/* 后台管理系统通用样式 (严谨中规中矩) */
:root {
    --admin-bg: #f1f5f9;
    --admin-card: #ffffff;
    --admin-primary: #122646;
    --admin-primary-hover: #0a172c;
    --admin-border: #e2e8f0;
    --admin-text: #1e293b;
    --admin-muted: #64748b;
    --admin-success: #10b981;
    --admin-danger: #ef4444;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--admin-bg);
    color: var(--admin-text);
    line-height: 1.5;
    font-size: 14px;
}

/* 顶部导航 */
.admin-navbar {
    background: var(--admin-primary);
    color: #ffffff;
    padding: 0 20px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}

.admin-navbar .brand {
    font-size: 15.5px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
    color: #ffffff;
    text-decoration: none;
}

.admin-nav-links {
    display: flex;
    align-items: center;
    gap: 12px;
}

.admin-nav-links a {
    color: rgba(255, 255, 255, 0.85);
    text-decoration: none;
    font-size: 13px;
    padding: 6px 12px;
    border-radius: 5px;
    transition: all 0.15s;
}

.admin-nav-links a:hover,
.admin-nav-links a.active {
    background: rgba(255, 255, 255, 0.18);
    color: #ffffff;
}

/* 内容布局 */
.admin-container {
    max-width: 1100px;
    margin: 24px auto;
    padding: 0 16px;
}

.admin-card {
    background: var(--admin-card);
    border-radius: 8px;
    border: 1px solid var(--admin-border);
    box-shadow: 0 1px 3px rgba(0,0,0,0.04);
    overflow: hidden;
    margin-bottom: 20px;
}

.admin-card-header {
    padding: 14px 18px;
    border-bottom: 1px solid var(--admin-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    background: #ffffff;
}

.admin-card-header h3 {
    font-size: 15px;
    font-weight: 700;
    color: var(--admin-primary);
}

.admin-card-body {
    padding: 18px;
}

/* 按钮规范 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    height: 36px;
    padding: 0 14px;
    font-size: 13px;
    font-weight: 600;
    border-radius: 5px;
    cursor: pointer;
    text-decoration: none;
    border: 1px solid transparent;
    transition: all 0.15s;
    box-sizing: border-box;
    line-height: 1;
}

.btn-primary {
    background: var(--admin-primary);
    color: #ffffff;
    border-color: var(--admin-primary);
}

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

.btn-success {
    background: #059669;
    color: #ffffff;
    border-color: #059669;
}

.btn-success:hover {
    background: #047857;
}

.btn-danger {
    background: #dc2626;
    color: #ffffff;
    border-color: #dc2626;
}

.btn-danger:hover {
    background: #b91c1c;
}

.btn-outline {
    background: #ffffff;
    border-color: #cbd5e1;
    color: var(--admin-text);
}

.btn-outline:hover {
    background: #f8fafc;
    border-color: #94a3b8;
}

.btn-sm {
    height: 28px;
    padding: 0 9px;
    font-size: 12px;
    border-radius: 4px;
}

/* 搜索与工具条 */
.toolbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    flex-wrap: wrap;
    gap: 12px;
}

.search-box {
    display: flex;
    gap: 8px;
    align-items: center;
}

.search-box input {
    height: 36px;
    padding: 0 12px;
    border: 1px solid #cbd5e1;
    border-radius: 5px;
    font-size: 13px;
    outline: none;
    width: 240px;
}

.search-box input:focus {
    border-color: var(--admin-primary);
    box-shadow: 0 0 0 2.5px rgba(18, 38, 70, 0.1);
}

/* 表格规范 */
.admin-table-wrapper {
    overflow-x: auto;
}

.admin-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.admin-table th,
.admin-table td {
    padding: 12px 14px;
    border-bottom: 1px solid var(--admin-border);
    vertical-align: middle;
}

.admin-table th {
    background: #f8fafc;
    font-weight: 600;
    color: var(--admin-muted);
    font-size: 12.5px;
}

.admin-table tbody tr:hover {
    background-color: #f8fafc;
}

/* 状态标签 */
.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
    line-height: 1.4;
}

.badge-success {
    background: #d1fae5;
    color: #065f46;
}

.badge-danger {
    background: #fee2e2;
    color: #991b1b;
}

/* 表单控件 */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 6px;
    font-size: 13px;
    color: #334155;
}

.form-control {
    width: 100%;
    height: 38px;
    padding: 0 12px;
    border: 1px solid #cbd5e1;
    border-radius: 5px;
    font-size: 13.5px;
    box-sizing: border-box;
}

textarea.form-control {
    height: auto;
    padding: 10px 12px;
}

.form-control:focus {
    outline: none;
    border-color: var(--admin-primary);
    box-shadow: 0 0 0 3px rgba(18, 38, 70, 0.1);
}

/* 提示卡片 */
.alert {
    padding: 12px 16px;
    border-radius: 6px;
    margin-bottom: 16px;
    font-size: 13px;
}

.alert-success { background: #d1fae5; color: #065f46; border: 1px solid #a7f3d0; }
.alert-danger { background: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }