:root {
  --bg: #f4f6f7;
  --surface: #ffffff;
  --text: #1f2d33;
  --muted: #62727a;
  --line: #d9e0e3;
  --primary: #1f6f78;
  --primary-dark: #185860;
  --primary-soft: #e6f2f3;
  --danger: #b3261e;
  --danger-soft: #fdecea;
  --disabled-bg: #eceff1;
  --disabled-text: #a3afb5;
  --radius: 12px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

[hidden] { display: none !important; }

.app {
  max-width: 480px;
  min-height: 100vh;
  min-height: 100dvh;
  margin: 0 auto;
  padding: 0 16px calc(32px + env(safe-area-inset-bottom));
  background: var(--surface);
}

@media (min-width: 520px) {
  .app { box-shadow: 0 0 0 1px var(--line); }
}

/* 頂欄 */
.top {
  display: flex;
  align-items: center;
  gap: 4px;
  min-height: 64px;
  padding: 12px 0 8px;
}
.clinic { margin: 0; font-size: 13px; color: var(--muted); letter-spacing: 0.04em; }
h1 { margin: 0; font-size: 20px; }
h2 { margin: 20px 0 8px; font-size: 18px; }
h3 { margin: 20px 0 8px; font-size: 15px; color: var(--muted); font-weight: 600; }

.back {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  margin-left: -10px;
  border: 0;
  border-radius: 50%;
  background: none;
  color: var(--text);
  cursor: pointer;
}
.back:active { background: var(--disabled-bg); }

/* 步驟進度 */
.progress {
  display: flex;
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
}
.progress li {
  position: relative;
  flex: 1;
  text-align: center;
  font-size: 12px;
  color: var(--disabled-text);
}
.progress li span {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  margin: 0 auto 4px;
  border-radius: 50%;
  background: var(--disabled-bg);
  font-weight: 600;
}
.progress li + li::before {
  content: "";
  position: absolute;
  top: 12px;
  right: 50%;
  width: 100%;
  height: 2px;
  background: var(--disabled-bg);
}
.progress li.is-done, .progress li.is-current { color: var(--primary); }
.progress li.is-done span, .progress li.is-current span { background: var(--primary); color: #fff; }
.progress li.is-done + li::before { background: var(--primary); }
.progress li.is-current { font-weight: 600; }

/* 狀態列 */
.loading {
  margin-top: 16px;
  padding: 10px 12px;
  border-radius: var(--radius);
  background: var(--primary-soft);
  color: var(--primary-dark);
  font-size: 14px;
  text-align: center;
}
.error {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 16px;
  padding: 10px 12px;
  border-radius: var(--radius);
  background: var(--danger-soft);
  color: var(--danger);
  font-size: 14px;
}
.error p { flex: 1; margin: 0; }

main.is-busy { opacity: 0.55; pointer-events: none; }

.hint { margin: 0 0 12px; font-size: 14px; color: var(--muted); }
.legend { margin: 12px 0 0; font-size: 13px; color: var(--muted); }
.empty { grid-column: 1 / -1; margin: 0; padding: 20px 0; text-align: center; color: var(--muted); font-size: 14px; }

/* 療程／醫師卡片 */
.cards { display: grid; gap: 10px; }
.card {
  display: block;
  width: 100%;
  min-height: 64px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}
.card:active, .card:focus-visible { border-color: var(--primary); background: var(--primary-soft); outline: none; }
.card-title { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; font-weight: 600; }
.card-meta { flex: none; font-size: 13px; font-weight: 400; color: var(--primary-dark); }
.card-desc { display: block; margin-top: 2px; font-size: 14px; color: var(--muted); }

/* 日期列 */
.dates {
  display: flex;
  gap: 8px;
  margin: 0 -16px;
  padding: 4px 16px 8px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}
.date {
  flex: none;
  width: 58px;
  min-height: 72px;
  padding: 6px 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: inherit;
  font: inherit;
  text-align: center;
  scroll-snap-align: start;
  cursor: pointer;
}
.date small { display: block; font-size: 12px; color: var(--muted); }
.date strong { display: block; font-size: 18px; line-height: 1.3; }
.date:disabled { background: var(--disabled-bg); color: var(--disabled-text); cursor: not-allowed; }
.date:disabled small { color: var(--disabled-text); }
.date.is-selected { border-color: var(--primary); background: var(--primary); color: #fff; }
.date.is-selected small { color: #fff; }

/* 時段格 */
.slots { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.slot {
  min-height: 48px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  color: inherit;
  font: inherit;
  font-variant-numeric: tabular-nums;
  cursor: pointer;
}
.slot:disabled { border-color: var(--disabled-bg); background: var(--disabled-bg); color: var(--disabled-text); text-decoration: line-through; cursor: not-allowed; }
.slot.is-selected { border-color: var(--primary); background: var(--primary); color: #fff; font-weight: 600; }

/* 按鈕 */
.btn {
  display: block;
  width: 100%;
  min-height: 48px;
  margin-top: 16px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.btn-primary { border-color: var(--primary); background: var(--primary); color: #fff; }
.btn-primary:active { background: var(--primary-dark); }
.btn-primary:disabled { border-color: var(--disabled-bg); background: var(--disabled-bg); color: var(--disabled-text); cursor: not-allowed; }
.btn-danger { border-color: var(--danger); color: var(--danger); }
.btn-small { width: auto; min-height: 44px; margin: 0; border-color: currentColor; background: none; color: inherit; }

/* 表單 */
.field { display: block; margin: 0 0 16px; padding: 0; border: 0; }
.field > span, .field > legend { display: block; margin-bottom: 6px; padding: 0; font-size: 14px; font-weight: 600; }
input[type="text"], input[type="tel"], textarea {
  width: 100%;
  min-height: 48px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  color: inherit;
  font: inherit;
}
textarea { resize: vertical; }
input:focus-visible, textarea:focus-visible { border-color: var(--primary); outline: 2px solid var(--primary-soft); }
.is-invalid { border-color: var(--danger) !important; }
.field-error { display: block; min-height: 0; color: var(--danger); font-size: 13px; }
.field-error:empty { display: none; }

.segmented { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.segmented input { position: absolute; opacity: 0; }
.segmented span {
  display: grid;
  place-items: center;
  min-height: 48px;
  border: 1px solid var(--line);
  border-radius: 10px;
  cursor: pointer;
}
.segmented input:checked + span { border-color: var(--primary); background: var(--primary); color: #fff; font-weight: 600; }
.segmented input:focus-visible + span { outline: 2px solid var(--primary-soft); }

.consent { display: flex; gap: 10px; align-items: flex-start; min-height: 44px; font-size: 14px; cursor: pointer; }
.consent input { flex: none; width: 22px; height: 22px; margin: 1px 0 0; accent-color: var(--primary); }

/* 摘要 */
.summary {
  margin: 12px 0 0;
  padding: 4px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.summary div { display: flex; gap: 12px; padding: 10px 0; }
.summary div + div { border-top: 1px solid var(--line); }
.summary dt { flex: none; width: 5em; color: var(--muted); font-size: 14px; }
.summary dd { flex: 1; margin: 0; word-break: break-word; white-space: pre-wrap; }

.code-label { margin: 16px 0 0; font-size: 13px; color: var(--muted); text-align: center; }
.code { margin: 0 0 4px; font-size: 28px; font-weight: 700; letter-spacing: 0.12em; text-align: center; color: var(--primary-dark); }
#done-hint { margin-top: 12px; }

/* 頂欄右側動作 */
.top-title { flex: 1; min-width: 0; }
.top-action { flex: none; padding: 0 14px; border-color: var(--line); color: var(--primary-dark); font-size: 14px; }

/* 我的預約 */
.booking {
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.booking-when { margin: 0; font-weight: 600; font-variant-numeric: tabular-nums; }
.booking-what { margin: 2px 0 0; font-size: 14px; color: var(--muted); }
.booking .btn { margin-top: 12px; }
.booking.is-past { background: var(--bg); }
.booking.is-past .booking-when { color: var(--muted); }
.badge {
  display: inline-block;
  margin-left: 8px;
  padding: 1px 8px;
  border-radius: 999px;
  background: var(--disabled-bg);
  color: var(--muted);
  font-size: 12px;
  font-weight: 400;
  vertical-align: middle;
}

/* 無法繼續的錯誤畫面 */
.fatal-text { margin: 0 0 8px; color: var(--muted); white-space: pre-wrap; }

/* 頁面內確認對話框（不使用原生 confirm） */
.dialog {
  position: fixed;
  inset: 0;
  z-index: 10;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 16px 16px calc(16px + env(safe-area-inset-bottom));
  background: rgba(31, 45, 51, 0.45);
}
.dialog-box {
  width: 100%;
  max-width: 448px;
  padding: 20px 16px 16px;
  border-radius: 16px;
  background: var(--surface);
}
.dialog-box p { margin: 0 0 4px; font-weight: 600; white-space: pre-wrap; }
@media (min-width: 520px) {
  .dialog { align-items: center; }
}