:root {
  color-scheme: dark;
  --bg: #100b0a;
  --bg-2: #19100d;
  --panel: #2a1712;
  --panel-2: #3a1d16;
  --text: #fff7ec;
  --muted: #d9c7b8;
  --soft: #a98f82;
  --line: rgba(255, 247, 236, 0.16);
  --accent: #f24a2e;
  --accent-2: #ffb21a;
  --accent-3: #52d7c7;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.42);
  --max: 1080px;
  --header: 68px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 12% 8%, rgba(242, 74, 46, 0.34), transparent 24%),
    radial-gradient(circle at 82% 24%, rgba(255, 178, 26, 0.16), transparent 24%),
    linear-gradient(115deg, transparent 0 38%, rgba(242, 74, 46, 0.1) 38.2% 39.2%, transparent 39.4% 100%),
    linear-gradient(90deg, rgba(255, 255, 255, 0.024) 1px, transparent 1px),
    linear-gradient(180deg, rgba(255, 255, 255, 0.016) 1px, transparent 1px),
    linear-gradient(180deg, #120604 0%, #1a0b08 32%, #100807 64%, #070505 100%);
  background-size: auto, auto, auto, 72px 72px, 72px 72px, auto;
  color: var(--text);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", Arial, sans-serif;
  line-height: 1.62;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

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

p,
h1,
h2,
h3,
figure,
dl,
dd {
  margin: 0;
}

p {
  color: var(--muted);
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  transform: translateY(-140%);
  background: var(--accent-2);
  color: #1a0c05;
  padding: 10px 14px;
  border-radius: 6px;
  font-weight: 800;
}

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

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  height: var(--header);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 0 clamp(18px, 4vw, 48px);
  background: rgba(16, 11, 10, 0.62);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(18px);
  transition: background 180ms ease, box-shadow 180ms ease;
}

.site-header.is-scrolled {
  background: rgba(16, 11, 10, 0.9);
  box-shadow: 0 14px 38px rgba(0, 0, 0, 0.28);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  font-weight: 900;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent-2), var(--accent));
  color: #160604;
  border: 2px solid rgba(255, 255, 255, 0.28);
  box-shadow: 0 0 28px rgba(242, 74, 46, 0.28);
}

.brand-text {
  font-size: 17px;
  letter-spacing: 0;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.site-nav a {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  padding: 0 11px;
  border-radius: 6px;
  color: rgba(255, 247, 236, 0.82);
  font-size: 13px;
  font-weight: 700;
  transition: background 160ms ease, color 160ms ease, transform 160ms ease;
}

.site-nav a:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  transform: translateY(-1px);
}

.site-nav .nav-cta {
  margin-left: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #190805;
}

.nav-toggle {
  display: none;
  min-width: 54px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  padding: 0 12px;
  font: inherit;
  font-size: 14px;
  font-weight: 900;
  line-height: 1;
  cursor: pointer;
}

.hero {
  position: relative;
  min-height: auto;
  display: grid;
  align-items: start;
  overflow: hidden;
  isolation: isolate;
}

.hero-media,
.hero-media img,
.hero-shade,
.hero-lines {
  position: absolute;
  inset: 0;
}

.hero-media {
  z-index: -4;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 28%;
  filter: saturate(1.16) contrast(1.08);
  transform: scale(1.03);
}

.hero-shade {
  z-index: -3;
  background:
    linear-gradient(90deg, rgba(14, 5, 4, 0.92) 0%, rgba(28, 10, 7, 0.74) 34%, rgba(14, 6, 5, 0.3) 70%),
    linear-gradient(0deg, rgba(20, 7, 5, 1) 0%, rgba(20, 7, 5, 0.2) 42%, rgba(16, 7, 5, 0.18) 100%);
}

.hero-lines {
  z-index: -2;
  opacity: 0.36;
  background:
    linear-gradient(116deg, transparent 0 42%, rgba(255, 178, 26, 0.45) 42.2% 42.7%, transparent 43% 100%),
    linear-gradient(102deg, transparent 0 58%, rgba(242, 74, 46, 0.55) 58.2% 58.75%, transparent 59% 100%);
}

.hero-inner {
  width: min(100%, var(--max));
  margin: 0 auto;
  padding: calc(var(--header) + 58px) clamp(16px, 3.5vw, 28px) 42px;
}

.eyebrow,
.section-kicker {
  color: var(--accent-2);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero h1 {
  margin-top: 10px;
  max-width: 780px;
  font-size: clamp(34px, 5.4vw, 68px);
  line-height: 0.95;
  font-weight: 950;
  color: var(--accent-2);
  text-shadow:
    0 2px 0 rgba(242, 74, 46, 0.72),
    0 16px 48px rgba(0, 0, 0, 0.58);
}

.hero-subtitle {
  max-width: 700px;
  margin-top: 22px;
  font-size: clamp(15px, 1.65vw, 19px);
  color: rgba(255, 247, 236, 0.88);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 26px;
}

.btn {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  border-radius: 6px;
  font-weight: 900;
  border: 1px solid transparent;
  position: relative;
  overflow: hidden;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease, border-color 180ms ease;
}

.btn::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(110deg, transparent 0%, rgba(255, 255, 255, 0.34) 48%, transparent 56%);
  transform: translateX(-120%);
  transition: transform 420ms ease;
  pointer-events: none;
}

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

.btn:hover::after {
  transform: translateX(120%);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #170705;
  box-shadow: 0 18px 44px rgba(242, 74, 46, 0.28);
}

.btn-primary:hover {
  box-shadow: 0 20px 52px rgba(242, 74, 46, 0.42);
}

.btn-ghost {
  border-color: rgba(255, 247, 236, 0.34);
  background: rgba(255, 247, 236, 0.08);
  color: var(--text);
}

.btn-ghost:hover {
  border-color: rgba(255, 178, 26, 0.62);
  background: rgba(255, 178, 26, 0.1);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 160px));
  gap: 12px;
  margin-top: 32px;
}

.hero-stats div {
  padding: 11px 14px;
  border-left: 3px solid var(--accent);
  background: rgba(255, 247, 236, 0.08);
  backdrop-filter: blur(8px);
}

.hero-stats dt {
  color: var(--soft);
  font-size: 12px;
  font-weight: 800;
}

.hero-stats dd {
  margin-top: 2px;
  color: var(--text);
  font-weight: 900;
}

.section {
  width: min(100%, var(--max));
  margin: 0 auto;
  padding: 70px clamp(16px, 3.5vw, 28px);
  position: relative;
}

.intro-section,
.gallery-section,
.guide-section,
.faq-section {
  background:
    linear-gradient(180deg, rgba(58, 20, 14, 0.18), rgba(10, 7, 7, 0.02)),
    transparent;
}

.section::before {
  content: "";
  position: absolute;
  top: 0;
  left: clamp(16px, 3.5vw, 28px);
  width: 72px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  opacity: 0.76;
}

.section-head {
  max-width: 760px;
  margin-bottom: 28px;
}

.section h2 {
  margin-top: 8px;
  color: var(--accent-2);
  font-size: clamp(20px, 2.35vw, 30px);
  line-height: 1.08;
  font-weight: 950;
  text-shadow: 0 10px 32px rgba(242, 74, 46, 0.22);
  position: relative;
  display: inline-block;
  padding-bottom: 12px;
}

.section h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 54%;
  min-width: 86px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), rgba(255, 178, 26, 0));
}

.section h3 {
  color: var(--text);
  font-size: 18px;
  line-height: 1.28;
}

.section-head p,
.copy p {
  margin-top: 16px;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 0.82fr);
  gap: clamp(22px, 4vw, 48px);
  align-items: center;
}

.split.reverse {
  grid-template-columns: minmax(320px, 0.82fr) minmax(0, 1fr);
}

.copy {
  max-width: 690px;
}

.feature-shot,
.shot-card,
.route-image {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(58, 29, 22, 0.92), rgba(22, 11, 9, 0.96));
  box-shadow: var(--shadow);
  transition: transform 220ms ease, border-color 220ms ease, box-shadow 220ms ease;
}

.feature-shot::after,
.shot-card::after,
.route-image::after {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid rgba(255, 178, 26, 0.18);
  pointer-events: none;
  opacity: 0.72;
  transition: opacity 220ms ease, inset 220ms ease;
  z-index: 2;
}

.feature-shot img,
.shot-card img,
.route-image img {
  width: 100%;
  object-fit: cover;
  transition: transform 360ms ease, filter 360ms ease;
}

.feature-shot:hover,
.shot-card:hover,
.route-image:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 178, 26, 0.46);
  box-shadow: 0 28px 76px rgba(0, 0, 0, 0.5);
}

.feature-shot:hover img,
.shot-card:hover img,
.route-image:hover img {
  transform: scale(1.035);
  filter: saturate(1.08) contrast(1.04);
}

.feature-shot:hover::after,
.shot-card:hover::after,
.route-image:hover::after {
  inset: 7px;
  opacity: 1;
}

.feature-shot figcaption,
.shot-card figcaption,
.route-image figcaption {
  padding: 11px 14px 13px;
  color: var(--muted);
  font-size: 13px;
  background: rgba(16, 11, 10, 0.88);
}

.dark-band {
  width: 100%;
  max-width: none;
  padding-left: max(clamp(16px, 3.5vw, 28px), calc((100vw - var(--max)) / 2 + 28px));
  padding-right: max(clamp(16px, 3.5vw, 28px), calc((100vw - var(--max)) / 2 + 28px));
  background:
    radial-gradient(circle at 18% 0%, rgba(255, 178, 26, 0.14), transparent 24%),
    linear-gradient(135deg, rgba(242, 74, 46, 0.24), transparent 34%),
    linear-gradient(180deg, #1b0906, #0e0706);
  border-block: 1px solid rgba(255, 255, 255, 0.08);
  position: relative;
  overflow: hidden;
}

.dark-band::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: min(34vw, 440px);
  height: 100%;
  background: linear-gradient(115deg, transparent 0 42%, rgba(255, 178, 26, 0.08) 42.2% 48%, transparent 48.2% 100%);
  pointer-events: none;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.feature-card,
.system-card,
.update-card,
.route-item,
.step,
.faq-item {
  border: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(255, 178, 26, 0.05), transparent),
    rgba(42, 18, 13, 0.74);
  transition: transform 200ms ease, border-color 200ms ease, background 200ms ease, box-shadow 200ms ease;
}

.feature-card {
  min-height: 232px;
  padding: 20px;
  position: relative;
}

.feature-card::after,
.system-card::after,
.update-card::after,
.route-item::after,
.step::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, rgba(255, 178, 26, 0.42), rgba(242, 74, 46, 0));
  clip-path: polygon(100% 0, 0 0, 100% 100%);
  opacity: 0.72;
  pointer-events: none;
}

.feature-card::before,
.system-card::before,
.update-card::before,
.route-item::before,
.step::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: linear-gradient(135deg, rgba(255, 178, 26, 0.14), transparent 44%);
  opacity: 0;
  transition: opacity 200ms ease;
  pointer-events: none;
}

.feature-card,
.system-card,
.update-card,
.route-item,
.step {
  position: relative;
  overflow: hidden;
}

.feature-card:hover,
.system-card:hover,
.update-card:hover,
.route-item:hover,
.step:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 178, 26, 0.42);
  background:
    linear-gradient(180deg, rgba(255, 178, 26, 0.09), rgba(242, 74, 46, 0.05)),
    rgba(54, 22, 15, 0.82);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.28);
}

.feature-card:hover::before,
.system-card:hover::before,
.update-card:hover::before,
.route-item:hover::before,
.step:hover::before {
  opacity: 1;
}

.card-index {
  display: inline-flex;
  color: var(--accent-2);
  font-size: 13px;
  font-weight: 950;
  margin-bottom: 24px;
}

.feature-card h3 {
  margin-bottom: 12px;
}

.gallery {
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  gap: 14px;
}

.shot-card.wide {
  grid-column: 1 / -1;
}

.shot-card img {
  aspect-ratio: 16 / 9;
}

.shot-card:not(.wide):nth-child(3) {
  margin-top: 26px;
}

.routes-section {
  background:
    radial-gradient(circle at 84% 20%, rgba(242, 74, 46, 0.14), transparent 28%),
    linear-gradient(180deg, rgba(70, 24, 16, 0.22), rgba(255, 247, 236, 0)),
    transparent;
}

.routes-section .section-head {
  border-left: 4px solid var(--accent);
  padding-left: 18px;
}

.routes-section .section-head h2::after {
  width: 44%;
}

.systems-section {
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  background:
    linear-gradient(115deg, rgba(242, 74, 46, 0.08), transparent 36%),
    rgba(9, 7, 7, 0.42);
}

.systems-section .split {
  padding: clamp(18px, 3vw, 28px);
  background:
    linear-gradient(135deg, rgba(255, 178, 26, 0.11), transparent 38%),
    rgba(46, 18, 12, 0.58);
  border: 1px solid rgba(255, 255, 255, 0.09);
}

.guide-section .section-head {
  margin-left: auto;
  margin-right: auto;
  text-align: center;
}

.guide-section .section-head h2::after {
  left: 50%;
  transform: translateX(-50%);
}

.updates-section {
  padding-top: 52px;
}

.updates-section .update-card {
  min-height: 150px;
}

.routes-layout {
  display: grid;
  grid-template-columns: minmax(330px, 0.92fr) minmax(0, 1fr);
  gap: clamp(20px, 3.5vw, 38px);
  align-items: start;
}

.route-image {
  position: sticky;
  top: 96px;
}

.route-list {
  display: grid;
  gap: 14px;
}

.route-item,
.system-card,
.update-card {
  padding: 18px;
}

.route-item h3,
.system-card h3,
.update-card h3 {
  margin-bottom: 8px;
}

.system-grid,
.updates-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-top: 26px;
}

.updates-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.timeline {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
}

.step {
  min-height: 236px;
  padding: 18px;
}

.step span {
  display: inline-flex;
  color: var(--accent-3);
  font-size: 13px;
  font-weight: 900;
  margin-bottom: 12px;
}

.step h3 {
  margin-bottom: 12px;
}

.download-section {
  padding-top: 40px;
}

.download-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: clamp(22px, 4vw, 38px);
  background:
    linear-gradient(112deg, transparent 0 58%, rgba(255, 178, 26, 0.18) 58.3% 62%, transparent 62.3% 100%),
    radial-gradient(circle at 12% 18%, rgba(255, 178, 26, 0.2), transparent 26%),
    linear-gradient(120deg, rgba(242, 74, 46, 0.42), rgba(76, 25, 14, 0.76)),
    #1b0906;
  border: 1px solid rgba(255, 178, 26, 0.28);
  box-shadow: var(--shadow);
}

.download-panel h2 {
  font-size: clamp(21px, 2.45vw, 32px);
}

.download-panel p {
  max-width: 760px;
  margin-top: 12px;
}

.faq-list {
  display: grid;
  gap: 12px;
}

.faq-item {
  padding: 0;
}

.faq-item:hover {
  border-color: rgba(255, 178, 26, 0.42);
  background: linear-gradient(180deg, rgba(255, 247, 236, 0.11), rgba(255, 247, 236, 0.045));
}

.faq-item summary {
  cursor: pointer;
  padding: 16px 18px;
  color: var(--text);
  font-size: 16px;
  font-weight: 900;
  transition: color 180ms ease, padding-left 180ms ease;
}

.faq-item summary:hover {
  color: var(--accent-2);
  padding-left: 22px;
}

.faq-item p {
  padding: 0 18px 18px;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: #0b0707;
}

.footer-inner {
  width: min(100%, var(--max));
  margin: 0 auto;
  padding: 28px clamp(16px, 3.5vw, 28px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.footer-inner p {
  margin-top: 6px;
  max-width: 650px;
  font-size: 14px;
}

.footer-inner nav {
  display: flex;
  gap: 14px;
  color: var(--muted);
  font-weight: 800;
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 520ms ease, transform 520ms ease;
}

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reveal,
  .btn,
  .site-nav a,
  .site-header {
    transition: none;
  }
}

@media (max-width: 1060px) {
  .feature-grid,
  .system-grid,
  .timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .split,
  .split.reverse,
  .routes-layout {
    grid-template-columns: 1fr;
  }

  .route-image {
    position: static;
  }
}

@media (max-width: 820px) {
  :root {
    --header: 60px;
  }

  .site-header {
    padding: 0 16px;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: fixed;
    top: var(--header);
    left: 0;
    right: 0;
    display: grid;
    gap: 0;
    padding: 10px 16px 18px;
    background: rgba(16, 11, 10, 0.96);
    border-bottom: 1px solid var(--line);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: opacity 180ms ease, transform 180ms ease;
  }

  .site-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .site-nav a {
    border-radius: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    padding: 13px 2px;
  }

  .site-nav .nav-cta {
    justify-content: center;
    margin: 14px 0 0;
    border-radius: 6px;
    border-bottom: 0;
  }

  .hero {
    min-height: auto;
  }

  .hero-shade {
    background:
      linear-gradient(180deg, rgba(16, 11, 10, 0.28) 0%, rgba(16, 11, 10, 0.78) 50%, rgba(16, 11, 10, 1) 100%),
      linear-gradient(90deg, rgba(16, 11, 10, 0.8), rgba(16, 11, 10, 0.24));
  }

  .hero-media img {
    object-position: center 18%;
  }

  .hero-inner {
    padding-top: calc(var(--header) + 32px);
    padding-bottom: 30px;
  }

  .hero h1 {
    font-size: clamp(32px, 9.5vw, 44px);
  }

  .hero-stats {
    grid-template-columns: 1fr;
    max-width: 360px;
  }

  .section {
    padding-top: 54px;
    padding-bottom: 54px;
  }

  .gallery,
  .updates-grid {
    grid-template-columns: 1fr;
  }

  .shot-card:not(.wide):nth-child(3) {
    margin-top: 0;
  }

  .download-panel,
  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}

@media (max-width: 560px) {
  .brand-text {
    font-size: 15px;
  }

  .hero-actions,
  .btn {
    width: 100%;
  }

  .feature-grid,
  .system-grid,
  .timeline {
    grid-template-columns: 1fr;
  }

  .feature-card,
  .step {
    min-height: auto;
  }

  .footer-inner nav {
    flex-wrap: wrap;
  }
}