:root {
  --brand: oklch(0.63 0.23 6);
  --brand-deep: oklch(0.47 0.19 7);
  --navy: oklch(0.23 0.075 257);
  --navy-soft: oklch(0.3 0.07 255);
  --ink: oklch(0.2 0.025 255);
  --ink-soft: oklch(0.43 0.025 255);
  --muted: oklch(0.62 0.018 255);
  --line: oklch(0.89 0.012 255);
  --surface: oklch(1 0 0);
  --surface-subtle: oklch(0.975 0.005 255);
  --focus: oklch(0.76 0.16 8);
  --header-height: 88px;
  --content: min(1180px, calc(100vw - 48px));
  --ease-out: cubic-bezier(.16, 1, .3, 1);
  --z-header: 30;
  --z-menu: 40;
  --z-mobile-contact: 50;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 24px);
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--surface);
  font-family: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

body.menu-open { overflow: hidden; }

img { display: block; max-width: 100%; }
a { color: inherit; }
button { font: inherit; }

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 100;
  padding: 10px 14px;
  color: var(--surface);
  background: var(--navy);
  transform: translateY(-160%);
}

.skip-link:focus { transform: translateY(0); }

:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  height: var(--header-height);
  background: color-mix(in oklch, var(--surface) 96%, transparent);
  border-bottom: 1px solid color-mix(in oklch, var(--line) 72%, transparent);
  backdrop-filter: blur(12px);
}

.header-inner {
  width: var(--content);
  height: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: clamp(24px, 4vw, 60px);
}

.brand { flex: 0 0 auto; }
.brand img { width: 210px; height: auto; }

.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: clamp(24px, 3vw, 42px);
}

.site-nav a {
  position: relative;
  color: var(--ink);
  font-size: 15px;
  font-weight: 650;
  text-decoration: none;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: -8px;
  height: 2px;
  background: var(--brand);
  transition: right 220ms var(--ease-out);
}

.site-nav a:hover::after { right: 0; }

.header-call {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 48px;
  padding-left: 22px;
  border-left: 1px solid var(--line);
  text-decoration: none;
  line-height: 1.25;
}

.header-call span { color: var(--muted); font-size: 11px; }
.header-call strong { font-size: 15px; letter-spacing: .02em; }

.menu-toggle {
  display: none;
  margin-left: auto;
  min-width: 48px;
  min-height: 48px;
  padding: 0;
  border: 0;
  color: var(--ink);
  background: transparent;
  cursor: pointer;
}

.menu-toggle-label { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.menu-lines { width: 26px; display: flex; flex-direction: column; gap: 7px; }
.menu-lines i { display: block; width: 100%; height: 2px; background: currentColor; transition: transform 220ms var(--ease-out); }

.hero {
  position: relative;
  min-height: calc(100svh - var(--header-height));
  display: grid;
  grid-template-columns: minmax(0, .85fr) minmax(520px, 1.15fr);
  color: var(--surface);
  background: var(--navy);
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  width: 420px;
  height: 420px;
  left: -260px;
  bottom: -240px;
  border-radius: 50%;
  background: var(--brand);
  filter: blur(1px);
  opacity: .28;
}

.hero-copy {
  position: relative;
  z-index: 2;
  align-self: center;
  width: min(620px, 100%);
  margin-left: max(24px, calc((100vw - 1180px) / 2));
  padding: clamp(72px, 10vh, 120px) clamp(32px, 5vw, 84px) 120px 0;
}

.hero-mark {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 26px;
  color: oklch(0.82 0.03 255);
  font-size: 13px;
  font-weight: 650;
  letter-spacing: .04em;
}

.hero-mark span { width: 34px; height: 2px; background: var(--brand); }

.hero h1 {
  margin: 0;
  font-family: "Songti SC", "Noto Serif SC", STSong, serif;
  font-size: clamp(3rem, 4.55vw, 5.35rem);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -.035em;
  text-wrap: balance;
}

.hero h1 span,
.hero h1 em { display: block; white-space: nowrap; }

.hero h1 em { color: oklch(0.77 0.17 7); font-style: normal; }

.hero-lead {
  max-width: 38rem;
  margin: 28px 0 0;
  color: oklch(0.86 0.02 255);
  font-size: clamp(1rem, 1.25vw, 1.14rem);
  line-height: 1.9;
  text-wrap: pretty;
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 36px; }

.button {
  min-height: 50px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 24px;
  border-radius: 3px;
  font-weight: 700;
  text-decoration: none;
  transition: transform 180ms var(--ease-out), background-color 180ms ease, color 180ms ease;
}

.button:hover { transform: translateY(-2px); }
.button-primary { color: var(--surface); background: var(--brand); }
.button-primary:hover { background: var(--brand-deep); }
.button-quiet { color: var(--surface); border: 1px solid color-mix(in oklch, var(--surface) 42%, transparent); }
.button-quiet:hover { color: var(--navy); background: var(--surface); }

.hero-proof {
  display: flex;
  gap: clamp(24px, 3vw, 44px);
  margin: clamp(48px, 8vh, 82px) 0 0;
  padding: 28px 0 0;
  border-top: 1px solid color-mix(in oklch, var(--surface) 18%, transparent);
  list-style: none;
}

.hero-proof li { display: flex; flex-direction: column; line-height: 1.45; }
.hero-proof strong { color: var(--surface); font-size: 16px; }
.hero-proof span { color: oklch(0.73 0.018 255); font-size: 12px; }

.hero-visual {
  position: relative;
  min-height: 100%;
  overflow: hidden;
}

.hero-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--navy) 0%, transparent 22%, transparent 72%, color-mix(in oklch, var(--navy) 16%, transparent) 100%);
  pointer-events: none;
}

.hero-visual img {
  width: 100%;
  height: 100%;
  min-height: calc(100svh - var(--header-height));
  object-fit: cover;
  object-position: center;
  transform: scale(1.015);
  animation: hero-settle 1.8s var(--ease-out) both;
}

.hero-caption {
  position: absolute;
  right: 28px;
  bottom: 32px;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  color: oklch(0.93 0.01 255);
  font-size: 12px;
  line-height: 1.6;
  text-shadow: 0 1px 6px oklch(0.12 0.04 255 / .7);
}

.hero-caption span:first-child { font-size: 16px; font-weight: 700; }

.hero-scroll {
  position: absolute;
  left: 50%;
  bottom: 30px;
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 10px;
  color: oklch(0.9 0.01 255);
  font-size: 12px;
  text-decoration: none;
  transform: translateX(-50%);
}

.hero-scroll span { color: var(--brand); font-size: 18px; }

@keyframes hero-settle {
  from { transform: scale(1.08); filter: saturate(.75); }
  to { transform: scale(1.015); filter: saturate(1); }
}

.section { width: var(--content); margin: 0 auto; padding: clamp(92px, 11vw, 154px) 0; }

.section-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 48px;
  margin-bottom: clamp(42px, 6vw, 72px);
}

.section-heading > p { max-width: 36rem; margin: 0 0 5px; color: var(--ink-soft); }
.section-intro { margin: 0 0 15px; color: var(--brand-deep); font-size: 14px; font-weight: 750; }

.section-heading h2,
.service-statement h2,
.about-copy h2,
.contact-strip h2 {
  max-width: 18ch;
  margin: 0;
  font-family: "Songti SC", "Noto Serif SC", STSong, serif;
  font-size: clamp(2.2rem, 4vw, 4.4rem);
  line-height: 1.18;
  letter-spacing: -.03em;
  text-wrap: balance;
}

.route-explorer {
  display: grid;
  grid-template-columns: minmax(0, 1.55fr) minmax(340px, .7fr);
  min-height: 620px;
  background: var(--surface-subtle);
}

.route-stage { position: relative; min-height: 620px; overflow: hidden; background: var(--navy); }
.route-stage > img { width: 100%; height: 100%; object-fit: cover; transition: opacity 240ms ease, transform 620ms var(--ease-out); }
.route-stage.is-switching > img { opacity: .5; transform: scale(1.04); }
.route-stage-shade { position: absolute; inset: 0; background: linear-gradient(0deg, oklch(0.12 0.03 255 / .92) 0%, oklch(0.12 0.03 255 / .05) 75%); }

.route-stage-copy {
  position: absolute;
  left: clamp(26px, 5vw, 68px);
  right: clamp(26px, 5vw, 68px);
  bottom: clamp(28px, 5vw, 62px);
  color: var(--surface);
}

.route-stage-copy > p:first-child { margin: 0 0 10px; color: oklch(0.84 0.02 255); font-size: 13px; font-weight: 650; }
.route-stage-copy h3 { margin: 0; font-family: "Songti SC", STSong, serif; font-size: clamp(2.35rem, 4.8vw, 4.7rem); line-height: 1.1; letter-spacing: -.03em; }
.route-stage-copy > p:not(:first-child) { max-width: 42rem; margin: 18px 0 0; color: oklch(0.9 0.012 255); font-size: 15px; }

.route-stage-footer { display: flex; align-items: center; gap: 32px; margin-top: 26px; }
.route-stage-footer > span { color: oklch(0.82 0.15 8); font-size: 18px; font-weight: 750; }
.route-stage-footer a { color: var(--surface); font-size: 14px; font-weight: 700; text-underline-offset: 5px; }

.route-list { display: flex; flex-direction: column; justify-content: stretch; padding: 12px 32px; }
.route-option {
  flex: 1 1 0;
  min-height: 112px;
  display: grid;
  grid-template-columns: 1fr 20px;
  align-items: center;
  gap: 16px;
  width: 100%;
  padding: 24px 0;
  border: 0;
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
  background: transparent;
  text-align: left;
  cursor: pointer;
  transition: color 180ms ease;
}

.route-option:last-child { border-bottom: 0; }
.route-option:hover { color: var(--ink); }
.route-option.is-active { color: var(--brand-deep); }
.route-label { display: flex; flex-direction: column; gap: 5px; transition: transform 220ms var(--ease-out); }
.route-option:hover .route-label { transform: translateX(6px); }
.route-label strong { font-size: 18px; }
.route-label small { color: var(--muted); font-size: 12px; }
.route-arrow { justify-self: end; font-size: 18px; transform: rotate(45deg); transition: transform 220ms var(--ease-out); }
.route-option.is-active .route-arrow { transform: rotate(0); }

.destinations {
  padding: clamp(92px, 11vw, 154px) max(24px, calc((100vw - 1180px) / 2));
  color: var(--surface);
  background: var(--navy);
}

.destination-heading > p { color: oklch(0.78 0.02 255); }
.destination-heading .section-intro { color: oklch(0.8 0.16 8); }
.destination-heading h2 { color: var(--surface); }

.travel-modes { display: grid; grid-template-columns: .85fr 1.15fr 1fr; min-height: 570px; }

.travel-mode {
  position: relative;
  min-height: 570px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: clamp(28px, 3vw, 46px);
  color: var(--surface);
  text-decoration: none;
  overflow: hidden;
  isolation: isolate;
}

.travel-mode + .travel-mode { border-left: 1px solid oklch(1 0 0 / .26); }
.travel-mode::after { content: ""; position: absolute; inset: 0; z-index: -1; background: linear-gradient(0deg, oklch(0.13 0.04 255 / .95) 0%, oklch(0.13 0.04 255 / .08) 76%); }
.travel-mode > img { position: absolute; inset: 0; z-index: -2; width: 100%; height: 100%; object-fit: cover; transition: transform 700ms var(--ease-out), filter 300ms ease; }
.travel-mode:hover > img { transform: scale(1.045); filter: saturate(1.12); }
.mode-train { background: var(--brand); }
.mode-train::before { content: "通达"; position: absolute; top: 18px; right: -4px; z-index: -1; color: oklch(1 0 0 / .13); font-family: "Songti SC", STSong, serif; font-size: clamp(7rem, 12vw, 12rem); font-weight: 800; line-height: 1; writing-mode: vertical-rl; }
.mode-copy > span { color: oklch(0.88 0.04 255); font-size: 13px; font-weight: 700; }
.mode-train .mode-copy > span { color: oklch(1 0 0 / .82); }
.mode-copy h3 { max-width: 11ch; margin: 12px 0 14px; font-family: "Songti SC", STSong, serif; font-size: clamp(1.8rem, 3vw, 3.4rem); line-height: 1.18; text-wrap: balance; }
.mode-copy p { max-width: 28rem; margin: 0; color: oklch(0.88 0.018 255); font-size: 14px; }
.mode-cta { margin-top: 34px; font-size: 13px; font-weight: 700; }

.service { display: grid; grid-template-columns: minmax(280px, .85fr) minmax(520px, 1.15fr); gap: clamp(56px, 9vw, 132px); align-items: start; }
.service-statement { position: sticky; top: calc(var(--header-height) + 50px); }
.service-statement > p:not(.section-intro) { max-width: 34rem; margin: 26px 0 0; color: var(--ink-soft); }
.text-link { display: inline-block; margin-top: 28px; color: var(--brand-deep); font-weight: 750; text-underline-offset: 5px; }
.service-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--ink); }
.service-list li { display: grid; grid-template-columns: 48px 1fr; gap: 26px; padding: 31px 0; border-bottom: 1px solid var(--line); }
.service-list li > span { color: var(--brand); font-size: 13px; font-weight: 750; font-variant-numeric: tabular-nums; }
.service-list h3 { margin: 0 0 7px; font-size: 21px; }
.service-list p { max-width: 48rem; margin: 0; color: var(--ink-soft); }

.about { display: grid; grid-template-columns: 1.05fr .95fr; min-height: 670px; background: var(--surface-subtle); }
.about-image { min-height: 670px; overflow: hidden; }
.about-image img { width: 100%; height: 100%; object-fit: cover; filter: saturate(.78) contrast(1.04); }
.about-copy { align-self: center; max-width: 650px; padding: clamp(64px, 9vw, 128px); }
.about-copy > p:not(.section-intro) { margin: 28px 0 0; color: var(--ink-soft); }
.about-details { display: grid; grid-template-columns: minmax(110px, .7fr) minmax(220px, 1.3fr); gap: 12px 24px; margin-top: 38px; padding-top: 28px; border-top: 1px solid var(--line); }
.about-details span { color: var(--muted); font-size: 13px; }
.about-details strong { font-size: 14px; }

.contact-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 42px;
  padding: clamp(72px, 9vw, 118px) max(24px, calc((100vw - 1180px) / 2));
  color: var(--surface);
  background: var(--brand);
}

.contact-strip p { margin: 0 0 10px; font-size: 14px; font-weight: 700; }
.contact-strip h2 { max-width: 18ch; font-size: clamp(2rem, 3.5vw, 3.9rem); }
.button-light { flex: 0 0 auto; color: var(--navy); background: var(--surface); }
.button-light:hover { color: var(--surface); background: var(--navy); }

.site-footer { padding: 60px max(24px, calc((100vw - 1180px) / 2)) 28px; color: oklch(0.82 0.014 255); background: oklch(0.17 0.045 255); }
.footer-top { display: grid; grid-template-columns: 1fr auto auto; align-items: center; gap: clamp(40px, 7vw, 96px); padding-bottom: 46px; }
.footer-brand { width: 206px; padding: 10px 12px; background: var(--surface); }
.footer-contact { display: flex; flex-direction: column; line-height: 1.4; }
.footer-contact span { color: oklch(0.66 0.018 255); font-size: 12px; }
.footer-contact a { color: var(--surface); font-size: 20px; font-weight: 750; text-decoration: none; }
.footer-top nav { display: flex; gap: 28px; }
.footer-top nav a { font-size: 13px; text-decoration: none; }
.footer-top nav a:hover { color: var(--surface); }
.footer-bottom { display: flex; justify-content: space-between; gap: 24px; padding-top: 26px; border-top: 1px solid oklch(1 0 0 / .12); color: oklch(0.63 0.018 255); font-size: 12px; }
.footer-bottom p { margin: 0; }

.mobile-contact { display: none; }

@media (max-width: 1080px) {
  :root { --header-height: 78px; }
  .header-call { display: none; }
  .hero { grid-template-columns: .9fr 1.1fr; }
  .hero-copy { padding-right: 42px; }
  .hero-proof { flex-wrap: wrap; }
  .route-explorer { grid-template-columns: 1fr; }
  .route-stage { min-height: 600px; }
  .route-list { display: grid; grid-template-columns: 1fr 1fr; padding: 12px 28px; }
  .route-option:nth-child(odd) { padding-right: 24px; }
  .route-option:nth-child(even) { padding-left: 24px; border-left: 1px solid var(--line); }
  .travel-modes { grid-template-columns: 1fr 1fr; }
  .mode-train { grid-column: 1 / -1; min-height: 390px; }
  .service { grid-template-columns: 1fr; }
  .service-statement { position: static; }
  .about-copy { padding: 64px; }
}

@media (max-width: 780px) {
  :root { --header-height: 70px; --content: calc(100vw - 36px); }
  body { padding-bottom: 68px; }
  .site-header { backdrop-filter: none; }
  .brand img { width: 168px; }
  .menu-toggle { display: grid; place-items: center; }
  .menu-toggle[aria-expanded="true"] .menu-lines i:first-child { transform: translateY(4.5px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] .menu-lines i:last-child { transform: translateY(-4.5px) rotate(-45deg); }
  .site-nav {
    position: fixed;
    inset: var(--header-height) 0 auto;
    z-index: var(--z-menu);
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 16px 18px 28px;
    color: var(--surface);
    background: var(--navy);
    transform: translateY(-120%);
    visibility: hidden;
    transition: transform 320ms var(--ease-out), visibility 320ms;
  }
  .site-nav.is-open { transform: translateY(0); visibility: visible; }
  .site-nav a { min-height: 56px; display: flex; align-items: center; padding: 0 8px; color: var(--surface); border-bottom: 1px solid oklch(1 0 0 / .15); }
  .site-nav a::after { display: none; }
  .hero { min-height: auto; grid-template-columns: 1fr; }
  .hero-copy { width: var(--content); margin: 0 auto; padding: 72px 0 66px; }
  .hero h1 { font-size: clamp(2.6rem, 10.7vw, 4rem); }
  .hero-lead { line-height: 1.75; }
  .hero-proof { gap: 20px 28px; margin-top: 48px; }
  .hero-proof li { min-width: 118px; }
  .hero-visual { min-height: 350px; }
  .hero-visual img { min-height: 350px; }
  .hero-visual::after { background: linear-gradient(0deg, var(--navy) 0%, transparent 24%); }
  .hero-scroll { display: none; }
  .section-heading { align-items: flex-start; flex-direction: column; gap: 22px; }
  .section-heading h2, .service-statement h2, .about-copy h2, .contact-strip h2 { font-size: clamp(2.25rem, 10vw, 3.4rem); }
  .route-stage { min-height: 560px; }
  .route-stage-copy { left: 24px; right: 24px; bottom: 28px; }
  .route-stage-copy h3 { font-size: clamp(2.4rem, 12vw, 3.8rem); }
  .route-stage-footer { align-items: flex-start; flex-direction: column; gap: 8px; }
  .route-list { grid-template-columns: 1fr; padding: 0 22px; }
  .route-option:nth-child(odd), .route-option:nth-child(even) { padding: 20px 0; border-left: 0; }
  .travel-modes { grid-template-columns: 1fr; }
  .travel-mode, .mode-train { grid-column: auto; min-height: 500px; }
  .travel-mode + .travel-mode { border-left: 0; border-top: 1px solid oklch(1 0 0 / .26); }
  .service-list li { grid-template-columns: 34px 1fr; gap: 14px; }
  .about { grid-template-columns: 1fr; }
  .about-image { min-height: 420px; }
  .about-copy { padding: 64px 24px 76px; }
  .about-details { grid-template-columns: 1fr; gap: 4px; }
  .about-details strong { margin-bottom: 14px; }
  .contact-strip { align-items: flex-start; flex-direction: column; }
  .footer-top { grid-template-columns: 1fr; justify-items: start; gap: 30px; }
  .footer-top nav { flex-wrap: wrap; }
  .footer-bottom { flex-direction: column; gap: 8px; }
  .mobile-contact {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: var(--z-mobile-contact);
    min-height: 68px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 16px max(10px, env(safe-area-inset-bottom));
    color: var(--ink);
    background: var(--surface);
    box-shadow: 0 -6px 8px oklch(0.18 0.03 255 / .08);
  }
  .mobile-contact span { display: flex; flex-direction: column; color: var(--muted); font-size: 11px; line-height: 1.25; }
  .mobile-contact strong { color: var(--ink); font-size: 14px; }
  .mobile-contact a { min-height: 46px; display: inline-flex; align-items: center; padding: 0 22px; border-radius: 3px; color: var(--surface); background: var(--brand); font-weight: 750; text-decoration: none; }
}

@media (max-width: 440px) {
  .hero-actions { flex-direction: column; }
  .button { width: 100%; }
  .hero-visual, .hero-visual img { min-height: 300px; }
  .route-stage { min-height: 520px; }
  .travel-mode, .mode-train { min-height: 460px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}