/* ==========================================================================
   首爾慢活四天三夜 — 設計系統
   色彩靈感:韓國宮殿丹青紅、秋日銀杏黃、青瓷綠、墨藍夜色
   ========================================================================== */

:root {
  --color-bg: #faf5ec;
  --color-bg-soft: #f3ead8;
  --color-surface: #ffffff;
  --color-ink: #2a2440;
  --color-ink-soft: #5c5470;
  --color-persimmon: #c4562f;
  --color-persimmon-dark: #a3441f;
  --color-gold: #d9a441;
  --color-celadon: #6f9c85;
  --color-navy: #232946;
  --color-border: #e8dcc4;
  --color-optional: #9c94a8;

  --font-display: "Noto Serif TC", "Gowun Batang", serif;
  --font-body: "Noto Sans TC", -apple-system, BlinkMacSystemFont, sans-serif;

  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 10px;
  --shadow-soft: 0 8px 24px rgba(42, 36, 64, 0.08);
  --shadow-lift: 0 16px 40px rgba(42, 36, 64, 0.14);

  --header-h: 64px;
  padding-top: env(safe-area-inset-top, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #1b1830;
    --color-bg-soft: #221e3a;
    --color-surface: #262143;
    --color-ink: #f3ecff;
    --color-ink-soft: #c2b8dd;
    --color-border: #38315a;
    --color-optional: #85809c;
  }
}

:root[data-theme="dark"] {
  --color-bg: #1b1830;
  --color-bg-soft: #221e3a;
  --color-surface: #262143;
  --color-ink: #f3ecff;
  --color-ink-soft: #c2b8dd;
  --color-border: #38315a;
  --color-optional: #85809c;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; }
[hidden] { display: none !important; }

a { color: inherit; }

:focus-visible {
  outline: 2px solid var(--color-persimmon);
  outline-offset: 2px;
  border-radius: 4px;
}

.wrap {
  max-width: 1040px;
  margin: 0 auto;
  padding-inline: clamp(16px, 5vw, 32px);
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.35;
  margin: 0;
}

p { margin: 0 0 0.9em; }
p:last-child { margin-bottom: 0; }

/* ---------- Site header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--color-bg) 92%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.site-header__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
  color: var(--color-ink);
}

.brand__mark {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-persimmon), var(--color-gold));
  display: grid;
  place-items: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-size: 1rem;
  cursor: pointer;
  color: var(--color-ink);
}

.day-nav {
  overflow-x: auto;
  scrollbar-width: none;
  padding-block: 10px;
  border-top: 1px solid var(--color-border);
}
.day-nav::-webkit-scrollbar { display: none; }

.day-nav__list {
  list-style: none;
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 2px;
  width: max-content;
}

.day-nav__link {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  white-space: nowrap;
  padding: 8px 16px;
  border-radius: 999px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  text-decoration: none;
  font-size: 0.88rem;
  color: var(--color-ink-soft);
  transition: all 0.2s ease;
}

.day-nav__link.is-active,
.day-nav__link:hover {
  background: var(--color-persimmon);
  border-color: var(--color-persimmon);
  color: #fff;
}

@media (max-width: 680px) {
  .nav-toggle { display: inline-flex; align-items: center; gap: 6px; }
  .day-nav { display: none; }
  .day-nav.is-open { display: block; }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding-top: clamp(40px, 8vw, 72px);
  overflow: hidden;
}

.hero__svg {
  display: block;
  width: 100%;
  height: auto;
}

.hero__content {
  position: relative;
  text-align: center;
  padding-bottom: 28px;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  color: var(--color-persimmon-dark);
  padding: 6px 16px;
  border-radius: 999px;
  font-size: 0.85rem;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(2rem, 6vw, 3.4rem);
  margin-bottom: 14px;
}
.hero h1 em {
  font-style: normal;
  color: var(--color-persimmon);
}

.hero__subtitle {
  max-width: 620px;
  margin: 0 auto 24px;
  color: var(--color-ink-soft);
  font-size: 1.05rem;
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-bottom: 8px;
}

.pill {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 8px 18px;
  font-size: 0.9rem;
  box-shadow: var(--shadow-soft);
}

.pill strong { color: var(--color-persimmon-dark); }

#countdown { font-weight: 700; }

/* ---------- Sections ---------- */
.section {
  padding-block: clamp(48px, 8vw, 88px);
}

.section--soft { background: var(--color-bg-soft); }

.section__head {
  max-width: 680px;
  margin: 0 auto 40px;
  text-align: center;
}

.section__kicker {
  display: block;
  color: var(--color-persimmon);
  font-weight: 700;
  letter-spacing: 0.06em;
  font-size: 0.82rem;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.section__head h2 {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  margin-bottom: 12px;
}

.section__head p {
  color: var(--color-ink-soft);
}

/* ---------- Overview grid ---------- */
.overview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 16px;
}

.overview-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 20px;
  text-decoration: none;
  color: var(--color-ink);
  display: block;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.overview-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lift);
}

.overview-card__icon {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 1.4rem;
  margin-bottom: 14px;
  background: var(--color-bg-soft);
}

.overview-card__date {
  font-size: 0.78rem;
  color: var(--color-persimmon-dark);
  font-weight: 700;
  letter-spacing: 0.03em;
  margin-bottom: 4px;
}

.overview-card h3 {
  font-size: 1.05rem;
  margin-bottom: 6px;
}

.overview-card p {
  font-size: 0.88rem;
  color: var(--color-ink-soft);
}

/* ---------- Day sections ---------- */
.day-section__photo {
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 28px;
  box-shadow: var(--shadow-soft);
  background: var(--color-bg-soft);
}

.day-section__photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.day-section__header {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.day-section__badge {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 1.8rem;
  flex-shrink: 0;
  box-shadow: var(--shadow-soft);
}

.day-section__date {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-persimmon-dark);
  letter-spacing: 0.03em;
  margin-bottom: 4px;
}

.day-section__header h2 {
  font-size: clamp(1.4rem, 3.5vw, 1.9rem);
}

.day-section__intro {
  max-width: 680px;
  color: var(--color-ink-soft);
  margin-bottom: 32px;
  font-size: 0.98rem;
}

/* ---------- Timeline ---------- */
.timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 27px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(var(--color-border), transparent);
}

@media (max-width: 640px) {
  .timeline::before { left: 21px; }
}

.timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 16px;
  align-items: start;
}

@media (max-width: 640px) {
  .timeline-item { grid-template-columns: 44px 1fr; }
}

.timeline-item__icon {
  position: relative;
  z-index: 1;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  display: grid;
  place-items: center;
  font-size: 1.4rem;
  box-shadow: var(--shadow-soft);
}

@media (max-width: 640px) {
  .timeline-item__icon { width: 44px; height: 44px; font-size: 1.15rem; }
}

.timeline-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
}

.timeline-card__top {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.timeline-card__time {
  font-weight: 700;
  color: var(--color-persimmon-dark);
  font-size: 0.85rem;
  background: var(--color-bg-soft);
  padding: 3px 10px;
  border-radius: 999px;
}

.timeline-card h4 {
  font-size: 1.08rem;
  margin: 0;
}

.timeline-card p {
  color: var(--color-ink-soft);
  font-size: 0.94rem;
}

.tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin: 4px 0 8px;
}

.tag {
  font-size: 0.74rem;
  padding: 2px 10px;
  border-radius: 999px;
  font-weight: 700;
  white-space: nowrap;
}

.tag--optional { background: #efeaf5; color: var(--color-optional); }
.tag--food { background: #fbe4d6; color: var(--color-persimmon-dark); }
.tag--view { background: #f6e6c2; color: #8a6412; }
.tag--chill { background: #e3ede6; color: var(--color-celadon); }
.tag--shop { background: #e4e2f5; color: #5b52a3; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .tag--optional { background: #372f52; }
  :root:not([data-theme="light"]) .tag--food { background: #4a2f26; color: #f2b18d; }
  :root:not([data-theme="light"]) .tag--view { background: #443715; color: #f0cd7c; }
  :root:not([data-theme="light"]) .tag--chill { background: #263a2f; color: #a9d6b8; }
  :root:not([data-theme="light"]) .tag--shop { background: #2e2a4d; color: #beb7ec; }
}
:root[data-theme="dark"] .tag--optional { background: #372f52; }
:root[data-theme="dark"] .tag--food { background: #4a2f26; color: #f2b18d; }
:root[data-theme="dark"] .tag--view { background: #443715; color: #f0cd7c; }
:root[data-theme="dark"] .tag--chill { background: #263a2f; color: #a9d6b8; }
:root[data-theme="dark"] .tag--shop { background: #2e2a4d; color: #beb7ec; }

.map-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 8px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-navy);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
}
.map-link:hover { color: var(--color-persimmon); }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .map-link { color: #b9c3ff; }
}
:root[data-theme="dark"] .map-link { color: #b9c3ff; }

/* ---------- Food grid ---------- */
.food-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}

.food-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.food-card__photo {
  width: 100%;
  aspect-ratio: 4 / 3;
  background: var(--color-bg-soft);
}

.food-card__photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.food-card__body {
  padding: 18px 22px 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
}

.food-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lift);
}

.food-card .map-link { margin-top: auto; padding-top: 4px; }

.food-card__icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  display: grid;
  place-items: center;
  font-size: 1.5rem;
  background: var(--color-bg-soft);
}

.food-card h3 { font-size: 1.05rem; }
.food-card p { color: var(--color-ink-soft); font-size: 0.92rem; }

/* ---------- Callout (Busan Q&A) ---------- */
.callout {
  background: var(--color-navy);
  color: #f3ecff;
  border-radius: var(--radius-lg);
  padding: clamp(28px, 5vw, 48px);
  display: grid;
  gap: 24px;
}

.callout h2 { color: #fff; font-size: clamp(1.4rem, 3.5vw, 1.9rem); }
.callout .section__kicker { color: var(--color-gold); }

.callout-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.callout-fact {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: var(--radius-md);
  padding: 18px 20px;
}

.callout-fact__num {
  font-family: var(--font-display);
  font-size: 1.7rem;
  color: var(--color-gold);
  display: block;
  margin-bottom: 4px;
}

.callout-fact p { color: #d8d2ee; font-size: 0.92rem; }

.callout-verdict {
  background: rgba(196, 86, 47, 0.25);
  border: 1px solid rgba(196, 86, 47, 0.5);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  font-size: 0.96rem;
}
.callout-verdict strong { color: #ffd8b0; }

/* ---------- Prep section ---------- */
.prep-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
  margin-bottom: 32px;
}

.prep-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 22px;
}

.prep-card h3 {
  font-size: 1.02rem;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.prep-card ul {
  margin: 0;
  padding-left: 1.1em;
  color: var(--color-ink-soft);
  font-size: 0.92rem;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

/* ---------- Packing checklist ---------- */
.checklist-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 22px clamp(20px, 4vw, 28px);
  margin-bottom: 32px;
}

.checklist-card__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 6px;
}

.checklist-card__head h3 {
  font-size: 1.05rem;
  font-family: var(--font-display);
}

.checklist-card__count {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--color-persimmon-dark);
  white-space: nowrap;
}

.checklist-card__note {
  color: var(--color-ink-soft);
  font-size: 0.86rem;
  margin-bottom: 16px;
}

.checklist-progress {
  height: 8px;
  border-radius: 999px;
  background: var(--color-bg-soft);
  overflow: hidden;
  margin-bottom: 20px;
}

.checklist-progress__bar {
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--color-persimmon), var(--color-gold));
  width: 0%;
  transition: width 0.3s ease;
}

.checklist-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 8px 20px;
}

.checklist-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 4px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.checklist-item input[type="checkbox"] {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  accent-color: var(--color-persimmon);
  cursor: pointer;
}

.checklist-item span {
  font-size: 0.94rem;
  color: var(--color-ink);
}

.checklist-item:has(input:checked) span {
  color: var(--color-ink-soft);
  text-decoration: line-through;
  text-decoration-color: var(--color-optional);
}

.checklist-reset {
  margin-top: 18px;
  background: none;
  border: none;
  padding: 6px 0;
  font-size: 0.82rem;
  color: var(--color-ink-soft);
  text-decoration: underline;
  cursor: pointer;
}
.checklist-reset:hover { color: var(--color-persimmon-dark); }

.budget-table-wrap {
  overflow-x: auto;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

table.budget {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  min-width: 480px;
}

table.budget th, table.budget td {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-border);
}

table.budget th {
  color: var(--color-persimmon-dark);
  font-weight: 700;
  background: var(--color-bg-soft);
}

table.budget tr:last-child td { border-bottom: none; }
.budget-note {
  font-size: 0.82rem;
  color: var(--color-ink-soft);
  padding: 12px 16px 16px;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: 32px;
  text-align: center;
  color: var(--color-ink-soft);
  font-size: 0.85rem;
}

.site-footer a { color: var(--color-persimmon-dark); text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }

/* ---------- Flight card ---------- */
.flight-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: clamp(20px, 4vw, 32px);
  box-shadow: var(--shadow-soft);
}

.flight-card__title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  margin-bottom: 20px;
}

.flight-leg {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px 18px;
  align-items: start;
  padding-block: 16px;
}

.flight-leg + .flight-leg {
  border-top: 1px dashed var(--color-border);
}

.flight-leg__badge {
  background: var(--color-celadon);
  color: #fff;
  font-weight: 700;
  font-size: 0.8rem;
  padding: 4px 12px;
  border-radius: 999px;
  white-space: nowrap;
  height: fit-content;
}

.flight-leg__date {
  color: var(--color-ink-soft);
  font-size: 0.88rem;
  margin-bottom: 8px;
}

.flight-leg__route {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.flight-leg__point {
  display: flex;
  flex-direction: column;
}

.flight-leg__time {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.4rem;
}

.flight-leg__airport {
  font-size: 0.86rem;
  color: var(--color-ink-soft);
}

.flight-leg__arrow {
  color: var(--color-persimmon);
  font-size: 1.1rem;
  flex: 1;
  min-width: 40px;
  text-align: center;
}

.flight-leg__meta {
  margin-top: 8px;
  font-size: 0.82rem;
  color: var(--color-ink-soft);
}

.alert-box {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  background: #fbe4d6;
  border: 1px solid #ecb28b;
  border-radius: var(--radius-md);
  padding: 16px 18px;
  font-size: 0.92rem;
  margin-top: 18px;
}
.alert-box__icon { font-size: 1.3rem; flex-shrink: 0; }
.alert-box strong { color: var(--color-persimmon-dark); }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .alert-box { background: #4a2f26; border-color: #6b4130; }
}
:root[data-theme="dark"] .alert-box { background: #4a2f26; border-color: #6b4130; }

/* ---------- Reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Back to top ---------- */
.to-top {
  position: fixed;
  right: 20px;
  bottom: calc(20px + env(safe-area-inset-bottom, 0px));
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--color-persimmon);
  color: #fff;
  border: none;
  display: grid;
  place-items: center;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: var(--shadow-lift);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
  z-index: 60;
}
.to-top.is-visible { opacity: 1; pointer-events: auto; }