:root {
  --bg: #f1f5f9;
  --panel: #ffffff;
  --primary: #3b82f6;
  --primary-d: #2563eb;
  --border: #e2e8f0;
  --text: #0f172a;
  --muted: #64748b;
  --danger: #ef4444;
  --warning: #f59e0b;
  --success: #22c55e;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg); color: var(--text); line-height: 1.6;
}
.loading { padding: 80px; text-align: center; color: var(--muted); }

/* 布局 */
.layout { display: flex; min-height: 100vh; }
.sidebar {
  width: 220px; background: #0f172a; color: #e2e8f0; padding: 18px 0; flex-shrink: 0;
}
.sidebar h1 { font-size: 17px; padding: 0 20px 16px; border-bottom: 1px solid #1e293b; }
.sidebar .nav a {
  display: block; padding: 12px 20px; color: #cbd5e1; text-decoration: none; font-size: 14px; cursor: pointer;
}
.sidebar .nav a:hover, .sidebar .nav a.active { background: #1e293b; color: #fff; border-left: 3px solid var(--primary); }
.sidebar .foot { padding: 14px 20px; font-size: 12px; color: #64748b; border-top: 1px solid #1e293b; margin-top: auto; }
.main { flex: 1; padding: 28px 32px; overflow: auto; }
.main h2 { font-size: 22px; margin-bottom: 6px; }
.subtitle { color: var(--muted); margin-bottom: 20px; font-size: 14px; }

/* 卡片/按钮 */
.card { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 20px 24px; margin-bottom: 20px; box-shadow: 0 1px 3px rgba(0,0,0,.04); }
.btn {
  display: inline-block; padding: 9px 18px; border: none; border-radius: 8px; background: var(--primary);
  color: #fff; font-size: 14px; cursor: pointer; margin-right: 8px; margin-bottom: 8px; text-decoration: none;
}
.btn:hover { background: var(--primary-d); }
.btn.secondary { background: #e2e8f0; color: #0f172a; }
.btn.danger { background: var(--danger); }
.btn.success { background: var(--success); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.spacer { flex: 1; }

/* 表单 */
label { font-size: 13px; color: var(--muted); display: block; margin-bottom: 4px; }
input, select {
  padding: 9px 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 14px; width: 100%;
  background: #fff; color: var(--text);
}
.field { margin-bottom: 14px; max-width: 360px; }
.msg { padding: 10px 14px; border-radius: 8px; margin-bottom: 14px; font-size: 14px; }
.msg.error { background: #fef2f2; border: 1px solid #fecaca; color: #991b1b; }
.msg.ok { background: #f0fdf4; border: 1px solid #bbf7d0; color: #166534; }
.msg.info { background: #eff6ff; border: 1px solid #bfdbfe; color: #1e40af; }

/* 表格 */
.table-wrap { overflow: auto; border: 1px solid var(--border); border-radius: 10px; }
table { border-collapse: collapse; width: 100%; font-size: 13px; background: #fff; }
th, td { border: 1px solid var(--border); padding: 6px 10px; text-align: center; white-space: nowrap; }
th { background: #f8fafc; position: sticky; top: 0; z-index: 2; }
td.editable input { width: 90px; padding: 4px 6px; }
tr:nth-child(even) td { background: #fafbfc; }
.cell-conflict { background: #fee2e2 !important; color: #991b1b; font-weight: 600; }
.cell-special { background: #fef3c7 !important; }
.cell-filled { background: #ecfdf5 !important; }

/* 登录 */
.login-box { max-width: 380px; margin: 90px auto; }
.login-box .card { padding: 32px; }
.legend { font-size: 12px; color: var(--muted); margin-top: 10px; }
.badge { display: inline-block; padding: 2px 10px; border-radius: 999px; font-size: 12px; background: #dbeafe; color: #1e40af; }
.badge.admin { background: #fde68a; color: #92400e; }
.pill { font-size: 12px; color: var(--muted); }