:root {
  color-scheme: dark;
  --bg: #0b0c0e;
  --surface: #111316;
  --surface-2: #17191d;
  --text: #f4f3ef;
  --muted: #a2a4aa;
  --line: #2a2d32;
  --accent: #ff5a24;
  --accent-soft: #d94a1c;
  --radius: 0px;
  --max: 1440px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "SF Pro Display", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; }
img { display: block; max-width: 100%; }

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  transform: translateY(-140%);
  padding: 10px 14px;
  background: var(--text);
  color: var(--bg);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  padding: 0 max(24px, calc((100vw - var(--max)) / 2));
  border-bottom: 1px solid transparent;
  background: rgba(11, 12, 14, 0.18);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: background 280ms ease, border-color 280ms ease;
}
.site-header.is-scrolled {
  background: rgba(11, 12, 14, 0.88);
  border-color: var(--line);
}
.brand { display: inline-flex; align-items: baseline; gap: 12px; }
.brand-cn { font-size: 18px; font-weight: 800; letter-spacing: 0.08em; }
.brand-en { color: var(--muted); font-size: 11px; letter-spacing: 0.18em; }
.nav-links { display: flex; align-items: center; gap: 30px; font-size: 14px; }
.nav-links > a:not(.nav-cta) { color: #d2d3d5; transition: color 180ms ease; }
.nav-links > a:not(.nav-cta):hover { color: var(--text); }
.nav-cta {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 0 18px;
  background: var(--accent);
  color: #170905;
  font-weight: 750;
}
.menu-button, .mobile-menu { display: none; }

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(480px, 1.1fr);
  align-items: start;
  min-height: 100dvh;
  max-width: var(--max);
  margin: 0 auto;
  padding: 104px 24px 52px;
  gap: clamp(36px, 6vw, 100px);
}
.hero::before {
  content: "";
  position: absolute;
  left: -16vw;
  bottom: -26vh;
  width: 68vw;
  height: 56vh;
  background: radial-gradient(ellipse, rgba(255, 90, 36, 0.18), transparent 68%);
  pointer-events: none;
}
.hero-copy { position: relative; z-index: 2; }
.hero-copy { padding-top: clamp(92px, 11vh, 132px); }
.hero-kicker {
  margin: 0 0 24px;
  color: var(--accent);
  font-size: 12px;
  font-weight: 750;
  letter-spacing: 0.16em;
}
h1, h2, h3, p { margin-top: 0; }
h1 {
  margin-bottom: 26px;
  font-size: clamp(54px, 6.4vw, 104px);
  line-height: 0.98;
  letter-spacing: -0.065em;
  font-weight: 900;
}
h1 em { color: var(--accent); font-style: normal; }
.hero-description {
  max-width: 520px;
  margin-bottom: 34px;
  color: #c5c6c9;
  font-size: clamp(17px, 1.5vw, 21px);
  line-height: 1.7;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 22px;
  border: 1px solid var(--line);
  font-weight: 720;
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease;
}
.button:hover { transform: translateY(-2px); }
.button:active { transform: translateY(1px); }
.button-primary { border-color: var(--accent); background: var(--accent); color: #170905; }
.button-secondary:hover { border-color: #666970; background: #15171a; }
.hero-visual {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid #282b30;
  background: #0f1012;
  box-shadow: 0 36px 90px rgba(0, 0, 0, 0.42);
  transform: perspective(1400px) rotateY(-5deg) rotateX(1deg);
  margin-top: 30px;
}
.hero-visual img { width: 100%; height: auto; aspect-ratio: 16 / 9; object-fit: cover; }
.visual-sheen {
  position: absolute;
  inset: 0;
  background: linear-gradient(112deg, transparent 30%, rgba(255,255,255,0.12) 48%, transparent 63%);
  transform: translateX(-120%);
  animation: sheen 6s 1.2s cubic-bezier(.16,1,.3,1) infinite;
  pointer-events: none;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  max-width: var(--max);
  margin: 0 auto;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.metric { min-height: 190px; padding: 42px 32px; border-right: 1px solid var(--line); }
.metric:last-child { border-right: 0; }
.metric strong { display: block; color: var(--accent); font-size: clamp(44px, 5vw, 76px); line-height: 1; letter-spacing: -0.045em; }
.metric span { display: block; margin-top: 18px; color: var(--muted); font-size: 14px; }

.section { max-width: var(--max); margin: 0 auto; padding: clamp(100px, 12vw, 176px) 24px; }
.section h2 { margin-bottom: 24px; font-size: clamp(42px, 5.6vw, 84px); line-height: 1.05; letter-spacing: -0.055em; }
.section-copy { max-width: 860px; }
.section-copy > p, .capabilities-heading > p, .work-heading > p, .contact-copy > p {
  max-width: 620px;
  color: var(--muted);
  font-size: clamp(17px, 1.5vw, 21px);
}
.audience-map {
  display: grid;
  grid-template-columns: 0.8fr 1.1fr 0.25fr 0.8fr 1.1fr;
  align-items: center;
  margin-top: 92px;
  padding: 48px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.audience-number { color: var(--accent); font-size: clamp(54px, 7vw, 104px); font-weight: 900; letter-spacing: -0.06em; line-height: 1; }
.audience-number-light { color: var(--text); }
.audience-copy { padding: 0 24px; }
.audience-copy strong { font-size: 20px; }
.audience-copy p { margin: 8px 0 0; color: var(--muted); }
.audience-flow { display: flex; align-items: center; justify-content: center; height: 100%; }
.audience-flow span { width: 1px; height: 112px; background: var(--line); }

.capabilities { display: grid; grid-template-columns: 0.75fr 1.25fr; gap: clamp(50px, 8vw, 128px); }
.capabilities-heading { position: sticky; top: 120px; align-self: start; }
.capabilities-heading h2 { max-width: 560px; }
.capability-stage { border-top: 1px solid var(--line); }
.capability {
  display: grid;
  grid-template-columns: 70px 1fr;
  gap: 22px;
  min-height: 150px;
  padding: 34px 18px 34px 0;
  border-bottom: 1px solid var(--line);
  transition: color 220ms ease, transform 220ms ease, background 220ms ease;
}
.capability:hover { transform: translateX(10px); background: linear-gradient(90deg, rgba(255,90,36,0.08), transparent 70%); }
.capability-featured { min-height: 220px; }
.capability-index { color: var(--accent); font-size: 14px; font-weight: 750; }
.capability h3 { margin-bottom: 9px; font-size: clamp(28px, 3.3vw, 52px); line-height: 1.08; }
.capability p { margin-bottom: 0; color: var(--muted); }

.work { padding-top: 80px; }
.work-heading { margin-bottom: 68px; }
.work-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 18px; }
.case {
  position: relative;
  min-height: 520px;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--surface);
  padding: clamp(28px, 4vw, 58px);
  isolation: isolate;
}
.case::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: auto -20% -42% 16%;
  height: 75%;
  background: radial-gradient(ellipse, rgba(255,90,36,0.2), transparent 65%);
  transition: transform 500ms cubic-bezier(.16,1,.3,1);
}
.case:hover::before { transform: translateY(-12%); }
.case-ubras { grid-column: span 7; }
.case-wudao { grid-column: span 5; background: #15171a; }
.case-movefree { grid-column: span 5; background: #131416; }
.case-maia { grid-column: span 7; }
.case-brand { font-size: clamp(35px, 5vw, 72px); font-weight: 900; letter-spacing: -0.05em; }
.case-result { margin-top: 42px; }
.case-result strong { display: block; color: var(--accent); font-size: clamp(42px, 5vw, 76px); letter-spacing: -0.055em; line-height: 1; }
.case-result span { color: var(--muted); font-size: 14px; }
.case-copy { position: absolute; right: clamp(28px, 4vw, 58px); bottom: clamp(28px, 4vw, 58px); left: clamp(28px, 4vw, 58px); }
.case-copy h3 { max-width: 560px; margin-bottom: 12px; font-size: clamp(24px, 2.5vw, 38px); line-height: 1.2; }
.case-copy p { max-width: 520px; margin-bottom: 18px; color: #c4c5c8; }
.case-copy > span { color: var(--muted); font-size: 13px; }

.contact {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: end;
  gap: clamp(48px, 8vw, 120px);
  min-height: 78dvh;
}
.contact-copy h2 { max-width: 820px; }
.contact-links { border-top: 1px solid var(--line); }
.contact-links a, .contact-links button {
  display: block;
  width: 100%;
  padding: 26px 0;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  text-align: left;
  cursor: pointer;
}
.contact-links span, .contact-links small { display: block; color: var(--muted); font-size: 13px; }
.contact-links strong { display: block; margin-top: 7px; font-size: clamp(20px, 2vw, 30px); }
.contact-links small { margin-top: 6px; color: var(--accent); }

footer {
  display: flex;
  justify-content: space-between;
  max-width: var(--max);
  margin: 0 auto;
  padding: 28px 24px 38px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 12px;
}

.reveal { opacity: 0; transform: translateY(26px); transition: opacity 700ms cubic-bezier(.16,1,.3,1), transform 700ms cubic-bezier(.16,1,.3,1); }
.reveal.is-visible { opacity: 1; transform: translateY(0); }

@keyframes sheen { 0%, 62% { transform: translateX(-120%); } 82%, 100% { transform: translateX(120%); } }

@media (max-width: 900px) {
  .nav-links { display: none; }
  .menu-button {
    display: grid;
    gap: 6px;
    width: 44px;
    height: 44px;
    place-content: center;
    border: 1px solid var(--line);
    background: var(--surface);
    color: var(--text);
  }
  .menu-button span { display: block; width: 20px; height: 1px; background: currentColor; }
  .mobile-menu {
    position: fixed;
    z-index: 19;
    inset: 72px 0 auto 0;
    display: grid;
    padding: 24px;
    border-bottom: 1px solid var(--line);
    background: rgba(11,12,14,0.98);
  }
  .mobile-menu[hidden] { display: none; }
  .mobile-menu a { padding: 14px 0; border-bottom: 1px solid var(--line); }
  .hero { grid-template-columns: 1fr; padding-top: 124px; gap: 48px; }
  .hero-copy { padding-top: 26px; }
  .hero-visual { margin-top: 0; }
  .hero-visual { transform: none; }
  .metrics { grid-template-columns: repeat(2, 1fr); margin: 0 20px; }
  .metric:nth-child(2) { border-right: 0; }
  .metric:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .audience-map { grid-template-columns: 1fr 1.4fr; gap: 28px; }
  .audience-flow { display: none; }
  .capabilities { grid-template-columns: 1fr; }
  .capabilities-heading { position: static; }
  .contact { grid-template-columns: 1fr; align-items: center; }
}

@media (max-width: 640px) {
  .site-header { padding-inline: 18px; }
  .brand-en { display: none; }
  .hero { min-height: auto; padding: 116px 18px 68px; }
  h1 { font-size: clamp(50px, 15vw, 72px); }
  .hero-description { font-size: 17px; }
  .hero-actions { display: grid; grid-template-columns: 1fr 1fr; }
  .metrics { margin-inline: 18px; }
  .metric { min-height: 150px; padding: 28px 18px; }
  .metric strong { font-size: 44px; }
  .section { padding: 92px 18px; }
  .section h2 { font-size: 46px; }
  .audience-map { margin-top: 54px; grid-template-columns: 1fr; }
  .audience-copy { padding: 0 0 18px; border-bottom: 1px solid var(--line); }
  .audience-number-light { margin-top: 20px; }
  .capability { grid-template-columns: 46px 1fr; min-height: 130px; }
  .capability-featured { min-height: 160px; }
  .work-grid { display: flex; overflow-x: auto; scroll-snap-type: x mandatory; margin-inline: -18px; padding: 0 18px 12px; }
  .case { flex: 0 0 min(86vw, 410px); min-height: 500px; scroll-snap-align: start; }
  .contact { min-height: auto; }
  footer { flex-direction: column; gap: 8px; padding-inline: 18px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  .reveal { opacity: 1; transform: none; }
  .hero-visual { transform: none; }
}

@media (prefers-reduced-transparency: reduce) {
  .site-header { background: var(--bg); backdrop-filter: none; -webkit-backdrop-filter: none; }
}