/* Landing pages only (index.html, zh.html). Legal pages keep style.css alone.
   Dark-first "tech" look; every animation is off under prefers-reduced-motion. */
body.landing {
  --l-bg: #050f0e;
  --l-bg2: #071917;
  --l-card: rgba(255, 255, 255, 0.04);
  --l-card-hi: rgba(255, 255, 255, 0.07);
  --l-line: rgba(255, 255, 255, 0.09);
  --l-ink: #eaf4f2;
  --l-sub: #93aba7;
  --l-brand: #2dd4bf;
  --l-brand-2: #0f766e;
  --l-glow: rgba(45, 212, 191, 0.35);
  --c-uni: #a78bfa;
  --c-gofo: #fb923c;
  --c-swift: #38bdf8;
  --c-speed: #facc15;
  --c-yan: #f472b6;
  background: var(--l-bg);
  color: var(--l-ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body.landing a { color: var(--l-brand); }
body.landing p, body.landing li { color: inherit; }

/* Background: soft glows + a faint moving grid */
.bg { position: fixed; inset: 0; z-index: -1; pointer-events: none; overflow: hidden; }
.bg::before {
  content: ""; position: absolute; inset: -40%;
  background:
    radial-gradient(40% 35% at 25% 20%, rgba(45, 212, 191, 0.16), transparent 70%),
    radial-gradient(35% 30% at 80% 10%, rgba(56, 189, 248, 0.10), transparent 70%),
    radial-gradient(45% 40% at 70% 85%, rgba(167, 139, 250, 0.08), transparent 70%);
  animation: drift 24s ease-in-out infinite alternate;
}
.bg::after {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 20%, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 20%, #000 30%, transparent 75%);
  animation: grid 30s linear infinite;
}
@keyframes drift { to { transform: translate3d(4%, 3%, 0) rotate(6deg); } }
@keyframes grid { to { background-position: 56px 56px, 56px 56px; } }

/* Top bar */
.top { position: sticky; top: 0; z-index: 20; backdrop-filter: saturate(160%) blur(14px); -webkit-backdrop-filter: saturate(160%) blur(14px); background: rgba(5, 15, 14, 0.6); border-bottom: 1px solid var(--l-line); }
.top-in { max-width: 1160px; margin: 0 auto; padding: 14px 20px; display: flex; align-items: center; gap: 24px; }
.top .logo { color: var(--l-ink); font-size: 22px; font-weight: 750; letter-spacing: -0.02em; text-decoration: none; }
.top .logo span { color: var(--l-brand); }
.top nav { display: flex; gap: 22px; margin-left: auto; align-items: center; }
.top nav a { color: var(--l-sub); text-decoration: none; font-size: 15px; transition: color .2s; margin: 0; }
.top nav a:hover { color: var(--l-ink); }
.top nav a.pill { color: var(--l-ink); border: 1px solid var(--l-line); padding: 6px 14px; border-radius: 999px; }

.wrap { max-width: 1160px; margin: 0 auto; padding: 0 20px; }

/* Hero */
.hero { display: grid; grid-template-columns: 1fr 1.05fr; gap: 40px; align-items: center; padding: 72px 0 56px; }
.eyebrow { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; letter-spacing: .02em; color: var(--l-brand); border: 1px solid rgba(45, 212, 191, .3); background: rgba(45, 212, 191, .06); padding: 6px 12px; border-radius: 999px; margin-bottom: 20px; }
.eyebrow i { width: 7px; height: 7px; border-radius: 50%; background: var(--l-brand); box-shadow: 0 0 12px var(--l-brand); animation: pulse 2s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: .35; } }
.hero h1 { font-size: clamp(38px, 5.4vw, 64px); line-height: 1.04; letter-spacing: -0.035em; margin: 0 0 20px; font-weight: 800; }
.grad { background: linear-gradient(100deg, #5eead4 0%, #2dd4bf 35%, #38bdf8 70%, #a78bfa 100%); -webkit-background-clip: text; background-clip: text; color: transparent; background-size: 200% 100%; animation: sheen 8s ease-in-out infinite alternate; }
@keyframes sheen { to { background-position: 100% 0; } }
.lead { font-size: 18px; line-height: 1.6; color: var(--l-sub); margin: 0 0 28px; max-width: 34em; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 14px; }
.btn { position: relative; display: inline-flex; align-items: center; gap: 10px; padding: 13px 22px; border-radius: 14px; font-weight: 650; font-size: 16px; text-decoration: none; transition: transform .2s, box-shadow .2s, background .2s; }
.btn svg { width: 20px; height: 20px; flex: none; }
.btn.primary { color: #03201c; background: linear-gradient(135deg, #5eead4, #2dd4bf 50%, #14b8a6); box-shadow: 0 8px 30px -8px var(--l-glow), inset 0 1px 0 rgba(255, 255, 255, .4); }
body.landing .btn.primary { color: #03201c; }
.btn.primary:hover { transform: translateY(-2px); box-shadow: 0 14px 40px -8px var(--l-glow), inset 0 1px 0 rgba(255, 255, 255, .4); }
.btn.ghost { color: var(--l-sub); border: 1px solid var(--l-line); background: var(--l-card); cursor: default; }
.note { font-size: 14px; color: var(--l-sub); margin: 0; }

/* Hero animation */
.flow { width: 100%; height: auto; overflow: visible; }
.flow .src rect { fill: rgba(255, 255, 255, .04); stroke: rgba(255, 255, 255, .12); }
.flow .src text { fill: var(--l-ink); font-size: 13px; font-weight: 600; }
.flow .stream { fill: none; stroke-width: 2; stroke-linecap: round; stroke-dasharray: 3 9; animation: flowdash 1.2s linear infinite; opacity: .9; }
@keyframes flowdash { to { stroke-dashoffset: -24; } }
.flow .hub-ring { fill: none; stroke: var(--l-brand); stroke-width: 1.5; opacity: .5; transform-origin: 250px 210px; animation: ring 3s ease-out infinite; }
@keyframes ring { from { transform: scale(.8); opacity: .7; } to { transform: scale(1.6); opacity: 0; } }
.flow .route { fill: none; stroke: url(#routeGrad); stroke-width: 4; stroke-linecap: round; stroke-linejoin: round; stroke-dasharray: 900; stroke-dashoffset: 900; animation: draw 2.6s .5s cubic-bezier(.6, .1, .2, 1) forwards; filter: drop-shadow(0 0 6px rgba(45, 212, 191, .6)); }
@keyframes draw { to { stroke-dashoffset: 0; } }
.flow .stop { opacity: 0; transform-box: fill-box; transform-origin: center; animation: pop .5s cubic-bezier(.3, 1.6, .5, 1) forwards; }
.flow .stop circle { fill: #062a26; stroke: var(--l-brand); stroke-width: 2; }
.flow .stop text { fill: var(--l-ink); font-size: 12px; font-weight: 750; text-anchor: middle; dominant-baseline: central; }
@keyframes pop { from { opacity: 0; transform: scale(.4); } to { opacity: 1; transform: scale(1); } }
.flow .runner { fill: #fff; filter: drop-shadow(0 0 8px #5eead4); }

/* Facts strip (product facts, not traffic numbers) */
.facts { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--l-line); border: 1px solid var(--l-line); border-radius: 20px; overflow: hidden; margin: 8px 0 24px; }
.fact { background: var(--l-bg2); padding: 22px 20px; }
.fact b { display: block; font-size: 34px; font-weight: 800; letter-spacing: -0.03em; background: linear-gradient(120deg, #eafffb, #5eead4); -webkit-background-clip: text; background-clip: text; color: transparent; }
.fact span { color: var(--l-sub); font-size: 14px; }

/* Sections */
.sec { padding: 88px 0 24px; }
.kicker { color: var(--l-brand); font-size: 13px; letter-spacing: .1em; text-transform: uppercase; font-weight: 650; margin: 0 0 10px; }
.sec h2 { font-size: clamp(28px, 3.6vw, 42px); letter-spacing: -0.03em; line-height: 1.1; margin: 0 0 14px; font-weight: 800; }
.sec .sub { color: var(--l-sub); font-size: 17px; max-width: 40em; margin: 0 0 36px; }

/* Steps with a connecting line */
.steps { position: relative; display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.steps::before { content: ""; position: absolute; top: 34px; left: 8%; right: 8%; height: 2px; background: linear-gradient(90deg, transparent, var(--l-brand), transparent); opacity: .35; }
.step { position: relative; background: var(--l-card); border: 1px solid var(--l-line); border-radius: 20px; padding: 24px; }
.step .num { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 14px; background: linear-gradient(135deg, rgba(45, 212, 191, .25), rgba(56, 189, 248, .15)); border: 1px solid rgba(45, 212, 191, .4); color: var(--l-ink); font-weight: 800; margin-bottom: 16px; box-shadow: 0 0 24px -6px var(--l-glow); }
.step h3 { margin: 0 0 8px; font-size: 19px; }
.step p { margin: 0; color: var(--l-sub); font-size: 15px; line-height: 1.6; }

/* Feature split */
.split { display: grid; grid-template-columns: 1.25fr .75fr; gap: 48px; align-items: center; }
.split.flip { grid-template-columns: .75fr 1.25fr; }
.split.flip .phone-wrap { order: -1; }
.feats { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.feat { position: relative; background: var(--l-card); border: 1px solid var(--l-line); border-radius: 18px; padding: 18px; transition: border-color .25s, background .25s, transform .25s; overflow: hidden; }
.feat::after { content: ""; position: absolute; inset: 0; background: radial-gradient(260px circle at var(--mx, 50%) var(--my, 0%), rgba(45, 212, 191, .14), transparent 60%); opacity: 0; transition: opacity .3s; pointer-events: none; }
.feat:hover { border-color: rgba(45, 212, 191, .35); background: var(--l-card-hi); transform: translateY(-2px); }
.feat:hover::after { opacity: 1; }
.feat svg { width: 26px; height: 26px; color: var(--l-brand); margin-bottom: 10px; }
.feat strong { display: block; font-size: 16px; margin-bottom: 4px; }
.feat span { color: var(--l-sub); font-size: 14px; line-height: 1.55; }

.phone-wrap { perspective: 1200px; display: flex; justify-content: center; position: relative; }
.phone-wrap::before { content: ""; position: absolute; width: 70%; height: 70%; top: 15%; left: 15%; background: radial-gradient(circle, var(--l-glow), transparent 70%); filter: blur(40px); z-index: -1; }
.phone { width: 100%; max-width: 290px; border-radius: 36px; padding: 8px; background: linear-gradient(160deg, #1c2b29, #0a1413); border: 1px solid rgba(255, 255, 255, .12); box-shadow: 0 40px 80px -30px rgba(0, 0, 0, .8), 0 0 0 1px rgba(0, 0, 0, .4); transform: rotateY(var(--ry, -8deg)) rotateX(var(--rx, 4deg)); transition: transform .4s ease-out; animation: float 6s ease-in-out infinite; }
.phone img { display: block; width: 100%; height: auto; border-radius: 29px; }
@keyframes float { 50% { translate: 0 -10px; } }

/* Platforms marquee */
.marquee { position: relative; overflow: hidden; mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent); -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent); margin: 0 0 28px; }
.track { display: flex; gap: 14px; width: max-content; animation: scroll 26s linear infinite; }
.marquee:hover .track { animation-play-state: paused; }
@keyframes scroll { to { transform: translateX(-50%); } }
.chip { display: inline-flex; align-items: center; gap: 10px; padding: 12px 22px; border-radius: 999px; border: 1px solid var(--l-line); background: var(--l-card); font-weight: 700; font-size: 17px; white-space: nowrap; }
.chip i { width: 10px; height: 10px; border-radius: 50%; }
.statement { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.statement div { border: 1px solid var(--l-line); border-radius: 18px; padding: 20px; background: linear-gradient(180deg, var(--l-card-hi), transparent); }
.statement b { display: block; font-size: 17px; margin-bottom: 6px; }
.statement span { color: var(--l-sub); font-size: 14px; line-height: 1.55; }
.fine { color: var(--l-sub); font-size: 14px; margin-top: 18px; }

/* Privacy */
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.glass { border: 1px solid var(--l-line); border-radius: 20px; padding: 24px; background: var(--l-card); }
.glass h3 { margin: 0 0 8px; font-size: 18px; display: flex; align-items: center; gap: 10px; }
.glass h3 svg { width: 22px; height: 22px; color: var(--l-brand); }
.glass p { margin: 0; color: var(--l-sub); line-height: 1.6; }

/* FAQ */
.faq details { border: 1px solid var(--l-line); border-radius: 16px; padding: 0 20px; margin-bottom: 10px; background: var(--l-card); transition: border-color .2s; }
.faq details[open] { border-color: rgba(45, 212, 191, .35); }
.faq summary { cursor: pointer; font-weight: 650; list-style: none; display: flex; justify-content: space-between; gap: 16px; padding: 18px 0; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--l-brand); font-weight: 700; font-size: 20px; line-height: 1; transition: transform .25s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { margin: 0 0 18px; color: var(--l-sub); line-height: 1.6; }

/* Final CTA */
.final { position: relative; text-align: center; margin: 96px 0 48px; padding: 56px 24px; border-radius: 28px; overflow: hidden; border: 1px solid rgba(45, 212, 191, .3); background: radial-gradient(80% 120% at 50% 0%, rgba(45, 212, 191, .22), transparent 70%), var(--l-bg2); }
.final h2 { font-size: clamp(28px, 3.6vw, 40px); letter-spacing: -0.03em; margin: 0 0 12px; }
.final p { color: var(--l-sub); margin: 0 auto 24px; max-width: 34em; }
.final .cta { justify-content: center; }

.foot { border-top: 1px solid var(--l-line); padding: 28px 0 48px; color: var(--l-sub); font-size: 13px; line-height: 1.6; }
.foot nav { display: flex; flex-wrap: wrap; gap: 18px; margin-bottom: 12px; }
.foot nav a { color: var(--l-ink); text-decoration: none; font-size: 14px; margin: 0; }

/* Scroll reveal (JS adds .in; without JS everything stays visible) */
.js .reveal { opacity: 0; transform: translateY(24px); transition: opacity .8s ease, transform .8s cubic-bezier(.2, .7, .2, 1); }
.js .reveal.in { opacity: 1; transform: none; }
.js .reveal.d1 { transition-delay: .08s; } .js .reveal.d2 { transition-delay: .16s; } .js .reveal.d3 { transition-delay: .24s; }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; padding-top: 40px; }
  .facts { grid-template-columns: 1fr 1fr; }
  .steps, .statement { grid-template-columns: 1fr; }
  .steps::before { display: none; }
  .split, .split.flip { grid-template-columns: 1fr; gap: 32px; }
  .split .phone-wrap, .split.flip .phone-wrap { order: 1; }
  .phone { max-width: 250px; }
  .grid2 { grid-template-columns: 1fr; }
  .top nav a.hide-sm { display: none; }
}
@media (max-width: 560px) {
  .feats { grid-template-columns: 1fr; }
  .sec { padding-top: 64px; }
  .fact b { font-size: 28px; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .flow .route { stroke-dashoffset: 0; }
  .flow .stop { opacity: 1; }
  .flow .runner { display: none; }
  .js .reveal { opacity: 1; transform: none; }
}

/* Anchor jumps land below the sticky bar */
body.landing section[id] { scroll-margin-top: 72px; }

/* "More platforms coming" — dashed, muted */
.flow .src.more rect { fill: transparent; stroke-dasharray: 4 4; stroke: rgba(255, 255, 255, .22); }
.flow .src.more text { fill: var(--l-sub); font-weight: 600; }
.flow .stream.more { opacity: .45; }
.chip.more { border-style: dashed; color: var(--l-sub); font-weight: 600; }