:root {
  --primary: #1a56db;
  --primary-dark: #143d9e;
  --primary-light: #e8effd;
  --bg: #f4f6fa;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --success: #16a34a;
  --warning: #d97706;
  --danger: #dc2626;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,.08);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif; background: var(--bg); color: var(--text); font-size: 14px; padding-bottom: 60px; }

/* 顶栏 */
.topbar { background: linear-gradient(135deg, var(--primary), var(--primary-dark)); color: #fff; position: sticky; top: 0; z-index: 100; }
.topbar-inner { max-width: 1100px; margin: 0 auto; padding: 12px 16px; display: flex; justify-content: space-between; align-items: center; }
.brand { color: #fff; text-decoration: none; font-size: 18px; font-weight: 700; letter-spacing: .5px; }
.brand-sub { font-size: 12px; font-weight: 400; opacity: .85; margin-left: 6px; }
.topbar-right { display: flex; align-items: center; gap: 10px; }
.user-badge { font-size: 13px; opacity: .95; }

/* 布局 */
.layout { max-width: 1100px; margin: 0 auto; display: flex; gap: 16px; padding: 16px; align-items: flex-start; }
.sidebar { width: 170px; flex-shrink: 0; background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); padding: 10px; display: none; position: sticky; top: 70px; }
.sidebar a { display: block; padding: 10px 12px; border-radius: 8px; color: var(--text); text-decoration: none; font-size: 14px; margin-bottom: 2px; }
.sidebar a:hover { background: var(--primary-light); }
.sidebar a.active { background: var(--primary); color: #fff; }
.nav-divider { padding: 12px 12px 4px; font-size: 11px; color: var(--muted); }
.content { flex: 1; min-width: 0; }

/* 底部导航（手机） */
.bottom-nav { position: fixed; bottom: 0; left: 0; right: 0; background: #fff; border-top: 1px solid var(--border); display: flex; z-index: 100; }
.bottom-nav a { flex: 1; text-align: center; padding: 8px 0 6px; font-size: 11px; color: var(--muted); text-decoration: none; }
.bottom-nav a span { display: block; font-size: 18px; }
.bottom-nav a.active { color: var(--primary); font-weight: 600; }

/* 卡片 */
.card { background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); padding: 16px; margin-bottom: 14px; }
.card-title { font-size: 15px; font-weight: 700; margin-bottom: 12px; display: flex; justify-content: space-between; align-items: center; }
.card-title small { font-weight: 400; color: var(--muted); font-size: 12px; }

/* 统计卡 */
.stat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin-bottom: 14px; }
.stat-card { background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); padding: 14px; }
.stat-card .num { font-size: 24px; font-weight: 800; color: var(--primary); }
.stat-card .label { font-size: 12px; color: var(--muted); margin-top: 2px; }
.stat-card.warn .num { color: var(--warning); }
.stat-card.danger .num { color: var(--danger); }
.stat-card.ok .num { color: var(--success); }

/* 表格 */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
th { text-align: left; padding: 9px 8px; background: #f8fafc; color: var(--muted); font-weight: 600; white-space: nowrap; border-bottom: 2px solid var(--border); }
td { padding: 9px 8px; border-bottom: 1px solid var(--border); vertical-align: middle; }
tr:hover td { background: #fafbfe; }

/* 徽章 */
.badge { display: inline-block; padding: 2px 8px; border-radius: 20px; font-size: 11px; font-weight: 600; }
.badge-blue { background: var(--primary-light); color: var(--primary); }
.badge-green { background: #dcfce7; color: var(--success); }
.badge-orange { background: #fef3c7; color: var(--warning); }
.badge-red { background: #fee2e2; color: var(--danger); }
.badge-gray { background: #f3f4f6; color: var(--muted); }

/* 按钮 */
.btn { display: inline-block; padding: 8px 14px; border-radius: 8px; border: none; background: var(--primary); color: #fff; font-size: 13px; cursor: pointer; text-decoration: none; }
.btn:hover { background: var(--primary-dark); }
.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn-xs { padding: 3px 8px; font-size: 11px; border-radius: 6px; }
.btn-ghost { background: transparent; color: #fff; border: 1px solid rgba(255,255,255,.5); }
.btn-outline { background: #fff; color: var(--primary); border: 1px solid var(--primary); }
.btn-outline:hover { background: var(--primary-light); }
.btn-danger { background: var(--danger); }
.btn-danger:hover { background: #b91c1c; }
.btn-success { background: var(--success); }
.btn-success:hover { background: #15803d; }
.btn-warn { background: var(--warning); }
.btn-block { display: block; width: 100%; text-align: center; }

/* 表单 */
.form-group { margin-bottom: 12px; }
.form-group label { display: block; font-size: 12px; color: var(--muted); margin-bottom: 4px; font-weight: 600; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 9px 10px; border: 1px solid var(--border); border-radius: 8px; font-size: 14px; background: #fff; }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: var(--primary); }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.form-grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; }
.form-actions { display: flex; gap: 10px; margin-top: 14px; }

/* 任务列表 */
.task-item { display: flex; gap: 12px; padding: 12px; border: 1px solid var(--border); border-radius: 10px; margin-bottom: 10px; background: #fff; }
.task-item.overdue { border-left: 4px solid var(--danger); }
.task-item.done-item { opacity: .75; }
.task-main { flex: 1; min-width: 0; }
.task-title { font-weight: 600; font-size: 14px; margin-bottom: 4px; }
.task-meta { font-size: 12px; color: var(--muted); display: flex; flex-wrap: wrap; gap: 8px; }
.task-side { text-align: right; flex-shrink: 0; }

/* 滤镜条 */
.filter-bar { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; align-items: center; }
.filter-bar select, .filter-bar input { padding: 7px 10px; border: 1px solid var(--border); border-radius: 8px; font-size: 13px; background: #fff; }

/* 凭证图 */
.proof-img { max-width: 100%; border-radius: 8px; border: 1px solid var(--border); margin-top: 8px; }

/* 进度条 */
.progress { background: #eef1f6; border-radius: 20px; height: 8px; overflow: hidden; }
.progress-fill { background: var(--primary); height: 100%; border-radius: 20px; }
.progress-fill.green { background: var(--success); }
.progress-fill.orange { background: var(--warning); }

/* 提醒条 */
.alert { padding: 10px 14px; border-radius: 8px; margin-bottom: 12px; font-size: 13px; }
.alert-info { background: var(--primary-light); color: var(--primary); }
.alert-warn { background: #fef3c7; color: var(--warning); }
.alert-danger { background: #fee2e2; color: var(--danger); }
.alert-success { background: #dcfce7; color: var(--success); }

/* 排行榜 */
.rank-list { display: flex; flex-direction: column; gap: 8px; }
.rank-item { display: flex; align-items: center; gap: 10px; padding: 10px 12px; background: #f8fafc; border-radius: 10px; }
.rank-no { width: 26px; height: 26px; border-radius: 50%; background: #e5e7eb; display: flex; align-items: center; justify-content: center; font-size: 12px; font-weight: 700; }
.rank-no.gold { background: #fbbf24; color: #fff; }
.rank-no.silver { background: #9ca3af; color: #fff; }
.rank-no.bronze { background: #d97706; color: #fff; }
.rank-name { flex: 1; font-weight: 600; }
.rank-val { font-weight: 700; color: var(--primary); }

/* 登录页 */
.login-page { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, #1a56db, #0f2f7a); padding: 20px; }
.login-box { background: #fff; border-radius: 16px; padding: 30px 26px; width: 100%; max-width: 360px; box-shadow: 0 20px 50px rgba(0,0,0,.25); }
.login-logo { text-align: center; font-size: 40px; margin-bottom: 8px; }
.login-title { text-align: center; font-size: 19px; font-weight: 800; margin-bottom: 4px; }
.login-sub { text-align: center; color: var(--muted); font-size: 12px; margin-bottom: 20px; }

/* 分段器 */
.tabs { display: flex; gap: 6px; margin-bottom: 14px; flex-wrap: wrap; }
.tabs a { padding: 7px 14px; border-radius: 20px; background: #eef1f6; color: var(--muted); text-decoration: none; font-size: 13px; }
.tabs a.active { background: var(--primary); color: #fff; }

/* 平板/桌面 */
@media (min-width: 768px) {
  body { padding-bottom: 0; }
  .sidebar { display: block; }
  .bottom-nav { display: none; }
  .stat-grid { grid-template-columns: repeat(4, 1fr); }
  .form-grid { grid-template-columns: 1fr 1fr 1fr; }
  .form-grid-3 { grid-template-columns: repeat(3, 1fr); }
}