/* ═══════════════════════════════════════════════════════
   RebuildBT — 前后台统一样式
   设计语言：深色顶栏 + 白色内容区 + 蓝色主色调
   ═══════════════════════════════════════════════════════ */

/* ─── Reset & Variables ─────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #dbeafe;
    --success: #16a34a;
    --success-light: #dcfce7;
    --warning: #d97706;
    --warning-light: #fef3c7;
    --danger: #dc2626;
    --danger-light: #fee2e2;
    --info: #0891b2;
    --info-light: #cffafe;
    --dark: #0f172a;
    --dark-2: #1e293b;
    --bg: #f1f5f9;
    --card-bg: #fff;
    --text: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --radius: 8px;
    --radius-sm: 6px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --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);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
    --header-h: 60px;
}

html { font-size: 15px; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial,
                 "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg); color: var(--text); line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

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

/* ─── Site Header (前后台共用) ──────────────────────── */
.site-header {
    background: var(--dark); padding: 0 24px;
    position: sticky; top: 0; z-index: 100; height: var(--header-h);
}
.header-inner {
    max-width: 1280px; margin: 0 auto;
    display: flex; justify-content: space-between; align-items: center;
    height: 100%;
}
.header-logo {
    display: flex; align-items: center; gap: 10px;
}
.header-logo .logo-text {
    font-size: 20px; font-weight: 700; color: #fff; letter-spacing: -0.5px;
}
.header-logo .logo-sub {
    font-size: 11px; color: var(--text-muted);
    padding-left: 10px; border-left: 1px solid rgba(255,255,255,0.2);
}

/* 前台导航 */
.site-nav { display: flex; align-items: center; gap: 8px; }
.site-nav a {
    color: rgba(255,255,255,0.75); font-size: 14px; padding: 6px 14px;
    border-radius: var(--radius-sm); transition: all 0.15s;
}
.site-nav a:hover { color: #fff; background: rgba(255,255,255,0.1); }
.site-nav a.nav-active { color: #fff; background: rgba(255,255,255,0.15); }

.lang-switch { display: flex; gap: 2px; margin-left: 8px; }
.lang-switch a {
    padding: 4px 10px; border: 1px solid rgba(255,255,255,0.2); border-radius: 4px;
    font-size: 12px; color: rgba(255,255,255,0.6);
}
.lang-switch a:hover, .lang-switch a.active {
    background: var(--primary); color: #fff; border-color: var(--primary);
}

/* 管理后台导航 (header 内的 tab 条) */
.admin-nav { display: flex; align-items: center; gap: 2px; }
.admin-nav a {
    color: rgba(255,255,255,0.7); font-size: 13px; padding: 6px 14px;
    border-radius: var(--radius-sm); transition: all 0.15s; white-space: nowrap;
}
.admin-nav a:hover { color: #fff; background: rgba(255,255,255,0.12); }
.admin-nav a.active {
    color: #fff; background: rgba(37,99,235,0.4); font-weight: 500;
}
.admin-nav .nav-sep {
    width: 1px; height: 20px; background: rgba(255,255,255,0.15); margin: 0 4px;
}
/* 用户信息 + 退出 */
.header-actions { display: flex; align-items: center; gap: 12px; }
.header-actions .user-tag {
    color: rgba(255,255,255,0.8); font-size: 13px; padding: 4px 10px;
    background: rgba(255,255,255,0.08); border-radius: 20px;
}
.header-actions .btn-logout {
    color: rgba(255,255,255,0.5); font-size: 13px; padding: 4px 10px;
    border-radius: var(--radius-sm); transition: all 0.15s;
}
.header-actions .btn-logout:hover { color: #fca5a5; background: rgba(220,38,38,0.15); }
.header-actions .btn-site {
    color: rgba(255,255,255,0.6); font-size: 13px; padding: 4px 10px;
    border-radius: var(--radius-sm);
}
.header-actions .btn-site:hover { color: #fff; background: rgba(255,255,255,0.1); }

/* ─── Site Main (前台内容区) ────────────────────────── */
.site-main { max-width: 1280px; margin: 0 auto; padding: 32px 24px; min-height: calc(100vh - var(--header-h) - 56px); }

/* Hero Banner */
.hero {
    text-align: center; padding: 72px 24px; margin-bottom: 48px;
    background: linear-gradient(135deg, var(--dark) 0%, var(--primary-dark) 100%);
    color: #fff; border-radius: 16px; position: relative; overflow: hidden;
}
.hero::after {
    content: ''; position: absolute; top: -50%; right: -20%;
    width: 400px; height: 400px; background: rgba(255,255,255,0.03);
    border-radius: 50%;
}
.hero h1 { font-size: 38px; font-weight: 800; margin-bottom: 12px; position: relative; z-index: 1; }
.hero p { font-size: 17px; opacity: 0.85; position: relative; z-index: 1; }

/* Section */
.section-title {
    font-size: 22px; font-weight: 700; margin-bottom: 24px;
    display: flex; align-items: center; gap: 12px;
}
.section-title::before {
    content: ''; display: inline-block; width: 4px; height: 22px;
    background: var(--primary); border-radius: 2px;
}

/* 产品网格 */
.product-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(270px, 1fr)); gap: 20px; margin-bottom: 48px; }
.product-card {
    background: #fff; border-radius: var(--radius); overflow: hidden;
    box-shadow: var(--shadow); transition: transform 0.15s, box-shadow 0.15s;
    border: 1px solid var(--border);
}
.product-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.product-card a { color: inherit; }
.product-image { height: 220px; overflow: hidden; background: #f8fafc; display: flex; align-items: center; justify-content: center; }
.product-image img { width: 100%; height: 100%; object-fit: cover; }
.product-image .no-image { color: var(--text-muted); font-size: 14px; }
.product-info { padding: 16px; }
.product-info h3 { font-size: 16px; font-weight: 600; margin-bottom: 4px; line-height: 1.4; }
.product-title-en { font-size: 12px; color: var(--text-muted); margin-bottom: 8px; }
.product-price { font-size: 18px; font-weight: 700; color: var(--danger); }

/* 分类网格 */
.category-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 16px; }
.category-card {
    background: #fff; padding: 28px 20px; border-radius: var(--radius);
    text-align: center; box-shadow: var(--shadow); border: 1px solid var(--border);
    transition: transform 0.15s, border-color 0.15s;
}
.category-card:hover { transform: translateY(-2px); border-color: var(--primary); }
.category-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 4px; }
.category-card p { font-size: 13px; color: var(--text-muted); }

/* 产品详情 */
.product-detail { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.product-gallery { }
.gallery-main { border-radius: var(--radius); overflow: hidden; margin-bottom: 12px; background: #f8fafc; }
.gallery-main img { width: 100%; max-height: 420px; object-fit: contain; }
.gallery-thumbs { display: flex; gap: 8px; flex-wrap: wrap; }
.gallery-thumbs .thumb {
    width: 64px; height: 64px; object-fit: cover; border-radius: var(--radius-sm);
    cursor: pointer; border: 2px solid var(--border); transition: border-color 0.15s;
}
.gallery-thumbs .thumb:hover, .gallery-thumbs .thumb.active { border-color: var(--primary); }

.product-info-detail h1 { font-size: 28px; font-weight: 700; margin-bottom: 8px; }
.product-info-detail .subtitle { color: var(--text-secondary); font-size: 15px; margin-bottom: 20px; }
.price-block { margin-bottom: 20px; display: flex; align-items: baseline; gap: 12px; }
.current-price { font-size: 30px; font-weight: 700; color: var(--danger); }
.original-price { font-size: 16px; color: var(--text-muted); text-decoration: line-through; }
.product-meta { display: flex; gap: 20px; font-size: 14px; color: var(--text-secondary); margin-bottom: 24px; flex-wrap: wrap; }
.product-desc { margin-bottom: 24px; line-height: 1.8; }
.product-desc h3 { font-size: 16px; font-weight: 600; margin-bottom: 8px; }
.specs-table { width: 100%; border-collapse: collapse; margin-bottom: 16px; }
.specs-table td { padding: 10px 14px; border-bottom: 1px solid var(--border); font-size: 14px; }
.specs-table td:first-child { width: 140px; font-weight: 500; color: var(--text-secondary); background: #f8fafc; }

/* 联系页 */
.contact-page { max-width: 640px; margin: 40px auto; }
.contact-page h1 { margin-bottom: 24px; }
.contact-form { background: #fff; padding: 32px; border-radius: var(--radius); box-shadow: var(--shadow); border: 1px solid var(--border); }

/* Footer */
.site-footer { background: var(--dark); color: rgba(255,255,255,0.4); text-align: center; padding: 16px 24px; font-size: 13px; }

/* ═══════════════════════════════════════════════════════
   管理后台
   ═══════════════════════════════════════════════════════ */

/* Admin Content Wrapper */
.admin-main { max-width: 1280px; margin: 0 auto; padding: 28px 24px; min-height: calc(100vh - var(--header-h)); }

/* KPI 卡片 */
.kpi-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 16px; margin-bottom: 24px; }
.kpi-card {
    background: #fff; border-radius: var(--radius); padding: 20px;
    text-align: center; box-shadow: var(--shadow); border: 1px solid var(--border);
    border-left: 3px solid var(--primary); transition: box-shadow 0.15s;
}
.kpi-card:hover { box-shadow: var(--shadow-md); }
.kpi-card.kpi-success { border-left-color: var(--success); }
.kpi-card.kpi-warning { border-left-color: var(--warning); }
.kpi-card.kpi-danger { border-left-color: var(--danger); }
.kpi-card.kpi-info { border-left-color: var(--info); }
.kpi-value { font-size: 28px; font-weight: 700; margin-bottom: 4px; line-height: 1; }
.kpi-label { font-size: 12px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; }

/* 面板 */
.panel {
    background: #fff; border-radius: var(--radius);
    margin-bottom: 20px; box-shadow: var(--shadow); border: 1px solid var(--border);
}
.panel-header {
    padding: 14px 20px; border-bottom: 1px solid var(--border);
    display: flex; justify-content: space-between; align-items: center;
    background: #fafbfc;
}
.panel-header h3 { font-size: 15px; font-weight: 600; }
.panel-body { padding: 20px; }

/* 仪表盘网格 */
.dashboard-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 20px; }

.stats-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 20px; }

/* 快捷操作 */
.quick-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.quick-btn {
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    padding: 20px 12px; background: var(--bg); border-radius: var(--radius);
    text-align: center; color: var(--text); transition: all 0.15s;
    border: 1px solid var(--border-light);
}
.quick-btn:hover { background: var(--primary); color: #fff; border-color: var(--primary); transform: translateY(-2px); }
.quick-icon { font-size: 24px; margin-bottom: 6px; }

/* 表格 */
.table { width: 100%; border-collapse: collapse; }
.table th, .table td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--border); font-size: 14px; }
.table th { background: #f8fafc; font-weight: 600; color: var(--text-secondary); font-size: 12px; text-transform: uppercase; letter-spacing: 0.5px; }
.table tbody tr { transition: background 0.1s; }
.table tbody tr:hover { background: #f8fafc; }
.table tr.unread-row { background: #fffbeb; }
.table tr.unread-row:hover { background: #fef3c7; }

/* 表单 */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 5px; font-weight: 500; font-size: 13px; color: var(--text-secondary); }
.form-input {
    width: 100%; padding: 9px 13px; border: 1px solid var(--border);
    border-radius: var(--radius-sm); font-size: 14px; font-family: inherit;
    transition: all 0.15s; background: #fff; color: var(--text);
}
.form-input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,0.1); }
.form-input::placeholder { color: var(--text-muted); }
.form-row { display: flex; gap: 14px; }
.form-row .form-group { flex: 1; }
textarea.form-input { resize: vertical; min-height: 80px; }

fieldset { border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-bottom: 20px; }
fieldset legend { font-weight: 600; font-size: 14px; padding: 0 10px; color: var(--primary); }

.form-actions { padding: 16px 0; display: flex; align-items: center; gap: 12px; }

/* 按钮 */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 8px 16px; border: 1px solid var(--border);
    border-radius: var(--radius-sm); font-size: 14px; cursor: pointer;
    background: #fff; color: var(--text); transition: all 0.15s; font-family: inherit;
    white-space: nowrap; gap: 6px;
}
.btn:hover { border-color: var(--primary); color: var(--primary); }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-dark); color: #fff; }
.btn-danger { color: var(--danger); border-color: var(--danger-light); }
.btn-danger:hover { background: var(--danger); color: #fff; border-color: var(--danger); }
.btn-success { background: var(--success); color: #fff; border-color: var(--success); }
.btn-full { width: 100%; }
.btn-sm { padding: 5px 10px; font-size: 13px; }
.btn-outline { background: transparent; }

/* 徽章 */
.badge {
    display: inline-block; padding: 2px 8px; border-radius: 12px;
    font-size: 11px; font-weight: 500;
}
.badge-success { background: var(--success-light); color: var(--success); }
.badge-danger { background: var(--danger-light); color: var(--danger); }
.badge-warning { background: var(--warning-light); color: var(--warning); }
.badge-info { background: var(--info-light); color: var(--info); }
.badge-default { background: var(--bg); color: var(--text-muted); }

/* 工具栏 */
.toolbar {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 20px; gap: 12px; flex-wrap: wrap;
}
.toolbar-left, .toolbar-right { display: flex; align-items: center; gap: 10px; }

.status-tabs, .period-tabs { display: flex; gap: 4px; }
.tab {
    padding: 6px 14px; border-radius: var(--radius-sm); font-size: 13px;
    background: #fff; border: 1px solid var(--border);
    color: var(--text-secondary); cursor: pointer; transition: all 0.15s;
}
.tab:hover { border-color: var(--primary); color: var(--primary); }
.tab.active { background: var(--primary); color: #fff; border-color: var(--primary); }

.search-form { display: flex; gap: 8px; align-items: center; }
.search-form .form-input { width: auto; }

/* 分页 */
.pagination { display: flex; align-items: center; gap: 6px; padding: 16px 0; flex-wrap: wrap; }
.page-btn {
    padding: 6px 12px; border: 1px solid var(--border); border-radius: var(--radius-sm);
    font-size: 13px; color: var(--text-secondary); background: #fff;
}
.page-btn:hover { border-color: var(--primary); color: var(--primary); }
.page-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.page-dots { padding: 6px 2px; color: var(--text-muted); }
.page-info { margin-left: 10px; font-size: 13px; color: var(--text-muted); }

/* 统计卡片 */
.stats-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(100px, 1fr)); gap: 12px; }
.stat-item {
    text-align: center; padding: 16px; background: var(--bg);
    border-radius: var(--radius); border: 1px solid var(--border-light);
}
.stat-num { display: block; font-size: 22px; font-weight: 700; margin-bottom: 4px; }
.stat-label { font-size: 12px; color: var(--text-muted); }
.stat-success .stat-num { color: var(--success); }
.stat-warning .stat-num { color: var(--warning); }
.stat-danger .stat-num { color: var(--danger); }

/* 登录页 */
.login-page {
    min-height: 100vh; display: flex; align-items: center; justify-content: center;
    background: linear-gradient(135deg, var(--dark) 0%, var(--dark-2) 100%);
}
.login-card {
    background: #fff; border-radius: 12px; padding: 40px;
    width: 380px; max-width: 90%; box-shadow: var(--shadow-lg);
}
.login-header { text-align: center; margin-bottom: 28px; }
.login-header h1 { font-size: 26px; color: var(--primary); font-weight: 700; }
.login-header p { color: var(--text-muted); font-size: 14px; margin-top: 4px; }
.login-form .form-group { margin-bottom: 20px; }
.login-form .form-input { padding: 11px 14px; font-size: 15px; }

/* Flash Messages */
.flash-messages { margin-bottom: 16px; }
.flash-msg {
    padding: 10px 16px; border-radius: var(--radius-sm); font-size: 14px;
    margin-bottom: 8px; border: 1px solid transparent;
}
.flash-success { background: var(--success-light); color: var(--success); border-color: #bbf7d0; }
.flash-error { background: var(--danger-light); color: var(--danger); border-color: #fecaca; }
.flash-warning { background: var(--warning-light); color: var(--warning); border-color: #fde68a; }
.flash-info { background: var(--info-light); color: var(--info); border-color: #a5f3fc; }

/* 模态 */
.modal { position: fixed; top: 0; left: 0; right: 0; bottom: 0; z-index: 1000; }
.modal-overlay { position: absolute; top: 0; left: 0; right: 0; bottom: 0; background: rgba(15,23,42,0.6); }
.modal-content {
    position: relative; background: #fff; border-radius: 12px;
    margin: 60px auto; max-width: 600px; width: 90%; box-shadow: var(--shadow-lg);
}
.modal-header {
    padding: 16px 20px; border-bottom: 1px solid var(--border);
    display: flex; justify-content: space-between; align-items: center;
}
.modal-close { background: none; border: none; font-size: 22px; cursor: pointer; color: var(--text-muted); }
.modal-body { padding: 20px; max-height: 60vh; overflow-y: auto; }

/* 产品图片列表 */
.image-list { display: flex; flex-wrap: wrap; gap: 8px; }
.image-item { position: relative; display: inline-block; }
.image-item img { border-radius: var(--radius-sm); }
.image-delete {
    position: absolute; top: -8px; right: -8px; cursor: pointer;
    background: var(--danger); color: #fff; border-radius: 50%;
    width: 22px; height: 22px; display: flex; align-items: center; justify-content: center;
    font-size: 12px; line-height: 1; border: 2px solid #fff;
}

/* 规格行 */
.spec-row { display: flex; gap: 8px; align-items: flex-end; margin-bottom: 8px; }
.spec-row .form-input { flex: 1; }
.spec-row .btn { flex-shrink: 0; }

/* 设置布局 */
.settings-layout { display: flex; flex-direction: column; gap: 20px; max-width: 720px; }

/* ─── 通用工具 ──────────────────────────────────────── */
.text-muted { color: var(--text-muted); }
.text-center { text-align: center; }
.text-right { text-align: right; }
.empty-state { text-align: center; padding: 48px 20px; color: var(--text-muted); }
.empty-state .empty-icon { font-size: 40px; margin-bottom: 12px; }

/* ─── 响应式 ────────────────────────────────────────── */
@media (max-width: 768px) {
    html { font-size: 14px; }

    .header-inner { flex-wrap: wrap; height: auto; padding: 10px 0; }
    .site-header { height: auto; }
    .admin-nav { order: 3; width: 100%; overflow-x: auto; padding-bottom: 8px; }
    .admin-nav a { font-size: 12px; padding: 5px 10px; }
    .admin-nav .nav-sep { display: none; }

    .dashboard-grid, .stats-grid { grid-template-columns: 1fr; }
    .kpi-grid { grid-template-columns: repeat(3, 1fr); }
    .form-row { flex-direction: column; }
    .product-detail { grid-template-columns: 1fr; }
    .toolbar { flex-direction: column; align-items: flex-start; }
    .quick-actions { grid-template-columns: 1fr 1fr; }

    .hero { padding: 48px 20px; }
    .hero h1 { font-size: 28px; }
}