/* ============================================
   共享基础样式 - Google & Baidu Spider Checker
   CSS 变量、重置、通用组件
   ============================================ */

/* 基础重置 */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #1a73e8;
    --primary-dark: #1557b0;
    --accent: #4a6cf7;
    --accent-dark: #3955d8;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --bg: #f0f2f5;
    --card-bg: #ffffff;
    --text: #1f2937;
    --text-muted: #6b7280;
    --border: #e5e7eb;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    --font-mono: "SF Mono", "Fira Code", "Consolas", monospace;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 20px;
}

/* 通用链接 */
a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.back-link {
    display: inline-block;
    margin-bottom: 16px;
    color: var(--accent);
    font-size: 0.9rem;
}

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

.card h2 {
    font-size: 1.2rem;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

/* 按钮 */
.btn {
    display: inline-block;
    padding: 10px 24px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
    background: var(--accent);
    color: #fff;
    font-family: inherit;
}

.btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-primary { background: var(--accent); }
.btn-primary:hover { background: var(--accent-dark); }

.btn-danger { background: var(--error); }
.btn-danger:hover { background: #dc2626; }

.btn-sm {
    padding: 6px 14px;
    font-size: 0.82rem;
    border-radius: 6px;
}

/* 导航链接按钮 */
.nav-links {
    text-align: center;
    margin-bottom: 16px;
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

.nav-links .btn {
    font-size: 0.85rem;
    text-decoration: none;
}

.btn-google {
    background: #1a73e8;
}

.btn-google:hover {
    background: #1557b0;
}

.btn-bing {
    background: #0078d4;
}

.btn-bing:hover {
    background: #106ebe;
}

/* 徽章 */
.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.badge-spider { background: #fef3c7; color: #b45309; }
.badge-success { background: #d1fae5; color: #065f46; }
.badge-warning { background: #fef3c7; color: #92400e; }
.badge-no { background: #f3f4f6; color: #6b7280; }
.badge-error { background: #fee2e2; color: #991b1b; }
.badge-v4 { background: #dbeafe; color: #1d4ed8; }
.badge-v6 { background: #fef3c7; color: #b45309; }

/* 页脚 */
.footer {
    text-align: center;
    padding: 20px;
    color: var(--text-muted);
    font-size: 0.8rem;
}

.footer-copy {
    margin-top: 8px;
    font-size: 0.78rem;
}

.footer-copy a {
    color: var(--text-muted);
    font-weight: 600;
}

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

/* 后台管理入口链接 */
.footer-admin {
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--border);
    font-size: 0.78rem;
}

.footer-admin a {
    color: var(--text-muted);
    transition: color 0.2s;
}

.footer-admin a:hover {
    color: var(--primary);
    text-decoration: none;
}

/* Toast 提示 */
.toast {
    position: fixed;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    background: #1f2937;
    color: #fff;
    padding: 10px 24px;
    border-radius: 24px;
    font-size: 0.85rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
    z-index: 9999;
}
.toast.show { opacity: 1; }

/* 文本工具类 */
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-error { color: var(--error); }
.text-muted { color: var(--text-muted); }

/* 空状态 */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}
.empty-state .icon { font-size: 3rem; margin-bottom: 8px; }

/* 响应式 */
@media (max-width: 640px) {
    .container { padding: 12px; }
}