/* ── Countdown Timer ── token-based theme system ── */

:root {
  --bg: #F7F7F5;
  --surface: #FFFFFF;
  --surface-2: #F0F0EC;
  --text: #1A1A1A;
  --text-2: #5C5C56;
  --border: #E2E2DD;
  --accent: #C94A1B;
  --accent-hover: #AE3F15;
  --accent-text: #FFFFFF;
  --countdown-bg: linear-gradient(135deg, #1A1A1A 0%, #2D2D2D 100%);
  --countdown-text: #FFFFFF;
  --countdown-num: #FF8C42;
  --input-bg: #FFFFFF;
  --input-border: #D4D4CF;
  --input-focus: #E85D2A;
  --btn-secondary-bg: #FFFFFF;
  --btn-secondary-text: #1A1A1A;
  --btn-secondary-border: #D4D4CF;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
}

body[data-theme="dark"] {
  --bg: #111113;
  --surface: #1C1C1F;
  --surface-2: #252528;
  --text: #ECECEC;
  --text-2: #9C9C96;
  --border: #333336;
  --accent: #FF8C42;
  --accent-hover: #FFA366;
  --accent-text: #111113;
  --countdown-bg: linear-gradient(135deg, #0A0A0A 0%, #1A1A1A 100%);
  --countdown-text: #ECECEC;
  --countdown-num: #FF8C42;
  --input-bg: #252528;
  --input-border: #404044;
  --input-focus: #FF8C42;
  --btn-secondary-bg: #252528;
  --btn-secondary-text: #ECECEC;
  --btn-secondary-border: #404044;
  --shadow: 0 1px 3px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.3);
}

/* ── Reset ── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft JhengHei', sans-serif;
  line-height: 1.6;
  background: var(--bg);
  color: var(--text);
  transition: background 0.3s, color 0.3s;
  min-height: 100vh;
}

/* ── Layout ── */
.container {
  max-width: 520px;
  margin: 0 auto;
  padding: 32px 20px 48px;
}

/* ── Header ── */
.header {
  text-align: center;
  margin-bottom: 32px;
}

.header h1 {
  font-size: 1.75rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.header h1::before {
  content: '⏱';
  font-size: 1.5rem;
}

/* ── Countdown Display ── */
.countdown-display {
  margin: 0 0 28px;
  padding: 28px 24px;
  background: var(--countdown-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  border: none;
}

.time-info {
  margin-bottom: 20px;
}

.time-info p {
  margin-bottom: 6px;
  font-size: 0.875rem;
  color: var(--countdown-text);
  opacity: 0.7;
}

.countdown-text {
  font-size: 1.5rem;
  font-weight: 700;
  padding: 16px 20px;
  border: 2px solid rgba(255,140,66,0.3);
  border-radius: var(--radius-sm);
  text-align: center;
  background: rgba(255,140,66,0.08);
  color: var(--countdown-num);
  font-variant-numeric: tabular-nums;
  letter-spacing: 1px;
}

/* ── Sections (cards) ── */
.event-setup,
.theme-selector,
.button-section,
.reminder-settings {
  margin: 0 0 16px;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.instruction {
  margin-bottom: 16px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
}

/* ── Form ── */
.form-group {
  margin-bottom: 16px;
}

.form-group:last-child {
  margin-bottom: 0;
}

.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--text-2);
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

.form-group input {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--input-border);
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  background: var(--input-bg);
  color: var(--text);
  transition: border-color 0.2s, box-shadow 0.2s;
  min-height: 46px;
}

.form-group input::placeholder {
  color: var(--text-2);
  opacity: 0.6;
}

.form-group input:focus {
  outline: none;
  border-color: var(--input-focus);
  box-shadow: 0 0 0 3px rgba(232,93,42,0.12);
}

.form-group input[type="datetime-local"] {
  padding: 12px 14px;
  font-size: 0.9375rem;
  min-height: 46px;
}

/* ── Buttons ── */
.button-group {
  display: flex;
  gap: 10px;
}

.button-section .button-group + .button-group {
  margin-top: 10px;
}

.btn {
  padding: 11px 20px;
  border: 1.5px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  flex: 1;
  min-width: 0;
  text-align: center;
}

.btn.primary {
  background: var(--accent);
  color: var(--accent-text);
  border-color: var(--accent);
}

.btn.primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  box-shadow: 0 2px 8px rgba(232,93,42,0.25);
}

.btn.primary:active {
  transform: scale(0.98);
}

.btn.secondary {
  background: var(--btn-secondary-bg);
  color: var(--btn-secondary-text);
  border-color: var(--btn-secondary-border);
}

.btn.secondary:hover {
  background: var(--surface-2);
  border-color: var(--text-2);
}

/* ── Section titles ── */
.theme-selector h3,
.reminder-settings h3 {
  margin-bottom: 12px;
  font-size: 0.9375rem;
  font-weight: 600;
}

/* ── Radio / Checkbox labels ── */
.theme-selector label,
.reminder-option label,
.reminder-times label {
  position: relative;
  margin-right: 16px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
  padding: 6px 12px;
  border-radius: 20px;
  border: 1.5px solid var(--border);
  transition: border-color 0.2s, background 0.2s;
}

.theme-selector label:hover,
.reminder-option label:hover,
.reminder-times label:hover {
  border-color: var(--accent);
  background: rgba(232,93,42,0.04);
}

.theme-selector input[type="radio"],
.reminder-option input[type="radio"],
.reminder-times input[type="checkbox"] {
  accent-color: var(--accent);
}

.reminder-option {
  margin-bottom: 12px;
}

.reminder-times {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.reminder-times label {
  display: inline-flex;
  margin-right: 8px;
}

/* ── Success message ── */
.success-message {
  text-align: center;
  margin: 32px 0 0;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-2);
}

.success-message p::before {
  content: '🎉 ';
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .container { padding: 20px 16px 40px; }
  .header h1 { font-size: 1.5rem; }
  .button-group { flex-direction: column; gap: 8px; }
  .btn { flex: none; }
  .theme-selector label,
  .reminder-option label { display: inline-flex; margin-bottom: 8px; }
  .countdown-text { font-size: 1.25rem; padding: 14px 16px; }
}

@media (max-width: 480px) {
  .container { padding: 16px 12px 32px; }
  .header h1 { font-size: 1.35rem; }
  .header h1::before { font-size: 1.2rem; }
  .form-group input, .btn { font-size: 0.875rem; }
  .countdown-text { font-size: 1.1rem; padding: 12px; }
  .event-setup, .theme-selector, .button-section, .reminder-settings { padding: 16px; }
}

/* ── 補強：hidden、狀態訊息、完成樣式、focus、觸控目標 ── */
[hidden] { display: none !important; }

.theme-selector h3, .reminder-settings h3 { color: var(--text); }

.countdown-text .done { color: #FF6B6B; font-weight: 700; }

.form-message.inline { margin: -4px 0 14px; }

.form-message {
  margin-bottom: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--accent);
  background: rgba(232,93,42,0.08);
  color: var(--text);
  font-size: 0.875rem;
  font-weight: 600;
}

.btn { min-height: 46px; }

.btn:focus-visible,
.theme-selector label:focus-within,
.reminder-option label:focus-within,
.reminder-times label:focus-within,
.form-group input:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.theme-selector label,
.reminder-option label,
.reminder-times label { min-height: 44px; }

.theme-selector input[type="radio"],
.reminder-option input[type="radio"],
.reminder-times input[type="checkbox"] { width: 18px; height: 18px; }

.form-group label { text-transform: none; }

.button-section .button-group + .button-group { margin-top: 10px; }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}