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

:root {
    --primary: #00897B;
    --primary-dark: #00695C;
    --primary-light: #E0F2F1;
    --accent: #F9A825;
    --accent-light: #FFF8E1;
    --bg: #FAFAFA;
    --dark: #1A237E;
    --text: #37474F;
    --text-light: #607D8B;
    --card: #FFFFFF;
    --border: #E0E0E0;
    --radius: 12px;
    --shadow: 0 2px 12px rgba(0,0,0,0.08);
    --shadow-hover: 0 6px 24px rgba(0,0,0,0.12);
}

body {
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    font-size: 16px;
}

/* Navigation */
.navbar {
    background: var(--card);
    box-shadow: 0 1px 8px rgba(0,0,0,0.06);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.nav-logo {
    font-size: 22px;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    letter-spacing: 1px;
}

.nav-logo span { color: var(--accent); }

.nav-menu {
    display: flex;
    list-style: none;
    gap: 6px;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text);
    padding: 8px 14px;
    border-radius: 8px;
    font-size: 15px;
    transition: all 0.3s;
    white-space: nowrap;
}

.nav-menu a:hover, .nav-menu a.active {
    background: var(--primary-light);
    color: var(--primary);
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
    padding: 8px;
}

.hamburger span {
    width: 24px;
    height: 2.5px;
    background: var(--text);
    border-radius: 2px;
    transition: 0.3s;
}

/* Hero */
.hero {
    background: linear-gradient(135deg, var(--primary) 0%, #00695C 60%, #004D40 100%);
    color: #fff;
    padding: 80px 20px;
    text-align: center;
}

.hero h1 {
    font-size: 42px;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: 1px;
}

.hero p {
    font-size: 18px;
    opacity: 0.92;
    max-width: 640px;
    margin: 0 auto 32px;
    line-height: 1.8;
}

.hero .slogan {
    font-size: 15px;
    opacity: 0.7;
    margin-top: 12px;
    letter-spacing: 3px;
}

/* Inner page hero */
.page-hero {
    background: linear-gradient(135deg, var(--primary) 0%, #00695C 100%);
    color: #fff;
    padding: 50px 20px 40px;
    text-align: center;
}

.page-hero h1 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 10px;
}

.page-hero p {
    font-size: 16px;
    opacity: 0.85;
    max-width: 600px;
    margin: 0 auto;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 14px 36px;
    border-radius: 50px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--accent);
    color: #1A237E;
}

.btn-primary:hover {
    background: #F57F17;
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(249,168,37,0.4);
}

.btn-outline {
    border: 2px solid #fff;
    color: #fff;
    background: transparent;
}

.btn-outline:hover {
    background: rgba(255,255,255,0.15);
}

.btn-green {
    background: var(--primary);
    color: #fff;
}

.btn-green:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0,137,123,0.3);
}

/* Section */
.section {
    padding: 60px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    margin-bottom: 40px;
}

.section-title h2 {
    font-size: 28px;
    color: var(--dark);
    margin-bottom: 8px;
    font-weight: 700;
}

.section-title p {
    color: var(--text-light);
    font-size: 15px;
}

.section-title::after {
    content: '';
    display: block;
    width: 48px;
    height: 3px;
    background: var(--accent);
    margin: 12px auto 0;
    border-radius: 2px;
}

/* Cards */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.card {
    background: var(--card);
    border-radius: var(--radius);
    padding: 30px 24px;
    box-shadow: var(--shadow);
    transition: all 0.3s;
    border: 1px solid var(--border);
}

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

.card-icon {
    width: 52px;
    height: 52px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 16px;
    background: var(--primary-light);
    color: var(--primary);
}

.card h3 {
    font-size: 18px;
    color: var(--dark);
    margin-bottom: 10px;
    font-weight: 600;
}

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

/* Stat cards */
.stat-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    max-width: 800px;
    margin: 0 auto;
}

.stat-card {
    background: var(--card);
    border-radius: var(--radius);
    padding: 28px 16px;
    text-align: center;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.stat-card .num {
    font-size: 36px;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 6px;
}

.stat-card .label {
    font-size: 14px;
    color: var(--text-light);
}

/* Category nav cards */
.cat-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 14px;
}

.cat-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 18px 14px;
    text-align: center;
    text-decoration: none;
    color: var(--text);
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s;
    display: block;
}

.cat-card:hover {
    border-color: var(--primary);
    background: var(--primary-light);
    color: var(--primary);
    transform: translateY(-2px);
}

.cat-card .cat-num {
    display: block;
    font-size: 22px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
}

/* Table */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    background: var(--card);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.data-table th {
    background: var(--primary);
    color: #fff;
    padding: 14px 16px;
    text-align: left;
    font-weight: 600;
    font-size: 14px;
}

.data-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
    font-size: 14px;
}

.data-table tr:nth-child(even) { background: #F5F5F5; }
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover { background: var(--primary-light); }

/* Info block */
.info-block {
    background: var(--card);
    border-radius: var(--radius);
    padding: 30px;
    margin: 20px 0;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
}

.info-block h3 {
    color: var(--dark);
    margin-bottom: 14px;
    font-size: 20px;
}

.info-block ul, .info-block ol {
    padding-left: 20px;
    margin: 10px 0;
}

.info-block li {
    margin-bottom: 8px;
    font-size: 15px;
    line-height: 1.7;
}

/* FAQ */
.faq-item {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 14px;
    overflow: hidden;
}

.faq-q {
    padding: 18px 24px;
    font-weight: 600;
    color: var(--dark);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 15px;
}

.faq-q::after {
    content: '+';
    font-size: 20px;
    color: var(--primary);
    font-weight: 700;
    transition: 0.3s;
}

.faq-item.open .faq-q::after {
    content: '-';
}

.faq-a {
    padding: 0 24px 18px;
    color: var(--text-light);
    font-size: 14px;
    line-height: 1.8;
    display: none;
}

.faq-item.open .faq-a { display: block; }

/* Timeline */
.timeline {
    position: relative;
    padding-left: 30px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--primary-light);
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    margin-bottom: 24px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -26px;
    top: 6px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--primary);
    border: 3px solid var(--primary-light);
}

.timeline-item h4 {
    color: var(--primary);
    font-size: 15px;
    margin-bottom: 4px;
}

.timeline-item p {
    font-size: 14px;
    color: var(--text-light);
}

/* Comparison table highlight */
.vs-good { color: var(--primary); font-weight: 600; }
.vs-badge {
    display: inline-block;
    background: var(--accent-light);
    color: #F57F17;
    font-size: 12px;
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 600;
}

/* Back link */
.back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--primary);
    text-decoration: none;
    font-size: 14px;
    margin-bottom: 20px;
    font-weight: 500;
}

.back-link:hover { text-decoration: underline; }

/* CTA section */
.cta-section {
    background: linear-gradient(135deg, var(--primary) 0%, #004D40 100%);
    color: #fff;
    text-align: center;
    padding: 60px 20px;
}

.cta-section h2 {
    font-size: 28px;
    margin-bottom: 12px;
    font-weight: 700;
}

.cta-section p {
    opacity: 0.85;
    margin-bottom: 28px;
    font-size: 16px;
}

/* Footer */
.footer {
    background: #263238;
    color: #B0BEC5;
    padding: 40px 20px 24px;
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 30px;
}

.footer h4 {
    color: #fff;
    font-size: 16px;
    margin-bottom: 14px;
}

.footer a {
    color: #B0BEC5;
    text-decoration: none;
    font-size: 14px;
    display: block;
    margin-bottom: 8px;
    transition: color 0.3s;
}

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

.footer-bottom {
    max-width: 1200px;
    margin: 30px auto 0;
    padding-top: 20px;
    border-top: 1px solid #37474F;
    text-align: center;
    font-size: 13px;
}

/* Contact info */
.contact-card {
    background: var(--card);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    text-align: center;
    margin-bottom: 20px;
}

.contact-card .icon {
    font-size: 36px;
    margin-bottom: 10px;
}

.contact-card h3 {
    font-size: 16px;
    color: var(--dark);
    margin-bottom: 6px;
}

.contact-card p {
    font-size: 14px;
    color: var(--text-light);
}

/* Breadcrumb */
.breadcrumb {
    max-width: 1200px;
    margin: 16px auto 0;
    padding: 0 20px;
    font-size: 13px;
    color: var(--text-light);
}

.breadcrumb a {
    color: var(--primary);
    text-decoration: none;
}

.breadcrumb a:hover { text-decoration: underline; }

/* Responsive */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--card);
        flex-direction: column;
        padding: 16px;
        box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        gap: 4px;
    }
    .nav-menu.open { display: flex; }
    .hamburger { display: flex; }
    .hero h1 { font-size: 28px; }
    .hero p { font-size: 15px; }
    .hero { padding: 50px 20px; }
    .page-hero h1 { font-size: 24px; }
    .stat-grid { grid-template-columns: 1fr; gap: 14px; }
    .card-grid { grid-template-columns: 1fr; }
    .cat-grid { grid-template-columns: repeat(2, 1fr); }
    .section { padding: 40px 16px; }
    .section-title h2 { font-size: 22px; }
    .data-table { font-size: 13px; }
    .data-table th, .data-table td { padding: 10px 12px; }
    .footer-inner { grid-template-columns: 1fr; gap: 20px; }
    .info-block { padding: 20px; }
}