/* 預約頁面樣式 — 淺色為主,並支援系統深色模式。 */

:root {
  --bg: #f6f5f2;
  --surface: #ffffff;
  --border: #e3e0d9;
  --border-strong: #cfcbc1;
  --text: #22201c;
  --text-muted: #6f6a61;
  --accent: #1f4d6b;
  --accent-soft: #eaf1f6;
  --accent-contrast: #ffffff;
  --danger: #a8352a;
  --disabled-bg: #f1efea;
  --disabled-text: #b3aea4;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(34, 32, 28, 0.05), 0 8px 24px rgba(34, 32, 28, 0.04);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17181a;
    --surface: #1f2124;
    --border: #33363a;
    --border-strong: #474b51;
    --text: #e9e7e3;
    --text-muted: #9d9a94;
    --accent: #7fb3d5;
    --accent-soft: #253640;
    --accent-contrast: #12171a;
    --danger: #e0817a;
    --disabled-bg: #232529;
    --disabled-text: #5b5e63;
    --shadow: none;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, 'Segoe UI', 'Noto Sans TC', 'Noto Sans JP',
    'Hiragino Sans', 'Microsoft JhengHei', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.page {
  max-width: 560px;
  margin: 0 auto;
  padding: 32px 20px 64px;
}

/* --- 頁首 --- */

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.title {
  margin: 0;
  font-size: 1.55rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.lang-switch {
  display: flex;
  gap: 2px;
  padding: 2px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
}

.lang-btn {
  padding: 5px 12px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--text-muted);
  font: inherit;
  font-size: 0.82rem;
  cursor: pointer;
}

.lang-btn:hover {
  color: var(--text);
}

.lang-btn[aria-pressed='true'] {
  background: var(--accent);
  color: var(--accent-contrast);
}

.intro {
  margin: 8px 0 28px;
  color: var(--text-muted);
}

/* --- 卡片與步驟標題 --- */

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px;
  margin-bottom: 18px;
}

.step {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-size: 1rem;
  font-weight: 600;
}

.step-num {
  display: grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  flex: none;
}

.hint {
  margin: 12px 0 0;
  color: var(--text-muted);
  font-size: 0.86rem;
}

.hint:empty {
  display: none;
}

.timezone-note {
  text-align: center;
  margin-top: 20px;
}

/* --- 月曆 --- */

.month-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.month-label {
  font-weight: 600;
  font-size: 0.95rem;
}

.month-btn {
  width: 32px;
  height: 32px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
}

.month-btn:hover:not(:disabled) {
  border-color: var(--border-strong);
}

.month-btn:disabled {
  opacity: 0.35;
  cursor: default;
}

.weekday-row,
.day-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
}

.weekday-row {
  margin-bottom: 4px;
}

.weekday-row span {
  text-align: center;
  font-size: 0.72rem;
  color: var(--text-muted);
  padding: 4px 0;
}

.day {
  aspect-ratio: 1;
  min-height: 40px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--disabled-text);
  font: inherit;
  font-size: 0.9rem;
  cursor: default;
}

.day.is-open {
  background: var(--surface);
  border-color: var(--border-strong);
  color: var(--text);
  cursor: pointer;
}

.day.is-open:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
}

.day.is-selected {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-contrast);
  font-weight: 600;
}

.day.is-empty {
  visibility: hidden;
}

/* --- 時段 --- */

.slot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(86px, 1fr));
  gap: 8px;
}

.slot-grid:empty {
  display: none;
}

.slot {
  padding: 10px 4px;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-size: 0.92rem;
  font-variant-numeric: tabular-nums;
  cursor: pointer;
}

.slot:hover:not(:disabled) {
  background: var(--accent-soft);
  border-color: var(--accent);
}

.slot:disabled {
  background: var(--disabled-bg);
  border-color: transparent;
  color: var(--disabled-text);
  cursor: default;
  text-decoration: line-through;
}

.slot.is-selected {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-contrast);
  font-weight: 600;
}

/* --- 表單 --- */

.summary {
  margin: 0 0 18px;
  padding: 10px 14px;
  background: var(--accent-soft);
  border-radius: 8px;
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 600;
}

.field {
  margin-bottom: 16px;
}

.field label {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin-bottom: 6px;
  font-size: 0.88rem;
  font-weight: 500;
}

.required {
  color: var(--danger);
}

.optional {
  color: var(--text-muted);
  font-size: 0.78rem;
  font-weight: 400;
}

input,
select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-size: 0.95rem;
}

input:focus,
select:focus,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

input[aria-invalid='true'] {
  border-color: var(--danger);
}

.phone-row {
  display: grid;
  grid-template-columns: minmax(110px, 38%) 1fr;
  gap: 8px;
}

.field-error,
.form-error {
  margin: 6px 0 0;
  color: var(--danger);
  font-size: 0.82rem;
}

.form-error {
  margin: 0 0 14px;
  padding: 10px 12px;
  border-radius: 8px;
  background: color-mix(in srgb, var(--danger) 10%, transparent);
}

.submit,
.secondary {
  width: 100%;
  padding: 13px;
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-contrast);
  font: inherit;
  font-size: 0.98rem;
  font-weight: 600;
  cursor: pointer;
}

.submit:hover:not(:disabled),
.secondary:hover {
  filter: brightness(1.08);
}

.submit:disabled {
  background: var(--disabled-bg);
  color: var(--disabled-text);
  cursor: default;
}

.secondary {
  margin-top: 20px;
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--border-strong);
}

/* --- 成功畫面 --- */

.success {
  text-align: center;
  padding: 36px 24px;
}

.success h2 {
  margin: 0 0 8px;
  font-size: 1.2rem;
}

.success p {
  margin: 0;
  color: var(--text-muted);
}

.success-mark {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 1.5rem;
}

@media (max-width: 420px) {
  .page {
    padding: 24px 14px 48px;
  }

  .card {
    padding: 18px 16px;
  }

  .slot-grid {
    grid-template-columns: repeat(auto-fill, minmax(76px, 1fr));
  }
}