:root {
  --sea: #0d6e6a;
  --sea-deep: #0a3d3a;
  --foam: #f4f7f5;
  --sand: #d9c4a0;
  --sunset: #e07a3d;
  --ink: #142422;
  --muted: #4d6360;
  --line: rgba(20, 36, 34, 0.12);
  --radius: 1.25rem;
  --shadow: 0 20px 50px rgba(10, 61, 58, 0.18);
  /* 系统字体栈，避免依赖 Google Fonts（国内不可用） */
  --font-display: "Songti SC", "STSong", "Noto Serif SC", "Source Han Serif SC", Georgia, "Times New Roman", serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(13, 110, 106, 0.12), transparent 60%),
    radial-gradient(900px 500px at 100% 20%, rgba(224, 122, 61, 0.1), transparent 55%),
    linear-gradient(180deg, #eef5f3 0%, var(--foam) 35%, #e8f0ee 100%);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

.wrap {
  width: min(1120px, calc(100% - 2.5rem));
  margin-inline: auto;
}

/* Topbar */
.topbar {
  position: fixed;
  inset: 0 0 auto;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1.5rem;
  transition: background 0.35s ease, backdrop-filter 0.35s ease, box-shadow 0.35s ease;
}

.topbar.is-solid {
  background: rgba(244, 247, 245, 0.86);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 var(--line);
}

.brand-mini {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.top-nav {
  display: flex;
  gap: 1.25rem;
  font-size: 0.92rem;
  font-weight: 500;
}

.top-nav a {
  opacity: 0.75;
  transition: opacity 0.2s;
}

.top-nav a:hover {
  opacity: 1;
}

/* Hero */
.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: center;
  color: #fff;
  overflow: hidden;
}

.hero-media {
  position: absolute;
  inset: 0;
}

.hero-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.06);
  animation: heroDrift 18s ease-in-out infinite alternate;
}

@keyframes heroDrift {
  from { transform: scale(1.06) translate3d(0, 0, 0); }
  to { transform: scale(1.12) translate3d(-1.5%, -1%, 0); }
}

.hero-veil {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(10, 40, 38, 0.35) 0%, rgba(10, 40, 38, 0.42) 45%, rgba(8, 28, 26, 0.78) 100%),
    linear-gradient(90deg, rgba(8, 28, 26, 0.55), transparent 60%);
}

.hero-copy {
  position: relative;
  z-index: 2;
  width: min(1120px, calc(100% - 2.5rem));
  margin: 4rem auto 0;
  padding-bottom: 3rem;
  animation: riseIn 1s ease both;
}

@keyframes riseIn {
  from { opacity: 0; transform: translateY(28px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero-kicker {
  margin: 0 0 0.75rem;
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  opacity: 0.85;
  font-weight: 500;
}

.hero-brand {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(4.5rem, 14vw, 9rem);
  line-height: 0.92;
  font-weight: 700;
  letter-spacing: -0.03em;
  text-shadow: 0 10px 40px rgba(0, 0, 0, 0.25);
}

.hero-lead {
  margin: 1rem 0 1.75rem;
  max-width: 22em;
  font-size: clamp(1.1rem, 2.4vw, 1.4rem);
  font-weight: 300;
  opacity: 0.95;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.35rem;
  border-radius: 999px;
  font-weight: 560;
  font-size: 0.95rem;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: var(--sunset);
  color: #fff;
}

.btn-ghost {
  border: 1px solid rgba(255, 255, 255, 0.45);
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.hero-scroll {
  position: absolute;
  left: 50%;
  bottom: 1.4rem;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  opacity: 0.8;
}

.hero-scroll i {
  width: 1px;
  height: 2rem;
  background: linear-gradient(transparent, #fff);
  animation: scrollPulse 1.6s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { opacity: 0.25; transform: scaleY(0.7); }
  50% { opacity: 1; transform: scaleY(1); }
}

/* Overview */
.overview {
  padding: 4.5rem 0 2rem;
}

.overview-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.stat {
  padding: 1.4rem 1.2rem;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid var(--line);
  text-align: center;
}

.stat-num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.8rem);
  color: var(--sea);
  line-height: 1;
}

.stat-label {
  display: block;
  margin-top: 0.45rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.overview-text {
  max-width: 46rem;
  margin: 0 auto;
  text-align: center;
  color: var(--muted);
  font-size: 1.05rem;
}

.overview-text strong {
  color: var(--sea-deep);
  font-weight: 600;
}

/* Day rail */
.day-rail {
  position: sticky;
  top: 3.4rem;
  z-index: 30;
  padding: 0.65rem 0;
  background: rgba(244, 247, 245, 0.9);
  backdrop-filter: blur(10px);
  border-block: 1px solid var(--line);
}

.day-rail-track {
  width: min(1120px, calc(100% - 1rem));
  margin-inline: auto;
  display: flex;
  gap: 0.45rem;
  overflow-x: auto;
  scrollbar-width: none;
  padding-inline: 0.5rem;
}

.day-rail-track::-webkit-scrollbar {
  display: none;
}

.day-rail a {
  flex: 0 0 auto;
  padding: 0.55rem 0.9rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--muted);
  border: 1px solid transparent;
  transition: all 0.2s ease;
}

.day-rail a:hover,
.day-rail a.is-active {
  color: var(--sea-deep);
  background: rgba(13, 110, 106, 0.1);
  border-color: rgba(13, 110, 106, 0.2);
}

/* Itinerary */
.itinerary {
  padding: 3rem 0 1rem;
}

.section-head {
  text-align: center;
  margin-bottom: 2.5rem;
}

.eyebrow {
  margin: 0 0 0.4rem;
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--sunset);
  font-weight: 600;
}

.section-head h2,
.pack-copy h2,
.tips .section-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.02em;
}

.section-desc {
  margin: 0.75rem auto 0;
  max-width: 28rem;
  color: var(--muted);
}

.day {
  padding: 2.5rem 0;
}

.day-inner {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2.5rem;
  align-items: center;
}

.day-alt .day-inner {
  grid-template-columns: 0.95fr 1.05fr;
}

.day-alt .day-visual {
  order: 2;
}

.day-alt .day-body {
  order: 1;
}

.day-visual {
  position: relative;
  border-radius: calc(var(--radius) + 0.35rem);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.day-visual img,
.side-shot img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  transition: transform 0.8s ease;
}

.day-visual:hover img,
.side-shot:hover img {
  transform: scale(1.04);
}

.day-tag {
  position: absolute;
  left: 1rem;
  bottom: 1rem;
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  background: rgba(20, 36, 34, 0.72);
  color: #fff;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  backdrop-filter: blur(6px);
}

.day-body h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  letter-spacing: -0.02em;
}

.day-sub {
  margin: 0.5rem 0 1.25rem;
  color: var(--muted);
}

.timeline {
  margin: 0;
  padding: 0;
  list-style: none;
}

.timeline li {
  position: relative;
  padding: 0.7rem 0 0.7rem 1.1rem;
  border-left: 2px solid rgba(13, 110, 106, 0.25);
}

.timeline li::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 1.15rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--sea);
}

.timeline em {
  display: inline-block;
  min-width: 4.5em;
  margin-right: 0.35rem;
  font-style: normal;
  font-weight: 600;
  color: var(--sea);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.35rem;
}

.chips span {
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  background: rgba(13, 110, 106, 0.1);
  color: var(--sea-deep);
  font-size: 0.82rem;
  font-weight: 500;
}

.alt-note {
  margin: 1rem 0 0;
  padding: 0.85rem 1rem;
  border-radius: 0.85rem;
  background: rgba(224, 122, 61, 0.1);
  color: #8a4a22;
  font-size: 0.95rem;
}

.day-extra {
  margin-top: 1.5rem;
}

.side-shot {
  margin: 0;
  max-width: 420px;
  margin-left: auto;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  background: #fff;
}

.side-shot figcaption {
  padding: 0.75rem 1rem;
  font-size: 0.88rem;
  color: var(--muted);
}

/* Tips */
.tips {
  padding: 4rem 0;
}

.tips-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.tip {
  padding: 1.4rem 1.3rem;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid var(--line);
}

.tip h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.2rem;
}

.tip p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

/* Pack */
.pack {
  padding: 1rem 0 5rem;
}

.pack-layout {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 2rem;
  align-items: start;
}

.checklist {
  margin: 1.5rem 0 0;
  padding: 0;
  list-style: none;
}

.checklist li {
  position: relative;
  padding: 0.7rem 0 0.7rem 1.8rem;
  border-bottom: 1px solid var(--line);
}

.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1rem;
  width: 0.95rem;
  height: 0.95rem;
  border-radius: 0.25rem;
  border: 2px solid var(--sea);
  background:
    linear-gradient(var(--sea), var(--sea)) center / 0.45rem 0.45rem no-repeat;
}

.pack-card {
  padding: 1.75rem;
  border-radius: calc(var(--radius) + 0.2rem);
  background:
    linear-gradient(160deg, rgba(13, 110, 106, 0.95), rgba(10, 61, 58, 0.98)),
    var(--sea-deep);
  color: #fff;
  box-shadow: var(--shadow);
}

.pack-card h3 {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-size: 1.5rem;
}

.pack-card ol {
  margin: 0;
  padding-left: 1.2rem;
  display: grid;
  gap: 0.65rem;
}

.pack-foot {
  margin: 1.4rem 0 0;
  opacity: 0.8;
  font-size: 0.92rem;
}

/* Footer */
.footer {
  padding: 2rem 0 2.5rem;
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.45);
}

.footer-inner {
  text-align: center;
  color: var(--muted);
  font-size: 0.92rem;
}

.footer-brand {
  margin: 0 0 0.25rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  color: var(--ink);
}

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.is-in {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive */
@media (max-width: 900px) {
  .overview-grid,
  .tips-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .day-inner,
  .day-alt .day-inner,
  .pack-layout {
    grid-template-columns: 1fr;
  }

  .day-alt .day-visual,
  .day-alt .day-body {
    order: initial;
  }

  .side-shot {
    margin-left: 0;
    max-width: none;
  }

  .hero-copy {
    margin-bottom: 6.5rem;
  }
}

@media (max-width: 560px) {
  .overview-grid {
    grid-template-columns: 1fr 1fr;
  }

  .tips-grid {
    grid-template-columns: 1fr;
  }

  .top-nav {
    gap: 0.85rem;
    font-size: 0.85rem;
  }

  .hero-brand {
    font-size: clamp(3.6rem, 18vw, 5rem);
  }
}