/* ═══ Variables ══════════════════════════════════════════════════════════ */
:root {
  --cream: #fdf8f2;
  --warm-white: #fff9f4;
  --brown-light: #f5ede0;
  --brown-mid: #d4a96a;
  --brown-dark: #b5651d;
  --brown-deep: #7c4a1e;
  --text-main: #2c1a0e;
  --text-muted: #7a5c3e;
  --text-hint: #a08060;
  --red-err: #c0392b;
  --green-ok: #27ae60;
  --shadow-card: 0 4px 24px rgba(140, 90, 40, 0.10);
  --shadow-hover: 0 8px 32px rgba(140, 90, 40, 0.18);
  --radius: 14px;
  --radius-sm: 8px;
  --transition: 0.22s ease;
}

/* ═══ Reset & Base ════════════════════════════════════════════════════════ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  background: var(--cream);
  color: var(--text-main);
  font-family: 'Noto Sans TC', sans-serif;
  line-height: 1.7;
  min-height: 100vh;
}
a { color: var(--brown-dark); text-decoration: underline; }
a:hover { color: var(--brown-deep); }
s { color: var(--text-hint); }

/* ═══ Layout ══════════════════════════════════════════════════════════════ */
.container { max-width: 820px; margin: 0 auto; padding: 0 20px; }
.container.narrow { max-width: 640px; }

/* ═══ Hero ════════════════════════════════════════════════════════════════ */
.hero {
  position: relative;
  background: linear-gradient(160deg, #3a1a06 0%, #7c3a0a 40%, #b5651d 80%, #d4a96a 100%);
  color: #fff;
  padding: 72px 24px 80px;
  text-align: center;
  overflow: hidden;
}
.hero-glow {
  position: absolute;
  top: -60px; left: 50%; transform: translateX(-50%);
  width: 600px; height: 300px;
  background: radial-gradient(ellipse, rgba(255,200,100,0.20) 0%, transparent 70%);
  pointer-events: none;
}
.hero-content { position: relative; z-index: 1; }
.hero-label {
  font-size: 0.85rem;
  font-family: 'Noto Serif TC', serif;
  letter-spacing: 0.08em;
  color: rgba(255,255,255,0.75);
  margin-bottom: 12px;
}
.hero-title {
  font-family: 'Noto Serif TC', serif;
  font-size: clamp(2rem, 6vw, 3.2rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.2;
  margin-bottom: 8px;
  text-shadow: 0 2px 8px rgba(0,0,0,0.3);
}
.hero-sub {
  font-size: 1.05rem;
  color: rgba(255,255,255,0.85);
  margin-bottom: 20px;
}
.hero-tagline {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  font-family: 'Noto Serif TC', serif;
  font-size: 1.15rem;
  font-weight: 500;
  color: #ffe8c2;
  margin-bottom: 24px;
}
.hero-tagline .dot { color: rgba(255,255,255,0.4); font-size: 1.5rem; }
.hero-chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 20px;
}
.chip {
  background: rgba(255,255,255,0.15);
  border: 1px solid rgba(255,255,255,0.3);
  border-radius: 999px;
  padding: 6px 16px;
  font-size: 0.9rem;
  backdrop-filter: blur(4px);
}
.hero-notice {
  font-size: 0.95rem;
  color: #ffe0a0;
  margin-bottom: 8px;
}
.hero-limit {
  display: inline-block;
  background: rgba(255,255,255,0.18);
  border: 1px solid rgba(255,255,255,0.35);
  border-radius: 999px;
  padding: 8px 24px;
  font-size: 0.95rem;
  color: #fff;
}
.hero-limit strong { color: #ffe8a0; }

/* ═══ Sections ════════════════════════════════════════════════════════════ */
.section { padding: 60px 0; }
.section-alt { background: var(--brown-light); }
.section-title {
  font-family: 'Noto Serif TC', serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--brown-deep);
  margin-bottom: 8px;
  text-align: center;
}
.section-note {
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 32px;
}

/* ═══ Session Cards (Info) ════════════════════════════════════════════════ */
.sessions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}
.session-card {
  background: var(--warm-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 24px;
  border: 1.5px solid transparent;
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}
.session-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-3px);
  border-color: var(--brown-mid);
}
.session-card-accent {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--brown-mid), var(--brown-dark));
}
.session-date {
  font-size: 0.85rem;
  color: var(--text-hint);
  font-weight: 500;
  margin-bottom: 4px;
}
.session-theme {
  font-family: 'Noto Serif TC', serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--brown-deep);
  margin-bottom: 8px;
}
.session-filling {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.quota-badge {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
}
.quota-badge.available { background: #edf7ee; color: #2c7a40; border: 1px solid #a8dcb0; }
.quota-badge.low { background: #fff5e6; color: #a0560a; border: 1px solid #f4c470; }
.quota-badge.full { background: #fceaea; color: var(--red-err); border: 1px solid #f4a0a0; }
.session-skeleton {
  height: 160px;
  border-radius: var(--radius);
  background: linear-gradient(90deg, #f0e6d8 25%, #f8f0e8 50%, #f0e6d8 75%);
  background-size: 200% 100%;
  animation: shimmer 1.4s infinite;
}
@keyframes shimmer { 0% { background-position: -200% 0; } 100% { background-position: 200% 0; } }

/* ═══ Pricing ═════════════════════════════════════════════════════════════ */
.pricing-original {
  text-align: center;
  font-size: 1rem;
  color: var(--text-hint);
  margin-bottom: 4px;
}
.pricing-label {
  text-align: center;
  color: var(--brown-dark);
  font-weight: 600;
  font-size: 1rem;
  margin-bottom: 24px;
}
.pricing-cards {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.pricing-card {
  flex: 1;
  min-width: 180px;
  max-width: 240px;
  background: var(--warm-white);
  border-radius: var(--radius);
  border: 2px solid var(--brown-mid);
  padding: 24px 20px;
  text-align: center;
  transition: box-shadow var(--transition), transform var(--transition);
  position: relative;
}
.pricing-card.highlight {
  background: linear-gradient(160deg, #fff5e8 0%, #ffecd0 100%);
  border-color: var(--brown-dark);
  box-shadow: 0 4px 20px rgba(180, 100, 30, 0.15);
}
.pricing-card-badge {
  position: absolute;
  top: -14px; left: 50%; transform: translateX(-50%);
  background: var(--brown-dark);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 700;
  padding: 3px 14px;
  border-radius: 999px;
  white-space: nowrap;
}
.pricing-card-label { font-size: 1rem; font-weight: 600; color: var(--text-main); margin-bottom: 8px; }
.pricing-card-price { font-size: 1.6rem; color: var(--brown-deep); margin-bottom: 4px; }
.pricing-card-price strong { font-size: 2rem; font-family: 'Noto Serif TC', serif; }
.pricing-card-desc { font-size: 0.85rem; color: var(--text-muted); }
.pricing-note {
  text-align: center;
  font-size: 0.88rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ═══ Form ════════════════════════════════════════════════════════════════ */
.form-group-set {
  border: none;
  padding: 0;
  margin-bottom: 28px;
}
.form-group-set legend {
  font-family: 'Noto Serif TC', serif;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--brown-deep);
  margin-bottom: 16px;
  width: 100%;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--brown-light);
}
.form-row {
  margin-bottom: 16px;
}
.form-row label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-main);
  margin-bottom: 6px;
}
.label-hint {
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--text-hint);
}
.req { color: var(--brown-dark); }
input[type="text"],
input[type="tel"],
input[type="email"],
select,
textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid #d9c9b4;
  border-radius: var(--radius-sm);
  font-size: 0.97rem;
  font-family: inherit;
  background: var(--warm-white);
  color: var(--text-main);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}
input:focus, select:focus, textarea:focus {
  border-color: var(--brown-mid);
  box-shadow: 0 0 0 3px rgba(212, 169, 106, 0.20);
}
input.invalid, select.invalid, textarea.invalid {
  border-color: var(--red-err);
  box-shadow: 0 0 0 3px rgba(192, 57, 43, 0.10);
}
.field-error {
  font-size: 0.82rem;
  color: var(--red-err);
  margin-top: 4px;
  min-height: 18px;
}
.loading-dot {
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--text-hint);
  animation: pulse 1.2s infinite;
}
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.4; } }

/* ═══ Session Radio Options (in form) ════════════════════════════════════ */
.session-options { display: flex; flex-direction: column; gap: 10px; }
.session-option {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  border: 1.5px solid #d9c9b4;
  background: var(--warm-white);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
  user-select: none;
}
.session-option:hover:not(.disabled) {
  border-color: var(--brown-mid);
  background: #fffaf5;
  box-shadow: 0 2px 8px rgba(140,90,40,0.08);
}
.session-option.selected {
  border-color: var(--brown-dark);
  background: #fff5e8;
  box-shadow: 0 0 0 3px rgba(181, 101, 29, 0.15);
}
.session-option.disabled {
  opacity: 0.55;
  cursor: not-allowed;
  background: #f5f0ea;
}
.session-option input[type="radio"] {
  width: 18px; height: 18px;
  flex-shrink: 0;
  accent-color: var(--brown-dark);
  cursor: inherit;
}
.session-option-info { flex: 1; }
.session-option-date { font-size: 0.82rem; color: var(--text-hint); }
.session-option-theme { font-weight: 600; color: var(--brown-deep); font-size: 0.97rem; }
.session-option-filling { font-size: 0.82rem; color: var(--text-muted); }
.session-option-quota { margin-left: auto; }

/* ═══ Plan Options ════════════════════════════════════════════════════════ */
.plan-options { display: flex; gap: 12px; flex-wrap: wrap; }
.plan-option {
  flex: 1;
  min-width: 160px;
  border: 2px solid #d9c9b4;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
  overflow: hidden;
}
.plan-option:has(input:checked) {
  border-color: var(--brown-dark);
  box-shadow: 0 0 0 3px rgba(181,101,29,0.15);
  background: #fff5e8;
}
.plan-option input { position: absolute; opacity: 0; pointer-events: none; }
.plan-option-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px 12px;
  gap: 4px;
}
.plan-name { font-weight: 700; font-size: 1rem; color: var(--brown-deep); }
.plan-price { font-size: 0.88rem; color: var(--text-muted); }

.companion-hidden { display: none; }
.companion-visible { display: block; animation: fadeIn 0.25s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: none; } }

.child-seat-option {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-top: 14px;
  padding: 14px 16px;
  border: 1px solid #dcccb8;
  border-radius: var(--radius-sm);
  background: #fffaf5;
  color: var(--text-main);
  font-size: 0.9rem;
  line-height: 1.6;
}
.child-seat-option input[type="checkbox"] {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 2px;
  accent-color: var(--brown-dark);
}

/* ═══ Rules ══════════════════════════════════════════════════════════════ */
.rules-box {
  background: var(--brown-light);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 20px;
  max-height: 300px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--brown-mid) transparent;
}
.rules-box p { margin-bottom: 8px; }
.rules-box ul { padding-left: 20px; margin-bottom: 8px; }
.rules-box li { margin-bottom: 4px; }
.rules-divider { border: none; border-top: 1px solid var(--brown-mid); opacity: 0.3; margin: 16px 0; }
.rules-agree {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  cursor: pointer;
  font-size: 0.92rem;
  color: var(--text-main);
  line-height: 1.5;
}
.rules-agree input[type="checkbox"] {
  width: 18px; height: 18px;
  flex-shrink: 0;
  margin-top: 2px;
  accent-color: var(--brown-dark);
}

/* ═══ Price Summary + Submit ══════════════════════════════════════════════ */
.price-summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--brown-light);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  margin-bottom: 20px;
  font-size: 1rem;
  color: var(--text-muted);
}
.price-total {
  font-family: 'Noto Serif TC', serif;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--brown-deep);
}

.btn-submit {
  width: 100%;
  padding: 16px;
  border: none;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--brown-dark), var(--brown-deep));
  color: #fff;
  font-size: 1.08rem;
  font-family: 'Noto Serif TC', serif;
  font-weight: 700;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: opacity var(--transition), transform var(--transition), box-shadow var(--transition);
  box-shadow: 0 4px 16px rgba(122, 74, 30, 0.35);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}
.btn-submit:not(:disabled):hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(122, 74, 30, 0.45);
}
.btn-submit:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}
.spinner {
  width: 20px; height: 20px;
  border: 2px solid rgba(255,255,255,0.35);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ═══ Alerts ══════════════════════════════════════════════════════════════ */
.form-alert {
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  font-size: 0.93rem;
  line-height: 1.6;
}
.form-alert-error {
  background: #fdecea;
  border-left: 4px solid var(--red-err);
  color: #7a1a10;
}
.form-alert-soldout {
  background: #ffecd0;
  border-left: 4px solid var(--brown-dark);
  color: var(--brown-deep);
}

/* ═══ Footer ══════════════════════════════════════════════════════════════ */
.footer {
  text-align: center;
  padding: 40px 20px;
  background: #2c1a0e;
  color: rgba(255,255,255,0.55);
  font-size: 0.88rem;
  line-height: 2;
}
.footer a { color: var(--brown-mid); }

/* ═══ Responsive ══════════════════════════════════════════════════════════ */
@media (max-width: 540px) {
  .hero { padding: 52px 20px 60px; }
  .hero-tagline { flex-direction: column; gap: 4px; }
  .hero-tagline .dot { display: none; }
  .pricing-cards { flex-direction: column; align-items: center; }
  .pricing-card { max-width: 100%; width: 100%; }
  .plan-options { flex-direction: column; }
}