/* ============================================
   后台管理系统样式
   ============================================ */

:root {
    --admin-primary: #1a264a;
    --admin-sidebar: #111827;
    --admin-bg: #f3f4f6;
    --admin-card: #fff;
    --admin-text: #1f2937;
    --admin-text-light: #6b7280;
    --admin-border: #e5e7eb;
    --admin-accent: #e8590c;
    --admin-success: #10b981;
    --admin-danger: #ef4444;
    --admin-warning: #f59e0b;
    --admin-radius: 10px;
    --sidebar-width: 240px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif; background: var(--admin-bg); color: var(--admin-text); line-height: 1.6; }

a { color: var(--admin-accent); text-decoration: none; }
a:hover { color: #ff7b3d; }

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

/* ---- 侧边栏 ---- */
.admin-sidebar {
    width: var(--sidebar-width); background: var(--admin-sidebar); color: #fff;
    display: flex; flex-direction: column; position: fixed; top: 0; left: 0;
    height: 100vh; z-index: 100; transition: transform .3s; overflow-y: auto;
}
.sidebar-brand { padding: 20px; font-size: 1.1rem; font-weight: 700; border-bottom: 1px solid rgba(255,255,255,.08); }
.sidebar-brand a { color: #fff; }
.sidebar-brand a:hover { color: var(--admin-accent); }
.sidebar-nav { flex: 1; padding: 12px 0; }
.sidebar-nav ul { list-style: none; }
.sidebar-nav li { margin-bottom: 2px; }
.sidebar-nav a {
    display: block; padding: 10px 20px; color: rgba(255,255,255,.7);
    font-size: .93rem; transition: all .2s;
}
.sidebar-nav a:hover, .sidebar-nav a.active { color: #fff; background: rgba(255,255,255,.08); border-left: 3px solid var(--admin-accent); }
.sidebar-footer { padding: 16px 20px; border-top: 1px solid rgba(255,255,255,.08); }
.sidebar-footer a { color: rgba(255,255,255,.5); font-size: .88rem; }
.sidebar-footer a:hover { color: var(--admin-danger); }

/* ---- 主区域 ---- */
.admin-main { flex: 1; margin-left: var(--sidebar-width); min-width: 0; }
.admin-topbar {
    background: #fff; height: 56px; display: flex; align-items: center; justify-content: space-between;
    padding: 0 24px; border-bottom: 1px solid var(--admin-border); position: sticky; top: 0; z-index: 50;
}
.topbar-right { display: flex; align-items: center; gap: 16px; }
.sidebar-toggle { display: none; background: none; border: none; font-size: 1.3rem; cursor: pointer; padding: 4px; }
.admin-content { padding: 24px; }

/* ---- 登录页 ---- */
.login-page { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: linear-gradient(135deg,var(--admin-primary),#0f1724); }
.login-box { background: #fff; padding: 40px; border-radius: var(--admin-radius); box-shadow: 0 20px 60px rgba(0,0,0,.3); width: 100%; max-width: 400px; }
.login-box h1 { text-align: center; margin-bottom: 8px; font-size: 1.5rem; }
.login-box .login-sub { text-align: center; color: var(--admin-text-light); margin-bottom: 28px; font-size: .9rem; }

/* ---- 卡片/面板 ---- */
.panel { background: var(--admin-card); border-radius: var(--admin-radius); box-shadow: 0 1px 3px rgba(0,0,0,.06); }
.panel-header { padding: 18px 24px; border-bottom: 1px solid var(--admin-border); display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.panel-header h2 { font-size: 1.1rem; font-weight: 600; }
.panel-body { padding: 24px; }

/* ---- 统计卡片 ---- */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 16px; margin-bottom: 28px; }
.stat-card { background: var(--admin-card); border-radius: var(--admin-radius); padding: 20px; box-shadow: 0 1px 3px rgba(0,0,0,.06); }
.stat-card .stat-icon { font-size: 2rem; margin-bottom: 8px; }
.stat-card .stat-num { font-size: 1.8rem; font-weight: 700; }
.stat-card .stat-label { color: var(--admin-text-light); font-size: .88rem; }

/* ---- 表单 ---- */
.form-group { margin-bottom: 18px; }
.form-group label { display: block; margin-bottom: 6px; font-weight: 600; font-size: .9rem; color: var(--admin-text); }
.form-control {
    width: 100%; padding: 10px 14px; border: 1px solid var(--admin-border); border-radius: 8px;
    font-size: .95rem; font-family: inherit; transition: border-color .2s; background: #fff;
}
.form-control:focus { outline: none; border-color: var(--admin-accent); box-shadow: 0 0 0 3px rgba(232,89,12,.1); }
textarea.form-control { resize: vertical; min-height: 120px; }
select.form-control { appearance: auto; }

.form-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; }

.btn {
    display: inline-flex; align-items: center; gap: 6px; padding: 10px 22px;
    font-size: .93rem; font-weight: 600; border: none; border-radius: 8px;
    cursor: pointer; transition: all .2s;
}
.btn-primary { background: var(--admin-accent); color: #fff; }
.btn-primary:hover { background: #ff7b3d; color: #fff; }
.btn-secondary { background: #e5e7eb; color: var(--admin-text); }
.btn-secondary:hover { background: #d1d5db; }
.btn-danger { background: var(--admin-danger); color: #fff; }
.btn-danger:hover { background: #dc2626; color: #fff; }
.btn-success { background: var(--admin-success); color: #fff; }
.btn-success:hover { background: #059669; color: #fff; }
.btn-sm { padding: 6px 14px; font-size: .85rem; }
.btn-block { display: block; width: 100%; }

/* ---- 表格 ---- */
.table-wrap { overflow-x: auto; }
.data-table { width: 100%; border-collapse: collapse; font-size: .92rem; }
.data-table th { background: #f9fafb; padding: 12px 16px; text-align: left; font-weight: 600; color: var(--admin-text-light); white-space: nowrap; border-bottom: 2px solid var(--admin-border); }
.data-table td { padding: 12px 16px; border-bottom: 1px solid var(--admin-border); vertical-align: middle; }
.data-table tbody tr:hover { background: #f9fafb; }
.data-table .thumb-sm { width: 60px; height: 40px; object-fit: cover; border-radius: 4px; }
.table-actions { display: flex; gap: 6px; flex-wrap: wrap; }

/* ---- 消息提示 ---- */
.flash { padding: 12px 18px; border-radius: 8px; margin-bottom: 18px; font-size: .9rem; font-weight: 500; }
.flash-success { background: #d1fae5; color: #065f46; border: 1px solid #a7f3d0; }
.flash-error { background: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }
.flash-info { background: #dbeafe; color: #1e40af; border: 1px solid #bfdbfe; }

/* ---- 分页 ---- */
.pagination { display: flex; justify-content: center; margin-top: 20px; gap: 4px; }
.pagination a, .pagination span { padding: 6px 12px; border-radius: 6px; font-size: .88rem; border: 1px solid var(--admin-border); }
.pagination span.active { background: var(--admin-accent); color: #fff; border-color: var(--admin-accent); }

/* ---- 视频嵌入预览 ---- */
.embed-preview { max-width: 480px; border-radius: 8px; overflow: hidden; background: #000; margin-top: 8px; }
.embed-preview iframe { width: 100%; aspect-ratio: 16/9; }

/* ---- 富文本编辑器简易替代 ---- */
.editor-toolbar { display: flex; gap: 4px; padding: 8px; background: #f9fafb; border: 1px solid var(--admin-border); border-bottom: none; border-radius: 8px 8px 0 0; }
.editor-toolbar button {
    padding: 4px 10px; background: #fff; border: 1px solid var(--admin-border); border-radius: 4px;
    cursor: pointer; font-size: .85rem;
}

/* ---- 移动端响应式 ---- */
@media (max-width: 768px) {
    .admin-sidebar { transform: translateX(-100%); }
    .admin-sidebar.open { transform: translateX(0); }
    .admin-main { margin-left: 0; }
    .sidebar-toggle { display: block; }
    .admin-content { padding: 16px; }
    .stat-grid { grid-template-columns: repeat(2, 1fr); }
    .form-row { grid-template-columns: 1fr; }
    .panel-header { flex-direction: column; align-items: flex-start; }
}