:root {
  --sidebar-bg: #1f2937;
  --sidebar-active: #111827;
  --brand: #2563eb;
  --bg: #f3f4f6;
  --card: #ffffff;
  --border: #e5e7eb;
  --text: #111827;
  --muted: #6b7280;
  --green: #16a34a;
  --red: #dc2626;
  --orange: #d97706;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
}

/* 布局 */
.layout { display: flex; min-height: 100vh; }
.sidebar {
  width: 220px; background: var(--sidebar-bg); color: #d1d5db;
  display: flex; flex-direction: column; flex-shrink: 0;
}
.sidebar .logo {
  padding: 20px 18px; font-size: 16px; font-weight: 600; color: #fff;
  border-bottom: 1px solid #374151;
}
.sidebar nav { flex: 1; padding: 12px 0; }
.sidebar nav a {
  display: block; padding: 11px 18px; color: #d1d5db; text-decoration: none;
  border-left: 3px solid transparent;
}
.sidebar nav a:hover { background: var(--sidebar-active); color: #fff; }
.sidebar nav a.active {
  background: var(--sidebar-active); color: #fff; border-left-color: var(--brand);
}
.sidebar .foot { padding: 14px 18px; border-top: 1px solid #374151; font-size: 12px; }
.sidebar .foot a { color: #9ca3af; text-decoration: none; }

.main { flex: 1; padding: 24px 28px; overflow-x: auto; }
.page-title { font-size: 20px; font-weight: 600; margin-bottom: 18px; }

/* 卡片 */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; margin-bottom: 22px; }
.stat-card {
  background: var(--card); border: 1px solid var(--border); border-radius: 8px; padding: 18px;
}
.stat-card .label { color: var(--muted); font-size: 13px; }
.stat-card .value { font-size: 26px; font-weight: 700; margin-top: 6px; }

.panel {
  background: var(--card); border: 1px solid var(--border); border-radius: 8px;
  padding: 18px; margin-bottom: 20px;
}
.panel h3 { font-size: 15px; margin-bottom: 12px; }

/* 表格 */
table { width: 100%; border-collapse: collapse; }
th, td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--border); }
th { background: #f9fafb; color: var(--muted); font-weight: 600; font-size: 13px; }
tr:hover td { background: #f9fafb; }

/* 徽章 */
.badge { padding: 2px 8px; border-radius: 10px; font-size: 12px; }
.badge.pending { background: #fef3c7; color: var(--orange); }
.badge.paid { background: #dcfce7; color: var(--green); }
.badge.refunded { background: #fee2e2; color: var(--red); }
.badge.closed { background: #e5e7eb; color: var(--muted); }
.badge.on { background: #dcfce7; color: var(--green); }
.badge.off { background: #fee2e2; color: var(--red); }

/* 按钮 */
.btn {
  display: inline-block; padding: 7px 14px; border-radius: 6px; border: none;
  cursor: pointer; font-size: 13px; text-decoration: none;
}
.btn-primary { background: var(--brand); color: #fff; }
.btn-danger { background: var(--red); color: #fff; }
.btn-sm { padding: 4px 10px; font-size: 12px; }
.btn:hover { opacity: 0.9; }

/* 表单 */
.toolbar { display: flex; gap: 10px; margin-bottom: 14px; flex-wrap: wrap; align-items: center; }
input, select {
  padding: 7px 10px; border: 1px solid var(--border); border-radius: 6px; font-size: 13px;
}
label { font-size: 13px; color: var(--muted); }

/* 分页 */
.pagination { margin-top: 14px; display: flex; gap: 6px; }
.pagination a, .pagination span {
  padding: 5px 10px; border: 1px solid var(--border); border-radius: 4px;
  text-decoration: none; color: var(--text); font-size: 13px;
}
.pagination .current { background: var(--brand); color: #fff; border-color: var(--brand); }

/* 登录页 */
.login-wrap {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, #1e3a8a, #2563eb);
}
.login-box {
  background: #fff; padding: 36px; border-radius: 12px; width: 340px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.2);
}
.login-box h2 { text-align: center; margin-bottom: 22px; }
.login-box input { width: 100%; margin-bottom: 14px; padding: 10px; }
.login-box .btn { width: 100%; padding: 10px; }
.error-msg { color: var(--red); text-align: center; margin-bottom: 10px; }

.muted { color: var(--muted); font-size: 12px; }
.mt { margin-top: 10px; }