:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --primary-color: #667eea;
    --primary-light: #8b9dc3;
    --bg-primary: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 50%, #f1f5f9 100%);
    --bg-secondary: #ffffff;
    --bg-card: rgba(255, 255, 255, 0.95);
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --border-color: rgba(102, 126, 234, 0.15);
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.08);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: "Inter", "Noto Sans SC", -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    min-height: 100vh;
    color: var(--text-primary);
    line-height: 1.6;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; height: auto; }

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}
.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}
.logo img { height: 40px; }
.nav-menu { display: flex; gap: 8px; }
.nav-link {
    padding: 10px 18px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}
.nav-link:hover, .nav-link.active {
    color: var(--primary-color);
    background: rgba(102, 126, 234, 0.1);
}

.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 120px 24px 80px;
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 25%, #f0f9ff 50%, #f8fafc 75%, #f1f5f9 100%);
    position: relative;
}
.hero::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 20% 80%, rgba(102, 126, 234, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(118, 75, 162, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(6, 182, 212, 0.06) 0%, transparent 40%),
        radial-gradient(circle at 60% 60%, rgba(99, 102, 241, 0.05) 0%, transparent 45%);
}
.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
}
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(102, 126, 234, 0.1);
    border: 1px solid rgba(102, 126, 234, 0.3);
    border-radius: 100px;
    font-size: 14px;
    color: var(--primary-color);
    margin-bottom: 32px;
}
.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--primary-color);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.2); }
}
.hero-title {
    font-size: clamp(40px, 8vw, 72px);
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 24px;
    color: var(--text-primary);
}
.gradient-text {
    display: block;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.hero-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 48px;
}
.hero-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}
.stat-item { text-align: center; }
.stat-number {
    display: block;
    font-size: 36px;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.stat-label { font-size: 14px; color: var(--text-muted); }

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 16px;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: var(--transition-normal);
    cursor: pointer;
    border: none;
}
.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
}

.section {
    padding: 100px 24px;
    max-width: 1400px;
    margin: 0 auto;
}
.section-header {
    text-align: center;
    margin-bottom: 64px;
}
.section-tag {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(102, 126, 234, 0.1);
    border: 1px solid rgba(102, 126, 234, 0.3);
    border-radius: 100px;
    font-size: 12px;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 16px;
}
.section-title {
    font-size: clamp(32px, 5vw, 48px);
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}
.section-desc {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.platform-tabs {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}
.tab-btn {
    padding: 12px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-fast);
}
.tab-btn:hover {
    background: rgba(102, 126, 234, 0.1);
    color: var(--primary-color);
}
.tab-btn.active {
    background: var(--primary-gradient);
    border-color: transparent;
    color: white;
}
.tab-panel { display: none; }
.tab-panel.active { display: block; }

.platform-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}
.platform-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    transition: var(--transition-normal);
    box-shadow: var(--shadow-sm);
}
.platform-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
    border-color: rgba(102, 126, 234, 0.4);
}
.platform-card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}
.platform-icon {
    width: 48px;
    height: 48px;
    background: var(--primary-gradient);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    font-weight: 700;
    color: white;
}
.platform-title { font-size: 16px; font-weight: 600; color: var(--text-primary); }
.platform-category { font-size: 12px; color: var(--text-muted); }
.platform-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    margin-top: 16px;
    font-size: 14px;
    color: var(--primary-color);
    font-weight: 500;
}

.query-grid, .tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 16px;
}
.query-card, .tool-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
    box-shadow: var(--shadow-sm);
}
.query-card:hover, .tool-card:hover {
    border-color: rgba(102, 126, 234, 0.4);
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}
.query-card-icon, .tool-icon {
    width: 40px;
    height: 40px;
    background: rgba(102, 126, 234, 0.1);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
    font-size: 18px;
}
.query-card-title, .tool-name { font-size: 14px; font-weight: 500; color: var(--text-primary); }

.laws-container {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 32px;
}
.laws-sidebar { position: sticky; top: 100px; height: fit-content; }
.search-box {
    position: relative;
    margin-bottom: 20px;
}
.search-box input {
    width: 100%;
    padding: 14px 16px 14px 48px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 14px;
}
.laws-categories { display: flex; flex-direction: column; gap: 8px; }
.law-cat-btn {
    padding: 12px 16px;
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 14px;
    text-align: left;
    cursor: pointer;
    transition: var(--transition-fast);
}
.law-cat-btn:hover { background: rgba(102, 126, 234, 0.1); color: var(--primary-color); }
.law-cat-btn.active { background: var(--primary-gradient); color: white; }
.laws-list { display: flex; flex-direction: column; gap: 12px; }
.law-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    text-decoration: none;
}
.law-item:hover {
    border-color: rgba(102, 126, 234, 0.4);
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
}
.law-icon { width: 44px; height: 44px; background: rgba(102, 126, 234, 0.1); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; color: var(--primary-color); font-size: 20px; }
.law-info { flex: 1; }
.law-title { font-size: 15px; font-weight: 500; color: var(--text-primary); margin-bottom: 4px; }
.law-meta { font-size: 12px; color: var(--text-muted); }
.law-badge { padding: 4px 10px; background: rgba(102, 126, 234, 0.1); border-radius: 100px; font-size: 12px; color: var(--primary-color); }

.footer {
    background: linear-gradient(135deg, #f8fafc 0%, #e2e8f0 50%, #f1f5f9 100%);
    border-top: 1px solid var(--border-color);
    padding: 64px 24px 32px;
    color: var(--text-primary);
}
.footer-content { max-width: 1400px; margin: 0 auto; }
.footer-main {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 64px;
    margin-bottom: 48px;
}
.footer-brand { max-width: 300px; }
.footer-logo { height: 40px; margin-bottom: 16px; }
.footer-brand p { color: var(--text-secondary); font-size: 14px; line-height: 1.7; }
.footer-column h4 { font-size: 14px; font-weight: 600; margin-bottom: 20px; color: var(--text-primary); }
.footer-column ul { display: flex; flex-direction: column; gap: 12px; }
.footer-column a { font-size: 14px; color: var(--text-secondary); transition: var(--transition-fast); }
.footer-column a:hover { color: var(--primary-color); }

.footer-social-section {
    display: flex;
    align-items: center;
    gap: 16px;
    margin: 24px 0;
}
.footer-social-text {
    font-size: 14px;
    color: var(--text-secondary);
}
.social-icons {
    display: flex;
    gap: 12px;
}
.social-icon {
    width: 40px;
    height: 40px;
    background: rgba(102, 126, 234, 0.1);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}
.social-icon:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
}
.social-icon img { width: 24px; height: 24px; object-fit: contain; }

.footer-bottom {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding-top: 32px;
    border-top: 1px solid var(--border-color);
}
.footer-beian {
    display: flex;
    gap: 24px;
    font-size: 13px;
    color: var(--text-muted);
}
.footer-beian a {
    color: var(--text-muted);
    transition: var(--transition-fast);
}
.footer-beian a:hover {
    color: var(--primary-color);
}
.footer-copyright {
    font-size: 14px;
    color: var(--text-secondary);
}

@media (max-width: 1024px) {
    .laws-container { grid-template-columns: 1fr; }
    .footer-main { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
    .nav-menu { display: none; }
    .hamburger { display: flex; }
    .platform-tabs { flex-direction: column; }
    .footer-main { grid-template-columns: 1fr; }
    .footer-beian { flex-direction: column; gap: 8px; text-align: center; }
}