/* 手機優先的簡單樣式 */
:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #1f2328;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-text: #ffffff;
  --good: #15803d;
  --bad: #c2410c;
  --danger: #b91c1c;
  --border: #e3e5e8;
  --warn-bg: #fff7e6;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  font-size: 17px;
  line-height: 1.5;
}

a { color: var(--primary); }

.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 10px 16px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}
.brand { font-weight: 700; text-decoration: none; color: var(--text); }
.topbar nav { display: flex; gap: 14px; flex-wrap: wrap; justify-content: flex-end; font-size: 15px; }
.topbar nav a { text-decoration: none; }
.who { font-weight: 700; }

main { max-width: 720px; margin: 0 auto; padding: 16px; }

h1 { font-size: 24px; margin: 8px 0 16px; }
h2 { font-size: 19px; margin: 0 0 8px; }
h3 { font-size: 16px; margin: 20px 0 8px; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  margin-bottom: 14px;
}
.narrow { max-width: 420px; margin-left: auto; margin-right: auto; }

.muted { color: var(--muted); }
.small { font-size: 14px; }
.good { color: var(--good); font-weight: 700; }
.bad { color: var(--bad); font-weight: 700; }
.warn { background: var(--warn-bg); border-radius: 8px; padding: 8px 12px; }
.mono { font-family: ui-monospace, Consolas, monospace; letter-spacing: 2px; }

/* 表單 */
label { display: block; margin-bottom: 14px; font-weight: 600; }
input, textarea {
  display: block; width: 100%;
  margin-top: 6px; padding: 12px;
  font-size: 18px; font-family: inherit;
  border: 1px solid #c9ccd1; border-radius: 10px;
  background: #fff; color: var(--text);
}
input:disabled { background: #eee; color: var(--muted); }
.two-col { display: grid; gap: 0 12px; }
@media (min-width: 560px) { .two-col { grid-template-columns: 1fr 1fr; } }

.btn {
  display: inline-block;
  padding: 10px 18px;
  font-size: 17px; font-family: inherit; font-weight: 600;
  border: 1px solid #c9ccd1; border-radius: 10px;
  background: #fff; color: var(--text);
  text-decoration: none; text-align: center; cursor: pointer;
}
.btn.primary { background: var(--primary); border-color: var(--primary); color: var(--primary-text); }
.btn.big { width: 100%; padding: 14px; font-size: 18px; }
.btn.danger { color: var(--danger); border-color: var(--danger); }
.btn.warn-btn { color: var(--bad); border-color: var(--bad); }
.btn.done { color: var(--good); border-color: var(--good); }
.small-btn { padding: 6px 10px; font-size: 14px; }
.actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-top: 14px; }
.actions form { margin: 0; }

.flash { padding: 12px 14px; border-radius: 10px; margin-bottom: 12px; font-weight: 600; }
.flash.error { background: #fde8e8; color: var(--danger); }
.flash.success { background: #e7f6ec; color: var(--good); }

.hero { text-align: center; }
.hero h1 { margin: 4px 0 6px; }
.hero p { margin: 0 0 14px; }
.item .btn.big { margin-top: 4px; }

.teacher-login summary { cursor: pointer; color: var(--muted); }
.teacher-login form { margin-top: 12px; }

/* 學生點數 */
.points-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.label { color: var(--muted); font-size: 14px; }
.big-number { font-size: 40px; font-weight: 800; line-height: 1.1; }
.points .small { text-align: right; }

/* 物品卡片 */
.item { padding: 0; overflow: hidden; }
.item .item-body { padding: 16px; }
.photo { display: block; width: 100%; max-height: 360px; object-fit: contain; background: #eef0f3; }
.preview { display: block; max-width: 220px; border-radius: 10px; margin: -6px 0 14px; }
.item-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 10px; }
.item-head h1, .item-head h2 { margin: 0; }
.desc { white-space: pre-line; margin: 8px 0; }
.status-ended { opacity: 0.85; }

.badge { flex-shrink: 0; font-size: 13px; font-weight: 700; padding: 3px 10px; border-radius: 999px; }
.badge.active { background: #e7f6ec; color: var(--good); }
.badge.upcoming { background: #e8effd; color: var(--primary); }
.badge.ended { background: #eceef1; color: var(--muted); }

.facts { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 12px 0; }
.facts div { background: #f7f8fa; border-radius: 10px; padding: 8px 10px; }
.facts dt { font-size: 13px; color: var(--muted); }
.facts dd { margin: 0; font-size: 18px; font-weight: 700; }
.lead-msg { min-height: 1.5em; margin: 6px 0; }

.bid-form { display: flex; gap: 10px; }
.bid-form input { margin: 0; }
.bid-form .btn { flex-shrink: 0; padding: 0 24px; }

.result-box { background: #f7f8fa; border-radius: 10px; padding: 12px; margin-top: 8px; font-size: 18px; }

/* 老師列表 */
.page-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.page-head h1 { margin: 8px 0; }
.row-link { display: flex; gap: 12px; align-items: center; text-decoration: none; color: inherit; }
.thumb { width: 72px; height: 72px; object-fit: cover; border-radius: 10px; flex-shrink: 0; background: #eef0f3; }
.thumb.empty { display: flex; align-items: center; justify-content: center; font-size: 12px; color: var(--muted); }
.row-main { flex: 1; min-width: 0; }

.table { width: 100%; border-collapse: collapse; font-size: 16px; }
.table th, .table td { padding: 8px 6px; border-bottom: 1px solid var(--border); text-align: left; }
.table th { font-size: 14px; color: var(--muted); }
.table tr.top td { font-weight: 700; color: var(--good); }

/* 密碼 */
.seat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(76px, 1fr)); gap: 8px; }
.seat-grid form { margin: 0; }
.seat-btn { width: 100%; padding: 8px 4px; font-size: 15px; line-height: 1.3; }
.seat-btn.none { border-style: dashed; color: var(--muted); }
.slips { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 8px; margin: 12px 0; }
.slip { border: 1px dashed #999; border-radius: 8px; padding: 10px; font-size: 16px; break-inside: avoid; }
.slip-title { font-size: 12px; color: var(--muted); }

@media print {
  body { background: #fff; }
  .no-print { display: none !important; }
  .card { border: none; padding: 0; }
  main { max-width: none; }
  .slips { grid-template-columns: repeat(4, 1fr); }
}