/* ========================================
   年龄计算器 - 主样式表
   设计风格：现代简约 + 卡片式布局
   版本: 2.0.0 - SEO增强版
   ======================================== */

:root {
    --primary: #4f46e5;
    --primary-light: #818cf8;
    --primary-dark: #3730a3;
    --accent: #f59e0b;
    --success: #10b981;
    --danger: #ef4444;
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --text: #1e293b;
    --text-secondary: #64748b;
    --border: #e2e8f0;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
    --radius: 16px;
    --radius-sm: 10px;
    --transition: 0.2s ease;
}

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

/* 性能优化：字体加载不阻塞渲染 */
@font-face {
    font-family: 'System-UI';
    src: local('-apple-system'), local('BlinkMacSystemFont'), local('Segoe UI'), local('PingFang SC'), local('Microsoft YaHei');
    font-display: swap;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
    font-display: swap;
    background: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 50%, #f0f4ff 100%);
    background-attachment: fixed;
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
    /* 性能优化 */
    content-visibility: auto;
    contain-intrinsic-size: auto 500px;
}

/* ===== 头部导航 ===== */
.toolbar {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: 0 20px;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.toolbar-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    gap: 4px;
    overflow-x: auto;
    padding: 8px 0;
    -webkit-overflow-scrolling: touch;
}

.toolbar-inner a {
    display: inline-flex;
    align-items: center;
    padding: 8px 14px;
    border-radius: 20px;
    font-size: 13px;
    color: var(--text-secondary);
    text-decoration: none;
    white-space: nowrap;
    transition: all var(--transition);
    font-weight: 500;
}

.toolbar-inner a:hover,
.toolbar-inner a.active {
    background: var(--primary);
    color: #fff;
}

/* ===== 主容器 ===== */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px 16px 40px;
}

/* ===== 头部标题区 ===== */
.header {
    text-align: center;
    padding: 30px 0 20px;
}

.header h1 {
    font-size: 32px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.header .subtitle {
    color: var(--text-secondary);
    font-size: 15px;
}

/* ===== 评分 ===== */
.rating {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 12px;
    font-size: 14px;
    color: var(--text-secondary);
}

.rating .stars {
    color: var(--accent);
    font-size: 18px;
    letter-spacing: 2px;
}

.rating .score {
    font-weight: 700;
    color: var(--accent);
    font-size: 16px;
}

/* ===== 计算卡片 ===== */
.calc-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 28px 24px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
    transition: box-shadow var(--transition);
}

.calc-card:hover {
    box-shadow: var(--shadow-lg);
}

.calc-card h2 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 8px;
}

.calc-card h2 .icon {
    font-size: 24px;
}

/* ===== 输入区 ===== */
.input-row {
    display: flex;
    gap: 16px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.input-group {
    flex: 1;
    min-width: 200px;
}

.input-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.input-group input,
.input-group select {
    width: 100%;
    padding: 12px 14px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 15px;
    color: var(--text);
    background: var(--bg);
    transition: all var(--transition);
    outline: none;
    font-family: inherit;
}

.input-group input:focus,
.input-group select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79,70,229,0.1);
    background: #fff;
}

.btn-row {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 12px 28px;
    border: none;
    border-radius: 30px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: #fff;
    box-shadow: 0 4px 12px rgba(79,70,229,0.3);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(79,70,229,0.4);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

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

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

/* ===== 结果展示区 ===== */
.results {
    margin-top: 24px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 14px;
}

.result-item {
    background: var(--bg);
    border-radius: var(--radius-sm);
    padding: 16px 18px;
    border: 1px solid var(--border);
    transition: all var(--transition);
}

.result-item:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-sm);
}

.result-item .label {
    font-size: 12px;
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 6px;
}

.result-item .value {
    font-size: 22px;
    font-weight: 800;
    color: var(--text);
}

.result-item .value.highlight {
    color: var(--primary);
    font-size: 28px;
}

.result-item .desc {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.result-item.full-width {
    grid-column: 1 / -1;
}

/* ===== 特殊工具区 ===== */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 14px;
    margin-top: 16px;
}

.tool-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 18px;
    cursor: pointer;
    transition: all var(--transition);
}

.tool-card:hover {
    border-color: var(--primary-light);
    background: #f5f3ff;
    transform: translateY(-2px);
}

.tool-card h4 {
    font-size: 15px;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--text);
}

.tool-card p {
    font-size: 12px;
    color: var(--text-secondary);
}

.tool-card .tool-result {
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px dashed var(--border);
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
}

/* ===== 页脚 ===== */
.footer {
    text-align: center;
    padding: 30px 20px;
    color: var(--text-secondary);
    font-size: 13px;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
    margin-bottom: 12px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition);
}

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

/* ===== 面包屑 ===== */
.breadcrumb {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    align-items: center;
}

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

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

.breadcrumb span.sep {
    color: var(--border);
}

/* ===== 内链相关推荐 ===== */
.related-links {
    margin-top: 20px;
}

.related-links h3 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 12px;
}

.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 10px;
}

.related-grid a {
    display: block;
    padding: 10px 14px;
    background: var(--bg);
    border-radius: var(--radius-sm);
    color: var(--text);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    transition: all var(--transition);
    border: 1px solid transparent;
}

.related-grid a:hover {
    border-color: var(--primary-light);
    color: var(--primary);
}

/* ===== 打印样式 ===== */
@media print {
    body { background: #fff; }
    .toolbar, .btn-row, .related-grid, .footer-links { display: none; }
    .calc-card { box-shadow: none; border: 1px solid #ddd; }
}

/* ===== 响应式 ===== */
@media (max-width: 640px) {
    .header h1 { font-size: 24px; }
    .input-row { flex-direction: column; gap: 12px; }
    .results { grid-template-columns: 1fr 1fr; gap: 10px; }
    .result-item { padding: 12px 14px; }
    .result-item .value { font-size: 18px; }
    .result-item .value.highlight { font-size: 22px; }
    .calc-card { padding: 20px 16px; }
    .btn { padding: 10px 20px; font-size: 14px; }
}

/* ===== SEO增强：信息表格 ===== */
.info-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
    margin: 12px 0;
}

.info-table th,
.info-table td {
    padding: 10px 12px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.info-table th {
    background: var(--bg);
    font-weight: 700;
    color: var(--text);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.info-table tr:hover td {
    background: #f8faff;
}

.info-table .highlight-row {
    background: #eef2ff;
}

/* ===== SEO增强：内容区块 ===== */
.content-block {
    font-size: 14px;
    line-height: 1.9;
    color: var(--text-secondary);
}

.content-block h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
}

.content-block p {
    margin-bottom: 12px;
}

.content-block ul {
    padding-left: 20px;
    margin-bottom: 12px;
}

.content-block li {
    margin-bottom: 6px;
}

.content-block strong {
    color: var(--text);
    font-weight: 600;
}

/* ===== SEO增强：卡片内表格容器 ===== */
.table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin: 8px -4px;
}

.table-wrap table {
    min-width: 500px;
}

/* ===== SEO增强：标签/徽章 ===== */
.tag {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
    background: #eef2ff;
    color: var(--primary);
    margin: 2px 4px 2px 0;
}

.tag-accent { background: #fef3c7; color: #92400e; }
.tag-success { background: #d1fae5; color: #065f46; }
.tag-danger { background: #fee2e2; color: #991b1b; }

/* ===== SEO增强：引用块 ===== */
blockquote.info-note {
    background: #f0f9ff;
    border-left: 4px solid var(--primary);
    padding: 14px 18px;
    margin: 16px 0;
    border-radius: 4px;
    font-size: 13px;
    color: var(--text-secondary);
}

blockquote.info-note strong {
    color: var(--primary);
}

/* ===== SEO增强：内容卡片内图片占位 ===== */
.content-img-placeholder {
    background: linear-gradient(135deg, #eef2ff, #e0e7ff);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 120px;
    font-size: 48px;
    margin: 12px 0;
}

/* ===== 响应式增强 ===== */
@media (max-width: 480px) {
    .results { grid-template-columns: 1fr; }
    .result-item { padding: 10px 12px; }
    .result-item .value { font-size: 16px; }
    .result-item .value.highlight { font-size: 20px; }
    .header h1 { font-size: 22px; }
    .calc-card { padding: 16px 12px; }
    .toolbar-inner a { padding: 6px 10px; font-size: 12px; }
    .content-block { font-size: 13px; }
}

/* 暗色模式（可选） */
@media (prefers-color-scheme: dark) {
    /* 默认保持浅色主题，如需暗色可取消注释 */
    /*
    :root {
        --bg: #0f172a;
        --card-bg: #1e293b;
        --text: #e2e8f0;
        --text-secondary: #94a3b8;
        --border: #334155;
    }
    body { background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%); }
    */
}

/* 无障碍：减少动画（用户偏好） */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    html { scroll-behavior: auto; }
}