:root {
  --ocean-900: #06263a;
  --ocean-700: #0b4f6c;
  --ocean-500: #0e7c9e;
  --teal: #17b3a3;
  --sun: #ff8c42;
  --sun-soft: #ffb347;
  --sand: #fff6ec;
  --ink: #17303d;
  --muted: #5c7481;
  --line: #e3edf1;
  --card: #ffffff;
  --bg: #f4fafc;
  --radius: 18px;
  --shadow: 0 10px 30px rgba(11, 79, 108, 0.10);
  --shadow-lg: 0 20px 50px rgba(6, 38, 58, 0.18);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 1000px; margin: 0 auto; padding: 0 20px; }

.section-title {
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  text-align: center;
  color: var(--ocean-900);
  margin-bottom: 6px;
  letter-spacing: 1px;
}
.section-title::after {
  content: "";
  display: block;
  width: 56px; height: 4px;
  margin: 12px auto 0;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--teal), var(--sun));
}
.section-desc {
  text-align: center;
  color: var(--muted);
  margin-bottom: 34px;
  font-size: 0.95rem;
}

/* ---------- 导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(255, 255, 255, 0.72);
  border-bottom: 1px solid transparent;
  transition: all .3s ease;
}
.nav--scrolled {
  background: rgba(255, 255, 255, 0.92);
  border-bottom-color: var(--line);
  box-shadow: 0 4px 20px rgba(11,79,108,.06);
}
.nav__inner {
  max-width: 1000px; margin: 0 auto;
  padding: 12px 20px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav__brand { display: flex; align-items: center; gap: 8px; text-decoration: none; }
.nav__logo { font-size: 1.4rem; }
.nav__title { font-weight: 700; color: var(--ocean-900); font-size: 1.05rem; }
.nav__links { display: flex; gap: 22px; }
.nav__links a {
  text-decoration: none; color: var(--muted);
  font-size: .92rem; font-weight: 500; transition: color .2s;
}
.nav__links a:hover { color: var(--teal); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 78vh;
  display: flex; align-items: center; justify-content: center;
  text-align: center;
  overflow: hidden;
  color: #fff;
}
.hero__bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(circle at 20% 20%, rgba(23,179,163,.55), transparent 45%),
    radial-gradient(circle at 82% 30%, rgba(255,140,66,.5), transparent 42%),
    linear-gradient(160deg, #062a3e 0%, #0b4f6c 45%, #0e7c9e 75%, #17b3a3 100%);
  z-index: -2;
}
.hero__bg::after {
  content: "";
  position: absolute; inset: 0;
  background-image:
    radial-gradient(rgba(255,255,255,.14) 1px, transparent 1px);
  background-size: 26px 26px;
  opacity: .5;
}
.hero__content { position: relative; padding: 40px 20px; max-width: 820px; }
.hero__eyebrow {
  display: inline-block;
  padding: 6px 16px; border-radius: 100px;
  background: rgba(255,255,255,.16);
  border: 1px solid rgba(255,255,255,.28);
  font-size: .82rem; letter-spacing: 2px; margin-bottom: 22px;
}
.hero__title {
  font-size: clamp(2.2rem, 7vw, 4rem);
  line-height: 1.15; font-weight: 800; letter-spacing: 2px;
  text-shadow: 0 6px 30px rgba(0,0,0,.25);
}
.hero__title span { color: var(--sun-soft); }
.hero__subtitle {
  margin-top: 18px; font-size: clamp(1rem, 2.6vw, 1.25rem);
  color: rgba(255,255,255,.9);
}
.hero__route {
  margin: 28px auto 0; display: flex; flex-wrap: wrap;
  gap: 8px; align-items: center; justify-content: center;
  font-size: .95rem;
}
.hero__route span {
  padding: 6px 14px; border-radius: 100px;
  background: rgba(255,255,255,.14);
  border: 1px solid rgba(255,255,255,.22);
  font-weight: 600;
}
.hero__route i { color: var(--sun-soft); font-style: normal; }
.hero__cta {
  display: inline-block; margin-top: 34px;
  padding: 14px 34px; border-radius: 100px;
  background: linear-gradient(90deg, var(--sun), var(--sun-soft));
  color: #3a1e00; font-weight: 700; text-decoration: none;
  box-shadow: 0 10px 30px rgba(255,140,66,.4);
  transition: transform .2s, box-shadow .2s;
}
.hero__cta:hover { transform: translateY(-3px); box-shadow: 0 16px 40px rgba(255,140,66,.5); }

/* ---------- 概览 ---------- */
.overview { padding: 70px 0 40px; }
.stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 16px; margin: 30px 0 50px;
}
.stat {
  background: var(--card); border-radius: var(--radius);
  padding: 26px 16px; text-align: center; box-shadow: var(--shadow);
  border: 1px solid var(--line);
}
.stat__num {
  font-size: clamp(1.6rem, 4vw, 2.2rem); font-weight: 800;
  background: linear-gradient(90deg, var(--ocean-500), var(--teal));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat__label { color: var(--muted); font-size: .88rem; margin-top: 4px; }

.route-map {
  display: flex; flex-wrap: wrap; align-items: flex-start; justify-content: center;
  gap: 6px; background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 30px 20px; box-shadow: var(--shadow);
}
.stop { text-align: center; min-width: 88px; }
.stop__dot {
  width: 42px; height: 42px; margin: 0 auto 8px;
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--ocean-500), var(--teal));
  color: #fff; font-weight: 700; box-shadow: 0 6px 16px rgba(14,124,158,.3);
}
.stop__city { font-weight: 700; color: var(--ocean-900); font-size: .95rem; }
.stop__tag { color: var(--muted); font-size: .78rem; margin-top: 2px; }
.stop__line {
  flex: 0 0 40px; height: 3px; margin-top: 20px;
  background: repeating-linear-gradient(90deg, var(--teal) 0 6px, transparent 6px 12px);
  border-radius: 3px;
}

/* ---------- 日期选择标签条 ---------- */
.daytabs {
  display: flex; gap: 8px; margin-bottom: 30px;
  overflow-x: auto; padding: 6px 2px 14px;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}
.daytabs::-webkit-scrollbar { height: 6px; }
.daytabs::-webkit-scrollbar-thumb { background: #cfe6ec; border-radius: 6px; }
.daytab {
  flex: 0 0 auto; cursor: pointer; font-family: inherit;
  min-width: 74px; padding: 10px 14px;
  display: flex; flex-direction: column; align-items: center; gap: 3px;
  border-radius: 14px; border: 1px solid var(--line);
  background: var(--card); color: var(--muted);
  box-shadow: 0 3px 10px rgba(11,79,108,.05);
  transition: all .2s ease;
}
.daytab:hover { border-color: #cfe6ec; transform: translateY(-2px); color: var(--ocean-700); }
.daytab__date { font-size: .98rem; font-weight: 700; line-height: 1.1; }
.daytab__week { font-size: .76rem; opacity: .8; }
.daytab--active {
  color: #fff; border-color: transparent;
  background: linear-gradient(135deg, var(--ocean-500), var(--teal));
  box-shadow: 0 8px 20px rgba(14,124,158,.32);
}
.daytab--active .daytab__week { opacity: .95; }

/* 选中单天时自动展开详情 */
.card.is-filtered .card__content { max-height: 3200px; }
.card.is-filtered .card__toggle { transform: rotate(180deg); }

/* 单日聚焦：只显示当天行程，隐藏概览/贴士等其他区块 */
body.single-day #overview,
body.single-day #tips { display: none; }
body.single-day .timeline-section .section-desc { display: none; }
#timeline { scroll-margin-top: 72px; }

/* ---------- 时间线 ---------- */
.timeline-section { padding: 50px 0 70px; }
.timeline { position: relative; }
.card {
  display: flex; gap: 18px; margin-bottom: 20px; position: relative;
}
.card[hidden] { display: none; }
.card__marker { flex: 0 0 auto; display: flex; flex-direction: column; align-items: center; }
.card__daynum {
  width: 52px; height: 52px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 1.05rem; color: #fff;
  background: linear-gradient(135deg, var(--ocean-700), var(--teal));
  box-shadow: 0 8px 20px rgba(11,79,108,.28);
  z-index: 1;
}
.card__marker::after {
  content: ""; flex: 1; width: 3px; margin-top: 6px;
  background: linear-gradient(var(--teal), var(--line));
  border-radius: 3px;
}
.card:last-child .card__marker::after { display: none; }

.card__body {
  flex: 1; background: var(--card); border-radius: var(--radius);
  border: 1px solid var(--line); box-shadow: var(--shadow);
  overflow: hidden; transition: box-shadow .3s, transform .3s;
}
.card__body:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); }

.card__head {
  width: 100%; display: flex; align-items: flex-start; justify-content: space-between;
  gap: 16px; padding: 22px 24px; background: none; border: none;
  cursor: pointer; text-align: left; font-family: inherit; color: inherit;
}
.card__date { color: var(--muted); font-size: .88rem; font-weight: 600; }
.card__week {
  display: inline-block; margin-left: 6px; padding: 1px 9px;
  background: var(--sand); color: var(--sun); border-radius: 100px; font-size: .78rem;
}
.card__node { font-size: 1.25rem; color: var(--ocean-900); margin: 6px 0 12px; font-weight: 700; }
.card__tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  font-size: .8rem; padding: 4px 12px; border-radius: 100px; font-weight: 600;
  border: 1px solid transparent;
}
.tag--theme { background: linear-gradient(90deg, var(--teal), var(--ocean-500)); color: #fff; }
.tag--transport { background: #eef7fa; color: var(--ocean-700); border-color: #d7ebf1; }
.tag--stay { background: #fff2e6; color: #c9622a; border-color: #ffe0c7; }

.card__toggle {
  font-size: 1.3rem; color: var(--teal); transition: transform .3s;
  flex: 0 0 auto; line-height: 1;
}
.card.is-open .card__toggle { transform: rotate(180deg); }

.card__content {
  max-height: 0; overflow: hidden;
  transition: max-height .45s ease;
}
.card.is-open .card__content { max-height: 3200px; }
.card__block { padding: 0 24px 20px; }
.card__block-title {
  font-weight: 700; color: var(--ocean-700); font-size: .95rem;
  margin-bottom: 10px; padding-top: 4px;
  border-top: 1px dashed var(--line);
  padding-top: 16px;
}
.card__exp { color: var(--ink); white-space: pre-line; }

.schedule { list-style: none; }
.schedule li {
  display: flex; gap: 14px; padding: 7px 0;
  border-bottom: 1px dashed var(--line); font-size: .92rem;
}
.schedule li:last-child { border-bottom: none; }
.schedule__time {
  flex: 0 0 118px; color: var(--teal); font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.schedule__text { color: var(--ink); }

.food { display: flex; flex-direction: column; gap: 8px; }
.food__row { display: flex; gap: 12px; align-items: baseline; font-size: .92rem; }
.food__meal {
  flex: 0 0 auto; padding: 2px 12px; border-radius: 8px;
  background: var(--sand); color: var(--sun); font-weight: 700; font-size: .82rem;
  min-width: 62px; text-align: center;
}
.food__items { color: var(--muted); }

/* ---------- 贴士 ---------- */
.tips { padding: 40px 0 70px; }
.tips__grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; margin-top: 30px;
}
.tip {
  display: flex; gap: 16px; align-items: flex-start;
  background: var(--card); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow);
}
.tip__icon { font-size: 1.8rem; line-height: 1; }
.tip__title { font-weight: 700; color: var(--ocean-900); margin-bottom: 4px; }
.tip__text { color: var(--muted); font-size: .92rem; }

/* ---------- 页脚 ---------- */
.footer {
  background: linear-gradient(160deg, var(--ocean-900), var(--ocean-700));
  color: rgba(255,255,255,.9); text-align: center; padding: 40px 0;
}
.footer p { font-size: 1rem; }
.footer__meta { margin-top: 8px; font-size: .82rem; color: rgba(255,255,255,.55); }

/* ---------- 响应式 ---------- */
@media (max-width: 720px) {
  .stats { grid-template-columns: repeat(2, 1fr); }
  .tips__grid { grid-template-columns: 1fr; }
  .nav__links { gap: 14px; }
  .nav__title { display: none; }
  .card { gap: 12px; }
  .card__daynum { width: 44px; height: 44px; font-size: .92rem; }
  .card__head { padding: 18px; }
  .card__block { padding: 0 18px 18px; }
  .schedule li { flex-direction: column; gap: 2px; }
  .schedule__time { flex: none; }
  .food__row { flex-direction: column; gap: 4px; }
  .stop__line { flex-basis: 20px; }
}