:root {
  --bg: #07111d;
  --bg-soft: #0d1a2a;
  --panel: rgba(13, 26, 42, 0.78);
  --panel-strong: rgba(18, 34, 52, 0.94);
  --line: rgba(175, 216, 255, 0.18);
  --text: #edf6ff;
  --muted: #a9bdd1;
  --soft: #d6e8f8;
  --cyan: #47d6ff;
  --gold: #f4bd68;
  --green: #65e4b0;
  --heading: #f5fbff;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.34);
  --radius: 8px;
  --max: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", Arial, sans-serif;
  color: var(--text);
  background:
    linear-gradient(180deg, rgba(7, 17, 29, 0.78), #07111d 430px),
    radial-gradient(circle at 20% 8%, rgba(71, 214, 255, 0.18), transparent 30%),
    linear-gradient(145deg, #07111d 0%, #0a1827 45%, #111827 100%);
  line-height: 1.7;
}

body.nav-open {
  overflow: hidden;
}

.icon-sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

.icon {
  width: 1.05em;
  height: 1.05em;
  flex: 0 0 auto;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}

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

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

p {
  margin: 0 0 1rem;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.15;
  letter-spacing: 0;
}

h1 {
  font-size: clamp(2.2rem, 5.2vw, 4.45rem);
  max-width: 760px;
  color: var(--heading);
  text-shadow: 0 0 28px rgba(71, 214, 255, 0.2);
}

h2 {
  font-size: clamp(1.55rem, 3vw, 2.35rem);
  color: var(--heading);
}

.hero h1 {
  width: fit-content;
  max-width: 760px;
  color: transparent;
  background: linear-gradient(135deg, #ffffff 12%, var(--cyan) 54%, var(--gold) 100%);
  -webkit-background-clip: text;
  background-clip: text;
}

.section h2,
.gallery-section h2,
.cta-section h2 {
  position: relative;
  padding-bottom: 14px;
}

.section h2::after,
.gallery-section h2::after,
.cta-section h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 58px;
  height: 3px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--cyan), var(--gold));
  box-shadow: 0 0 18px rgba(71, 214, 255, 0.26);
}

h3 {
  font-size: 1.18rem;
}

.container {
  width: min(100% - 40px, var(--max));
  margin-inline: auto;
}

.skip-link {
  position: fixed;
  left: 16px;
  top: 16px;
  z-index: 1000;
  padding: 10px 14px;
  color: #06101a;
  background: var(--cyan);
  border-radius: var(--radius);
  transform: translateY(-140%);
  transition: transform 0.2s ease;
}

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

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 80;
  background: rgba(7, 17, 29, 0.72);
  border-bottom: 1px solid transparent;
  backdrop-filter: blur(16px);
  transition: background 0.2s ease, border-color 0.2s ease;
}

.site-header.is-scrolled {
  background: rgba(7, 17, 29, 0.92);
  border-color: var(--line);
}

.header-inner {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

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

.brand-logo {
  width: 40px;
  height: 40px;
  display: block;
  flex: 0 0 auto;
  object-fit: cover;
  background: linear-gradient(135deg, var(--cyan), var(--gold));
  border-radius: 8px;
  box-shadow: 0 0 24px rgba(71, 214, 255, 0.28);
}

.brand-text {
  display: grid;
  gap: 1px;
  font-weight: 800;
}

.brand-text small {
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

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

.site-nav a {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 12px;
  color: var(--soft);
  border-radius: 8px;
  font-size: 0.95rem;
  transition: color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

.site-nav a::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 4px;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--gold));
  border-radius: 999px;
  opacity: 0;
  transform: scaleX(0.35);
  transform-origin: center;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: white;
  background: rgba(255, 255, 255, 0.08);
  transform: translateY(-1px);
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  opacity: 1;
  transform: scaleX(1);
}

.site-nav .nav-download {
  margin-left: 8px;
  color: #07111d;
  background: linear-gradient(135deg, var(--cyan), var(--gold));
  font-weight: 900;
  box-shadow: 0 10px 28px rgba(71, 214, 255, 0.18);
}

.site-nav .nav-download:hover,
.site-nav .nav-download:focus-visible {
  color: #07111d;
  background: linear-gradient(135deg, #6ee2ff, #ffd085);
  box-shadow: 0 14px 34px rgba(244, 189, 104, 0.22);
}

.site-nav .nav-download::after {
  display: none;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.nav-toggle span {
  width: 18px;
  height: 2px;
  display: block;
  margin: 4px auto;
  background: var(--text);
  border-radius: 10px;
  transform-origin: center;
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.nav-toggle.is-open span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle.is-open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-open span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.hero {
  position: relative;
  min-height: 92vh;
  display: grid;
  align-items: end;
  overflow: hidden;
  padding: 132px 0 54px;
}

.hero-bg,
.hero-layer {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-bg {
  object-fit: cover;
  object-position: center;
  filter: saturate(1.05) contrast(1.02);
  transform: scale(1.01);
}

.hero-layer {
  background:
    linear-gradient(90deg, rgba(7, 17, 29, 0.94), rgba(7, 17, 29, 0.64) 45%, rgba(7, 17, 29, 0.22)),
    linear-gradient(180deg, rgba(7, 17, 29, 0.05), #07111d 94%);
}

.hero-content {
  position: relative;
  z-index: 2;
}

.eyebrow,
.section-kicker {
  margin: 0 0 14px;
  color: var(--cyan);
  font-size: 0.84rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero-lead {
  max-width: 690px;
  margin: 22px 0 30px;
  color: var(--soft);
  font-size: clamp(1.04rem, 2vw, 1.26rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.btn {
  position: relative;
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-weight: 800;
  overflow: hidden;
  transition: transform 0.18s ease, border-color 0.18s ease, background 0.18s ease, box-shadow 0.18s ease;
}

.btn .icon,
.site-nav .icon {
  transition: transform 0.18s ease;
}

.btn:hover .icon,
.btn:focus-visible .icon,
.site-nav a:hover .icon,
.site-nav a:focus-visible .icon {
  transform: translateY(-1px) scale(1.08);
}

.btn::before {
  content: "";
  position: absolute;
  inset: -2px auto -2px -55%;
  width: 42%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.42), transparent);
  transform: skewX(-18deg);
  transition: left 0.45s ease;
}

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

.btn:hover::before,
.btn:focus-visible::before {
  left: 115%;
}

.btn-primary {
  color: #07111d;
  background: linear-gradient(135deg, var(--cyan), var(--gold));
  box-shadow: 0 14px 42px rgba(71, 214, 255, 0.22);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  box-shadow: 0 18px 52px rgba(244, 189, 104, 0.26);
}

.btn-ghost {
  color: white;
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.24);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  border-color: rgba(71, 214, 255, 0.42);
  background: rgba(71, 214, 255, 0.13);
}

.btn-secondary {
  color: var(--text);
  background: rgba(71, 214, 255, 0.1);
  border-color: rgba(71, 214, 255, 0.34);
}

.hero-stats {
  width: min(100%, 820px);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin: 42px 0 0;
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
  box-shadow: var(--shadow);
}

.hero-stats div {
  padding: 18px;
  background: rgba(8, 21, 35, 0.82);
}

.hero-stats dt {
  color: var(--muted);
  font-size: 0.82rem;
}

.hero-stats dd {
  margin: 4px 0 0;
  color: white;
  font-weight: 800;
}

.section {
  padding: 96px 0;
}

.overview {
  padding-top: 70px;
}

.overview-grid,
.split,
.guide-layout,
.faq-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(320px, 0.92fr);
  gap: 44px;
  align-items: center;
}

.overview-copy p,
.section-copy p,
.section-head p,
.faq-layout > div > p,
.cta-inner p {
  color: var(--muted);
}

.info-panel {
  display: grid;
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
}

.info-panel,
.media-frame,
.feature-card,
.guide-item,
.timeline-item,
.faq-list details,
.cta-inner {
  transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease, background 0.22s ease;
}

.info-panel:hover,
.media-frame:hover,
.guide-item:hover,
.timeline-item:hover,
.faq-list details:hover {
  transform: translateY(-3px);
  border-color: rgba(71, 214, 255, 0.36);
  box-shadow: 0 18px 58px rgba(0, 0, 0, 0.24), 0 0 32px rgba(71, 214, 255, 0.08);
}

.panel-row {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 18px;
  background: var(--panel-strong);
}

.panel-row span {
  color: var(--muted);
}

.panel-row strong {
  text-align: right;
}

.intro-section {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0)),
    #0a1624;
}

.media-frame {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #101926;
  box-shadow: var(--shadow);
}

.media-frame img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.media-frame:hover img {
  transform: scale(1.035);
}

.section-copy {
  max-width: 620px;
}

.feature-section {
  background: linear-gradient(180deg, #07111d, #0b1724);
}

.section-head {
  max-width: 760px;
  margin-bottom: 34px;
}

.section-head.compact {
  margin-bottom: 24px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.feature-card,
.guide-item,
.timeline-item,
.faq-list details {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: 0 14px 46px rgba(0, 0, 0, 0.16);
}

.feature-card {
  min-height: 210px;
  padding: 22px;
  position: relative;
  overflow: hidden;
  transition: transform 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.feature-card::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(135deg, rgba(71, 214, 255, 0.15), transparent 42%),
    linear-gradient(315deg, rgba(244, 189, 104, 0.12), transparent 46%);
  opacity: 0;
  transition: opacity 0.22s ease;
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: rgba(71, 214, 255, 0.42);
  background: rgba(16, 36, 57, 0.92);
}

.feature-card:hover::before {
  opacity: 1;
}

.card-index {
  display: inline-flex;
  margin-bottom: 28px;
  color: var(--gold);
  font-weight: 900;
}

.feature-card p,
.guide-item p,
.timeline-item p,
.faq-list p {
  color: var(--muted);
}

.gallery-section {
  padding: 90px 0;
  background: #0a1624;
}

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

.gallery-grid figure {
  position: relative;
  min-height: 230px;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #101926;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.18);
  transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease;
}

.gallery-grid figure::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, transparent 46%, rgba(7, 17, 29, 0.56));
  opacity: 0.72;
  transition: opacity 0.22s ease;
}

.gallery-grid img {
  width: 100%;
  height: 100%;
  min-height: 230px;
  object-fit: cover;
  transition: transform 0.45s ease;
}

.gallery-grid figure:hover img {
  transform: scale(1.05);
}

.gallery-grid figure:hover {
  transform: translateY(-5px);
  border-color: rgba(244, 189, 104, 0.42);
  box-shadow: 0 20px 64px rgba(0, 0, 0, 0.28), 0 0 34px rgba(244, 189, 104, 0.08);
}

.gallery-grid figure:hover::after {
  opacity: 0.4;
}

.gallery-grid figcaption {
  position: absolute;
  z-index: 1;
  left: 12px;
  right: 12px;
  bottom: 12px;
  padding: 8px 10px;
  color: white;
  font-weight: 800;
  background: rgba(7, 17, 29, 0.72);
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 8px;
  backdrop-filter: blur(10px);
  transition: transform 0.22s ease, background 0.22s ease, border-color 0.22s ease;
}

.gallery-grid figure:hover figcaption {
  transform: translateY(-3px);
  background: rgba(7, 17, 29, 0.84);
  border-color: rgba(71, 214, 255, 0.28);
}

.guide-section {
  background:
    linear-gradient(180deg, rgba(71, 214, 255, 0.04), transparent 36%),
    #07111d;
}

.guide-layout {
  grid-template-columns: 0.78fr 1.22fr;
  align-items: start;
}

.sticky-head {
  position: sticky;
  top: 96px;
  margin-bottom: 0;
}

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

.guide-item {
  padding: 22px;
}

.updates-section {
  background: #0a1624;
}

.timeline {
  display: grid;
  gap: 14px;
}

.timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 22px;
  padding: 20px;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -1px;
  top: 18px;
  bottom: 18px;
  width: 3px;
  background: linear-gradient(180deg, var(--cyan), var(--gold));
  border-radius: 999px;
  opacity: 0;
  transition: opacity 0.22s ease;
}

.timeline-item:hover::before {
  opacity: 1;
}

.timeline-item time {
  color: var(--gold);
  font-weight: 900;
}

.timeline-item.featured {
  border-color: rgba(71, 214, 255, 0.42);
  background: linear-gradient(135deg, rgba(71, 214, 255, 0.13), rgba(244, 189, 104, 0.08));
}

.faq-layout {
  grid-template-columns: 0.8fr 1.2fr;
  align-items: start;
}

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

.faq-list details {
  padding: 0 18px;
}

.faq-list summary {
  cursor: pointer;
  padding: 18px 0;
  font-weight: 900;
  transition: color 0.18s ease;
}

.faq-list summary::marker {
  color: var(--cyan);
}

.faq-list details:hover summary,
.faq-list details[open] summary {
  color: var(--cyan);
}

.faq-list details[open] {
  border-color: rgba(244, 189, 104, 0.36);
  background: rgba(16, 36, 57, 0.92);
}

.faq-list p {
  padding-bottom: 18px;
}

.cta-section {
  padding: 72px 0;
  background:
    linear-gradient(135deg, rgba(71, 214, 255, 0.14), rgba(244, 189, 104, 0.12)),
    #0a1624;
}

.cta-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 34px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius);
  background: rgba(7, 17, 29, 0.7);
}

.cta-inner:hover {
  transform: translateY(-3px);
  border-color: rgba(71, 214, 255, 0.34);
  box-shadow: 0 22px 70px rgba(0, 0, 0, 0.24), 0 0 36px rgba(71, 214, 255, 0.09);
}

.friend-links {
  padding: 54px 0 58px;
  text-align: center;
  background:
    linear-gradient(135deg, rgba(71, 214, 255, 0.1), rgba(244, 189, 104, 0.08)),
    linear-gradient(180deg, #07111d, #0a1624);
  border-top: 1px solid var(--line);
}

.friend-links h2 {
  display: inline-block;
  margin-bottom: 28px;
  padding-bottom: 12px;
  color: var(--heading);
  font-size: clamp(1.35rem, 2.5vw, 1.85rem);
}

.friend-links h2::after {
  left: 50%;
  transform: translateX(-50%);
}

.friend-link-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
}

.friend-link-list a {
  min-width: 118px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 20px;
  color: var(--soft);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(175, 216, 255, 0.22);
  border-radius: 999px;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.14);
  transition: transform 0.2s ease, color 0.2s ease, background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.friend-link-list a:hover,
.friend-link-list a:focus-visible {
  color: #07111d;
  background: linear-gradient(135deg, var(--cyan), var(--gold));
  border-color: transparent;
  transform: translateY(-3px);
  box-shadow: 0 16px 40px rgba(71, 214, 255, 0.2);
}

.cta-inner > div {
  max-width: 760px;
}

.site-footer {
  padding: 30px 0;
  color: var(--muted);
  background: #050b13;
  border-top: 1px solid var(--line);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.footer-inner p {
  margin: 0;
}

.footer-inner nav {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.footer-inner a:hover,
.footer-inner a:focus-visible {
  color: white;
}

[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (max-width: 980px) {
  .overview-grid,
  .split,
  .guide-layout,
  .faq-layout {
    grid-template-columns: 1fr;
  }

  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .gallery-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .sticky-head {
    position: static;
  }
}

@media (max-width: 760px) {
  .container {
    width: min(100% - 28px, var(--max));
  }

  .header-inner {
    min-height: 64px;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: fixed;
    left: 14px;
    right: 14px;
    top: 74px;
    display: grid;
    gap: 4px;
    padding: 12px;
    background: rgba(7, 17, 29, 0.96);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
  }

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

  .site-nav a {
    padding: 12px;
    justify-content: flex-start;
  }

  .hero {
    min-height: 88vh;
    padding-top: 110px;
  }

  .hero-layer {
    background:
      linear-gradient(180deg, rgba(7, 17, 29, 0.54), rgba(7, 17, 29, 0.95) 72%, #07111d),
      linear-gradient(90deg, rgba(7, 17, 29, 0.88), rgba(7, 17, 29, 0.42));
  }

  .hero-stats {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 68px 0;
  }

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

  .timeline-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }

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

  .friend-links {
    padding: 44px 0 48px;
  }

  .friend-link-list {
    gap: 10px;
  }

  .friend-link-list a {
    min-width: 0;
    width: calc(50% - 5px);
    padding-inline: 12px;
  }

}

@media (max-width: 480px) {
  h1 {
    font-size: 2.15rem;
  }

  .brand-text small {
    display: none;
  }

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

  .panel-row {
    flex-direction: column;
    gap: 4px;
  }

  .panel-row strong {
    text-align: left;
  }

  .friend-link-list a {
    width: 100%;
  }

}

@media (hover: none) {
  .site-nav a:hover,
  .btn:hover,
  .feature-card:hover,
  .gallery-grid figure:hover,
  .guide-item:hover,
  .timeline-item:hover,
  .faq-list details:hover,
  .friend-link-list a:hover,
  .cta-inner:hover {
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}