { background: var(--primary); border-color: var(--primary); transform: scale(1.08); }

/* Responsive */
@media (max-width: 1024px) {
    :root { --spacing-section: 4rem; }
    .stat-grid { grid-template-columns: repeat(2, 1fr); }
    .steps-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .nav-search { width: 170px; }
}
@media (max-width: 768px) {
    .container { padding: 0 1rem; }
    .nav-search { display: none; }
    .nav-list { display: none; }
    .mobile-toggle { display: flex; }
    .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
    .category-hero { padding: 4rem 0 3.5rem; }
    .section { --spacing-section: 3.25rem; }
    .stat-grid { gap: 1rem; }
    .stat-card { padding: 1.5rem 1rem; }
    .stat-number { font-size: 1.8rem; }
    .footer-bottom { flex-direction: column; text-align: center; }
}
@media (max-width: 520px) {
    body { font-size: 15px; }
    .steps-grid { grid-template-columns: 1fr; }
    .btn { width: 100%; }
    .section-title { font-size: 1.5rem; }
    .category-hero { padding: 3.25rem 0 3rem; }
    .footer-grid { grid-template-columns: 1fr; }
    .stat-grid { grid-template-columns: 1fr 1fr; }
}

/* roulang page: article */
:root {
    --brand-600: #2563eb;
    --brand-700: #1d4ed8;
    --brand-900: #1e3a5f;
    --accent: #f59e0b;
    --bg-body: #f0f4f8;
    --bg-card: #ffffff;
    --text-main: #0f172a;
    --text-sub: #64748b;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --radius-xl: 20px;
    --radius-lg: 14px;
    --radius-md: 10px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 4px 12px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08), 0 12px 32px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.10), 0 24px 64px rgba(0, 0, 0, 0.08);
    --header-h: 72px;
  }

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

  html {
    scroll-behavior: smooth;
  }

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

  a {
    text-decoration: none;
    color: inherit;
    transition: color .2s ease;
  }

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

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

  input {
    font-family: inherit;
    outline: none;
    border: none;
  }

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

  /* ===== 顶部吸顶导航 ===== */
  .site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 1px 20px rgba(0, 0, 0, 0.04);
  }

  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-h);
    gap: 20px;
  }

  .logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
  }

  .logo-icon {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--brand-600), var(--brand-900));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 18px;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
  }

  .logo-text {
    font-size: 20px;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: var(--text-main);
    background: linear-gradient(120deg, var(--brand-900), var(--brand-600));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .nav-list {
    display: flex;
    align-items: center;
    gap: 6px;
    flex: 1;
    justify-content: center;
  }

  .nav-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 999px;
    font-size: 15px;
    font-weight: 600;
    color: var(--text-sub);
    transition: all .25s ease;
  }

  .nav-link:hover {
    color: var(--brand-600);
    background: var(--brand-50);
  }

  .nav-link.active {
    color: #fff;
    background: var(--brand-600);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
  }

  .nav-link.active:hover {
    color: #fff;
    background: var(--brand-700);
  }

  .header-actions {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-shrink: 0;
  }

  .search-box {
    display: flex;
    align-items: center;
    background: var(--bg-body);
    border: 1px solid var(--border);
    border-radius: 999px;
    padding: 6px 8px 6px 18px;
    transition: all .3s ease;
    width: 220px;
  }

  .search-box:focus-within {
    border-color: var(--brand-600);
    background: #fff;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
  }

  .search-box input {
    flex: 1;
    background: transparent;
    font-size: 14px;
    color: var(--text-main);
    min-width: 0;
  }

  .search-box input::placeholder {
    color: var(--text-muted);
  }

  .search-box button {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--brand-600);
    color: #fff;
    font-size: 13px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background .2s ease;
  }

  .search-box button:hover {
    background: var(--brand-700);
  }

  .menu-toggle {
    display: none;
    width: 42px;
    height: 42px;
    border-radius: 12px;
    background: var(--bg-body);
    border: 1px solid var(--border);
    color: var(--text-main);
    font-size: 18px;
    align-items: center;
    justify-content: center;
  }

  .menu-toggle:hover {
    background: var(--brand-50);
  }

  .mobile-menu {
    display: none;
    background: #fff;
    border-bottom: 1px solid var(--border);
    padding: 12px 20px;
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.06);
  }

  .mobile-menu.open {
    display: block;
  }

  .mobile-nav-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 14px 16px;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-sub);
  }

  .mobile-nav-link:hover {
    background: var(--bg-body);
    color: var(--brand-600);
  }

  .mobile-nav-link.active {
    color: var(--brand-600);
    background: var(--brand-50);
  }

  /* ===== 面包屑 ===== */
  .breadcrumb {
    padding: 20px 0;
    font-size: 14px;
    color: var(--text-muted);
  }

  .breadcrumb a {
    color: var(--text-sub);
  }

  .breadcrumb a:hover {
    color: var(--brand-600);
  }

  .breadcrumb .sep {
    margin: 0 8px;
    color: var(--border);
  }

  .breadcrumb .current {
    color: var(--text-main);
    font-weight: 600;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 260px;
    display: inline-block;
    vertical-align: bottom;
  }

  /* ===== 文章布局 ===== */
  .article-layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 360px;
    gap: 32px;
    align-items: start;
    padding-bottom: 48px;
  }

  .article-main {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: box-shadow .3s ease;
  }

  .article-main:hover {
    box-shadow: var(--shadow-md);
  }

  .article-header {
    padding: 36px 40px 24px;
  }

  .article-cat {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 16px;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--accent), #fbbf24);
    color: #fff;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.5px;
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
    margin-bottom: 18px;
  }

  .article-header h1 {
    font-size: 38px;
    line-height: 1.25;
    font-weight: 800;
    letter-spacing: -1px;
    color: var(--text-main);
    margin-bottom: 16px;
  }

  .article-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 16px;
    font-size: 14px;
    color: var(--text-muted);
  }

  .article-meta span {
    display: inline-flex;
    align-items: center;
    gap: 6px;
  }

  .article-meta .hot {
    color: var(--accent);
    font-weight: 600;
  }

  .article-cover {
    position: relative;
    overflow: hidden;
    margin: 0 40px 24px;
    border-radius: var(--radius-lg);
  }

  .article-cover img {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    transition: transform .4s ease;
  }

  .article-cover:hover img {
    transform: scale(1.02);
  }

  .article-summary {
    margin: 0 40px 28px;
    padding: 20px 24px;
    background: linear-gradient(135deg, var(--brand-50), #fff);
    border-left: 4px solid var(--brand-600);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    font-size: 15px;
    color: var(--text-sub);
  }

  .article-summary strong {
    color: var(--brand-700);
  }

  .article-content {
    padding: 0 40px 36px;
    font-size: 17px;
    line-height: 1.85;
    color: #1e293b;
  }

  .article-content h2 {
    font-size: 24px;
    font-weight: 700;
    margin: 36px 0 16px;
    color: var(--text-main);
    padding-bottom: 10px;
    border-bottom: 2px solid var(--brand-50);
  }

  .article-content h3 {
    font-size: 20px;
    font-weight: 700;
    margin: 28px 0 12px;
    color: var(--text-main);
  }

  .article-content p {
    margin-bottom: 16px;
  }

  .article-content ul,
  .article-content ol {
    margin: 16px 0;
    padding-left: 24px;
  }

  .article-content li {
    margin-bottom: 8px;
  }

  .article-content blockquote {
    margin: 24px 0;
    padding: 20px 24px;
    background: var(--bg-body);
    border-left: 4px solid var(--brand-600);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    color: var(--text-sub);
  }

  .article-content a {
    color: var(--brand-600);
    text-decoration: underline;
    text-underline-offset: 4px;
  }

  .article-content a:hover {
    color: var(--brand-700);
  }

  .article-content img {
    border-radius: var(--radius-lg);
    margin: 24px 0;
  }

  .article-content-empty {
    padding: 40px;
    text-align: center;
    color: var(--text-sub);
  }

  .article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    padding: 0 40px 30px;
  }

  .tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: var(--bg-body);
    border: 1px solid var(--border);
    border-radius: 999px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-sub);
    transition: all .2s ease;
  }

  .tag:hover {
    border-color: var(--brand-600);
    color: var(--brand-600);
    background: var(--brand-50);
  }

  .article-share {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 40px 32px;
    border-top: 1px solid var(--border);
    margin: 0 40px 36px;
  }

  .share-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-sub);
  }

  .share-btns {
    display: flex;
    gap: 10px;
  }

  .share-btn {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
    color: #fff;
    transition: all .25s ease;
    box-shadow: var(--shadow-sm);
  }

  .share-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
  }

  .share-wechat {
    background: #07c160;
  }

  .share-weibo {
    background: #e6162d;
  }

  .share-qq {
    background: #12b7f5;
  }

  .share-link {
    background: var(--brand-600);
  }

  .not-found {
    padding: 80px 40px;
    text-align: center;
  }

  .not-found i {
    font-size: 56px;
    color: var(--text-muted);
    margin-bottom: 20px;
  }

  .not-found h2 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-main);
  }

  .not-found p {
    color: var(--text-sub);
    margin-bottom: 28px;
  }

  .btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 999px;
    background: var(--brand-600);
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    transition: all .25s ease;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
  }

  .btn-primary:hover {
    background: var(--brand-700);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.35);
  }

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

  .btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 999px;
    border: 2px solid var(--brand-600);
    color: var(--brand-600);
    font-size: 15px;
    font-weight: 600;
    transition: all .25s ease;
  }

  .btn-outline:hover {
    background: var(--brand-600);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.25);
  }

  .btn-sm {
    padding: 8px 18px;
    font-size: 13px;
  }

  /* ===== 侧边栏 ===== */
  .article-sidebar {
    display: flex;
    flex-direction: column;
    gap: 24px;
    position: sticky;
    top: calc(var(--header-h) + 16px);
  }

  .side-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    transition: box-shadow .3s ease;
  }

  .side-card:hover {
    box-shadow: var(--shadow-md);
  }

  .side-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 18px;
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .side-title i {
    color: var(--brand-600);
  }

  .rank-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 4px;
  }

  .rank-list li a {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 12px 10px;
    border-radius: var(--radius-md);
    transition: background .2s ease;
  }

  .rank-list li a:hover {
    background: var(--bg-body);
  }

  .rank-num {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 700;
    background: var(--bg-body);
    color: var(--text-muted);
    flex-shrink: 0;
  }

  .rank-list li:nth-child(1) .rank-num {
    background: linear-gradient(135deg, #f59e0b, #fbbf24);
    color: #fff;
  }

  .rank-list li:nth-child(2) .rank-num {
    background: linear-gradient(135deg, #94a3b8, #cbd5e1);
    color: #fff;
  }

  .rank-list li:nth-child(3) .rank-num {
    background: linear-gradient(135deg, #d97706, #f59e0b);
    color: #fff;
  }

  .rank-cat {
    font-size: 12px;
    color: var(--text-muted);
    display: block;
    margin-bottom: 2px;
  }

  .rank-list h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-main);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .rank-list li a:hover h4 {
    color: var(--brand-600);
  }

  .guide-card {
    text-align: center;
    position: relative;
    overflow: hidden;
  }

  .guide-card img {
    width: 100%;
    height: 140px;
    object-fit: cover;
    border-radius: var(--radius-md);
    margin-bottom: 16px;
  }

  .guide-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
  }

  .guide-card p {
    font-size: 14px;
    color: var(--text-sub);
    margin-bottom: 16px;
  }

  .cat-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
  }

  .cat-tags a {
    padding: 8px 16px;
    border-radius: 999px;
    background: var(--bg-body);
    border: 1px solid var(--border);
    font-size: 13px;
    font-weight: 600;
    color: var(--text-sub);
    transition: all .2s ease;
  }

  .cat-tags a:hover {
    background: var(--brand-600);
    color: #fff;
    border-color: var(--brand-600);
  }

  /* ===== 相关推荐 ===== */
  .related-section {
    padding: 60px 0 40px;
  }

  .section-title-wrap {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 32px;
  }

  .section-title {
    font-size: 28px;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: var(--text-main);
    position: relative;
    padding-left: 18px;
  }

  .section-title::before {
    content: '';
    position: absolute;
    left: 0;
    top: 4px;
    bottom: 4px;
    width: 4px;
    border-radius: 999px;
    background: linear-gradient(180deg, var(--brand-600), var(--accent));
  }

  .section-more {
    font-size: 14px;
    font-weight: 600;
    color: var(--brand-600);
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: gap .2s ease;
  }

  .section-more:hover {
    gap: 12px;
    color: var(--brand-700);
  }

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

  .related-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: all .3s ease;
    display: flex;
    flex-direction: column;
  }

  .related-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
  }

  .related-cover {
    position: relative;
    overflow: hidden;
  }

  .related-cover img {
    width: 100%;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    transition: transform .4s ease;
  }

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

  .related-cover .related-badge {
    position: absolute;
    top: 14px;
    left: 14px;
    padding: 4px 12px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.92);
    color: var(--brand-600);
    font-size: 12px;
    font-weight: 700;
    backdrop-filter: blur(8px);
  }

  .related-body {
    padding: 20px 22px 22px;
    flex: 1;
    display: flex;
    flex-direction: column;
  }

  .related-body h3 {
    font-size: 17px;
    font-weight: 700;
    line-height: 1.5;
    margin-bottom: 8px;
    color: var(--text-main);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .related-card:hover .related-body h3 {
    color: var(--brand-600);
  }

  .related-body p {
    font-size: 14px;
    color: var(--text-sub);
    line-height: 1.6;
    margin-bottom: 14px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .related-meta {
    margin-top: auto;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 13px;
    color: var(--text-muted);
  }

  .related-meta span {
    display: inline-flex;
    align-items: center;
    gap: 4px;
  }

  /* ===== FAQ ===== */
  .faq-section {
    padding: 60px 0;
  }

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

  .faq-item {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 24px 28px;
    box-shadow: var(--shadow-sm);
    border: 1px solid transparent;
    transition: all .3s ease;
  }

  .faq-item:hover {
    border-color: var(--brand-100);
    box-shadow: var(--shadow-md);
  }

  .faq-item h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .faq-item h3 i {
    color: var(--brand-600);
    font-size: 14px;
  }

  .faq-item p {
    font-size: 15px;
    color: var(--text-sub);
    line-height: 1.7;
  }

  /* ===== CTA ===== */
  .cta-section {
    padding: 20px 0 60px;
  }

  .cta-box {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    padding: 64px 48px;
    text-align: center;
    background: linear-gradient(rgba(15, 23, 42, 0.82), rgba(15, 23, 42, 0.85)), url('/assets/images/backpic/back-2.png') center/cover no-repeat;
    color: #fff;
  }

  .cta-box h2 {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 12px;
    letter-spacing: -0.5px;
  }

  .cta-box p {
    font-size: 17px;
    color: rgba(255, 255, 255, 0.85);
    max-width: 560px;
    margin: 0 auto 28px;
  }

  .cta-box .btn-primary {
    background: var(--accent);
    box-shadow: 0 4px 20px rgba(245, 158, 11, 0.4);
  }

  .cta-box .btn-primary:hover {
    background: #d97706;
  }

  /* ===== 页脚 ===== */
  .site-footer {
    background: #0f172a;
    color: #94a3b8;
    padding: 60px 0 0;
    border-top: 3px solid var(--brand-600);
  }

  .footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
  }

  .footer-brand .logo .logo-text {
    font-size: 20px;
  }

  .footer-brand p {
    font-size: 14px;
    line-height: 1.8;
    margin-top: 16px;
    color: #64748b;
  }

  .footer-title {
    font-size: 16px;
    font-weight: 700;
    color: #e2e8f0;
    margin-bottom: 18px;
    position: relative;
    padding-bottom: 10px;
  }

  .footer-title::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 32px;
    height: 3px;
    border-radius: 3px;
    background: var(--brand-600);
  }

  .footer-links {
    list-style: none;
  }

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

  .footer-links a {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: #64748b;
    transition: all .2s ease;
  }

  .footer-links a:hover {
    color: #fff;
    padding-left: 4px;
  }

  .footer-links .fa-angle-right {
    font-size: 12px;
    color: var(--brand-600);
  }

  .footer-bottom {
    border-top: 1px solid #1e293b;
    padding: 20px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 13px;
    color: #475569;
  }

  /* ===== 浮动操作条 ===== */
  .float-bar {
    position: fixed;
    right: 28px;
    bottom: 28px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 90;
  }

  .float-btn {
    width: 44px;
    height: 44px;
    border-radius: 14px;
    background: var(--bg-card);
    color: var(--text-main);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
    transition: all .25s ease;
  }

  .float-btn:hover {
    background: var(--brand-600);
    color: #fff;
    border-color: var(--brand-600);
    transform: translateY(-2px);
  }

  /* ===== 响应式 ===== */
  @media (max-width: 1024px) {
    .article-layout {
      grid-template-columns: 1fr;
    }

    .article-sidebar {
      position: static;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }

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

  @media (max-width: 768px) {
    .container {
      padding: 0 16px;
    }

    .nav-list {
      display: none;
    }

    .menu-toggle {
      display: flex;
    }

    .search-box {
      width: 48px;
      padding: 6px;
    }

    .search-box input {
      display: none;
    }

    .search-box button {
      width: 36px;
      height: 36px;
    }

    .article-header {
      padding: 24px 20px 18px;
    }

    .article-header h1 {
      font-size: 28px;
    }

    .article-cover {
      margin: 0 16px 20px;
    }

    .article-summary {
      margin: 0 16px 20px;
      padding: 16px 18px;
    }

    .article-content {
      padding: 0 20px 24px;
      font-size: 16px;
    }

    .article-tags {
      padding: 0 20px 20px;
    }

    .article-share {
      padding: 16px 20px 24px;
      margin: 0 16px 24px;
      flex-direction: column;
      gap: 12px;
      align-items: flex-start;
    }

    .article-sidebar {
      grid-template-columns: 1fr;
    }

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

    .section-title {
      font-size: 22px;
    }

    .faq-layout {
      grid-template-columns: 1fr;
    }

    .faq-item {
      padding: 20px;
    }

    .cta-box {
      padding: 40px 20px;
    }

    .cta-box h2 {
      font-size: 24px;
    }

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

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

    .float-bar {
      right: 16px;
      bottom: 16px;
    }
  }

  @media (max-width: 520px) {
    .logo-text {
      font-size: 17px;
    }

    .logo-icon {
      width: 34px;
      height: 34px;
      font-size: 15px;
    }

    .header-inner {
      height: 64px;
      gap: 10px;
    }

    .article-header h1 {
      font-size: 23px;
    }

    .article-meta {
      gap: 10px;
      font-size: 13px;
    }

    .section-title-wrap {
      flex-direction: column;
      align-items: flex-start;
      gap: 10px;
    }

    .breadcrumb .current {
      max-width: 160px;
    }

    .related-body {
      padding: 16px;
    }
  }

  @media (max-width: 380px) {
    .search-box {
      display: none;
    }

    .article-cat {
      font-size: 12px;
    }
  }