/* === AI家AI户 - 主样式表 === */

:root {
    --primary: #0ea5e9;
    --primary-dark: #0284c7;
    --primary-light: #e0f2fe;
    --accent-green: #10b981;
    --accent-orange: #f59e0b;
    --accent-red: #ef4444;
    --text: #1e293b;
    --text-secondary: #64748b;
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --border: #e2e8f0;
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
    --radius: 10px;
    --radius-sm: 6px;
    --max-width: 1100px;
}

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

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

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }

/* === 导航栏 === */
.nav {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: 0 24px;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}
.nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}
.nav-logo {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 8px;
}
.nav-logo:hover { color: var(--primary-dark); }
.nav-links { display: flex; gap: 32px; list-style: none; }
.nav-links a {
    color: var(--text-secondary);
    font-size: 15px;
    font-weight: 500;
    transition: color 0.2s;
    padding: 8px 0;
    border-bottom: 2px solid transparent;
}
.nav-links a:hover, .nav-links a.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

/* === 页面容器 === */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 32px 24px;
}

/* === Hero区域 === */
.hero {
    text-align: center;
    padding: 64px 24px 48px;
    background: linear-gradient(135deg, #e0f2fe 0%, #f0f9ff 50%, #ecfdf5 100%);
}
.hero h1 {
    font-size: 36px;
    font-weight: 800;
    margin-bottom: 12px;
    color: var(--text);
}
.hero h1 span { color: var(--primary); }
.hero p {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 28px;
}
.hero-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    margin-top: 12px;
}
.hero-stat {
    text-align: center;
}
.hero-stat .number {
    font-size: 28px;
    font-weight: 800;
    color: var(--primary);
}
.hero-stat .label {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 2px;
}

/* === 搜索框 === */
.search-box {
    max-width: 520px;
    margin: 0 auto;
    position: relative;
}
.search-box input {
    width: 100%;
    padding: 14px 48px 14px 18px;
    border: 2px solid var(--border);
    border-radius: 50px;
    font-size: 16px;
    outline: none;
    transition: border-color 0.2s;
    background: var(--card-bg);
}
.search-box input:focus { border-color: var(--primary); }
.search-box .search-icon {
    position: absolute;
    right: 18px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    font-size: 18px;
}

/* === 分类筛选 === */
.filters {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin: 24px 0;
}
.filter-btn {
    padding: 8px 18px;
    border: 1px solid var(--border);
    border-radius: 50px;
    background: var(--card-bg);
    cursor: pointer;
    font-size: 14px;
    color: var(--text-secondary);
    transition: all 0.2s;
    font-family: inherit;
}
.filter-btn:hover { border-color: var(--primary); color: var(--primary); }
.filter-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

/* === 模型卡片 === */
.model-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 20px;
}
.model-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow);
    transition: box-shadow 0.2s, transform 0.2s;
    cursor: pointer;
}
.model-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}
.model-card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 12px;
}
.model-name {
    font-size: 20px;
    font-weight: 700;
}
.model-company {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 2px;
}
.model-badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 50px;
    font-size: 12px;
    font-weight: 600;
}
.badge-free { background: #d1fae5; color: #065f46; }
.badge-freemium { background: #fef3c7; color: #92400e; }
.badge-paid { background: #fee2e2; color: #991b1b; }

.model-tags {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    margin: 10px 0;
}
.model-tag {
    padding: 3px 10px;
    background: var(--primary-light);
    color: var(--primary-dark);
    border-radius: 50px;
    font-size: 12px;
    font-weight: 500;
}
.model-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 10px 0;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.model-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 16px;
    padding-top: 14px;
    border-top: 1px solid var(--border);
}
.model-price {
    font-size: 14px;
    color: var(--text-secondary);
}
.model-price strong { color: var(--text); font-size: 16px; }
.model-link {
    padding: 7px 16px;
    background: var(--primary);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    transition: background 0.2s;
}
.model-link:hover { background: var(--primary-dark); color: white; }

/* === 对比表 === */
.compare-section { margin-bottom: 40px; }
.compare-section h2 {
    font-size: 24px;
    margin-bottom: 16px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary);
}
.compare-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}
.compare-table th, .compare-table td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    font-size: 14px;
}
.compare-table th {
    background: #f1f5f9;
    font-weight: 700;
    color: var(--text);
    font-size: 13px;
    white-space: nowrap;
}
.compare-table tr:last-child td { border-bottom: none; }
.compare-table td:first-child { font-weight: 600; color: var(--text); }
.compare-check { color: var(--accent-green); font-weight: 700; }
.compare-cross { color: #cbd5e1; }
.compare-note { font-size: 12px; color: var(--text-secondary); }

/* === 关于页 === */
.about-section {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow);
    margin-bottom: 24px;
}
.about-section h2 {
    font-size: 20px;
    margin-bottom: 12px;
}
.about-section p, .about-section ul {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.8;
}
.about-section ul { padding-left: 20px; }
.about-section ul li { margin-bottom: 6px; }

/* === 页脚 === */
.footer {
    text-align: center;
    padding: 32px 24px;
    color: var(--text-secondary);
    font-size: 13px;
    border-top: 1px solid var(--border);
    margin-top: 48px;
}
.footer a { color: var(--text-secondary); }
.footer a:hover { color: var(--primary); }

/* === 响应式 === */
@media (max-width: 768px) {
    .hero h1 { font-size: 26px; }
    .hero p { font-size: 15px; }
    .hero-stats { gap: 24px; flex-wrap: wrap; }
    .model-grid { grid-template-columns: 1fr; }
    .compare-table { font-size: 12px; display: block; overflow-x: auto; }
    .nav-links { gap: 16px; }
    .container { padding: 20px 16px; }
}