/* roulang page: index */
:root {
    --primary: #0C3D3E;
    --primary-light: #123F3A;
    --accent: #18B8A6;
    --accent-dark: #0FA28F;
    --gold: #EAB86A;
    --bg: #F7FBFB;
    --card-bg: #FFFFFF;
    --border: #E3EFED;
    --border-dark: #D6E5E3;
    --text: #162B2E;
    --text-body: #3E5A5C;
    --text-light: #7A9496;
    --success: #1AA37A;
    --warning: #D98E32;
    --danger: #D65A5A;
    --radius-lg: 16px;
    --radius-md: 10px;
    --radius-sm: 8px;
    --radius-pill: 999px;
    --shadow-sm: 0 2px 8px rgba(12,61,62,0.06);
    --shadow-lg: 0 8px 30px rgba(12,61,62,0.10);
    --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    --font-num: "DIN Alternate", "Roboto Mono", monospace;
    --header-h: 72px;
    --container-w: 1200px;
    --space-section: 96px;
    --space-section-m: 56px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-sans);
    background: var(--bg);
    color: var(--text-body);
    line-height: 1.8;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--accent-dark); }
ul, ol { list-style: none; }
input, button, select, textarea { font-family: inherit; font-size: inherit; }
button { cursor: pointer; border: none; background: none; }
.container { max-width: var(--container-w); margin: 0 auto; padding: 0 24px; }
.hidden { display: none !important; }
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 0 24px;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    transition: all .2s ease;
    white-space: nowrap;
    line-height: 1;
}
.btn-primary {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 2px 10px rgba(24,184,166,0.25);
}
.btn-primary:hover { background: var(--accent-dark); color: #fff; transform: translateY(-1px); box-shadow: 0 6px 18px rgba(24,184,166,0.3); }
.btn-primary:active { transform: translateY(0); }
.btn-outline {
    background: transparent;
    color: var(--accent);
    border: 1px solid var(--accent);
}
.btn-outline:hover { background: rgba(24,184,166,0.06); color: var(--accent-dark); }
.btn-ghost {
    background: transparent;
    color: var(--text);
    padding: 0 14px;
}
.btn-ghost:hover { background: rgba(12,61,62,0.05); color: var(--primary); }
.btn-lg { min-height: 52px; padding: 0 32px; font-size: 16px; }
.btn-block { width: 100%; }
.section { padding: var(--space-section) 0; }
.section-header { text-align: center; max-width: 720px; margin: 0 auto 48px; }
.section-header h2 {
    font-size: 32px;
    color: var(--text);
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 12px;
}
.section-header p { font-size: 16px; color: var(--text-light); }
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 12px;
    border-radius: var(--radius-pill);
    font-size: 13px;
    font-weight: 500;
    background: rgba(24,184,166,0.1);
    color: var(--accent-dark);
}
.badge-gold { background: rgba(234,184,106,0.15); color: #b57d2e; }

/* ===== Header / Nav ===== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-h);
    background: rgba(247,251,251,0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    z-index: 1000;
    transition: background .3s ease, border-color .3s ease, box-shadow .3s ease;
}
.site-header.scrolled {
    background: rgba(247,251,251,0.95);
    border-bottom-color: var(--border);
    box-shadow: 0 2px 12px rgba(12,61,62,0.04);
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-h);
    gap: 24px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}
.logo-icon {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--accent-dark) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 18px;
}
.logo-text {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: 0.5px;
    white-space: nowrap;
}
.main-nav {
    display: flex;
    align-items: center;
    gap: 6px;
}
.main-nav .nav-link {
    position: relative;
    padding: 8px 16px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text);
    border-radius: var(--radius-sm);
    transition: all .2s ease;
}
.main-nav .nav-link:hover { color: var(--accent-dark); background: rgba(24,184,166,0.05); }
.main-nav .nav-link.active { color: var(--accent-dark); font-weight: 600; }
.main-nav .nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 16px;
    right: 16px;
    height: 2px;
    border-radius: 2px;
    background: var(--accent);
}
.header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}
.search-box {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 0 14px;
    height: 38px;
    width: 220px;
    background: #edf4f3;
    border: 1px solid transparent;
    border-radius: var(--radius-pill);
    transition: all .2s ease;
}
.search-box:focus-within {
    border-color: var(--accent);
    background: #fff;
    box-shadow: 0 0 0 4px rgba(24,184,166,0.12);
}
.search-box i { font-size: 14px; color: var(--text-light); }
.search-box input {
    flex: 1;
    border: none;
    background: transparent;
    outline: none;
    font-size: 13px;
    color: var(--text);
}
.search-box input::placeholder { color: var(--text-light); }
.search-box kbd {
    font-family: var(--font-num);
    font-size: 11px;
    color: var(--text-light);
    background: rgba(255,255,255,0.7);
    border: 1px solid var(--border);
    border-radius: 5px;
    padding: 0 5px;
    white-space: nowrap;
}
.mobile-menu-btn {
    display: none;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: var(--text);
    background: rgba(12,61,62,0.05);
    transition: background .2s;
}
.mobile-menu-btn:hover { background: rgba(12,61,62,0.1); }

/* ===== Hero ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: var(--header-h);
    background: var(--primary) url('/assets/images/backpic/back-1.png') no-repeat center center / cover;
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(115deg, rgba(12,61,62,0.96) 0%, rgba(12,61,62,0.82) 45%, rgba(18,63,58,0.65) 100%);
    z-index: 1;
}
.hero::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 80% 30%, rgba(24,184,166,0.12) 0%, transparent 60%);
    z-index: 2;
}
.hero-inner {
    position: relative;
    z-index: 3;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 60px;
    align-items: center;
    width: 100%;
}
.hero-content { color: #fff; }
.hero-content h1 {
    font-size: 44px;
    line-height: 1.25;
    font-weight: 700;
    color: #fff;
    margin-bottom: 20px;
    letter-spacing: 0.5px;
}
.hero-subtitle {
    font-size: 17px;
    line-height: 1.8;
    color: rgba(255,255,255,0.8);
    max-width: 460px;
    margin-bottom: 36px;
}
.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}
.hero-actions .btn-primary { background: var(--accent); color: #fff; }
.hero-actions .btn-primary:hover { background: #15a694; }
.hero-actions .btn-outline { border-color: rgba(255,255,255,0.5); color: #fff; }
.hero-actions .btn-outline:hover { background: rgba(255,255,255,0.1); color: #fff; }
.hero-stats {
    display: flex;
    align-items: center;
    gap: 24px;
}
.stat { display: flex; flex-direction: column; gap: 2px; }
.stat-num {
    font-family: var(--font-num);
    font-size: 30px;
    font-weight: 700;
    color: #fff;
    line-height: 1.2;
}
.stat-label { font-size: 13px; color: rgba(255,255,255,0.65); }
.stat-divider {
    width: 1px;
    height: 40px;
    background: rgba(255,255,255,0.15);
}
.hero-visual { display: flex; justify-content: center; align-items: center; position: relative; }
.hero-visual::before {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    border: 1px solid rgba(24,184,166,0.3);
    animation: float-ring 6s ease-in-out infinite;
}
.hero-visual::after {
    content: '';
    position: absolute;
    width: 360px;
    height: 360px;
    border-radius: 50%;
    border: 1px solid rgba(234,184,106,0.2);
    animation: float-ring 6s ease-in-out infinite reverse;
    top: -20px;
    right: -10px;
}
@keyframes float-ring {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}
.login-preview {
    width: 360px;
    background: #fff;
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    overflow: hidden;
    position: relative;
    z-index: 2;
}
.login-preview-header {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 14px 18px;
    background: #f8fbfb;
    border-bottom: 1px solid var(--border);
}
.preview-dot { width: 10px; height: 10px; border-radius: 50%; }
.preview-dot.red { background: #ff5f57; }
.preview-dot.yellow { background: #febc2e; }
.preview-dot.green { background: #28c840; }
.preview-title {
    flex: 1;
    text-align: center;
    font-size: 13px;
    color: var(--text-light);
    font-weight: 500;
    margin-left: -40px;
}
.login-preview-body {
    padding: 32px 28px 28px;
}
.login-preview-body h4 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text);
    text-align: center;
    margin-bottom: 8px;
}
.login-preview-body .sub {
    font-size: 13px;
    color: var(--text-light);
    text-align: center;
    margin-bottom: 24px;
}
.input-group { margin-bottom: 16px; }
.input-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 6px;
}
.input-group input {
    width: 100%;
    height: 44px;
    border: 1px solid var(--border-dark);
    border-radius: var(--radius-sm);
    padding: 0 14px;
    font-size: 14px;
    color: var(--text);
    outline: none;
    transition: all .2s ease;
    background: #fafdfd;
}
.input-group input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(24,184,166,0.12);
    background: #fff;
}
.slider-verify {
    height: 44px;
    background: #edf4f3;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 20px;
    border: 1px solid var(--border);
    user-select: none;
}
.login-btn {
    width: 100%;
    height: 46px;
    background: var(--accent);
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    transition: all .2s ease;
    box-shadow: 0 4px 12px rgba(24,184,166,0.25);
}
.login-btn:hover { background: var(--accent-dark); transform: translateY(-1px); }
.login-btn:active { transform: translateY(0); }
.third-party {
    text-align: center;
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}
.third-party > span {
    font-size: 13px;
    color: var(--text-light);
    display: block;
    margin-bottom: 14px;
}
.third-party-icons {
    display: flex;
    justify-content: center;
    gap: 20px;
}
.third-party-icons i {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: #f0f5f4;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    color: var(--text-body);
    transition: all .2s ease;
}
.third-party-icons i:hover {
    background: rgba(24,184,166,0.1);
    color: var(--accent-dark);
    transform: translateY(-2px);
}

/* ===== Metrics ===== */
.metrics {
    padding: 56px 0 24px;
    background: var(--bg);
    position: relative;
    z-index: 5;
    margin-top: -40px;
}
.metrics .container { position: relative; z-index: 6; }
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.metric-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: var(--shadow-sm);
    transition: all .2s ease;
    position: relative;
}
.metric-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: rgba(24,184,166,0.4);
    transform: translateY(-2px);
}
.metric-value {
    font-family: var(--font-num);
    font-size: 32px;
    font-weight: 700;
    color: var(--primary);
    line-height: 1.2;
    margin-bottom: 4px;
}
.metric-trend {
    font-size: 13px;
    font-weight: 600;
    color: var(--success);
    background: rgba(26,163,122,0.1);
    padding: 1px 8px;
    border-radius: var(--radius-pill);
    display: inline-block;
    margin-bottom: 8px;
}
.metric-card p {
    font-size: 15px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 2px;
}
.metric-card span {
    font-size: 13px;
    color: var(--text-light);
}

/* ===== Features ===== */
.features {
    padding: var(--space-section) 0;
    background: var(--bg);
}
.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: 28px;
    position: relative;
    transition: all .2s ease;
    box-shadow: var(--shadow-sm);
}
.feature-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: rgba(24,184,166,0.3);
    transform: translateY(-2px);
}
.feature-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    margin-bottom: 18px;
}
.feature-icon.i-login { background: rgba(24,184,166,0.1); color: var(--accent-dark); }
.feature-icon.i-security { background: rgba(12,61,62,0.08); color: var(--primary); }
.feature-icon.i-device { background: rgba(234,184,106,0.15); color: #b57d2e; }
.feature-icon.i-service { background: rgba(37,130,190,0.1); color: #2d7ec7; }
.feature-icon.i-notify { background: rgba(217,142,50,0.12); color: #c47a2e; }
.feature-icon.i-data { background: rgba(26,163,122,0.1); color: var(--success); }
.feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 8px;
}
.feature-card p {
    font-size: 14px;
    color: var(--text-body);
    line-height: 1.7;
    margin-bottom: 12px;
}
.feature-more {
    font-size: 14px;
    font-weight: 500;
    color: var(--accent-dark);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: gap .2s ease;
}
.feature-more:hover { gap: 8px; color: var(--accent-dark); }
.feature-more i { font-size: 12px; }

/* ===== Comparison ===== */
.comparison {
    padding: var(--space-section) 0;
    background: linear-gradient(180deg, var(--bg) 0%, #eef7f6 100%);
}
.comparison-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 32px;
    align-items: stretch;
    margin-top: 48px;
}
.comparison-col {
    border-radius: var(--radius-lg);
    padding: 36px;
}
.comparison-before {
    background: #fafcfc;
    border: 1px solid var(--border);
}
.comparison-after {
    background: var(--primary) url('/assets/images/backpic/back-2.webp') no-repeat center center / cover;
    border: none;
    color: #fff;
    box-shadow: var(--shadow-lg);
}
.comparison-col h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.comparison-before h3 { color: var(--text); }
.comparison-after h3 { color: #fff; }
.comparison-col h3 i { font-size: 20px; }
.comparison-list { display: flex; flex-direction: column; gap: 18px; }
.comparison-list li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-size: 15px;
    line-height: 1.7;
}
.comparison-before .comparison-list li { color: var(--text-body); }
.comparison-after .comparison-list li { color: rgba(255,255,255,0.85); }
.comparison-list li i {
    margin-top: 4px;
    font-size: 14px;
    flex-shrink: 0;
}
.comparison-before .comparison-list li i { color: var(--danger); }
.comparison-after .comparison-list li i { color: var(--accent); }
.comparison-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: var(--accent);
}
.comparison-tag {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    padding: 2px 10px;
    border-radius: var(--radius-pill);
    margin-bottom: 10px;
    background: rgba(234,184,106,0.15);
    color: #b57d2e;
}
.comparison-after .comparison-tag {
    background: rgba(24,184,166,0.2);
    color: var(--accent);
}

/* ===== News ===== */
.news { padding: var(--space-section) 0; background: var(--bg); }
.news-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-top: 12px;
}
.news-card {
    display: flex;
    gap: 16px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 16px;
    transition: all .2s ease;
    box-shadow: var(--shadow-sm);
}
.news-card:hover {
    box-shadow: var(--shadow-lg);
    border-color: rgba(24,184,166,0.35);
    transform: translateY(-2px);
}
.news-thumb {
    width: 120px;
    height: 80px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    flex-shrink: 0;
    background: #eef4f3;
}
.news-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform .3s ease;
}
.news-card:hover .news-thumb img { transform: scale(1.05); }
.news-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 0;
}
.news-body .news-badge {
    align-self: flex-start;
    font-size: 12px;
    font-weight: 500;
    padding: 1px 10px;
    border-radius: var(--radius-pill);
    background: rgba(24,184,166,0.1);
    color: var(--accent-dark);
}
.news-body h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
    line-height: 1.4;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    transition: color .2s;
}
.news-body h3:hover { color: var(--accent-dark); }
.news-body p {
    font-size: 13px;
    color: var(--text-light);
    line-height: 1.6;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}
.news-date {
    font-size: 12px;
    color: var(--text-light);
    display: flex;
    align-items: center;
    gap: 5px;
    margin-top: auto;
}
.news-empty {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 20px;
    background: var(--card-bg);
    border: 1px dashed var(--border-dark);
    border-radius: var(--radius-lg);
    color: var(--text-light);
}
.news-empty i { font-size: 36px; margin-bottom: 12px; color: var(--border-dark); }
.news-empty p { font-size: 15px; }

/* ===== FAQ ===== */
.faq {
    padding: var(--space-section) 0;
    background: linear-gradient(180deg, var(--bg) 0%, #f0f8f6 100%);
}
.faq-list {
    max-width: 760px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.faq-item {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: all .2s ease;
}
.faq-item:hover { border-color: rgba(24,184,166,0.3); }
.faq-item.active { box-shadow: var(--shadow-sm); border-color: rgba(24,184,166,0.4); }
.faq-question {
    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);
    transition: color .2s;
    user-select: none;
    background: none;
    border: none;
    text-align: left;
    width: 100%;
}
.faq-question:hover { color: var(--accent-dark); }
.faq-question .faq-icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: rgba(24,184,166,0.1);
    color: var(--accent-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    transition: all .3s ease;
}
.faq-item.active .faq-icon { transform: rotate(45deg); background: var(--accent); color: #fff; }
.faq-answer {
    padding: 0 24px 20px;
    font-size: 15px;
    color: var(--text-body);
    line-height: 1.8;
    display: none;
}
.faq-item.active .faq-answer { display: block; animation: fadeIn .3s ease; }
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== Contact / CTA ===== */
.contact {
    padding: var(--space-section) 0;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    position: relative;
    overflow: hidden;
}
.contact::before {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    border: 1px solid rgba(255,255,255,0.06);
    top: -100px;
    right: -100px;
}
.contact::after {
    content: '';
    position: absolute;
    width: 250px;
    height: 250px;
    border-radius: 50%;
    background: rgba(24,184,166,0.08);
    bottom: -60px;
    left: 80px;
}
.contact-inner {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.contact-copy { color: #fff; }
.contact-copy h2 {
    font-size: 32px;
    font-weight: 700;
    line-height: 1.4;
    color: #fff;
    margin-bottom: 16px;
}
.contact-copy p {
    font-size: 16px;
    color: rgba(255,255,255,0.75);
    line-height: 1.8;
    margin-bottom: 24px;
    max-width: 420px;
}
.contact-features {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.contact-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 15px;
    color: rgba(255,255,255,0.85);
}
.contact-features li i {
    color: var(--accent);
    font-size: 14px;
}
.contact-form-wrap {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 36px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.25);
}
.contact-form-wrap h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 6px;
}
.contact-form-wrap .form-sub {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 24px;
}
.form-group { margin-bottom: 18px; }
.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text);
    margin-bottom: 6px;
}
.form-group input,
.form-group select {
    width: 100%;
    height: 48px;
    border: 1px solid var(--border-dark);
    border-radius: var(--radius-md);
    padding: 0 14px;
    font-size: 14px;
    color: var(--text);
    outline: none;
    background: #fafdfd;
    transition: all .2s ease;
    appearance: none;
}
.form-group select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%237A9496' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
}
.form-group input:focus,
.form-group select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(24,184,166,0.1);
    background-color: #fff;
}
.form-group input.error,
.form-group select.error { border-color: var(--danger); }
.form-group .error-msg {
    font-size: 12px;
    color: var(--danger);
    margin-top: 4px;
    display: none;
}
.form-group.error .error-msg { display: block; }
.form-submit-btn {
    width: 100%;
    height: 50px;
    background: var(--accent);
    color: #fff;
    font-size: 16px;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all .2s ease;
    box-shadow: 0 4px 12px rgba(24,184,166,0.25);
    margin-top: 4px;
}
.form-submit-btn:hover { background: var(--accent-dark); transform: translateY(-1px); box-shadow: 0 6px 18px rgba(24,184,166,0.3); }
.form-submit-btn:active { transform: translateY(0); }
.form-submit-btn.loading {
    background: var(--accent-dark);
    opacity: 0.7;
    cursor: wait;
}
.form-submit-btn.loading::before {
    content: '';
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255,255,255,0.4);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-right: 8px;
    vertical-align: middle;
}
@keyframes spin { to { transform: rotate(360deg); } }
.form-success {
    text-align: center;
    padding: 30px 10px;
    display: none;
}
.form-success i {
    font-size: 48px;
    color: var(--success);
    margin-bottom: 12px;
}
.form-success h4 {
    font-size: 20px;
    color: var(--text);
    margin-bottom: 6px;
}
.form-success p {
    font-size: 14px;
    color: var(--text-light);
}

/* ===== Footer ===== */
.site-footer {
    background: #eaf2f1;
    border-top: 1px solid var(--border);
    padding-top: 56px;
}
.footer-top {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 48px;
}
.footer-brand .logo-text { font-size: 22px; }
.footer-brand p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
    margin-top: 12px;
    max-width: 240px;
}
.footer-brand .footer-social {
    display: flex;
    gap: 12px;
    margin-top: 18px;
}
.footer-brand .footer-social a {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
    color: var(--text-body);
    border: 1px solid var(--border);
    transition: all .2s ease;
}
.footer-brand .footer-social a:hover {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
    transform: translateY(-2px);
}
.footer-col h4 {
    font-size: 14px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 16px;
}
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul a {
    font-size: 14px;
    color: var(--text-light);
    transition: color .2s;
}
.footer-col ul a:hover { color: var(--accent-dark); }
.footer-bottom {
    border-top: 1px solid var(--border);
    padding: 20px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    font-size: 13px;
    color: var(--text-light);
}
.footer-bottom a { color: var(--text-light); }
.footer-bottom a:hover { color: var(--accent-dark); }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .header-actions .search-box { display: none; }
    .main-nav { gap: 0; }
    .hero-inner { gap: 40px; }
    .metrics-grid { grid-template-columns: repeat(2, 1fr); }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .contact-inner { grid-template-columns: 1fr; gap: 40px; }
    .footer-top { grid-template-columns: repeat(3, 1fr); }
    .footer-brand { grid-column: 1 / -1; }
}
@media (max-width: 768px) {
    .section { padding: var(--space-section-m) 0; }
    .header-inner { gap: 8px; }
    .main-nav {
        position: fixed;
        top: var(--header-h);
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        gap: 0;
        padding: 12px 24px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-lg);
        transform: translateY(-120%);
        transition: transform .3s ease;
        z-index: 999;
    }
    .main-nav.open { transform: translateY(0); }
    .main-nav .nav-link {
        width: 100%;
        padding: 14px 12px;
        border-radius: var(--radius-md);
    }
    .main-nav .nav-link.active::after { display: none; }
    .main-nav .nav-link.active { background: rgba(24,184,166,0.08); }
    .header-actions .btn-ghost { display: none; }
    .header-actions .btn-primary { padding: 0 16px; font-size: 14px; min-height: 40px; }
    .mobile-menu-btn { display: flex; }
    .hero { min-height: auto; padding: 120px 0 60px; }
    .hero-inner { grid-template-columns: 1fr; }
    .hero-content h1 { font-size: 32px; }
    .hero-stats { flex-wrap: wrap; gap: 16px; }
    .stat-divider { display: none; }
    .hero-visual { margin-top: 20px; }
    .login-preview { width: 100%; max-width: 360px; }
    .metrics { margin-top: 0; padding-top: 40px; }
    .metrics-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .metric-card { padding: 20px; }
    .metric-value { font-size: 24px; }
    .features-grid { grid-template-columns: 1fr; gap: 16px; }
    .comparison-grid { grid-template-columns: 1fr; }
    .comparison-arrow { transform: rotate(90deg); padding: 8px 0; }
    .news-grid { grid-template-columns: 1fr; }
    .news-thumb { width: 90px; height: 70px; }
    .news-body h3 { font-size: 15px; }
    .contact-form-wrap { padding: 24px; }
    .footer-top { grid-template-columns: repeat(2, 1fr); gap: 28px; }
    .footer-bottom { flex-direction: column; text-align: center; justify-content: center; }
}
@media (max-width: 520px) {
    .metrics-grid { grid-template-columns: 1fr; }
    .hero-actions { flex-direction: column; }
    .hero-actions .btn { width: 100%; }
    .header-actions .btn-primary { display: none; }
    .contact-copy h2 { font-size: 26px; }
    .footer-top { grid-template-columns: 1fr; }
}

/* roulang page: category1 */
:root {
            --primary: #0C3D3E;
            --primary-light: #123F3A;
            --accent: #18B8A6;
            --accent-dark: #0FA28F;
            --accent-light: rgba(24, 184, 166, .08);
            --gold: #EAB86A;
            --bg: #F7FBFB;
            --card: #FFFFFF;
            --border: #E3EFED;
            --text-title: #162B2E;
            --text-body: #3E5A5C;
            --text-muted: #7A9496;
            --success: #1AA37A;
            --warning: #D98E32;
            --error: #D65A5A;
            --radius-lg: 16px;
            --radius-md: 10px;
            --radius-sm: 8px;
            --shadow-sm: 0 2px 8px rgba(12, 61, 62, .06);
            --shadow-lg: 0 8px 30px rgba(12, 61, 62, .10);
            --font-main: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            --font-num: "DIN Alternate", "Roboto Mono", monospace;
            --container: 1200px;
            --space-section: 96px;
            --space-section-mobile: 56px;
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-main);
            font-size: 16px;
            line-height: 1.8;
            color: var(--text-body);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: all .2s ease;
        }
        img {
            max-width: 100%;
            display: block;
        }
        button,
        input {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
        }
        ul {
            list-style: none;
        }
        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-height: 48px;
            padding: 0 28px;
            border-radius: var(--radius-md);
            font-size: 15px;
            font-weight: 600;
            line-height: 1;
            cursor: pointer;
            transition: all .2s ease;
            gap: 8px;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 4px 14px rgba(24, 184, 166, .25);
        }
        .btn-primary:hover {
            background: var(--accent-dark);
            transform: translateY(-1px);
            box-shadow: 0 6px 20px rgba(24, 184, 166, .35);
        }
        .btn-primary:active {
            transform: translateY(1px);
            box-shadow: 0 2px 8px rgba(24, 184, 166, .20);
        }
        .btn-outline {
            border: 1px solid var(--accent);
            color: var(--accent);
            background: transparent;
        }
        .btn-outline:hover {
            background: var(--accent-light);
            border-color: var(--accent-dark);
        }
        .btn-outline-light {
            border: 1px solid rgba(255, 255, 255, .6);
            color: #fff;
            background: transparent;
        }
        .btn-outline-light:hover {
            background: rgba(255, 255, 255, .12);
            border-color: #fff;
        }
        .btn-lg {
            min-height: 56px;
            padding: 0 36px;
            font-size: 16px;
        }
        .btn-sm {
            min-height: 40px;
            padding: 0 20px;
            font-size: 14px;
        }

        /* Header */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(247, 251, 251, .85);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid transparent;
            transition: border-color .2s ease, box-shadow .2s ease;
        }
        .site-header.scrolled {
            border-bottom-color: var(--border);
            box-shadow: 0 2px 12px rgba(12, 61, 62, .06);
        }
        .header-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            height: 72px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .logo-icon {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--primary), var(--accent-dark));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 16px;
        }
        .logo-text {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-title);
            letter-spacing: .5px;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav-link {
            padding: 8px 16px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-body);
            border-radius: 8px;
            transition: all .2s ease;
        }
        .nav-link:hover {
            color: var(--primary);
            background: var(--accent-light);
        }
        .nav-link.active {
            color: var(--primary);
            font-weight: 600;
            background: var(--accent-light);
        }
        .header-actions {
            display: flex;
            align-items: center;
            gap: 12px;
            flex-shrink: 0;
        }
        .search-box {
            position: relative;
            width: 220px;
            height: 40px;
            background: rgba(227, 239, 237, .55);
            border: 1px solid transparent;
            border-radius: 999px;
            display: flex;
            align-items: center;
            padding: 0 12px;
            gap: 8px;
            transition: all .2s ease;
        }
        .search-box i {
            color: var(--text-muted);
            font-size: 13px;
        }
        .search-box input {
            flex: 1;
            background: transparent;
            font-size: 13px;
            color: var(--text-title);
            min-width: 0;
        }
        .search-box input::placeholder {
            color: var(--text-muted);
        }
        .search-box:hover {
            border-color: var(--accent);
        }
        .search-box:focus-within {
            border-color: var(--accent);
            box-shadow: 0 0 0 4px rgba(24, 184, 166, .12);
            background: #fff;
        }
        .search-kbd {
            font-size: 11px;
            color: var(--text-muted);
            background: rgba(255, 255, 255, .7);
            border: 1px solid var(--border);
            border-radius: 6px;
            padding: 2px 6px;
            font-family: var(--font-num);
            line-height: 1.4;
            flex-shrink: 0;
        }
        .menu-toggle {
            display: none;
            width: 40px;
            height: 40px;
            border-radius: 10px;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: var(--primary);
            cursor: pointer;
            border: 1px solid var(--border);
            background: #fff;
            transition: all .2s ease;
        }
        .menu-toggle:hover {
            border-color: var(--accent);
            color: var(--accent);
        }

        /* Category Hero */
        .cat-hero {
            position: relative;
            padding: 180px 0 100px;
            background: linear-gradient(135deg, rgba(12, 61, 62, .92), rgba(18, 63, 58, .96)), url('/assets/images/backpic/back-1.png') center/cover no-repeat;
            color: #fff;
            overflow: hidden;
        }
        .cat-hero::before {
            content: '';
            position: absolute;
            width: 260px;
            height: 260px;
            border-radius: 50%;
            border: 1px solid rgba(234, 184, 106, .25);
            top: -80px;
            right: -60px;
            animation: floatCircle 6s ease-in-out infinite;
        }
        .cat-hero::after {
            content: '';
            position: absolute;
            width: 120px;
            height: 120px;
            border-radius: 50%;
            border: 1px solid rgba(24, 184, 166, .35);
            bottom: 30px;
            left: 8%;
            animation: floatCircle 8s ease-in-out infinite reverse;
        }
        @keyframes floatCircle {
            0%,
            100% {
                transform: translateY(0);
            }
            50% {
                transform: translateY(16px);
            }
        }
        .cat-hero-inner {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 760px;
            margin: 0 auto;
        }
        .cat-hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(234, 184, 106, .15);
            border: 1px solid rgba(234, 184, 106, .4);
            color: var(--gold);
            font-size: 13px;
            font-weight: 600;
            padding: 6px 16px;
            border-radius: 999px;
            margin-bottom: 24px;
        }
        .cat-hero h1 {
            font-size: 44px;
            line-height: 1.25;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: 2px;
        }
        .cat-hero-desc {
            font-size: 16px;
            line-height: 1.8;
            color: rgba(255, 255, 255, .85);
            max-width: 620px;
            margin: 0 auto 32px;
        }
        .cat-hero-actions {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 40px;
        }
        .cat-hero-meta {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 24px;
            font-size: 13px;
            color: rgba(255, 255, 255, .7);
        }
        .cat-hero-meta span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .cat-hero-meta i {
            color: var(--accent);
        }

        /* Stats Band */
        .stats-band {
            padding: 48px 0;
            background: var(--card);
            border-bottom: 1px solid var(--border);
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-card {
            padding: 24px;
            background: var(--card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            text-align: center;
            transition: all .2s ease;
            position: relative;
        }
        .stat-card:hover {
            border-color: rgba(24, 184, 166, .4);
            box-shadow: var(--shadow-sm);
        }
        .stat-card+.stat-card::before {
            content: none;
        }
        .stat-num {
            display: block;
            font-family: var(--font-num);
            font-size: 32px;
            font-weight: 700;
            color: var(--primary);
            line-height: 1.2;
            margin-bottom: 4px;
        }
        .stat-num small {
            font-size: 16px;
            font-weight: 600;
            margin-left: 2px;
        }
        .stat-label {
            display: block;
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 8px;
        }
        .stat-trend {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            font-size: 13px;
            color: var(--success);
            background: rgba(26, 163, 122, .08);
            padding: 3px 10px;
            border-radius: 999px;
            font-weight: 500;
        }

        /* Section base */
        .section-pad {
            padding: 96px 0;
        }
        .section-head {
            text-align: center;
            max-width: 680px;
            margin: 0 auto 56px;
        }
        .section-head h2 {
            font-size: 32px;
            line-height: 1.4;
            font-weight: 700;
            color: var(--text-title);
            margin-bottom: 12px;
        }
        .section-head p {
            font-size: 16px;
            line-height: 1.8;
            color: var(--text-muted);
        }

        /* Methods */
        .methods-section {
            padding: 96px 0;
        }
        .methods-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .method-card {
            background: var(--card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 32px;
            display: flex;
            flex-direction: column;
            gap: 12px;
            transition: all .2s ease;
            position: relative;
        }
        .method-card:hover {
            border-color: rgba(24, 184, 166, .4);
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
        }
        .method-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: var(--accent-light);
            color: var(--accent);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            margin-bottom: 4px;
        }
        .method-card h3 {
            font-size: 20px;
            font-weight: 600;
            color: var(--text-title);
        }
        .method-card p {
            font-size: 15px;
            line-height: 1.7;
            color: var(--text-muted);
        }

        /* Steps */
        .steps-section {
            padding: 96px 0;
            background: linear-gradient(180deg, #F7FBFB 0%, #F0F8F7 100%);
        }
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .step-item {
            background: var(--card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            position: relative;
            transition: all .2s ease;
        }
        .step-item:hover {
            border-color: rgba(24, 184, 166, .4);
            box-shadow: var(--shadow-sm);
        }
        .step-num {
            font-family: var(--font-num);
            font-size: 28px;
            font-weight: 700;
            color: var(--accent);
            display: block;
            margin-bottom: 16px;
            opacity: .8;
        }
        .step-item h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-title);
            margin-bottom: 8px;
        }
        .step-item p {
            font-size: 14px;
            line-height: 1.7;
            color: var(--text-muted);
        }

        /* Scenarios */
        .scenarios-section {
            padding: 96px 0;
        }
        .scenarios-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .scenario-card {
            background: var(--card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            text-align: center;
            transition: all .2s ease;
        }
        .scenario-card:hover {
            border-color: rgba(24, 184, 166, .4);
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
        }
        .scenario-icon {
            width: 56px;
            height: 56px;
            border-radius: 14px;
            background: linear-gradient(135deg, var(--primary), var(--accent-dark));
            color: #fff;
            font-size: 22px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
        }
        .scenario-card h3 {
            font-size: 19px;
            font-weight: 600;
            color: var(--text-title);
            margin-bottom: 10px;
        }
        .scenario-card p {
            font-size: 14px;
            line-height: 1.7;
            color: var(--text-muted);
        }

        /* Resources */
        .resources-section {
            padding: 96px 0;
            background: var(--card);
        }
        .resources-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .resource-card {
            background: var(--card);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all .2s ease;
            display: flex;
            flex-direction: column;
        }
        .resource-card:hover {
            border-color: rgba(24, 184, 166, .4);
            box-shadow: var(--shadow-lg);
        }
        .resource-thumb {
            position: relative;
            height: 160px;
            overflow: hidden;
        }
        .resource-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .3s ease;
        }
        .resource-card:hover .resource-thumb img {
            transform: scale(1.02);
        }
        .resource-cat {
            position: absolute;
            top: 12px;
            left: 12px;
            background: rgba(255, 255, 255, .92);
            color: var(--primary);
            font-size: 12px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 999px;
            backdrop-filter: blur(8px);
            border: 1px solid var(--border);
        }
        .resource-body {
            padding: 20px 24px 24px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }
        .resource-body h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--text-title);
            margin-bottom: 8px;
        }
        .resource-body p {
            font-size: 14px;
            line-height: 1.7;
            color: var(--text-muted);
            margin-bottom: 16px;
            flex: 1;
        }
        .resource-link {
            font-size: 14px;
            font-weight: 600;
            color: var(--accent);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: all .2s ease;
        }
        .resource-link:hover {
            color: var(--accent-dark);
            gap: 10px;
        }

        /* FAQ */
        .faq-section {
            padding: 96px 0;
        }
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--card);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            margin-bottom: 14px;
            overflow: hidden;
            transition: all .2s ease;
        }
        .faq-item:hover {
            border-color: rgba(24, 184, 166, .35);
        }
        .faq-item.open {
            border-color: rgba(24, 184, 166, .45);
            box-shadow: var(--shadow-sm);
        }
        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 20px 24px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-title);
            text-align: left;
            cursor: pointer;
            transition: all .2s ease;
            background: transparent;
        }
        .faq-question:hover {
            color: var(--accent);
        }
        .faq-question i {
            font-size: 14px;
            color: var(--text-muted);
            transition: transform .3s ease;
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(45deg);
            color: var(--accent);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height .35s ease;
        }
        .faq-answer p {
            padding: 0 24px 20px;
            font-size: 15px;
            line-height: 1.8;
            color: var(--text-body);
        }

        /* CTA */
        .cta-section {
            padding: 80px 0;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            width: 300px;
            height: 300px;
            border-radius: 50%;
            border: 1px solid rgba(24, 184, 166, .2);
            top: -100px;
            right: -80px;
        }
        .cta-section::after {
            content: '';
            position: absolute;
            width: 160px;
            height: 160px;
            border-radius: 50%;
            border: 1px solid rgba(234, 184, 106, .2);
            bottom: -50px;
            left: 10%;
        }
        .cta-inner {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 620px;
            margin: 0 auto;
        }
        .cta-inner h2 {
            font-size: 32px;
            font-weight: 700;
            color: #fff;
            line-height: 1.4;
            margin-bottom: 12px;
        }
        .cta-inner p {
            font-size: 16px;
            color: rgba(255, 255, 255, .8);
            margin-bottom: 32px;
        }

        /* Footer */
        .site-footer {
            background: #EAF2F1;
            border-top: 1px solid var(--border);
        }
        .footer-top {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
            gap: 40px;
            padding: 64px 0 48px;
        }
        .footer-brand .logo {
            margin-bottom: 16px;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.8;
            color: var(--text-muted);
            margin-bottom: 20px;
            max-width: 300px;
        }
        .footer-social {
            display: flex;
            gap: 10px;
        }
        .footer-social a {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: var(--card);
            border: 1px solid var(--border);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-muted);
            font-size: 14px;
            transition: all .2s ease;
        }
        .footer-social a:hover {
            color: var(--accent);
            border-color: var(--accent);
            transform: translateY(-2px);
        }
        .footer-col h4 {
            font-size: 14px;
            font-weight: 700;
            color: var(--text-title);
            margin-bottom: 16px;
            letter-spacing: .5px;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul a {
            font-size: 14px;
            color: var(--text-body);
            transition: all .2s ease;
        }
        .footer-col ul a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            border-top: 1px solid var(--border);
            padding: 24px 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: var(--text-muted);
        }
        .footer-bottom a {
            color: var(--text-muted);
        }
        .footer-bottom a:hover {
            color: var(--accent);
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .search-box {
                width: 160px;
            }
            .main-nav {
                gap: 4px;
            }
            .nav-link {
                padding: 8px 12px;
                font-size: 14px;
            }
            .btn-sm {
                padding: 0 14px;
            }
            .footer-top {
                grid-template-columns: 1fr 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: span 3;
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .scenarios-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .resources-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 768px) {
            .header-actions .search-box,
            .header-actions .btn-outline,
            .header-actions .btn-primary {
                display: none;
            }
            .menu-toggle {
                display: flex;
            }
            .main-nav {
                position: fixed;
                top: 72px;
                left: 0;
                right: 0;
                background: var(--card);
                border-bottom: 1px solid var(--border);
                flex-direction: column;
                padding: 16px 24px;
                gap: 8px;
                transform: translateY(-100%);
                opacity: 0;
                visibility: hidden;
                transition: all .3s ease;
                box-shadow: 0 12px 24px rgba(12, 61, 62, .08);
                z-index: 999;
            }
            .main-nav.open {
                transform: translateY(0);
                opacity: 1;
                visibility: visible;
            }
            .main-nav .nav-link {
                width: 100%;
                text-align: left;
                padding: 12px 16px;
            }
            .cat-hero {
                padding: 140px 0 72px;
            }
            .cat-hero h1 {
                font-size: 32px;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .methods-grid {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .scenarios-grid {
                grid-template-columns: 1fr;
            }
            .resources-grid {
                grid-template-columns: 1fr;
            }
            .methods-section,
            .steps-section,
            .scenarios-section,
            .resources-section,
            .faq-section {
                padding: 56px 0;
            }
            .section-head h2,
            .cta-inner h2 {
                font-size: 26px;
            }
            .footer-top {
                grid-template-columns: 1fr 1fr;
            }
            .footer-brand {
                grid-column: span 2;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
                justify-content: center;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
            }
            .stat-num {
                font-size: 24px;
            }
            .cat-hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .cat-hero-actions .btn {
                width: 100%;
                max-width: 280px;
            }
            .cat-hero-meta {
                flex-direction: column;
                gap: 8px;
            }
            .footer-top {
                grid-template-columns: 1fr;
                padding: 48px 0 32px;
            }
            .footer-brand {
                grid-column: span 1;
            }
        }

/* roulang page: article */
:root {
            --primary: #0C3D3E;
            --primary-soft: #123F3A;
            --accent: #18B8A6;
            --accent-dark: #0FA28F;
            --gold: #EAB86A;
            --bg: #F7FBFB;
            --card-bg: #FFFFFF;
            --border: #E3EFED;
            --title-color: #162B2E;
            --body-color: #3E5A5C;
            --muted-color: #7A9496;
            --success: #1AA37A;
            --warning: #D98E32;
            --error: #D65A5A;
            --radius-lg: 16px;
            --radius-md: 10px;
            --radius-sm: 8px;
            --shadow-sm: 0 2px 8px rgba(12, 61, 62, 0.06);
            --shadow-md: 0 8px 30px rgba(12, 61, 62, 0.10);
            --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            --font-mono: "DIN Alternate", "Roboto Mono", monospace;
            --transition: all 0.2s ease;
        }

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

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

        body {
            font-family: var(--font-sans);
            background: var(--bg);
            color: var(--body-color);
            line-height: 1.8;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition);
        }

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

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
        }

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

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            height: 48px;
            padding: 0 28px;
            border-radius: var(--radius-md);
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            white-space: nowrap;
            transition: var(--transition);
            border: 1px solid transparent;
        }

        .btn-primary {
            background: var(--accent);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--accent-dark);
            transform: translateY(-1px);
            box-shadow: 0 8px 20px rgba(24, 184, 166, 0.28);
        }
        .btn-primary:active {
            transform: translateY(1px);
        }

        .btn-outline {
            background: transparent;
            border-color: var(--accent);
            color: var(--accent);
        }
        .btn-outline:hover {
            background: rgba(24, 184, 166, 0.08);
        }

        .btn-lg {
            height: 54px;
            padding: 0 38px;
            font-size: 16px;
        }

        /* ===== Header ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(247, 251, 251, 0.85);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid transparent;
            transition: var(--transition);
        }
        .site-header.scrolled {
            border-bottom-color: var(--border);
            box-shadow: var(--shadow-sm);
        }

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

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .logo-icon {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 16px;
        }
        .logo-text {
            font-size: 19px;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: 0.5px;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 28px;
        }
        .main-nav .nav-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--body-color);
            position: relative;
        }
        .main-nav .nav-link::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: -6px;
            width: 100%;
            height: 2px;
            border-radius: 2px;
            background: var(--accent);
            transform: scaleX(0);
            transform-origin: center;
            transition: var(--transition);
        }
        .main-nav .nav-link:hover {
            color: var(--primary);
        }
        .main-nav .nav-link:hover::after,
        .main-nav .nav-link.active::after {
            transform: scaleX(1);
        }
        .main-nav .nav-link.active {
            color: var(--primary);
            font-weight: 600;
        }

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

        .search-box {
            display: flex;
            align-items: center;
            gap: 8px;
            width: 220px;
            height: 40px;
            padding: 0 14px;
            background: #EDF4F3;
            border-radius: 999px;
            border: 1px solid transparent;
            transition: var(--transition);
        }
        .search-box i {
            color: var(--muted-color);
            font-size: 14px;
        }
        .search-box input {
            flex: 1;
            min-width: 0;
            font-size: 13px;
            color: var(--title-color);
            background: transparent;
        }
        .search-box input::placeholder {
            color: var(--muted-color);
        }
        .search-box kbd {
            font-size: 10px;
            font-family: var(--font-sans);
            background: #fff;
            border: 1px solid var(--border);
            border-radius: 4px;
            padding: 1px 5px;
            color: var(--muted-color);
            white-space: nowrap;
        }
        .search-box:hover {
            border-color: rgba(24, 184, 166, 0.4);
        }
        .search-box:focus-within {
            border-color: var(--accent);
            box-shadow: 0 0 0 4px rgba(24, 184, 166, 0.12);
        }

        .header-actions .btn {
            height: 40px;
            padding: 0 20px;
            font-size: 14px;
            border-radius: 8px;
        }

        .menu-toggle {
            display: none;
            width: 40px;
            height: 40px;
            border-radius: 8px;
            background: transparent;
            color: var(--primary);
            font-size: 20px;
            cursor: pointer;
            transition: var(--transition);
        }
        .menu-toggle:hover {
            background: rgba(12, 61, 62, 0.08);
        }

        /* ===== 页面区块 ===== */
        .section {
            padding: 96px 0;
        }

        .section-header {
            text-align: center;
            margin-bottom: 56px;
        }
        .section-header .badge {
            display: inline-block;
            background: rgba(24, 184, 166, 0.1);
            color: var(--accent-dark);
            font-size: 13px;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 999px;
            margin-bottom: 14px;
        }
        .section-header h2 {
            font-size: 32px;
            font-weight: 700;
            color: var(--title-color);
            line-height: 1.4;
            letter-spacing: 1px;
        }
        .section-header p {
            margin-top: 12px;
            color: var(--muted-color);
            font-size: 16px;
            max-width: 640px;
            margin-left: auto;
            margin-right: auto;
        }

        /* ===== 文章 Banner ===== */
        .article-banner {
            background: linear-gradient(180deg, rgba(12, 61, 62, 0.94), rgba(18, 63, 58, 0.88)), url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            padding: 56px 0 48px;
            color: #fff;
        }

        .article-breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.72);
            margin-bottom: 24px;
        }
        .article-breadcrumb a {
            color: rgba(255, 255, 255, 0.72);
        }
        .article-breadcrumb a:hover {
            color: var(--accent);
        }
        .article-breadcrumb .sep {
            opacity: 0.5;
        }
        .article-breadcrumb .current {
            color: rgba(255, 255, 255, 0.92);
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
            max-width: 360px;
        }

        .article-banner h1 {
            font-size: 38px;
            line-height: 1.35;
            font-weight: 700;
            color: #fff;
            max-width: 900px;
            letter-spacing: 1px;
        }

        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 20px;
            margin-top: 22px;
            color: rgba(255, 255, 255, 0.85);
            font-size: 14px;
        }
        .article-meta .meta-item {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }
        .article-meta .meta-item i {
            color: var(--accent);
            font-size: 14px;
        }
        .article-banner .article-meta {
            margin-top: 16px;
        }

        /* ===== 文章正文区 ===== */
        .article-content-section {
            padding: 64px 0 40px;
        }

        .article-layout {
            max-width: 920px;
            margin: 0 auto;
        }

        .article-content {
            width: 100%;
            max-width: 720px;
            margin: 0 auto;
            font-size: 16px;
            line-height: 1.9;
            color: var(--body-color);
        }

        .article-content h2 {
            font-size: 26px;
            font-weight: 700;
            color: var(--title-color);
            margin-top: 44px;
            margin-bottom: 18px;
            line-height: 1.5;
            padding-bottom: 10px;
            border-bottom: 1px solid var(--border);
        }
        .article-content h3 {
            font-size: 21px;
            font-weight: 600;
            color: var(--title-color);
            margin-top: 34px;
            margin-bottom: 14px;
            line-height: 1.5;
        }
        .article-content p {
            margin-bottom: 22px;
            line-height: 1.9;
        }
        .article-content a {
            color: var(--accent-dark);
            font-weight: 500;
            border-bottom: 1px solid rgba(24, 184, 166, 0.3);
        }
        .article-content a:hover {
            color: var(--accent);
            border-bottom-color: var(--accent);
        }
        .article-content ul,
        .article-content ol {
            margin: 0 0 22px 24px;
            line-height: 1.9;
        }
        .article-content li {
            margin-bottom: 8px;
        }
        .article-content img {
            border-radius: 12px;
            margin: 28px 0;
            box-shadow: var(--shadow-sm);
        }
        .article-content blockquote {
            margin: 30px 0;
            padding: 18px 24px;
            border-left: 4px solid var(--accent);
            background: #F0F9F7;
            border-radius: 0 10px 10px 0;
            color: var(--body-color);
            font-size: 15px;
        }
        .article-content pre {
            background: var(--primary);
            color: #DFF2EF;
            padding: 20px 24px;
            border-radius: 10px;
            overflow-x: auto;
            font-family: var(--font-mono);
            font-size: 14px;
            line-height: 1.7;
            margin: 28px 0;
        }
        .article-content pre code {
            background: transparent;
            color: inherit;
            padding: 0;
        }
        .article-content code {
            background: #F0F9F7;
            color: var(--primary);
            padding: 2px 6px;
            border-radius: 4px;
            font-family: var(--font-mono);
            font-size: 14px;
        }
        .article-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 28px 0;
            font-size: 15px;
        }
        .article-content table th {
            background: #F0F9F7;
            color: var(--title-color);
            font-weight: 600;
            text-align: left;
            padding: 14px 16px;
            border: 1px solid var(--border);
        }
        .article-content table td {
            padding: 12px 16px;
            border: 1px solid var(--border);
            line-height: 1.7;
        }
        .article-content table tr:hover {
            background: rgba(24, 184, 166, 0.03);
        }
        .article-content hr {
            border: none;
            border-top: 1px solid var(--border);
            margin: 36px 0;
        }

        /* ===== 文章尾部 ===== */
        .article-extras {
            padding: 24px 0 72px;
        }
        .article-extras .container {
            max-width: 720px;
            margin: 0 auto;
        }

        .article-footer-line {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 18px;
            padding-top: 24px;
            border-top: 1px solid var(--border);
            margin-bottom: 32px;
        }

        .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
        }
        .tag-list .tag {
            display: inline-block;
            background: #EDF4F3;
            color: var(--primary);
            font-size: 13px;
            font-weight: 500;
            padding: 5px 14px;
            border-radius: 999px;
            transition: var(--transition);
        }
        .tag-list .tag:hover {
            background: rgba(24, 184, 166, 0.14);
        }

        .share-list {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: var(--muted-color);
        }
        .share-list .social-btn {
            width: 34px;
            height: 34px;
            border-radius: 8px;
            background: #F0F7F6;
            color: var(--body-color);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            transition: var(--transition);
        }
        .share-list .social-btn:hover {
            background: var(--accent);
            color: #fff;
            transform: translateY(-1px);
        }

        .post-nav {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-top: 8px;
        }
        .post-nav-link {
            display: block;
            padding: 20px 24px;
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            transition: var(--transition);
        }
        .post-nav-link:hover {
            border-color: rgba(24, 184, 166, 0.45);
            box-shadow: var(--shadow-sm);
        }
        .post-nav-link .nav-label {
            font-size: 13px;
            color: var(--muted-color);
            display: flex;
            align-items: center;
            gap: 6px;
            margin-bottom: 6px;
        }
        .post-nav-link .nav-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--title-color);
            line-height: 1.5;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .post-nav-link:hover .nav-title {
            color: var(--accent-dark);
        }
        .post-nav-link.next {
            text-align: right;
        }
        .post-nav-link.next .nav-label {
            justify-content: flex-end;
        }

        /* ===== 相关推荐 ===== */
        .related-section {
            padding-bottom: 96px;
        }
        .related-section .section-header {
            text-align: left;
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            margin-bottom: 36px;
        }
        .related-section .section-header h2 {
            font-size: 28px;
        }
        .section-link {
            font-size: 14px;
            color: var(--accent-dark);
            font-weight: 500;
        }
        .section-link:hover {
            color: var(--accent);
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .related-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: var(--transition);
            display: block;
        }
        .related-card:hover {
            border-color: rgba(24, 184, 166, 0.4);
            box-shadow: var(--shadow-md);
        }
        .related-cover {
            aspect-ratio: 16 / 10;
            overflow: hidden;
        }
        .related-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.3s ease;
        }
        .related-card:hover .related-cover img {
            transform: scale(1.02);
        }
        .related-body {
            padding: 20px;
        }
        .related-body .badge {
            display: inline-block;
            background: rgba(24, 184, 166, 0.1);
            color: var(--accent-dark);
            font-size: 12px;
            font-weight: 600;
            padding: 3px 10px;
            border-radius: 999px;
            margin-bottom: 10px;
        }
        .related-body h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--title-color);
            line-height: 1.5;
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-body p {
            font-size: 14px;
            color: var(--muted-color);
            line-height: 1.7;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-date {
            display: block;
            margin-top: 14px;
            font-size: 13px;
            color: var(--muted-color);
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 0 0 96px;
        }
        .cta-box {
            background: linear-gradient(135deg, var(--primary), var(--primary-soft));
            border-radius: 20px;
            padding: 60px 48px;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .cta-box::before {
            content: "";
            position: absolute;
            top: -60px;
            right: -60px;
            width: 200px;
            height: 200px;
            border-radius: 50%;
            background: rgba(24, 184, 166, 0.15);
        }
        .cta-box::after {
            content: "";
            position: absolute;
            bottom: -40px;
            left: -40px;
            width: 120px;
            height: 120px;
            border-radius: 50%;
            background: rgba(234, 184, 106, 0.1);
        }
        .cta-box h2 {
            font-size: 28px;
            font-weight: 700;
            margin-bottom: 12px;
            position: relative;
            z-index: 1;
        }
        .cta-box p {
            color: rgba(255, 255, 255, 0.8);
            margin-bottom: 28px;
            position: relative;
            z-index: 1;
        }
        .cta-box .btn {
            position: relative;
            z-index: 1;
        }

        /* ===== 空状态 ===== */
        .article-empty-section {
            padding: 120px 24px;
        }
        .article-empty {
            max-width: 520px;
            margin: 0 auto;
            text-align: center;
            padding: 60px 40px;
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
        }
        .empty-icon {
            width: 72px;
            height: 72px;
            margin: 0 auto 24px;
            border-radius: 50%;
            background: #F0F9F7;
            color: var(--accent);
            font-size: 30px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .article-empty h2 {
            font-size: 24px;
            color: var(--title-color);
            margin-bottom: 10px;
        }
        .article-empty p {
            color: var(--muted-color);
            margin-bottom: 24px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--primary);
            color: rgba(255, 255, 255, 0.72);
            padding: 64px 0 0;
        }
        .footer-top {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 48px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }
        .footer-brand .logo {
            margin-bottom: 16px;
        }
        .footer-brand .logo .logo-icon {
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
        }
        .footer-brand .logo .logo-text {
            color: #fff;
            font-size: 20px;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.8;
            max-width: 300px;
            margin-bottom: 20px;
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-social a {
            width: 36px;
            height: 36px;
            border-radius: 8px;
            background: rgba(255, 255, 255, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255, 255, 255, 0.7);
            transition: var(--transition);
        }
        .footer-social a:hover {
            background: var(--accent);
            color: #fff;
            transform: translateY(-2px);
        }
        .footer-col h4 {
            color: #fff;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 18px;
            letter-spacing: 1px;
        }
        .footer-col ul {
            list-style: none;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul a {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            transition: var(--transition);
        }
        .footer-col ul a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.5);
            flex-wrap: wrap;
            gap: 10px;
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.5);
        }
        .footer-bottom a:hover {
            color: var(--accent);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .search-box {
                width: 180px;
            }
            .header-inner {
                gap: 16px;
            }
            .main-nav {
                gap: 18px;
            }
            .footer-top {
                grid-template-columns: 1fr 1fr 1fr;
            }
        }

        @media (max-width: 820px) {
            .section {
                padding: 72px 0;
            }
            .menu-toggle {
                display: flex;
                align-items: center;
                justify-content: center;
            }
            .main-nav {
                position: fixed;
                top: 72px;
                left: 0;
                right: 0;
                background: var(--bg);
                flex-direction: column;
                align-items: flex-start;
                padding: 24px;
                gap: 18px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-md);
                transform: translateY(-110%);
                opacity: 0;
                pointer-events: none;
                transition: var(--transition);
                z-index: 99;
            }
            .main-nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .main-nav .nav-link {
                font-size: 16px;
            }
            .header-actions .search-box {
                display: none;
            }
            .header-actions .btn-outline {
                display: none;
            }
            .header-actions .btn-primary {
                padding: 0 16px;
                font-size: 14px;
            }
            .article-banner h1 {
                font-size: 30px;
            }
            .related-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer-top {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
        }

        @media (max-width: 620px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .header-actions .btn-primary {
                width: 40px;
                height: 40px;
                padding: 0;
                font-size: 0;
                border-radius: 8px;
                background: var(--accent);
            }
            .header-actions .btn-primary::before {
                content: "\2B95";
                font-size: 16px;
            }
            .section {
                padding: 56px 0;
            }
            .section-header h2 {
                font-size: 26px;
            }
            .article-banner {
                padding: 44px 0 36px;
            }
            .article-banner h1 {
                font-size: 26px;
                line-height: 1.4;
            }
            .article-meta {
                gap: 12px;
                font-size: 13px;
            }
            .article-content {
                font-size: 15px;
            }
            .article-content h2 {
                font-size: 22px;
            }
            .article-content h3 {
                font-size: 18px;
            }
            .post-nav {
                grid-template-columns: 1fr;
            }
            .article-footer-line {
                flex-direction: column;
                align-items: flex-start;
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
            .cta-box {
                padding: 40px 24px;
            }
            .cta-box h2 {
                font-size: 22px;
            }
            .footer-top {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }