:root {
  color-scheme: dark;
  --bg: #08090c;
  --bg-soft: #101116;
  --surface: #15171d;
  --surface-2: #1c1f27;
  --line: rgba(255, 255, 255, 0.12);
  --line-strong: rgba(255, 255, 255, 0.22);
  --text: #f4f1eb;
  --muted: #a3a4aa;
  --coral: #ff536f;
  --coral-deep: #d83452;
  --gold: #e9bd62;
  --cyan: #48d8d2;
  --violet: #9a82ef;
  --max: 1220px;
  --header-h: 72px;
  --radius: 8px;
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", system-ui, sans-serif;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 18px);
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  background: var(--bg);
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: 0;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 150;
  pointer-events: none;
  background:
    linear-gradient(180deg, rgba(233, 189, 98, 0.08), transparent 26%, rgba(72, 216, 210, 0.035) 62%, rgba(255, 83, 111, 0.07)),
    linear-gradient(90deg, rgba(255, 83, 111, 0.035), transparent 32%, transparent 68%, rgba(233, 189, 98, 0.045));
  opacity: 0.2;
  transform: translateZ(0);
  backface-visibility: hidden;
  will-change: opacity;
  animation: ambient-breathe 9s cubic-bezier(0.45, 0, 0.55, 1) infinite;
}

@keyframes ambient-breathe {
  0%, 100% { opacity: 0.14; }
  50% { opacity: 0.44; }
}

body.nav-open { overflow: hidden; }

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button, input { font: inherit; letter-spacing: 0; }
button { color: inherit; }

::selection { color: #101014; background: var(--gold); }

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 200;
  padding: 10px 14px;
  color: #111;
  background: #fff;
  transform: translateY(-150%);
}

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

.section-shell, .nav-shell, .hero-inner {
  width: min(calc(100% - 48px), var(--max));
  margin-inline: auto;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: var(--header-h);
  border-bottom: 1px solid transparent;
  background: rgba(8, 9, 12, 0.55);
  backdrop-filter: blur(16px);
  transition: background 180ms ease, border-color 180ms ease;
}

.site-header.scrolled {
  border-bottom-color: var(--line);
  background: rgba(8, 9, 12, 0.92);
}

.nav-shell {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-size: 18px;
  font-weight: 700;
  white-space: nowrap;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  color: #1a1510;
  background: var(--gold);
  border-radius: 50%;
  box-shadow: 0 0 24px rgba(233, 189, 98, 0.28);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
  color: #c6c6ca;
  font-size: 14px;
}

.site-nav > a:not(.nav-cta) {
  position: relative;
  padding-block: 10px;
}

.site-nav > a:not(.nav-cta)::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 4px;
  left: 0;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 180ms ease;
}

.site-nav > a:hover { color: #fff; }
.site-nav > a:hover::after { transform: scaleX(1); transform-origin: left; }

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 40px;
  padding: 8px 16px;
  color: #0d0d0f;
  font-weight: 700;
  background: var(--gold);
  border: 1px solid var(--gold);
  border-radius: 4px;
}

.nav-cta:hover { background: #f3cd7d; }
.menu-toggle { display: none; }

.hero {
  position: relative;
  height: max(640px, min(860px, calc(100svh - 28px)));
  min-height: 0;
  padding-top: var(--header-h);
  overflow: hidden;
  isolation: isolate;
  background:
    linear-gradient(90deg, rgba(8, 9, 12, 0.92) 0%, rgba(8, 9, 12, 0.62) 47%, rgba(8, 9, 12, 0.2) 100%),
    linear-gradient(180deg, #08090c 0%, #0c0d12 58%, #08090c 100%);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -4;
  opacity: 0.8;
  background-image:
    radial-gradient(circle at 12% 18%, #fff 0 1px, transparent 1.6px),
    radial-gradient(circle at 28% 66%, rgba(255, 255, 255, 0.85) 0 1px, transparent 1.7px),
    radial-gradient(circle at 46% 31%, rgba(233, 189, 98, 0.9) 0 1px, transparent 1.6px),
    radial-gradient(circle at 70% 14%, #fff 0 1.2px, transparent 1.8px),
    radial-gradient(circle at 84% 52%, rgba(255, 255, 255, 0.9) 0 1px, transparent 1.8px),
    radial-gradient(circle at 94% 25%, rgba(72, 216, 210, 0.7) 0 1px, transparent 1.8px);
  background-size: 240px 240px, 300px 300px, 370px 370px, 290px 290px, 420px 420px, 260px 260px;
}

.hero::after {
  content: "";
  position: absolute;
  right: 8%;
  bottom: -180px;
  z-index: -3;
  width: 680px;
  height: 360px;
  border-top: 1px solid rgba(233, 189, 98, 0.28);
  border-radius: 50%;
  box-shadow: 0 -30px 80px rgba(255, 83, 111, 0.07);
  transform: rotate(-8deg);
}

.hero-stars {
  position: absolute;
  top: 18%;
  right: 7%;
  z-index: -1;
  width: 1px;
  height: 1px;
  background: #fff;
  box-shadow: 80px 20px #fff, 160px 90px #e9bd62, 220px -35px #fff, 300px 60px #fff, 410px 8px #48d8d2, 490px 120px #fff, -30px 150px #fff, 120px 210px #fff, 370px 260px #e9bd62;
  animation: star-pulse 4s ease-in-out infinite alternate;
}

.hero-orbit {
  position: absolute;
  z-index: -2;
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: 50%;
  pointer-events: none;
}

.hero-orbit-one { width: 820px; height: 300px; right: -110px; top: 31%; transform: rotate(-12deg); }
.hero-orbit-two { width: 620px; height: 210px; right: 5%; top: 45%; border-color: rgba(233, 189, 98, 0.13); transform: rotate(9deg); }

@keyframes star-pulse { from { opacity: 0.45; } to { opacity: 1; } }

.hero-inner {
  min-height: calc(100% - var(--header-h));
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(380px, 0.8fr);
  align-items: center;
  gap: 72px;
  padding-block: 48px 72px;
}

.hero-copy { position: relative; z-index: 4; max-width: 690px; }

.eyebrow, .kicker {
  margin: 0 0 16px;
  color: var(--gold);
  font-size: 12px;
  font-weight: 800;
  line-height: 1.4;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.eyebrow { display: flex; align-items: center; gap: 10px; font-size: 13px; letter-spacing: 0.12em; }
.eyebrow span { width: 32px; height: 1px; background: var(--gold); }

.hero h1 {
  display: inline-block;
  margin: 0;
  color: #f6c75e;
  font-family: "STXingkai", "FZShuTi", "STKaiti", "KaiTi", serif;
  font-size: clamp(68px, 8rem, 128px);
  font-weight: 700;
  line-height: 0.96;
  -webkit-text-stroke: 0.6px rgba(255, 236, 178, 0.5);
  transform-origin: center bottom;
  text-shadow: 0 3px 0 rgba(102, 64, 20, 0.32), 0 0 24px rgba(233, 189, 98, 0.34), 0 0 62px rgba(255, 83, 111, 0.12);
  transform: translate3d(0, 0, 0);
  backface-visibility: hidden;
  will-change: transform;
  animation: title-breathe 6s cubic-bezier(0.45, 0, 0.55, 1) infinite;
}

@keyframes title-breathe {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  50% { transform: translate3d(0, -2px, 0) scale(1.008); }
}

.hero-lead {
  max-width: 630px;
  margin: 30px 0 12px;
  color: #f0edf0;
  font-size: 24px;
  font-weight: 600;
  line-height: 1.55;
}

.hero-note { max-width: 590px; margin: 0; color: var(--muted); font-size: 16px; }

.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 50px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: 4px;
  font-size: 15px;
  font-weight: 700;
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease;
}

.button:hover { transform: translateY(-2px); }
.button-primary { color: #18130e; background: var(--gold); }
.button-primary:hover { background: #f2cc7b; }
.button-secondary { border-color: var(--line-strong); background: rgba(255, 255, 255, 0.04); }
.button-secondary:hover { border-color: rgba(255, 255, 255, 0.45); background: rgba(255, 255, 255, 0.08); }

.hero-proof { display: flex; gap: 0; margin-top: 42px; color: #b7b6ba; font-size: 12px; }
.hero-proof span { padding: 0 16px; border-left: 1px solid var(--line-strong); }
.hero-proof span:first-child { padding-left: 0; border-left: 0; }

.hero-product { position: relative; align-self: end; justify-self: center; width: min(100%, 430px); height: calc(min(900px, 100svh) - 105px); max-height: 790px; min-height: 610px; }

.phone-glow {
  position: absolute;
  inset: 16% -14% 8%;
  z-index: -1;
  border: 1px solid rgba(233, 189, 98, 0.12);
  border-radius: 50%;
  box-shadow: 0 0 90px rgba(233, 189, 98, 0.09), inset 0 0 60px rgba(255, 83, 111, 0.06);
}

.phone-frame {
  position: absolute;
  right: 20px;
  bottom: -85px;
  width: min(85%, 355px);
  margin: 0;
  padding: 7px;
  border: 1px solid rgba(255, 255, 255, 0.26);
  border-radius: 38px 38px 0 0;
  background: #08090c;
  box-shadow: 0 35px 100px rgba(0, 0, 0, 0.55), 0 0 0 8px rgba(255, 255, 255, 0.025);
  overflow: hidden;
}

.phone-frame img { width: 100%; border-radius: 31px 31px 0 0; }
.phone-speaker { position: absolute; top: 16px; left: 50%; z-index: 2; width: 80px; height: 18px; border-radius: 20px; background: #06070a; transform: translateX(-50%); }

.floating-stat {
  position: absolute;
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 154px;
  padding: 11px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  background: rgba(20, 21, 26, 0.88);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.32);
  backdrop-filter: blur(12px);
}

.floating-stat span:last-child { display: flex; flex-direction: column; line-height: 1.35; }
.floating-stat strong { font-size: 13px; }
.floating-stat small { color: var(--muted); font-size: 11px; }
.floating-stat-gift { top: 31%; left: -24px; }
.floating-stat-rank { right: -22px; bottom: 22%; }
.floating-icon { display: grid; place-items: center; width: 34px; height: 34px; color: #fff; border-radius: 50%; background: var(--coral); font-size: 16px; font-style: normal; }
.floating-icon.gold { color: #1c150c; background: var(--gold); }

.scroll-cue {
  position: absolute;
  left: 50%;
  bottom: 18px;
  z-index: 5;
  display: grid;
  place-items: center;
  width: 30px;
  height: 50px;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 20px;
  transform: translateX(-50%);
}

.scroll-cue span { width: 3px; height: 9px; border-radius: 4px; background: var(--gold); animation: scroll-dot 1.7s ease-in-out infinite; }
@keyframes scroll-dot { 0% { transform: translateY(-8px); opacity: 0; } 40% { opacity: 1; } 100% { transform: translateY(8px); opacity: 0; } }

.section { padding: 112px 0; }
.intro-section { border-top: 1px solid var(--line); background: #0d0e12; }
.intro-grid { display: grid; grid-template-columns: 0.82fr 1.18fr; gap: 110px; }
.section-heading h2, .heading-row h2, .gallery-copy h2, .download-copy h2, .faq-layout h2, .contact-inner h2 {
  margin: 0;
  color: #f2efe8;
  font-size: 46px;
  font-weight: 650;
  line-height: 1.24;
}

.intro-copy { padding-top: 34px; color: #aaaab0; }
.intro-copy p { margin: 0 0 20px; }
.intro-copy .intro-large { color: #eeeaf0; font-size: 24px; line-height: 1.62; }
.intro-line { display: grid; grid-template-columns: 58px 1fr; gap: 18px; align-items: start; margin-top: 36px; color: #d8d3ca; }
.intro-line span { height: 1px; margin-top: 13px; background: var(--gold); }
.intro-line strong { font-weight: 600; }

.features-section { background: var(--bg); }
.heading-row { display: flex; align-items: end; justify-content: space-between; gap: 48px; margin-bottom: 54px; }
.heading-row > p { max-width: 490px; margin: 0; color: var(--muted); }

.feature-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.feature-item { position: relative; min-height: 320px; padding: 30px 26px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: #0d0e12; transition: background 180ms ease; }
.feature-item:hover { background: #15171d; }
.feature-wide { grid-column: span 2; }
.feature-index { color: #73747a; font-size: 11px; font-weight: 800; }
.feature-icon { display: grid; place-items: center; width: 72px; height: 72px; margin: 42px 0 20px; background: transparent; }
.feature-icon img { width: 100%; height: 100%; object-fit: contain; filter: drop-shadow(0 10px 18px rgba(0, 0, 0, 0.34)); }
.feature-item h3 { margin: 0 0 10px; font-size: 20px; }
.feature-item p { max-width: 470px; margin: 0; color: var(--muted); font-size: 14px; }

.demo-section { position: relative; overflow: hidden; border-block: 1px solid var(--line); background: #101116; }
.demo-section::before { content: ""; position: absolute; inset: 0; opacity: 0.32; pointer-events: none; background-image: linear-gradient(rgba(255,255,255,.025) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.025) 1px, transparent 1px); background-size: 48px 48px; }
.demo-section .section-shell { position: relative; }
.video-showcase {
  display: grid;
  grid-template-columns: minmax(320px, 0.82fr) minmax(440px, 1.18fr);
  min-height: 820px;
  border-block: 1px solid var(--line);
}

.video-copy {
  align-self: center;
  max-width: 510px;
  padding: 80px 64px 80px 0;
}

.video-index {
  display: block;
  margin-bottom: 28px;
  color: var(--gold);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.video-copy h3 {
  margin: 0;
  color: #f2efe8;
  font-size: 44px;
  line-height: 1.25;
}

.video-copy > p {
  margin: 26px 0 34px;
  color: var(--muted);
}

.video-points {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.video-points li {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 12px;
  padding: 15px 0;
  color: #d6d3ce;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
}

.video-points span { color: var(--gold); font-size: 10px; font-weight: 800; }

.video-device-wrap {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 820px;
  overflow: hidden;
  isolation: isolate;
}

.video-device-wrap::before {
  content: "";
  position: absolute;
  inset: 12% 2% 8%;
  z-index: -3;
  border: 1px solid rgba(233, 189, 98, 0.12);
  border-radius: 50%;
  box-shadow: inset 0 0 80px rgba(255, 83, 111, 0.05), 0 0 90px rgba(233, 189, 98, 0.05);
}

.video-device-wrap::after {
  content: "";
  position: absolute;
  right: 9%;
  bottom: 7%;
  left: 9%;
  z-index: -2;
  height: 80px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.5);
  filter: blur(22px);
}

.video-orbit {
  position: absolute;
  z-index: -2;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 50%;
}

.video-orbit-one { width: 700px; height: 250px; transform: rotate(-12deg); }
.video-orbit-two { width: 510px; height: 180px; border-color: rgba(72, 216, 210, 0.13); transform: rotate(14deg); }

.video-phone {
  position: relative;
  width: min(74%, 370px);
  padding: 10px;
  border: 1px solid rgba(255, 255, 255, 0.34);
  border-radius: 52px;
  background: linear-gradient(145deg, #2a2b31, #090a0d 28%, #050608 72%, #2a2b31);
  box-shadow: 0 34px 90px rgba(0, 0, 0, 0.66), 0 0 0 5px rgba(255, 255, 255, 0.025), inset 0 0 0 1px rgba(255, 255, 255, 0.08);
  transition: border-color 180ms ease, box-shadow 180ms ease;
}

.video-phone.playing {
  border-color: rgba(233, 189, 98, 0.65);
  box-shadow: 0 34px 90px rgba(0, 0, 0, 0.66), 0 0 42px rgba(233, 189, 98, 0.15), 0 0 0 5px rgba(255, 255, 255, 0.025);
}

.video-phone video {
  display: block;
  width: 100%;
  aspect-ratio: 720 / 1564;
  border-radius: 42px;
  background: #050609;
  object-fit: cover;
}

.video-speaker {
  position: absolute;
  top: 20px;
  left: 50%;
  z-index: 3;
  width: 92px;
  height: 24px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 18px;
  background: #050507;
  box-shadow: inset 0 2px 5px rgba(255, 255, 255, 0.03);
  pointer-events: none;
  transform: translateX(-50%);
}

.video-camera {
  position: absolute;
  top: 28px;
  left: calc(50% + 29px);
  z-index: 4;
  width: 7px;
  height: 7px;
  border: 1px solid #152132;
  border-radius: 50%;
  background: #070b11;
  pointer-events: none;
}

.video-side { position: absolute; width: 4px; border-radius: 4px 0 0 4px; background: #4b4c52; }
.video-side-volume { top: 122px; left: -5px; height: 72px; }
.video-side-power { top: 164px; right: -5px; height: 88px; border-radius: 0 4px 4px 0; }

.video-reflection {
  position: absolute;
  inset: 10px;
  z-index: 2;
  overflow: hidden;
  border-radius: 42px;
  pointer-events: none;
}

.video-reflection::before {
  content: "";
  position: absolute;
  top: -15%;
  left: -58%;
  width: 70%;
  height: 95%;
  background: linear-gradient(110deg, transparent, rgba(255, 255, 255, 0.08), transparent 66%);
  transform: rotate(7deg);
}

.gallery-section { overflow: hidden; background: #0d0e12; }
.gallery-layout { display: grid; grid-template-columns: .75fr 1.25fr; align-items: center; min-height: 820px; }
.gallery-copy { position: relative; z-index: 2; padding-right: 70px; }
.gallery-copy > p:not(.kicker) { max-width: 460px; margin: 24px 0 34px; color: var(--muted); }
.gallery-tabs { display: grid; grid-template-columns: 1fr 1fr; gap: 0; border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.gallery-tabs button { min-height: 48px; padding: 8px 12px; color: #939399; border: 0; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: transparent; cursor: pointer; text-align: left; font-size: 13px; }
.gallery-tabs button.active { color: #18130f; background: var(--gold); }
.gallery-viewer { position: relative; align-self: stretch; min-height: 820px; }
.gallery-backdrop { position: absolute; inset: 12% -40% 8% 0; border: 1px solid rgba(233,189,98,.12); border-radius: 50%; transform: rotate(-10deg); }
.gallery-backdrop::before, .gallery-backdrop::after { content: ""; position: absolute; border: 1px solid rgba(255,255,255,.08); border-radius: 50%; }
.gallery-backdrop::before { inset: 10% 3%; }
.gallery-backdrop::after { inset: 23% -4%; transform: rotate(12deg); }
.gallery-phone { position: absolute; bottom: -220px; left: 50%; z-index: 2; width: min(56%, 400px); margin: 0; padding: 7px; overflow: hidden; border: 1px solid rgba(255,255,255,.22); border-radius: 42px 42px 0 0; background: #07080b; box-shadow: 0 30px 90px #000; transform: translateX(-50%); }
.gallery-phone img { width: 100%; border-radius: 35px 35px 0 0; transition: opacity .42s ease, transform .42s ease; }
.gallery-phone img.changing { opacity: 0; transform: translateY(10px); }
.gallery-counter { position: absolute; right: 18px; bottom: 26px; color: #787980; font-size: 13px; }
.gallery-counter span { color: var(--gold); font-size: 26px; }

.extra-section { background: #08090c; }
.extra-list { border-top: 1px solid var(--line); }
.extra-list article { display: grid; grid-template-columns: 90px 270px 1fr; gap: 22px; align-items: start; padding: 34px 0; border-bottom: 1px solid var(--line); }
.extra-list article > span { color: var(--gold); font-size: 12px; font-weight: 800; }
.extra-list h3 { margin: 0; font-size: 21px; }
.extra-list p { max-width: 620px; margin: 0; color: var(--muted); }

.download-section { border-top: 1px solid var(--line); background: #0b0c10; }
.download-layout { display: grid; grid-template-columns: .82fr 1.18fr; gap: 100px; align-items: center; }
.download-copy > p:not(.kicker) { max-width: 520px; margin: 24px 0 0; color: var(--muted); }
.download-copy > p + p { margin-top: 12px; }
.invite-panel { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 6px 18px; margin-top: 34px; padding: 16px 0; border-block: 1px solid var(--line-strong); }
.invite-panel > span { display: flex; flex-direction: column; line-height: 1.4; }
.invite-panel small { color: #7f8086; font-size: 10px; font-weight: 800; }
.invite-panel strong { color: var(--gold); font-size: 23px; font-weight: 750; }
.invite-panel button { display: inline-flex; align-items: center; justify-content: center; gap: 7px; min-width: 88px; min-height: 42px; padding: 8px 13px; color: #17120c; border: 0; border-radius: 4px; background: var(--gold); cursor: pointer; font-size: 13px; font-weight: 800; }
.invite-panel button:hover { background: #f3cd7d; }
.invite-panel button.copied { background: var(--cyan); }
.invite-panel > p { grid-column: 1 / -1; min-height: 18px; margin: 0; color: var(--cyan); font-size: 11px; }
.download-options { border-top: 1px solid var(--line-strong); }
.download-link { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 20px; min-height: 116px; padding: 18px 8px; border-bottom: 1px solid var(--line-strong); transition: padding .18s, color .18s, background .18s; }
.download-link:hover { padding-inline: 18px; background: rgba(255,255,255,.025); }
.download-icon { display: grid; place-items: center; width: 50px; height: 50px; color: #15110b; border-radius: 50%; background: var(--gold); font-size: 24px; font-weight: 800; }
.download-android .download-icon { color: #071514; background: var(--cyan); }
.download-link > span:nth-child(2) { display: flex; min-width: 0; flex-direction: column; line-height: 1.45; }
.download-link small { color: #7c7d83; font-size: 10px; font-weight: 800; }
.download-link strong { color: #f2efe8; font-size: 19px; }
.download-link em { color: var(--muted); font-size: 12px; font-style: normal; }
.download-link b { color: var(--gold); font-size: 24px; font-weight: 400; }
.download-android b { color: var(--cyan); }

.faq-section { border-top: 1px solid var(--line); background: #101116; }
.faq-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: 100px; }
.faq-list { border-top: 1px solid var(--line-strong); }
.faq-list details { border-bottom: 1px solid var(--line-strong); }
.faq-list summary { display: flex; justify-content: space-between; gap: 20px; padding: 24px 0; cursor: pointer; list-style: none; font-size: 17px; font-weight: 650; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary span { color: var(--gold); font-size: 22px; font-weight: 400; transition: transform .2s; }
.faq-list details[open] summary span { transform: rotate(45deg); }
.faq-list details p { margin: -6px 48px 24px 0; color: var(--muted); font-size: 14px; }

.contact-band { position: relative; overflow: hidden; padding: 112px 0; background: #111014; }
.contact-band::before { content: ""; position: absolute; inset: 0; opacity: .5; background-image: radial-gradient(circle at 15% 30%, #fff 0 1px, transparent 1.7px), radial-gradient(circle at 75% 20%, #e9bd62 0 1px, transparent 1.7px), radial-gradient(circle at 35% 75%, #fff 0 1px, transparent 1.7px), radial-gradient(circle at 90% 80%, #48d8d2 0 1px, transparent 1.7px); background-size: 260px 260px, 350px 350px, 420px 420px, 300px 300px; }
.contact-band::after { content: ""; position: absolute; left: -10%; bottom: -240px; width: 120%; height: 320px; border-top: 1px solid rgba(233,189,98,.24); border-radius: 50%; box-shadow: 0 -50px 100px rgba(255,83,111,.05); }
.contact-inner { position: relative; z-index: 2; display: grid; grid-template-columns: 1fr 1fr; gap: 100px; align-items: center; }
.contact-inner > div:first-child > p:last-child { max-width: 530px; margin: 24px 0 0; color: var(--muted); }
.contact-actions { border-top: 1px solid var(--line-strong); }
.contact-link { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 18px; min-height: 88px; padding: 15px 8px; border-bottom: 1px solid var(--line-strong); transition: padding .18s, color .18s; }
.contact-link:hover { padding-inline: 16px; color: var(--gold); }
.contact-icon { display: grid; place-items: center; width: 46px; height: 46px; color: #111; border-radius: 50%; background: var(--gold); }
.contact-wechat .contact-icon { background: var(--cyan); }
.contact-link > span:nth-child(2) { display: flex; flex-direction: column; line-height: 1.4; }
.contact-link small { color: #77787e; font-size: 9px; font-weight: 800; letter-spacing: .14em; }
.contact-link strong { font-size: 17px; }
.contact-link b { font-size: 22px; font-weight: 400; }
.contact-tip { margin: 12px 0 0; color: #6f7076; font-size: 11px; }

.legal-note { padding: 24px 0; border-block: 1px solid var(--line); background: #0d0e12; }
.legal-note .section-shell { display: grid; grid-template-columns: 120px 1fr; gap: 24px; }
.legal-note strong { color: var(--gold); font-size: 13px; }
.legal-note p { margin: 0; color: #85868c; font-size: 12px; }

.site-footer { padding: 46px 0 34px; background: #08090c; }
.footer-inner { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 28px; }
.footer-inner > p { margin: 0; color: #73747a; font-size: 12px; }
.footer-links { display: flex; gap: 20px; color: #9a9ba1; font-size: 12px; }
.footer-links a:hover { color: var(--gold); }
.footer-inner small { grid-column: 1 / -1; padding-top: 22px; color: #55565c; border-top: 1px solid var(--line); font-size: 11px; }

:focus-visible { outline: 2px solid var(--gold); outline-offset: 3px; }

@media (max-width: 1080px) {
  .site-nav { gap: 18px; }
  .site-nav a:nth-child(2), .site-nav a:nth-child(4) { display: none; }
  .hero-inner { grid-template-columns: minmax(0, 1fr) minmax(330px, .7fr); gap: 34px; }
  .hero h1 { font-size: 92px; }
  .feature-grid { grid-template-columns: repeat(3, 1fr); }
  .feature-wide { grid-column: span 1; }
  .gallery-layout { grid-template-columns: .9fr 1.1fr; }
}

@media (max-width: 820px) {
  :root { --header-h: 64px; }
  .section-shell, .nav-shell, .hero-inner { width: min(calc(100% - 32px), var(--max)); }
  .site-header { background: rgba(8,9,12,.88); }
  .menu-toggle { display: grid; width: 42px; height: 42px; padding: 10px; border: 0; background: transparent; cursor: pointer; }
  .menu-toggle span { display: block; width: 22px; height: 1px; margin: 3px auto; background: #fff; transition: transform .2s, opacity .2s; }
  .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-nav { position: fixed; inset: var(--header-h) 0 auto; display: flex; flex-direction: column; align-items: stretch; gap: 0; width: 100%; height: calc(100svh - var(--header-h)); padding: 24px 16px; overflow-y: auto; background: rgba(8,9,12,.98); transform: translateX(100%); transition: transform .22s ease; }
  .site-nav.open { transform: translateX(0); }
  .site-nav a, .site-nav a:nth-child(2), .site-nav a:nth-child(4) { display: flex; align-items: center; min-height: 56px; padding: 10px 4px; border-bottom: 1px solid var(--line); font-size: 16px; }
  .site-nav > a:not(.nav-cta)::after { display: none; }
  .site-nav .nav-cta { justify-content: center; margin-top: 18px; color: #0d0d0f; border: 0; }

  .hero { min-height: auto; }
  .hero {
    height: min(820px, calc(100svh - 24px));
    min-height: 540px;
  }
  .hero-inner { display: block; min-height: 0; height: 100%; padding-top: 76px; padding-bottom: 0; }
  .hero-copy { text-align: center; }
  .eyebrow { justify-content: center; }
  .hero h1 { font-size: 78px; }
  .hero-lead { margin-inline: auto; font-size: 20px; }
  .hero-note { margin-inline: auto; }
  .hero-actions, .hero-proof { justify-content: center; }
  .hero-product {
    position: absolute;
    top: min(570px, calc(100% - 105px));
    left: 50%;
    width: min(calc(100% - 24px), 410px);
    height: 515px;
    min-height: 0;
    margin: 0;
    transform: translateX(-50%);
  }
  .phone-frame { right: 50%; bottom: -132px; width: 330px; transform: translateX(50%); }
  .floating-stat-gift { top: 45px; left: 0; }
  .floating-stat-rank { top: 110px; right: 0; bottom: auto; }
  .scroll-cue { display: none; }

  .section { padding: 80px 0; }
  .intro-grid, .download-layout, .faq-layout, .contact-inner { grid-template-columns: 1fr; gap: 40px; }
  .section-heading h2, .heading-row h2, .gallery-copy h2, .download-copy h2, .faq-layout h2, .contact-inner h2 { font-size: 38px; }
  .intro-copy { padding-top: 0; }
  .heading-row { align-items: start; flex-direction: column; gap: 18px; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .feature-item { min-height: 290px; }

  .video-showcase { grid-template-columns: 1fr; min-height: 0; }
  .video-copy { max-width: 620px; padding: 10px 0 50px; }
  .video-device-wrap { min-height: 760px; border-top: 1px solid var(--line); }
  .video-phone { width: min(72%, 340px); }

  .gallery-layout { grid-template-columns: 1fr; min-height: auto; }
  .gallery-copy { padding-right: 0; }
  .gallery-viewer { min-height: 700px; }
  .gallery-phone { bottom: -220px; width: min(58%, 390px); }
  .extra-list article { grid-template-columns: 60px 190px 1fr; }
  .contact-inner { gap: 48px; }
}

@media (max-width: 560px) {
  .section-shell, .nav-shell, .hero-inner { width: min(calc(100% - 24px), var(--max)); }
  .brand { font-size: 16px; }
  .brand-mark { width: 28px; height: 28px; }
  .hero-inner { padding-top: 60px; }
  .eyebrow { font-size: 11px; }
  .hero h1 { font-size: 60px; }
  .hero-lead { margin-top: 22px; font-size: 18px; }
  .hero-note { font-size: 14px; }
  .hero-actions { display: grid; grid-template-columns: 1fr; width: min(100%, 360px); margin: 28px auto 0; }
  .hero-proof { margin-top: 30px; }
  .hero-proof span { padding-inline: 10px; font-size: 10px; }
  .hero-product { height: 515px; }
  .phone-frame { bottom: -122px; width: 260px; border-radius: 30px 30px 0 0; }
  .phone-frame img { border-radius: 24px 24px 0 0; }
  .phone-speaker { width: 60px; height: 14px; }
  .floating-stat { min-width: 134px; padding: 8px 10px; }
  .floating-stat-gift { left: -6px; }
  .floating-stat-rank { right: -6px; }
  .floating-icon { width: 29px; height: 29px; }

  .section { padding: 68px 0; }
  .section-heading h2, .heading-row h2, .gallery-copy h2, .download-copy h2, .faq-layout h2, .contact-inner h2 { font-size: 32px; }
  .intro-copy .intro-large { font-size: 20px; }
  .intro-line { grid-template-columns: 38px 1fr; gap: 12px; }

  .feature-grid { grid-template-columns: 1fr; }
  .feature-item { min-height: 250px; padding: 24px 22px; }
  .feature-icon { margin-top: 32px; }
  .demo-heading { margin-bottom: 34px; }
  .video-copy h3 { font-size: 32px; }
  .video-copy > p { margin-block: 20px 28px; font-size: 14px; }
  .video-device-wrap { min-height: 650px; }
  .video-phone { width: min(78%, 286px); padding: 8px; border-radius: 42px; }
  .video-phone video { border-radius: 35px; }
  .video-speaker { top: 16px; width: 72px; height: 19px; }
  .video-camera { top: 22px; left: calc(50% + 23px); width: 6px; height: 6px; }
  .video-reflection { inset: 8px; border-radius: 35px; }

  .gallery-tabs { grid-template-columns: 1fr 1fr; }
  .gallery-viewer { min-height: 590px; }
  .gallery-phone { bottom: -170px; width: min(74%, 330px); border-radius: 34px 34px 0 0; }
  .gallery-phone img { border-radius: 27px 27px 0 0; }
  .extra-list article { grid-template-columns: 44px 1fr; gap: 14px; }
  .extra-list article p { grid-column: 2; }
  .download-link { gap: 14px; min-height: 104px; padding-inline: 0; }
  .download-link:hover { padding-inline: 8px; }
  .download-icon { width: 44px; height: 44px; }
  .download-link strong { font-size: 17px; }
  .invite-panel strong { font-size: 21px; }
  .faq-list summary { font-size: 15px; }
  .contact-band { padding: 78px 0; }
  .contact-link { gap: 12px; }
  .legal-note .section-shell { grid-template-columns: 1fr; gap: 6px; }
  .footer-inner { grid-template-columns: 1fr; gap: 14px; }
  .footer-inner small { grid-column: 1; }
}

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