:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --line: #e5e7eb;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --green: #16a34a;
  --red: #dc2626;
  --amber: #d97706;
  --radius: 14px;
  --shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
.page { max-width: 560px; margin: 0 auto; padding: 28px 16px 60px; }
.hero { text-align: center; margin-bottom: 18px; }
.hero h1 { margin: 0 0 6px; font-size: 28px; }
.hero p { margin: 0; color: var(--muted); font-size: 14px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 20px; }
.form { display: flex; flex-direction: column; gap: 14px; }
.form label { display: flex; flex-direction: column; gap: 6px; font-size: 14px; font-weight: 600; }
.form input, .form textarea, .form select {
  font: inherit; padding: 11px 12px; border: 1px solid var(--line); border-radius: 10px;
  background: #fafbfc; color: var(--text); outline: none; transition: border .15s, box-shadow .15s;
}
.form input:focus, .form textarea:focus, .form select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(37,99,235,.12); background: #fff; }
.form button {
  cursor: pointer; border: 0; border-radius: 10px; padding: 13px 16px; font-size: 16px; font-weight: 700;
  background: var(--primary); color: #fff; transition: background .15s;
}
.form button:hover { background: var(--primary-dark); }
.form button:disabled { opacity: .6; cursor: not-allowed; }
.msg { min-height: 22px; font-size: 14px; }
.msg.success { color: var(--green); }
.msg.error { color: var(--red); }
.foot { text-align: center; color: var(--muted); font-size: 12px; margin-top: 20px; }

/* admin */
.admin-shell { max-width: 1160px; margin: 0 auto; padding: 20px 16px 60px; }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 18px; flex-wrap: wrap; }
.topbar h1 { margin: 0; font-size: 22px; }
.topbar .actions { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.btn {
  cursor: pointer; border: 1px solid var(--line); background: #fff; color: var(--text);
  border-radius: 9px; padding: 8px 12px; font: inherit; font-size: 14px; transition: all .15s;
}
.btn:hover { border-color: var(--primary); color: var(--primary); }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-dark); }
.btn.danger { color: var(--red); }
.btn.danger:hover { border-color: var(--red); background: #fff1f1; }
.tabs { display: flex; gap: 6px; border-bottom: 1px solid var(--line); margin-bottom: 18px; flex-wrap: wrap; }
.tab { cursor: pointer; border: 0; background: transparent; padding: 10px 14px; font: inherit; font-size: 15px; color: var(--muted); border-bottom: 2px solid transparent; }
.tab.active { color: var(--primary); border-bottom-color: var(--primary); font-weight: 700; }
.panel { display: none; }
.panel.active { display: block; }
.kpis { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; margin-bottom: 18px; }
.kpi { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow); }
.kpi .label { color: var(--muted); font-size: 13px; }
.kpi .value { font-size: 26px; font-weight: 800; margin-top: 4px; }
.kpi .sub { font-size: 12px; color: var(--muted); margin-top: 2px; }
.kpi.green .value { color: var(--green); }
.kpi.red .value { color: var(--red); }
.chart-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow); margin-bottom: 18px; }
.chart-card h3 { margin: 0 0 12px; font-size: 16px; }
.toolbar { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 14px; align-items: center; }
.toolbar input, .toolbar select { font: inherit; padding: 8px 10px; border: 1px solid var(--line); border-radius: 9px; background: #fff; }
.table-wrap { overflow-x: auto; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); }
table { width: 100%; border-collapse: collapse; font-size: 13px; min-width: 860px; }
th, td { padding: 10px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; white-space: nowrap; }
th { background: #f8fafc; font-weight: 700; position: sticky; top: 0; }
td.wrap { white-space: normal; min-width: 150px; }
tr:hover td { background: #fafbff; }
.tag { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 12px; background: #eef2ff; color: var(--primary); }
.tag.sold { background: #ecfdf5; color: var(--green); }
.muted { color: var(--muted); }
.empty { padding: 30px; text-align: center; color: var(--muted); }
.login-wrap { max-width: 380px; margin: 60px auto; padding: 20px; }
.modal-mask { position: fixed; inset: 0; background: rgba(15,23,42,.45); display: none; align-items: center; justify-content: center; padding: 16px; z-index: 20; }
.modal-mask.show { display: flex; }
.modal { background: #fff; border-radius: var(--radius); width: 100%; max-width: 480px; padding: 20px; max-height: 90vh; overflow-y: auto; }
.modal h3 { margin: 0 0 14px; }
.modal .grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.modal label { display: flex; flex-direction: column; gap: 6px; font-size: 13px; font-weight: 600; }
.modal input, .modal select, .modal textarea { font: inherit; padding: 9px 10px; border: 1px solid var(--line); border-radius: 9px; }
.modal .full { grid-column: 1 / -1; }
.modal .btns { display: flex; justify-content: flex-end; gap: 8px; margin-top: 16px; }
.stat-table td, .stat-table th { white-space: nowrap; }
@media (max-width: 640px) {
  .modal .grid { grid-template-columns: 1fr; }
}

.toast {
  position: fixed; top: 18px; left: 50%; transform: translateX(-50%) translateY(-12px);
  background: rgba(17, 24, 39, 0.94); color: #fff; padding: 11px 16px; border-radius: 10px;
  font-size: 14px; line-height: 1.5; z-index: 100; opacity: 0; max-width: 90vw; text-align: center;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.18); transition: opacity .25s ease, transform .25s ease;
}
.toast.success { background: #16a34a; }
.toast.error { background: #dc2626; }
.toast.info { background: rgba(17, 24, 39, 0.94); }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }