/* ============================================
   管理后台样式
   ============================================ */

:root {
    --admin-bg: #111111;
    --admin-bg-card: rgba(24,24,24,0.65);
    --admin-bg-card-hover: rgba(24,24,24,0.85);
    --admin-bg-input: rgba(255,255,255,0.06);
    --admin-bg-sidebar: linear-gradient(180deg, rgba(14,14,14,0.98) 0%, rgba(10,10,10,0.98) 100%);
    --admin-bg-login: rgba(18,18,18,0.92);
    --admin-text-1: #e5e5e5;
    --admin-text-2: #b3b3b3;
    --admin-text-3: #888;
    --admin-text-4: #666;
    --admin-text-muted: #707070;
    --admin-text-nav: #858585;
    --admin-border: rgba(255,255,255,0.06);
    --admin-border-accent: rgba(148,163,184,0.12);
    --admin-border-accent-hover: rgba(148,163,184,0.28);
    --admin-border-input: rgba(255,255,255,0.1);
    --admin-border-sidebar: rgba(148,163,184,0.1);
    --admin-accent: #94a3b8;
    --admin-accent-soft: #cbd5e1;
    --admin-accent-text: #e2e8f0;
    --admin-accent-bg: rgba(148,163,184,0.08);
    --admin-accent-bg-hover: rgba(148,163,184,0.15);
    --admin-shadow: rgba(0,0,0,0.5);
    --admin-chart-border: #1a1a1a;
    --admin-chart-grid: rgba(255,255,255,0.06);
}

[data-theme="light"] {
    --admin-bg: #f3f4f8;
    --admin-bg-card: rgba(255,255,255,0.85);
    --admin-bg-card-hover: rgba(255,255,255,0.95);
    --admin-bg-input: rgba(0,0,0,0.04);
    --admin-bg-sidebar: linear-gradient(180deg, rgba(255,255,255,0.98) 0%, rgba(248,249,252,0.98) 100%);
    --admin-bg-login: rgba(255,255,255,0.92);
    --admin-text-1: #1a1a1a;
    --admin-text-2: #374151;
    --admin-text-3: #6b7280;
    --admin-text-4: #9ca3af;
    --admin-text-muted: #6b7280;
    --admin-text-nav: #6b7280;
    --admin-border: rgba(0,0,0,0.08);
    --admin-border-accent: rgba(100,116,139,0.18);
    --admin-border-accent-hover: rgba(100,116,139,0.35);
    --admin-border-input: rgba(0,0,0,0.12);
    --admin-border-sidebar: rgba(100,116,139,0.12);
    --admin-accent: #64748b;
    --admin-accent-soft: #64748b;
    --admin-accent-text: #475569;
    --admin-accent-bg: rgba(100,116,139,0.06);
    --admin-accent-bg-hover: rgba(100,116,139,0.12);
    --admin-shadow: rgba(0,0,0,0.1);
    --admin-chart-border: #fff;
    --admin-chart-grid: rgba(0,0,0,0.06);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--admin-bg);
    color: var(--admin-text-2);
    min-height: 100vh;
}

a { color: inherit; text-decoration: none; }

/* ---------- 登录页 ---------- */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: 
        radial-gradient(ellipse at 30% 50%, rgba(148,163,184,0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 30%, rgba(100,116,139,0.06) 0%, transparent 50%),
        var(--admin-bg);
}

.login-container { width: 400px; max-width: 95vw; }

.login-card {
    background: var(--admin-bg-login);
    backdrop-filter: blur(20px);
    border: 1px solid var(--admin-border-accent);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 60px var(--admin-shadow);
}

.login-header { text-align: center; margin-bottom: 28px; }
.login-header h1 { font-size: 48px; margin-bottom: 8px; }
.login-header h2 {
    font-size: 22px;
    background: linear-gradient(135deg, #94a3b8, #cbd5e1);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.login-header p { color: var(--admin-text-3); font-size: 14px; margin-top: 6px; }

.login-form .form-group { margin-bottom: 18px; }
.login-form label { display: block; font-size: 13px; color: var(--admin-text-3); margin-bottom: 6px; }
.login-form input {
    width: 100%;
    padding: 11px 14px;
    background: var(--admin-bg-input);
    border: 1px solid var(--admin-border-input);
    border-radius: 10px;
    color: var(--admin-text-1);
    font-size: 14px;
    outline: none;
    transition: border-color 0.3s;
}
.login-form input:focus { border-color: var(--admin-accent); }

.login-footer {
    text-align: center;
    margin-top: 20px;
}
.login-footer a {
    color: var(--admin-text-3);
    font-size: 13px;
    transition: color 0.2s;
}
.login-footer a:hover { color: var(--admin-accent); }

/* ---------- 后台布局 ---------- */
.admin-layout {
    display: flex;
    min-height: 100vh;
}

/* 侧边栏 */
.sidebar {
    width: 240px;
    background: var(--admin-bg-sidebar);
    border-right: 1px solid var(--admin-border-sidebar);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
    backdrop-filter: blur(20px);
}

.sidebar-header {
    padding: 16px;
    border-bottom: 1px solid var(--admin-border);
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}
.sidebar-logo {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    object-fit: cover;
    flex-shrink: 0;
}
.sidebar-header-text {
    min-width: 0;
}
.sidebar-header h2 {
    font-size: 14px;
    font-weight: 700;
    color: var(--admin-text-1);
    line-height: 1.3;
}
.sidebar-copyright {
    font-size: 11px;
    color: var(--admin-text-4);
    line-height: 1.3;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-nav {
    flex: 1;
    padding: 16px 10px;
    display: flex;
    flex-direction: column;
    gap: 2px;
    overflow-y: auto;
    min-height: 0;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 11px 16px;
    font-size: 13.5px;
    font-weight: 500;
    color: var(--admin-text-nav);
    border-radius: 10px;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.nav-item:hover {
    color: var(--admin-text-2);
    background: var(--admin-accent-bg);
}
.nav-item:hover .nav-icon svg {
    filter: drop-shadow(0 0 3px rgba(148,163,184,0.4));
}

.nav-item.active {
    color: var(--admin-accent-text);
    background: var(--admin-accent-bg-hover);
}
.nav-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 20px;
    border-radius: 0 3px 3px 0;
    background: linear-gradient(180deg, #94a3b8, #cbd5e1);
}
.nav-item.active .nav-icon svg {
    filter: drop-shadow(0 0 4px rgba(148,163,184,0.5));
}

.nav-item.logout:hover {
    color: #fca5a5;
    background: rgba(239,68,68,0.1);
}

.nav-icon { display: inline-flex; align-items: center; justify-content: center; width: 20px; flex-shrink: 0; }
.nav-icon svg { vertical-align: middle; transition: filter 0.25s; }

.sidebar-footer {
    border-top: 1px solid var(--admin-border);
    padding: 10px;
    display: flex;
    flex-direction: column;
    gap: 2px;
    flex-shrink: 0;
}

/* 主内容区 */
.admin-main {
    flex: 1;
    margin-left: 240px;
    padding: 24px 32px;
    min-height: 100vh;
}

.admin-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--admin-border);
}

.admin-header h1 { font-size: 22px; font-weight: 700; display: flex; align-items: center; gap: 8px; color: var(--admin-text-1); }
.admin-header h1 svg { flex-shrink: 0; color: var(--admin-accent-soft); }

.admin-user {
    font-size: 13px;
    color: var(--admin-text-3);
    background: var(--admin-bg-input);
    padding: 6px 12px;
    border-radius: 8px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

/* ---------- 统计卡片 ---------- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--admin-bg-card);
    border: 1px solid var(--admin-border-accent);
    border-radius: 14px;
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}
.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, rgba(148,163,184,0.4), transparent);
    opacity: 0;
    transition: opacity 0.3s;
}
.stat-card:hover::before { opacity: 1; }

.stat-card:hover {
    border-color: var(--admin-border-accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(148,163,184,0.08);
}

.stat-icon {
    font-size: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 12px;
    background: rgba(148,163,184,0.08);
    flex-shrink: 0;
}
.stat-icon svg { color: var(--admin-accent-soft); }
.stat-number { font-size: 26px; font-weight: 700; color: var(--admin-text-1); }
.stat-label { font-size: 12.5px; color: var(--admin-text-muted); margin-top: 2px; letter-spacing: 0.2px; }

/* ---------- 区块卡片 ---------- */
.section-card {
    background: var(--admin-bg-card);
    border: 1px solid var(--admin-border-accent);
    border-radius: 14px;
    padding: 24px;
    margin-bottom: 20px;
    transition: border-color 0.3s;
}
.section-card:hover {
    border-color: var(--admin-border-accent-hover);
}

.section-card h3 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 16px;
    padding-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
    border-bottom: 1px solid var(--admin-border);
    color: var(--admin-text-2);
}
.section-card h3 svg { color: var(--admin-accent-soft); flex-shrink: 0; }

/* ---------- 图表区域 ---------- */
.charts-grid {
    display: grid;
    grid-template-columns: 1.6fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}
.chart-card {
    margin-bottom: 0;
}
.chart-wrap {
    position: relative;
    height: 260px;
}
.chart-wrap-sm {
    height: 240px;
}
@media (max-width: 768px) {
    .charts-grid { grid-template-columns: 1fr; }
}

/* ---------- 快速操作 ---------- */
.quick-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.action-btn {
    padding: 10px 20px;
    background: var(--admin-accent-bg);
    border: 1px solid var(--admin-border-accent);
    border-radius: 10px;
    font-size: 13.5px;
    font-weight: 500;
    color: var(--admin-text-nav);
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.action-btn:hover {
    background: var(--admin-accent-bg-hover);
    border-color: var(--admin-border-accent-hover);
    color: var(--admin-text-2);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(148,163,184,0.1);
}

/* ---------- 数据表格 ---------- */
.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th {
    text-align: left;
    padding: 12px 14px;
    font-size: 12px;
    text-transform: uppercase;
    color: var(--admin-text-4);
    border-bottom: 1px solid var(--admin-border);
    font-weight: 600;
    letter-spacing: 0.5px;
}

.data-table td {
    padding: 14px;
    border-bottom: 1px solid var(--admin-border);
    font-size: 14px;
    vertical-align: middle;
}

.data-table tbody tr {
    transition: background 0.2s;
}

.data-table tbody tr:hover {
    background: var(--admin-accent-bg);
}

.cell-sub {
    font-size: 12px;
    color: var(--admin-text-4);
    margin-top: 2px;
}

.link-url {
    color: var(--admin-accent-soft);
    font-size: 13px;
}
.link-url:hover { text-decoration: underline; }

.actions {
    display: flex;
    gap: 6px;
    align-items: center;
}

/* 状态点 */
.status-dot {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 12px;
}

.status-dot::before {
    content: '';
    width: 7px;
    height: 7px;
    border-radius: 50%;
}

.status-dot.active::before { background: #22c55e; box-shadow: 0 0 6px rgba(34,197,94,0.5); }
.status-dot.inactive::before { background: #666; }

/* 徽章 */
.badge {
    display: inline-block;
    font-size: 11px;
    padding: 2px 8px;
    border-radius: 20px;
}

.badge-blue { background: rgba(59,130,246,0.15); color: #60a5fa; }
.badge-purple { background: rgba(148,163,184,0.15); color: #cbd5e1; }
.badge-green { background: rgba(34,197,94,0.15); color: #4ade80; }
.badge-red { background: rgba(239,68,68,0.15); color: #f87171; }
.badge-orange { background: rgba(249,115,22,0.15); color: #fb923c; }
.badge-pink { background: rgba(236,72,153,0.15); color: #f472b6; }
.badge-cyan { background: rgba(6,182,212,0.15); color: #22d3ee; }
.badge-yellow { background: rgba(234,179,8,0.15); color: #facc15; }

/* ---------- 表单 ---------- */
.form-group {
    margin-bottom: 18px;
}

.form-group small {
    display: block;
    margin-top: 4px;
    font-size: 12px;
    color: var(--admin-text-4);
}

.form-group .input-preview {
    display: flex;
    align-items: center;
    gap: 12px;
}
.form-group .input-preview input { flex: 1; min-width: 0; width: auto; }

.form-group label {
    display: block;
    font-size: 13px;
    color: var(--admin-text-3);
    margin-bottom: 6px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 14px;
    background: var(--admin-bg-input);
    border: 1px solid var(--admin-border-input);
    border-radius: 10px;
    color: var(--admin-text-1);
    font-size: 14px;
    outline: none;
    transition: border-color 0.3s;
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--admin-accent);
}

.form-group select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23888' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 32px;
}

.form-group input[type="checkbox"] {
    width: auto;
    margin-right: 6px;
    accent-color: var(--admin-accent);
}

.form-row {
    display: flex;
    gap: 16px;
}

.form-row .form-group { flex: 1; }

.form-actions {
    display: flex;
    gap: 12px;
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--admin-border);
}

/* ---------- 按钮 ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
    white-space: nowrap;
}

.btn:hover { transform: translateY(-1px); }

.btn-primary {
    background: linear-gradient(135deg, #64748b, #94a3b8);
    color: #fff;
}
.btn-primary:hover { box-shadow: 0 6px 20px rgba(148,163,184,0.35); }

.btn-secondary {
    background: var(--admin-bg-input);
    color: var(--admin-text-2);
    border: 1px solid var(--admin-border-input);
}
.btn-secondary:hover { background: var(--admin-accent-bg); }

.btn-danger {
    background: rgba(239,68,68,0.15);
    color: #f87171;
    border: 1px solid rgba(239,68,68,0.2);
}
.btn-danger:hover { background: rgba(239,68,68,0.25); }

.btn-block { width: 100%; justify-content: center; }

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
    border-radius: 8px;
}

/* ---------- 提示框 ---------- */
.alert {
    padding: 12px 16px;
    border-radius: 10px;
    font-size: 14px;
    margin-bottom: 16px;
}

.alert-success {
    background: rgba(34,197,94,0.12);
    border: 1px solid rgba(34,197,94,0.25);
    color: #4ade80;
}

.alert-error {
    background: rgba(239,68,68,0.12);
    border: 1px solid rgba(239,68,68,0.25);
    color: #f87171;
}

/* ---------- 标签页 ---------- */
.tabs {
    display: flex;
    gap: 4px;
    margin-bottom: 20px;
    background: var(--admin-bg-card);
    border-radius: 12px;
    padding: 4px;
    border: 1px solid var(--admin-border-accent);
}

.tab {
    flex: 1;
    text-align: center;
    padding: 10px 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-size: 13.5px;
    font-weight: 500;
    border-radius: 10px;
    color: var(--admin-text-muted);
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}

.tab:hover { color: var(--admin-text-2); background: var(--admin-accent-bg); }

.tab.active {
    background: var(--admin-accent-bg-hover);
    color: var(--admin-accent-text);
    box-shadow: 0 2px 8px rgba(148,163,184,0.15);
}

/* ---------- 背景图管理 ---------- */
.bg-item {
    display: flex;
    gap: 8px;
    margin-bottom: 8px;
    align-items: center;
}

.bg-item input {
    flex: 1;
    padding: 10px 14px;
    background: var(--admin-bg-input);
    border: 1px solid var(--admin-border-input);
    border-radius: 10px;
    color: var(--admin-text-1);
    font-size: 14px;
    outline: none;
}

.bg-item input:focus { border-color: var(--admin-accent); }

/* ---------- 筛选栏 ---------- */
.filter-bar {
    margin-bottom: 16px;
}

.filter-bar select {
    padding: 8px 14px;
    background: var(--admin-bg-card-hover);
    border: 1px solid var(--admin-border-accent);
    border-radius: 10px;
    color: var(--admin-text-2);
    font-size: 13px;
    outline: none;
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23888' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 32px;
}

/* ---------- 汉堡按钮 ---------- */
.sidebar-toggle {
    display: none;
    position: fixed;
    top: 14px;
    left: 14px;
    z-index: 201;
    background: var(--admin-bg-card);
    border: 1px solid var(--admin-border-accent);
    border-radius: 10px;
    padding: 8px;
    color: var(--admin-text-2);
    cursor: pointer;
    backdrop-filter: blur(12px);
    transition: background 0.2s;
    line-height: 0;
}
.sidebar-toggle:hover { background: var(--admin-accent-bg-hover); }
.sidebar-toggle svg { width: 20px; height: 20px; }

/* 主题切换（复用 .nav-item 样式，仅重置 button 默认值） */
.admin-theme-btn {
    background: none;
    border: none;
    cursor: pointer;
    font: inherit;
    width: 100%;
    text-align: left;
}

/* 侧边栏遮罩 */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 99;
}

/* 表格滚动容器 */
.table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

/* ---------- 响应式 ---------- */
@media (max-width: 768px) {
    .sidebar-toggle { display: block; }
    .sidebar-overlay.active { display: block; }

    .sidebar {
        width: 260px;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }
    .sidebar.open {
        transform: translateX(0);
    }

    .admin-main {
        margin-left: 0;
        padding: 64px 16px 24px;
        min-width: 0;
        overflow-x: hidden;
        width: 100%;
    }

    .admin-layout {
        overflow-x: hidden;
    }

    .admin-header { flex-wrap: wrap; gap: 8px; }
    .admin-header h1 { font-size: 18px; }

    .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .stat-card { padding: 14px; gap: 10px; }
    .stat-icon { width: 40px; height: 40px; }
    .stat-icon svg { width: 22px; height: 22px; }
    .stat-number { font-size: 20px; }

    .charts-grid { grid-template-columns: 1fr; }
    .chart-wrap { height: 200px; }

    .section-card { padding: 16px; }
    .section-card h3 { font-size: 14px; }

    .data-table { min-width: 560px; }
    .data-table th { padding: 10px 12px; font-size: 11px; }
    .data-table td { padding: 10px 12px; font-size: 13px; }

    .quick-actions { gap: 8px; }
    .action-btn { padding: 8px 14px; font-size: 12.5px; }

    .form-row { flex-direction: column; gap: 0; }

    .form-actions { flex-direction: column; gap: 10px; }
    .form-actions .btn { width: 100%; justify-content: center; }

    .form-group .input-preview { flex-wrap: wrap; }
    .form-group .input-preview img { order: -1; }

    .form-group [style*="display:flex"] { flex-wrap: wrap !important; }

    .bg-item { flex-wrap: wrap; }
    .bg-item input { min-width: 0; }

    .admin-header .btn { width: 100%; justify-content: center; font-size: 13px; padding: 8px 14px; }

    .tabs { overflow-x: auto; flex-wrap: nowrap; }
    .tab { white-space: nowrap; flex: 0 0 auto; padding: 8px 14px; font-size: 12.5px; }
}

@media (max-width: 480px) {
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .admin-header { flex-direction: column; gap: 8px; align-items: flex-start; }
    .admin-header h1 { font-size: 16px; }
    .login-card { padding: 28px 20px; }
}