/* 校园预约管理系统 - 后台样式 */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #16a34a;
    --warning: #d97706;
    --danger: #dc2626;
    --gray: #64748b;
    --border: #e2e8f0;
    --bg: #f1f5f9;
    --card: #ffffff;
    --text: #1e293b;
    --sidebar: #1e293b;
}

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

body {
    font-family: "PingFang SC", "Microsoft YaHei", -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    font-size: 14px;
}

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

/* 登录页 */
.login-wrap {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #1e3a8a, #2563eb);
    padding: 20px;
}
.login-box {
    background: #fff;
    border-radius: 14px;
    box-shadow: 0 20px 60px rgba(0,0,0,.3);
    padding: 40px;
    width: 100%;
    max-width: 400px;
}
.login-box .login-title { text-align: center; font-size: 22px; font-weight: 700; margin-bottom: 6px; }
.login-box .login-sub { text-align: center; color: var(--gray); font-size: 13px; margin-bottom: 28px; }

/* 后台布局 */
.admin-layout { display: flex; min-height: 100vh; }
.sidebar {
    width: 220px;
    background: var(--sidebar);
    color: #cbd5e1;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
}
.sidebar .logo {
    padding: 20px 20px;
    font-size: 17px;
    font-weight: 700;
    color: #fff;
    border-bottom: 1px solid #334155;
    display: flex;
    align-items: center;
    gap: 8px;
}
.sidebar .menu { flex: 1; padding: 12px 0; }
.sidebar .menu a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 20px;
    color: #cbd5e1;
    font-size: 14px;
    border-left: 3px solid transparent;
    transition: all .15s;
}
.sidebar .menu a:hover { background: #334155; color: #fff; }
.sidebar .menu a.active { background: #334155; color: #fff; border-left-color: var(--primary); }
.sidebar .menu a .icon { width: 18px; text-align: center; }
.sidebar .sidebar-footer { padding: 16px 20px; border-top: 1px solid #334155; font-size: 12px; color: #94a3b8; }

.main { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.topbar {
    background: #fff;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    box-shadow: 0 1px 3px rgba(0,0,0,.06);
}
.topbar .page-title { font-size: 17px; font-weight: 700; }
.topbar .user-info { display: flex; align-items: center; gap: 14px; font-size: 13px; color: var(--gray); }
.topbar .user-info .logout { color: var(--danger); }

.content { padding: 24px; flex: 1; }

/* 卡片 */
.card {
    background: var(--card);
    border-radius: 10px;
    box-shadow: 0 1px 3px rgba(0,0,0,.06);
    padding: 22px;
    margin-bottom: 20px;
}
.card-title { font-size: 16px; font-weight: 700; margin-bottom: 18px; display: flex; align-items: center; gap: 8px; }
.card-title .bar { width: 4px; height: 16px; background: var(--primary); border-radius: 2px; }

/* 统计卡片 */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 16px; margin-bottom: 20px; }
.stat-card {
    background: #fff;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 1px 3px rgba(0,0,0,.06);
    border-left: 4px solid var(--primary);
}
.stat-card .stat-num { font-size: 30px; font-weight: 700; color: var(--text); }
.stat-card .stat-label { font-size: 13px; color: var(--gray); margin-top: 4px; }
.stat-card.green { border-left-color: var(--success); }
.stat-card.orange { border-left-color: var(--warning); }
.stat-card.red { border-left-color: var(--danger); }

/* 表单 */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; color: #334155; }
.form-group label .req { color: var(--danger); }
.form-control {
    width: 100%;
    padding: 9px 12px;
    border: 1px solid var(--border);
    border-radius: 7px;
    font-size: 14px;
    background: #fff;
    transition: border-color .2s, box-shadow .2s;
}
.form-control:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,.12); }
.form-tip { font-size: 12px; color: var(--gray); margin-top: 4px; }
.form-row { display: flex; gap: 16px; flex-wrap: wrap; }
.form-row .form-group { flex: 1; min-width: 180px; }

.btn {
    display: inline-block;
    padding: 9px 18px;
    border: none;
    border-radius: 7px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: background .2s, opacity .2s;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-default { background: #e2e8f0; color: #334155; }
.btn-sm { padding: 5px 12px; font-size: 12px; }
.btn:disabled { opacity: .6; cursor: not-allowed; }
.btn-link { background: none; color: var(--primary); padding: 5px 8px; }

/* 表格 */
.table { width: 100%; border-collapse: collapse; font-size: 13px; }
.table th, .table td { padding: 11px 10px; text-align: left; border-bottom: 1px solid var(--border); }
.table th { background: #f8fafc; font-weight: 600; color: #475569; }
.table tr:hover td { background: #f8fafc; }
.table .actions { white-space: nowrap; }

/* 徽章 */
.badge { display: inline-block; padding: 3px 10px; border-radius: 12px; font-size: 12px; font-weight: 600; }
.badge-pending { background: #fef3c7; color: #92400e; }
.badge-approved { background: #dcfce7; color: #166534; }
.badge-rejected { background: #fee2e2; color: #991b1b; }
.badge-noshow { background: #475569; color: #fff; }
.badge-on { background: #dcfce7; color: #166534; }
.badge-off { background: #fee2e2; color: #991b1b; }

/* 筛选栏 */
.filter-bar { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-bottom: 18px; }
.filter-bar .form-control { width: auto; min-width: 140px; }

/* 消息提示 */
.alert { padding: 11px 15px; border-radius: 7px; margin-bottom: 16px; font-size: 13px; display: none; }
.alert-success { background: #f0fdf4; color: #166534; border: 1px solid #bbf7d0; }
.alert-error { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }

/* 分页 */
.pagination { display: flex; gap: 6px; list-style: none; margin-top: 18px; flex-wrap: wrap; }
.pagination li a, .pagination li span {
    display: inline-block;
    padding: 6px 12px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 13px;
    color: #334155;
    background: #fff;
}
.pagination li.active span { background: var(--primary); color: #fff; border-color: var(--primary); }
.pagination li.disabled span { color: #cbd5e1; }

/* 弹窗 */
.modal-mask {
    position: fixed;
    inset: 0;
    background: rgba(15,23,42,.5);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 100;
    padding: 20px;
}
.modal-mask.show { display: flex; }
.modal {
    background: #fff;
    border-radius: 12px;
    width: 100%;
    max-width: 460px;
    padding: 26px;
    box-shadow: 0 20px 60px rgba(0,0,0,.3);
}
.modal .modal-title { font-size: 17px; font-weight: 700; margin-bottom: 18px; }
.modal .modal-footer { display: flex; gap: 10px; justify-content: flex-end; margin-top: 20px; }

.empty { text-align: center; color: var(--gray); padding: 40px 0; }
.text-muted { color: var(--gray); }
.mt-10 { margin-top: 10px; }

@media (max-width: 768px) {
    .admin-layout { flex-direction: column; }
    .sidebar { width: 100%; }
    .sidebar .menu { display: flex; flex-wrap: wrap; padding: 8px; }
    .sidebar .menu a { border-left: none; padding: 8px 14px; }
    .content { padding: 16px; }
}