:root {
  --ink: #172033;
  --muted: #667085;
  --line: #e6eaf0;
  --paper: #ffffff;
  --soft: #f5f7fb;
  --deep: #111827;
  --blue: #0b74de;
  --cyan: #42c6ff;
  --rose: #ff7aaa;
  --gold: #ffc94d;
  --green: #34b989;
  --shadow: 0 18px 50px rgba(23, 32, 51, .11);
  --radius: 8px;
  --container: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans SC", Arial, sans-serif;
  line-height: 1.75;
}

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

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

:focus-visible {
  outline: 3px solid rgba(66, 198, 255, .72);
  outline-offset: 3px;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -80px;
  z-index: 100;
  padding: 10px 14px;
  color: #fff;
  background: var(--blue);
  border-radius: 6px;
  transition: top .2s ease;
}

.skip-link:focus {
  top: 12px;
}

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

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  background: rgba(13, 18, 34, .52);
  border-bottom: 1px solid rgba(255, 255, 255, .14);
  backdrop-filter: blur(14px);
  transition: background .2s ease, box-shadow .2s ease;
}

.site-header.is-scrolled {
  background: rgba(255, 255, 255, .94);
  box-shadow: 0 10px 30px rgba(17, 24, 39, .08);
}

.nav-wrap {
  width: min(100% - 40px, var(--container));
  min-height: 72px;
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-weight: 800;
  letter-spacing: 0;
  white-space: nowrap;
}

.brand img {
  width: 46px;
  height: 46px;
  border-radius: 8px;
}

.site-header.is-scrolled .brand {
  color: var(--ink);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.site-nav a {
  position: relative;
  min-height: 40px;
  padding: 7px 14px;
  color: rgba(255, 255, 255, .86);
  border-radius: 6px;
  font-size: 15px;
  font-weight: 700;
  transition: color .2s ease, background .2s ease, transform .2s ease;
}

.site-header.is-scrolled .site-nav a {
  color: #344054;
}

.site-nav a:hover,
.site-nav a.is-active {
  color: #fff;
  background: rgba(255, 255, 255, .16);
  transform: translateY(-1px);
}

.site-header.is-scrolled .site-nav a:hover,
.site-header.is-scrolled .site-nav a.is-active {
  color: var(--blue);
  background: #edf6ff;
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 1px solid rgba(255, 255, 255, .2);
  border-radius: 8px;
  background: rgba(255, 255, 255, .08);
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  margin: 5px 0;
  background: #fff;
  border-radius: 2px;
  transition: transform .2s ease, opacity .2s ease;
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

.site-header.is-scrolled .menu-toggle {
  border-color: var(--line);
  background: #fff;
}

.site-header.is-scrolled .menu-toggle span {
  background: var(--ink);
}

.hero {
  position: relative;
  min-height: 92vh;
  display: grid;
  align-items: center;
  overflow: hidden;
  color: #fff;
  isolation: isolate;
}

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

.hero-bg {
  object-fit: cover;
  z-index: -3;
}

.hero-overlay {
  z-index: -2;
  background:
    linear-gradient(180deg, rgba(9, 13, 29, .24), rgba(9, 13, 29, .2) 58%, rgba(255, 255, 255, .96) 100%),
    radial-gradient(circle at 22% 42%, rgba(66, 198, 255, .16), transparent 32%);
}

.hero-content {
  width: min(100% - 40px, var(--container));
  margin-inline: auto;
  padding: 136px 0 92px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 10px;
  color: var(--cyan);
  font-weight: 800;
  letter-spacing: 0;
}

.hero h1 {
  max-width: 800px;
  margin: 0;
  font-size: clamp(34px, 4.8vw, 60px);
  line-height: 1.08;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 680px;
  margin: 22px 0 0;
  color: rgba(255, 255, 255, .88);
  font-size: 19px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.primary-btn,
.secondary-btn,
.footer-btn {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border-radius: 8px;
  font-weight: 800;
  line-height: 1;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease, border-color .2s ease;
}

.primary-btn {
  color: #111827;
  background: linear-gradient(135deg, var(--gold), #fff17a);
  box-shadow: 0 16px 32px rgba(255, 201, 77, .28);
}

.secondary-btn {
  color: #fff;
  border: 1px solid rgba(255, 255, 255, .34);
  background: rgba(255, 255, 255, .1);
}

.primary-btn:hover,
.secondary-btn:hover,
.footer-btn:hover {
  transform: translateY(-3px);
}

.primary-btn:hover {
  box-shadow: 0 20px 42px rgba(255, 201, 77, .36);
}

.secondary-btn:hover {
  border-color: rgba(255, 255, 255, .62);
  background: rgba(255, 255, 255, .18);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 150px));
  gap: 12px;
  max-width: 520px;
  margin: 42px 0 0;
}

.hero-stats div {
  position: relative;
  overflow: hidden;
  padding: 14px 16px;
  border: 1px solid rgba(255, 255, 255, .16);
  border-radius: 8px;
  background: rgba(255, 255, 255, .1);
  backdrop-filter: blur(12px);
  transition: transform .22s ease, border-color .22s ease, background .22s ease;
}

.hero-stats div::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, .18), transparent 56%);
  opacity: 0;
  transition: opacity .22s ease;
}

.hero-stats div:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 255, 255, .38);
  background: rgba(255, 255, 255, .16);
}

.hero-stats div:hover::before {
  opacity: 1;
}

.hero-stats dt {
  font-size: 22px;
  font-weight: 900;
  line-height: 1.2;
}

.hero-stats dd {
  margin: 4px 0 0;
  color: rgba(255, 255, 255, .72);
  font-size: 13px;
}

.section {
  padding: 92px 0;
}

.intro-band {
  padding: 46px 0;
  background: #fff;
}

.intro-grid,
.guide-grid,
.faq-layout,
.two-col {
  display: grid;
  grid-template-columns: minmax(0, .78fr) minmax(0, 1.22fr);
  gap: 54px;
  align-items: start;
}

.intro-grid p:last-child,
.section-heading p,
.guide-list p,
.timeline-item p,
.feature-card p,
.work-card p,
.faq-list p,
.site-footer p {
  color: var(--muted);
}

.section-heading {
  max-width: 760px;
  margin: 0 auto 44px;
  text-align: center;
}

.section-heading.align-left {
  margin: 0;
  text-align: left;
}

h2 {
  margin: 0;
  font-size: clamp(26px, 3vw, 38px);
  line-height: 1.22;
  letter-spacing: 0;
}

h3 {
  margin: 0;
  color: #096dca;
  font-size: 22px;
  line-height: 1.35;
  letter-spacing: 0;
}

.section-heading p {
  margin: 16px 0 0;
  font-size: 17px;
}

.timeline {
  display: grid;
  gap: 16px;
}

.growth-timeline,
.guide-cards {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
}

.timeline-item,
.feature-card,
.work-card,
.guide-list article,
.faq-list details {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  box-shadow: 0 10px 30px rgba(23, 32, 51, .06);
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}

.timeline-item {
  position: relative;
  padding: 28px 28px 26px 86px;
}

.timeline-item:hover,
.feature-card:hover,
.guide-list article:hover,
.faq-list details:hover {
  transform: translateY(-5px);
  border-color: rgba(11, 116, 222, .22);
  box-shadow: 0 22px 54px rgba(23, 32, 51, .12);
}

.timeline-item:hover .step {
  transform: scale(1.06);
}

.step {
  position: absolute;
  left: 26px;
  top: 28px;
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  color: #fff;
  background: linear-gradient(135deg, var(--blue), var(--rose));
  border-radius: 8px;
  font-weight: 900;
  font-size: 14px;
  transition: transform .22s ease;
}

.timeline-item p,
.feature-card p,
.work-card p,
.guide-list p {
  margin: 14px 0 0;
}

.feature-section,
.faq-section {
  background: var(--soft);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
}

.feature-card {
  min-height: 292px;
  padding: 34px;
  overflow: hidden;
}

.feature-icon {
  width: 54px;
  height: 54px;
  display: inline-block;
  margin-bottom: 30px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--cyan), var(--rose));
  position: relative;
  box-shadow: 0 14px 30px rgba(66, 198, 255, .18);
  transition: transform .22s ease, box-shadow .22s ease;
}

.feature-card:hover .feature-icon {
  transform: translateY(-3px) rotate(-2deg);
  box-shadow: 0 18px 40px rgba(255, 122, 170, .22);
}

.feature-icon::before,
.feature-icon::after {
  content: "";
  position: absolute;
  background: #fff;
}

.icon-game::before {
  width: 28px;
  height: 18px;
  left: 13px;
  top: 18px;
  border-radius: 10px 10px 7px 7px;
}

.icon-game::after {
  width: 5px;
  height: 5px;
  left: 21px;
  top: 24px;
  box-shadow: 9px 0 0 #fff, 18px -4px 0 #fff, 18px 5px 0 #fff;
  border-radius: 50%;
}

.icon-map::before {
  width: 30px;
  height: 30px;
  left: 12px;
  top: 12px;
  border-radius: 50%;
  background: transparent;
  border: 6px solid #fff;
}

.icon-map::after {
  width: 8px;
  height: 18px;
  left: 24px;
  top: 18px;
  border-radius: 6px;
  transform: rotate(35deg);
}

.icon-spark::before {
  width: 8px;
  height: 34px;
  left: 23px;
  top: 10px;
  border-radius: 8px;
}

.icon-spark::after {
  width: 34px;
  height: 8px;
  left: 10px;
  top: 23px;
  border-radius: 8px;
}

.icon-search::before {
  width: 22px;
  height: 22px;
  left: 12px;
  top: 11px;
  border-radius: 50%;
  background: transparent;
  border: 6px solid #fff;
}

.icon-search::after {
  width: 18px;
  height: 6px;
  left: 31px;
  top: 33px;
  border-radius: 4px;
  transform: rotate(45deg);
}

.icon-speed::before {
  width: 30px;
  height: 20px;
  left: 12px;
  top: 17px;
  border-radius: 4px;
}

.icon-speed::after {
  width: 20px;
  height: 4px;
  left: 17px;
  top: 24px;
  background: var(--blue);
  box-shadow: 0 7px 0 var(--cyan);
}

.icon-community::before {
  width: 16px;
  height: 16px;
  left: 11px;
  top: 15px;
  border-radius: 50%;
  box-shadow: 17px 0 0 #fff;
}

.icon-community::after {
  width: 38px;
  height: 16px;
  left: 8px;
  top: 31px;
  border-radius: 14px 14px 6px 6px;
}

.works-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
}

.work-card {
  overflow: hidden;
  transition: transform .2s ease, box-shadow .2s ease;
}

.work-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.work-card img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: #eef2f7;
  transition: transform .35s ease, filter .35s ease;
}

.work-card:hover img {
  transform: scale(1.045);
  filter: saturate(1.08) contrast(1.03);
}

.work-body {
  position: relative;
  z-index: 1;
  padding: 24px 24px 26px;
  background: #fff;
}

.rating {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  margin-top: 18px;
}

.rating span {
  color: #f7ad14;
  letter-spacing: 0;
  font-size: 18px;
}

.rating strong {
  color: var(--ink);
}

.rating small {
  color: #8b95a5;
}

.guide-section {
  background:
    linear-gradient(135deg, rgba(11, 116, 222, .08), transparent 42%),
    linear-gradient(315deg, rgba(255, 122, 170, .09), transparent 48%),
    #fff;
}

.guide-list {
  display: grid;
  gap: 16px;
}

.guide-list article {
  padding: 24px;
}

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

.faq-list details {
  padding: 0;
  overflow: hidden;
}

.faq-list summary {
  cursor: pointer;
  padding: 20px 24px;
  color: var(--ink);
  font-weight: 800;
  list-style: none;
  transition: color .2s ease, background .2s ease;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  content: "+";
  float: right;
  color: var(--blue);
  font-size: 24px;
  line-height: 1;
  transition: transform .2s ease;
}

.faq-list details[open] summary::after {
  content: "-";
}

.faq-list details:hover summary {
  color: var(--blue);
  background: #f8fbff;
}

.faq-list details:hover summary::after {
  transform: rotate(90deg);
}

.faq-list details[open]:hover summary::after {
  transform: none;
}

.faq-list p {
  margin: 0;
  padding: 0 24px 22px;
}

.site-footer {
  color: #d6deea;
  background: #101827;
  padding: 34px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-footer strong {
  color: #fff;
  font-size: 20px;
}

.site-footer p {
  margin: 4px 0 0;
  color: #a9b4c5;
}

.footer-btn {
  color: #101827;
  background: var(--gold);
}

.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 45;
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, .22);
  border-radius: 8px;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  box-shadow: 0 16px 36px rgba(11, 116, 222, .28);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(14px);
  transition: opacity .22s ease, visibility .22s ease, transform .22s ease, box-shadow .22s ease;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 22px 46px rgba(11, 116, 222, .36);
}

.back-to-top span {
  width: 14px;
  height: 14px;
  border-left: 3px solid #fff;
  border-top: 3px solid #fff;
  transform: translateY(3px) rotate(45deg);
}

.reveal {
  opacity: 1;
  transform: none;
  transition: box-shadow .2s ease, transform .2s ease;
}

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

@media (max-width: 980px) {
  .menu-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    left: 20px;
    right: 20px;
    top: 76px;
    display: none;
    padding: 10px;
    background: rgba(255, 255, 255, .98);
    border: 1px solid var(--line);
    border-radius: 8px;
    box-shadow: var(--shadow);
  }

  .site-nav.is-open {
    display: grid;
  }

  .site-nav a,
  .site-header .site-nav a {
    color: var(--ink);
  }

  .site-nav a:hover,
  .site-nav a.is-active {
    color: var(--blue);
    background: #edf6ff;
  }

  .hero {
    min-height: 88vh;
  }

  .hero-content {
    padding-top: 124px;
  }

  .intro-grid,
  .guide-grid,
  .faq-layout,
  .two-col {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .feature-grid,
  .works-grid,
  .growth-timeline,
  .guide-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .container,
  .nav-wrap,
  .hero-content {
    width: min(100% - 28px, var(--container));
  }

  .nav-wrap {
    min-height: 64px;
  }

  .brand span {
    font-size: 16px;
  }

  .hero {
    min-height: 86vh;
  }

  .hero-content {
    padding: 104px 0 64px;
  }

  .hero h1 {
    font-size: 34px;
  }

  .hero-copy {
    font-size: 16px;
  }

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

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

  .section {
    padding: 64px 0;
  }

  .intro-band {
    padding: 36px 0;
  }

  .feature-grid,
  .works-grid,
  .growth-timeline,
  .guide-cards {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .feature-card {
    min-height: auto;
    padding: 28px;
  }

  .timeline-item {
    padding: 82px 22px 24px;
  }

  .step {
    left: 22px;
    top: 24px;
  }

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

  .footer-btn {
    width: 100%;
  }

  .back-to-top {
    right: 16px;
    bottom: 16px;
    width: 44px;
    height: 44px;
  }
}

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