/* ============================================================
   seo.7x0.cn 全站统一主题 V2
   与首页 index.html 完全一致的设计系统（配色/字号/圆角/阴影/暗色模式）
   ============================================================ */

/* ============ CSS Variables ============ */
:root {
    --primary: #6366f1;
    --primary-light: #818cf8;
    --primary-dark: #4f46e5;
    --primary-bg: #eef2ff;
    --success: #10b981;
    --success-bg: #d1fae5;
    --warning: #f59e0b;
    --warning-bg: #fef3c7;
    --danger: #ef4444;
    --danger-bg: #fee2e2;
    --info: #3b82f6;
    --info-bg: #dbeafe;

    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 20px;
}

[data-theme="dark"] {
    --primary: #818cf8;
    --primary-light: #a5b4fc;
    --primary-dark: #6366f1;
    --primary-bg: #312e81;
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #64748b;
    --border-color: #334155;
    --border-light: #1e293b;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.5);
}

* { box-sizing: border-box; }

html {
    scroll-behavior: smooth;
    scroll-padding-top: 88px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--primary-dark); }
[data-theme="dark"] a:hover { color: var(--primary-light); }

/* ============ Layout ============ */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ============ Header ============ */
.app-header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background: rgba(255,255,255,0.85);
}

[data-theme="dark"] .app-header {
    background: rgba(30, 41, 59, 0.85);
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    flex-shrink: 0;
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 20px;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 4px;
}

.header-nav a {
    padding: 8px 14px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

.header-nav a:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.header-nav a.active {
    background: var(--primary-bg);
    color: var(--primary-dark);
}

[data-theme="dark"] .header-nav a.active { color: var(--primary-light); }

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.theme-toggle {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    background: var(--bg-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 20px;
    transition: all 0.2s;
}
.theme-toggle:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* ============ Main Content ============ */
.main-content {
    flex: 1;
    max-width: 1280px;
    width: 100%;
    margin: 0 auto;
    padding: 32px 24px;
}

/* ============ Hero ============ */
.hero-section {
    text-align: center;
    padding: 32px 0 24px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: var(--primary-bg);
    color: var(--primary-dark);
    border-radius: 999px;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 16px;
}
[data-theme="dark"] .hero-badge {
    background: var(--primary-bg);
    color: var(--primary-light);
}

.hero-title {
    font-size: 36px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 12px;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    max-width: 620px;
    margin: 0 auto;
}

/* ============ Footer ============ */
.app-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 24px;
    text-align: center;
    color: var(--text-tertiary);
    font-size: 13px;
}

.footer-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 24px;
    margin-bottom: 12px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}
.footer-links a:hover { color: var(--primary); }

/* ============================================================
   Tailwind 桥接层：把旧页面的 Tailwind 工具类映射到 V2 设计变量
   （选择器加 body 前缀提升优先级，稳定覆盖 Tailwind CDN 输出）
   ============================================================ */
body .bg-white       { background: var(--bg-secondary); }
body .bg-gray-50     { background: var(--bg-tertiary); }
body .bg-gray-100    { background: var(--bg-tertiary); }
body .bg-gray-800    { background: var(--bg-tertiary); }
body .bg-gray-900    { background: #0f172a; }
[data-theme="dark"] body .bg-gray-900 { background: #020617; }
body .bg-blue-50     { background: var(--primary-bg); }
body .bg-green-50    { background: var(--success-bg); }
body .bg-orange-50   { background: var(--warning-bg); }
body .bg-red-50      { background: var(--danger-bg); }
body .bg-cyan-100    { background: var(--info-bg); }
body .bg-purple-100  { background: var(--primary-bg); }

body .text-dark      { color: var(--text-primary); }
body .text-gray-400,
body .text-gray-500  { color: var(--text-tertiary); }
body .text-gray-600,
body .text-gray-700  { color: var(--text-secondary); }
body .text-primary   { color: var(--primary); }
body .text-success   { color: var(--success); }
body .text-warning   { color: var(--warning); }
body .text-danger    { color: var(--danger); }
body .text-blue-100  { color: var(--text-secondary); }
body .text-purple-600,
body .text-cyan-600  { color: var(--primary); }
body .text-purple-500,
body .text-cyan-500  { color: var(--info); }
body .text-green-500 { color: var(--success); }
body .text-orange-500,
body .text-red-500   { color: var(--warning); }

body .border-gray-100,
body .border-gray-200 { border-color: var(--border-color); }
body .border-gray-800 { border-color: var(--border-color); }
body .border-primary  { border-color: var(--primary); }
body .border-success  { border-color: var(--success); }
body .border-warning  { border-color: var(--warning); }
body .border-danger   { border-color: var(--danger); }

body .card-shadow {
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

body .rounded-xl { border-radius: var(--radius-lg); }
body .rounded-lg { border-radius: var(--radius-md); }

/* 行内代码 / 代码块 */
code {
    font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
}
body code.bg-gray-100 {
    background: var(--bg-tertiary);
    color: var(--primary-dark);
    border-radius: 4px;
    padding: 1px 5px;
    font-size: 0.9em;
}
[data-theme="dark"] body code.bg-gray-100 { color: var(--primary-light); }

body pre {
    border-radius: var(--radius-md);
    border: 1px solid #1e293b;
    font-size: 12.5px;
    line-height: 1.7;
}
body pre code { background: transparent !important; color: #e2e8f0; }

/* 标题层级 */
body h2.text-2xl { font-size: 22px; font-weight: 800; color: var(--text-primary); }
body h3 { color: var(--text-primary); }

/* 列表 */
body ul.list-disc { padding-left: 20px; }
body ul.list-disc li { margin-bottom: 4px; }
body .leading-relaxed { line-height: 1.7; }

/* ============================================================
   内容页组件
   ============================================================ */

/* 目录卡片 */
.toc-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 88px;
}

.toc-title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.toc-link {
    display: block;
    padding: 6px 10px;
    margin: 2px 0;
    border-left: 2px solid transparent;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-size: 13px;
    color: var(--text-secondary);
    transition: all 0.2s;
}
.toc-link:hover {
    color: var(--primary);
    background: var(--bg-tertiary);
    transform: translateX(2px);
}
.toc-link.active {
    color: var(--primary-dark);
    font-weight: 600;
    border-left-color: var(--primary);
    background: var(--primary-bg);
}
[data-theme="dark"] .toc-link.active { color: var(--primary-light); }

/* 提示框 */
.info-box {
    background: var(--primary-bg);
    border-left: 4px solid var(--primary);
    border-radius: var(--radius-sm);
    padding: 12px 14px;
    font-size: 14px;
    color: var(--text-secondary);
}
[data-theme="dark"] .info-box { color: var(--text-secondary); }

.err-box {
    background: var(--danger-bg);
    border-left: 4px solid var(--danger);
    border-radius: var(--radius-sm);
    padding: 12px 14px;
    font-size: 14px;
    color: var(--text-secondary);
}
[data-theme="dark"] .err-box { color: var(--text-secondary); }

.ok-box {
    background: var(--success-bg);
    border-left: 4px solid var(--success);
    border-radius: var(--radius-sm);
    padding: 12px 14px;
    font-size: 14px;
    color: var(--text-secondary);
}

/* 特性网格 */
.feature-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}
.feature-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
}
.feature-icon.indigo  { background: var(--primary-bg); color: var(--primary); }
.feature-icon.green   { background: var(--success-bg); color: var(--success); }
.feature-icon.amber   { background: var(--warning-bg); color: var(--warning); }
.feature-icon.red     { background: var(--danger-bg);  color: var(--danger); }
.feature-icon.blue    { background: var(--info-bg);    color: var(--info); }
[data-theme="dark"] .feature-icon.indigo { color: var(--primary-light); }
.feature-title { font-weight: 700; color: var(--text-primary); margin-bottom: 2px; }
.feature-desc  { font-size: 13px; color: var(--text-secondary); }

/* 步骤 */
.step-num {
    width: 32px;
    height: 32px;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 14px;
    flex-shrink: 0;
}

/* 数据表格 */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}
.data-table th,
.data-table td {
    padding: 10px 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-light);
}
.data-table thead th {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 12px;
}
.data-table tbody tr:hover { background: var(--bg-tertiary); }

/* 等级卡片 */
.grade-box {
    border-radius: var(--radius-md);
    padding: 12px;
    text-align: center;
    border: 1px solid;
}
.grade-box.good { background: var(--success-bg); border-color: var(--success); }
.grade-box.mid  { background: var(--warning-bg); border-color: var(--warning); }
.grade-box.bad  { background: var(--danger-bg);  border-color: var(--danger); }
.grade-num  { font-size: 20px; font-weight: 800; }
.grade-box.good .grade-num { color: var(--success); }
.grade-box.mid  .grade-num { color: var(--warning); }
.grade-box.bad  .grade-num { color: var(--danger); }
.grade-label { font-size: 13px; color: var(--text-secondary); margin-top: 2px; }

/* 联系方式卡片 */
.contact-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    font-size: 20px;
    color: var(--primary);
}
[data-theme="dark"] .contact-card { color: var(--primary-light); }
.contact-label { font-size: 12px; color: var(--text-tertiary); }
.contact-value { font-weight: 600; color: var(--text-primary); font-size: 14px; }

/* 主按钮 */
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
    font-weight: 600;
    font-size: 15px;
    box-shadow: var(--shadow-md);
    transition: transform 0.2s, box-shadow 0.2s;
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: var(--shadow-lg); color: #fff; }

/* 上下页导航 */
.page-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    padding-top: 24px;
}
.page-nav a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 500;
}

/* ============ 404 ============ */
.error-wrap {
    max-width: 560px;
    margin: 0 auto;
    text-align: center;
    padding: 60px 24px 80px;
}
.error-code {
    font-size: 96px;
    font-weight: 800;
    line-height: 1;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}
.error-title { font-size: 22px; font-weight: 700; color: var(--text-primary); margin-bottom: 8px; }
.error-desc  { font-size: 15px; color: var(--text-secondary); margin-bottom: 28px; }
.error-actions { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }

/* ============ Responsive ============ */
@media (max-width: 900px) {
    .header-nav { display: none; }
}
@media (max-width: 640px) {
    .app-header { padding: 0 16px; }
    .main-content { padding: 20px 16px; }
    .hero-title { font-size: 26px; }
    .hero-section { padding: 20px 0 12px; }
    .toc-card { position: static; }
    .error-code { font-size: 72px; }
}

/* 图标垂直对齐 */
iconify-icon { vertical-align: -0.125em; }

/* 章节标题图标 */
.card-shadow > h2 iconify-icon,
.section-title iconify-icon {
    color: var(--primary);
    margin-right: 8px;
    font-size: 22px;
}
[data-theme="dark"] .card-shadow > h2 iconify-icon { color: var(--primary-light); }

.toc-title iconify-icon {
    color: var(--primary);
    font-size: 18px;
}
[data-theme="dark"] .toc-title iconify-icon { color: var(--primary-light); }

/* 侧栏/底部导航图标 */
.page-nav iconify-icon { font-size: 18px; }