/* ============================================================
   威流 VAI · 企业介绍站
   Design language: Apple-like restraint × VAI brand system
   ============================================================ */

:root{
  /* brand */
  --flame:#FF6A2B;
  --red:#FF3D5E;
  --amber:#FFB35C;
  --green:#3ECF8E;
  --ink:#0B0D11;
  --ink-2:#101319;
  --ink-3:#151922;
  --cream:#F4F1EA;
  --paper:#F7F4EE;
  --paper-2:#EFEBE2;
  --muted:#8C8880;
  --muted-dark:#6E6A62;

  /* text on dark */
  --t1:#F4F1EA;
  --t2:rgba(244,241,234,.66);
  --t3:rgba(244,241,234,.42);
  --line:rgba(255,255,255,.09);

  /* text on light */
  --i1:#12141A;
  --i2:#4E4A44;
  --i3:#8A857D;
  --line-light:rgba(18,20,26,.10);

  /* motion */
  --ease:cubic-bezier(.22,.61,.36,1);
  --ease-out:cubic-bezier(.16,1,.3,1);

  /* layout */
  --max:1200px;
  --nav-h:72px;
  --radius:24px;
  --radius-sm:16px;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}

html{
  overflow-x:clip;
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--nav-h) + 12px);
}

body{
  background:var(--ink);
  color:var(--t1);
  font-family:-apple-system,BlinkMacSystemFont,"SF Pro Text","PingFang SC","Helvetica Neue",Arial,sans-serif;
  font-size:16px;
  line-height:1.62;
  letter-spacing:-0.01em;
  -webkit-font-smoothing:antialiased;
  overflow-x:clip;
  -webkit-tap-highlight-color:transparent;
}

img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
::selection{background:rgba(255,106,43,.28);color:#fff}

:focus-visible{
  outline:2px solid var(--flame);
  outline-offset:3px;
  border-radius:6px;
}

.container{
  width:100%;
  max-width:var(--max);
  margin-inline:auto;
  padding-inline:clamp(20px,5vw,48px);
}
.container.narrow{max-width:900px}

/* ---------- typography ---------- */
h1,h2,h3,h4{font-weight:800;letter-spacing:-0.035em;line-height:1.06}
h1{font-size:clamp(44px,6.1vw,84px);letter-spacing:-0.045em}
h2{font-size:clamp(34px,4.6vw,60px);line-height:1.08}
h3{font-size:clamp(21px,2.2vw,28px);letter-spacing:-0.02em}

.eyebrow,.kicker{
  font-family:"Space Grotesk",-apple-system,sans-serif;
  font-size:12px;
  font-weight:500;
  letter-spacing:.26em;
  text-transform:uppercase;
  color:var(--t3);
}
.kicker-flame{color:var(--flame)}
.sec-sub{
  font-size:clamp(15px,1.5vw,18px);
  color:var(--t2);
  max-width:56ch;
  margin-top:18px;
  letter-spacing:0;
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:48px;padding:0 26px;border-radius:999px;
  font-size:15px;font-weight:600;letter-spacing:-.01em;
  transition:transform .2s var(--ease),background .2s var(--ease),box-shadow .3s var(--ease),color .2s var(--ease);
  will-change:transform;
}
.btn-primary{
  background:linear-gradient(120deg,var(--flame),#FF7F45 55%,var(--red));
  color:#120A06;
  box-shadow:0 8px 30px rgba(255,106,43,.28), inset 0 1px 0 rgba(255,255,255,.28);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 40px rgba(255,106,43,.38)}
.btn-primary:active{transform:translateY(0) scale(.985)}
.btn-ghost{
  color:var(--t1);
  border:1px solid rgba(244,241,234,.18);
  background:rgba(244,241,234,.03);
  backdrop-filter:blur(8px);
}
.btn-ghost:hover{background:rgba(244,241,234,.08);transform:translateY(-2px)}
.btn-ghost span{transition:transform .25s var(--ease)}
.btn-ghost:hover span{transform:translateX(4px)}
.btn-sm{min-height:40px;padding:0 18px;font-size:14px}
.btn-lg{min-height:54px;padding:0 32px;font-size:16px}
.btn-block{width:100%}

.text-link{
  display:inline-flex;align-items:center;gap:8px;
  font-size:15px;font-weight:600;color:var(--flame);
  margin-top:18px;transition:gap .25s var(--ease);
}
.text-link:hover{gap:14px}

/* ---------- nav ---------- */
.nav{
  position:fixed;inset:0 0 auto;z-index:100;
  height:var(--nav-h);
  display:flex;align-items:center;
  border-bottom:1px solid transparent;
  transition:background .35s var(--ease),border-color .35s var(--ease),backdrop-filter .35s var(--ease);
}
.nav.scrolled{
  background:rgba(11,13,17,.72);
  backdrop-filter:saturate(180%) blur(20px);
  -webkit-backdrop-filter:saturate(180%) blur(20px);
  border-bottom-color:rgba(255,255,255,.08);
}
.nav-inner{
  width:100%;max-width:var(--max);margin-inline:auto;
  padding-inline:clamp(20px,5vw,48px);
  display:flex;align-items:center;gap:32px;
}
.brand{display:flex;align-items:center;gap:12px;flex-shrink:0}
.brand-brush{height:26px;width:auto}
.brand-sep{width:1px;height:18px;background:rgba(244,241,234,.22)}
.brand-vai{height:19px;width:auto}
.nav-links{display:flex;gap:30px;margin-left:auto}
.nav-links a{
  font-size:14px;color:rgba(244,241,234,.72);
  transition:color .2s var(--ease);position:relative;
}
.nav-links a::after{
  content:"";position:absolute;left:0;right:0;bottom:-6px;height:1px;
  background:var(--flame);transform:scaleX(0);transform-origin:left;
  transition:transform .3s var(--ease);
}
.nav-links a:hover{color:var(--t1)}
.nav-links a:hover::after{transform:scaleX(1)}
.nav-cta{flex-shrink:0}

.menu-btn{
  display:none;width:44px;height:44px;margin-left:auto;
  position:relative;border-radius:12px;
}
.menu-btn span{
  position:absolute;left:11px;right:11px;height:1.5px;background:var(--cream);
  transition:transform .35s var(--ease),opacity .2s var(--ease);
}
.menu-btn span:nth-child(1){top:19px}
.menu-btn span:nth-child(2){top:25px}
.menu-btn[aria-expanded="true"] span:nth-child(1){transform:translateY(3px) rotate(45deg)}
.menu-btn[aria-expanded="true"] span:nth-child(2){transform:translateY(-3px) rotate(-45deg)}

.mobile-menu{
  position:fixed;inset:0;z-index:99;
  background:rgba(11,13,17,.92);
  backdrop-filter:saturate(160%) blur(24px);
  -webkit-backdrop-filter:saturate(160%) blur(24px);
  padding:calc(var(--nav-h) + env(safe-area-inset-top) + 28px) 24px calc(32px + env(safe-area-inset-bottom));
  display:flex;flex-direction:column;
  opacity:0;visibility:hidden;transform:translateY(-8px);
  transition:opacity .35s var(--ease),transform .35s var(--ease),visibility .35s;
}
.mobile-menu.open{opacity:1;visibility:visible;transform:none}
.mobile-menu nav{display:flex;flex-direction:column}
.mobile-menu nav a{
  font-size:30px;font-weight:700;letter-spacing:-.03em;
  padding:16px 0;border-bottom:1px solid rgba(255,255,255,.08);
}
.mobile-menu .btn{margin-top:32px}
.mm-foot{margin-top:auto;font-size:12px;color:var(--t3);letter-spacing:.1em}

/* ---------- hero ---------- */
.hero{
  position:relative;
  min-height:100vh;
  min-height:100svh;
  display:flex;align-items:center;
  padding-top:calc(var(--nav-h) + 56px);
  padding-bottom:80px;
  overflow:hidden;
}
.hero-glow{
  position:absolute;inset:-20% -10% auto -10%;height:120%;
  background:
    radial-gradient(48% 42% at 18% 18%, rgba(255,106,43,.22), transparent 60%),
    radial-gradient(42% 38% at 82% 72%, rgba(255,61,94,.14), transparent 62%),
    radial-gradient(60% 50% at 50% 105%, rgba(255,106,43,.08), transparent 65%);
  filter:blur(10px);
  pointer-events:none;
}
.hero-grid{
  position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.028) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.028) 1px,transparent 1px);
  background-size:80px 80px;
  mask-image:radial-gradient(70% 60% at 50% 40%,#000 0%,transparent 78%);
  -webkit-mask-image:radial-gradient(70% 60% at 50% 40%,#000 0%,transparent 78%);
  pointer-events:none;
}
.hero-inner{
  position:relative;
  display:grid;grid-template-columns:1.04fr .96fr;
  gap:clamp(32px,5vw,72px);
  align-items:center;
}
.hero-copy h1{margin:18px 0 24px}
.hero-sub{
  font-size:clamp(16px,1.7vw,19px);
  color:var(--t2);
  max-width:36ch;
  line-height:1.72;
  letter-spacing:0;
}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:34px}
.hero-meta{
  margin-top:26px;font-size:12.5px;color:var(--t3);
  letter-spacing:.14em;text-transform:uppercase;
}
.hero-visual{position:relative;will-change:transform}
.screen-frame{
  border-radius:20px;overflow:hidden;
  background:#0A0C11;
  border:1px solid rgba(255,255,255,.12);
  box-shadow:0 40px 120px rgba(0,0,0,.6),0 0 0 1px rgba(255,106,43,.12),0 0 80px rgba(255,106,43,.14);
  transform:perspective(1400px) rotateY(-5deg) rotateX(1.5deg);
  transition:transform .8s var(--ease);
}
.hero-visual:hover .screen-frame{transform:perspective(1400px) rotateY(-2deg) rotateX(1deg)}
.screen-bar{
  display:flex;align-items:center;gap:6px;
  height:34px;padding:0 14px;
  background:rgba(255,255,255,.035);
  border-bottom:1px solid rgba(255,255,255,.07);
}
.screen-bar i{width:8px;height:8px;border-radius:50%;background:rgba(255,255,255,.16)}
.screen-bar i:first-child{background:#FF6A2B99}
.screen-bar span{
  margin-left:10px;font-size:10.5px;letter-spacing:.14em;color:rgba(244,241,234,.4);
  font-family:"Space Grotesk",sans-serif;
}
.scroll-hint{
  position:absolute;left:50%;bottom:26px;transform:translateX(-50%);
  width:1px;height:52px;background:rgba(244,241,234,.14);overflow:hidden;
}
.scroll-hint span{
  position:absolute;inset:0;background:linear-gradient(180deg,transparent,var(--flame));
  animation:scrollLine 2.4s var(--ease) infinite;
}
@keyframes scrollLine{0%{transform:translateY(-100%)}60%,100%{transform:translateY(100%)}}

/* ---------- platforms strip ---------- */
.strip{
  border-block:1px solid rgba(255,255,255,.06);
  padding:22px 0;
  overflow:hidden;
  background:rgba(255,255,255,.012);
}
.strip-track{
  display:flex;align-items:center;gap:clamp(20px,3vw,40px);
  justify-content:center;flex-wrap:nowrap;
  width:max-content;margin-inline:auto;padding-inline:24px;
}
.strip-track span{
  font-size:13.5px;letter-spacing:.1em;color:rgba(244,241,234,.34);
  white-space:nowrap;transition:color .3s var(--ease);
}
.strip-track span:hover{color:rgba(244,241,234,.62)}
.strip-track i{width:3px;height:3px;border-radius:50%;background:rgba(255,106,43,.5);flex-shrink:0}

/* ---------- sections ---------- */
.section{padding:clamp(76px,10vw,140px) 0;position:relative}
.section-light{background:var(--paper);color:var(--i1)}
.section-light .kicker{color:var(--i3)}
.section-light .kicker-flame{color:var(--flame)}
.section-light .sec-sub{color:var(--i2)}
.section-dark{background:var(--ink)}
.sec-head{max-width:820px;margin-bottom:clamp(40px,5vw,64px)}
.sec-head h2{margin-top:14px}

/* reveal */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .9s var(--ease-out),transform .9s var(--ease-out);transition-delay:var(--d,0s)}
.reveal.in{opacity:1;transform:none}

/* ---------- bento ---------- */
.bento{display:grid;grid-template-columns:repeat(12,1fr);gap:18px}
.card{
  position:relative;overflow:hidden;
  border-radius:var(--radius);
  padding:clamp(26px,3vw,38px);
  background:#fff;
  border:1px solid rgba(18,20,26,.07);
  box-shadow:0 1px 2px rgba(18,20,26,.04),0 18px 44px -28px rgba(18,20,26,.22);
  transition:transform .45s var(--ease),box-shadow .45s var(--ease);
}
.card:hover{transform:translateY(-4px);box-shadow:0 1px 2px rgba(18,20,26,.05),0 32px 70px -32px rgba(18,20,26,.3)}
.card-lg{grid-column:span 7}
.card-sm{grid-column:span 5}
.card-wide{grid-column:span 12;display:flex;align-items:center;gap:40px;padding-right:0}
.card-top{display:flex;align-items:center;gap:12px;margin-bottom:22px}
.card-no{
  font-family:"Space Grotesk",sans-serif;font-size:12px;letter-spacing:.16em;
  color:var(--flame);
}
.pill{
  font-size:11px;letter-spacing:.08em;padding:4px 11px;border-radius:999px;
  background:rgba(255,106,43,.12);color:#C24A15;border:1px solid rgba(255,106,43,.22);
}
.pill-ghost{background:rgba(18,20,26,.04);color:var(--i2);border-color:rgba(18,20,26,.1)}
.card h3{color:var(--i1)}
.card-sub{margin-top:10px;font-size:15.5px;color:var(--i2);max-width:42ch}
.ticks{list-style:none;margin-top:22px;display:grid;gap:10px}
.ticks li{
  position:relative;padding-left:22px;font-size:14.5px;color:var(--i2);
}
.ticks li::before{
  content:"";position:absolute;left:0;top:8px;width:10px;height:6px;
  border-left:1.6px solid var(--flame);border-bottom:1.6px solid var(--flame);
  transform:rotate(-45deg);
}
.card-art{
  position:absolute;right:-40px;bottom:-50px;width:240px;height:240px;pointer-events:none;
}
.card-art .orbit{
  position:absolute;inset:0;border:1px solid rgba(255,106,43,.18);border-radius:50%;
}
.card-art .o2{inset:36px;border-color:rgba(255,106,43,.14)}
.card-art .o3{inset:72px;border-color:rgba(255,106,43,.1)}
.card-art .dot{
  position:absolute;left:50%;top:50%;width:10px;height:10px;margin:-5px 0 0 -5px;
  border-radius:50%;background:var(--flame);box-shadow:0 0 24px rgba(255,106,43,.8);
}
.wide-copy{flex:1;min-width:0}
.wide-art{
  width:46%;flex-shrink:0;align-self:stretch;
  display:flex;align-items:center;
  overflow:hidden;position:relative;
}
.wide-art::before{
  content:"";position:absolute;inset:0;left:-30%;
  background:linear-gradient(90deg,var(--paper) 0%,rgba(247,244,238,0) 34%);
  z-index:1;pointer-events:none;
}
.wide-art img{
  width:150%;max-width:none;
  border-radius:16px 0 0 16px;
  border:1px solid rgba(18,20,26,.1);
  border-right:0;
  box-shadow:0 30px 60px -30px rgba(18,20,26,.4);
  transform:translateX(6%);
}

/* ---------- three layers ---------- */
.three{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.layer{
  padding:clamp(24px,2.6vw,34px);
  border-radius:var(--radius);
  background:linear-gradient(180deg,rgba(255,255,255,.045),rgba(255,255,255,.015));
  border:1px solid var(--line);
  transition:border-color .3s var(--ease),transform .45s var(--ease),background .3s var(--ease);
}
.layer:hover{border-color:rgba(255,106,43,.4);transform:translateY(-4px);background:linear-gradient(180deg,rgba(255,106,43,.08),rgba(255,255,255,.015))}
.layer-tag{font-family:"Space Grotesk",sans-serif;font-size:11px;letter-spacing:.18em;color:var(--flame)}
.layer h3{display:flex;align-items:center;gap:12px;margin:16px 0 14px;font-size:clamp(20px,2vw,26px)}
.glyph{
  display:inline-flex;align-items:center;justify-content:center;
  width:42px;height:42px;border-radius:50%;
  background:rgba(255,106,43,.12);border:1px solid rgba(255,106,43,.32);
  color:var(--flame);font-size:19px;font-weight:700;
}
.layer p{font-size:14.5px;color:var(--t2);line-height:1.75}
.mini{list-style:none;margin-top:20px;display:grid;gap:7px;border-top:1px solid rgba(255,255,255,.07);padding-top:16px}
.mini li{font-size:13px;color:var(--t3);letter-spacing:.01em}
.mini li::before{content:"·";color:var(--flame);margin-right:8px}

/* ---------- engine ---------- */
.engine{
  margin-top:clamp(48px,6vw,84px);
  padding:clamp(26px,3vw,40px);
  border-radius:var(--radius);
  border:1px solid rgba(255,106,43,.26);
  background:
    radial-gradient(90% 120% at 0% 0%,rgba(255,106,43,.12),transparent 55%),
    linear-gradient(180deg,rgba(255,255,255,.04),rgba(255,255,255,.01));
}
.engine-head{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;flex-wrap:wrap;margin-bottom:34px}
.engine-head h3{font-size:clamp(22px,2.4vw,30px)}
.engine-head p{font-size:14px;color:var(--t2);max-width:52ch}
.engine-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.ring{
  position:relative;padding:22px 20px 24px;border-radius:var(--radius-sm);
  background:rgba(10,12,17,.55);
  border:1px solid rgba(255,255,255,.08);
  transition:transform .4s var(--ease),border-color .3s var(--ease);
}
.ring::after{
  content:"→";position:absolute;right:-13px;top:50%;transform:translateY(-50%);
  color:rgba(255,106,43,.65);font-size:14px;z-index:1;
}
.ring:last-child::after{display:none}
.ring:hover{transform:translateY(-3px);border-color:rgba(255,106,43,.4)}
.ring-hi{border-color:rgba(255,106,43,.45);background:linear-gradient(160deg,rgba(255,106,43,.14),rgba(10,12,17,.6))}
.ring-no{font-family:"Space Grotesk",sans-serif;font-size:10.5px;letter-spacing:.2em;color:var(--flame)}
.ring h4{font-size:19px;margin:12px 0 8px;letter-spacing:-.02em}
.ring p{font-size:13px;color:var(--t2);line-height:1.7;min-height:66px}
.ring-tag{
  display:inline-block;margin-top:14px;font-size:11.5px;padding:4px 11px;border-radius:999px;
  background:rgba(255,106,43,.12);border:1px solid rgba(255,106,43,.28);color:#FF8A4D;
}
.engine-note{
  margin-top:28px;font-size:12.5px;letter-spacing:.16em;color:var(--t3);
  font-family:"Space Grotesk",sans-serif;text-align:center;
}

/* ---------- cockpit ---------- */
.cockpit-sec{padding-bottom:clamp(64px,8vw,110px)}
.cockpit-frame{
  border-radius:22px;overflow:hidden;
  border:1px solid rgba(18,20,26,.12);
  box-shadow:0 50px 100px -50px rgba(18,20,26,.55),0 0 0 8px rgba(18,20,26,.03);
  background:#0A0C11;
}
.cockpit-frame img{width:100%}
.cockpit-notes{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:36px}
.note{display:flex;flex-direction:column;gap:6px;padding-left:16px;border-left:2px solid rgba(255,106,43,.5)}
.note b{font-size:14px;color:var(--flame);letter-spacing:.04em}
.note span{font-size:14px;color:var(--i2)}

/* ---------- stats ---------- */
.stats{
  display:grid;grid-template-columns:repeat(3,1fr);gap:18px;
  padding-bottom:clamp(44px,6vw,72px);
  border-bottom:1px solid rgba(255,255,255,.07);
}
.stat{display:flex;flex-direction:column;gap:6px}
.stat b{
  font-family:"Space Grotesk",sans-serif;
  font-size:clamp(44px,6vw,76px);font-weight:700;line-height:1;
  letter-spacing:-.04em;
  background:linear-gradient(120deg,#F4F1EA,#FFB35C 70%,var(--flame));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.stat span{font-size:13.5px;color:var(--t3);letter-spacing:.06em}

/* ---------- loop ---------- */
.loop{display:grid;grid-template-columns:1fr 1fr;gap:clamp(32px,5vw,64px);align-items:center;padding-top:clamp(44px,6vw,72px)}
.loop-copy h2{margin:14px 0 18px}
.loop-art svg{width:100%;max-width:460px;margin-inline:auto;display:block}

/* ---------- steps ---------- */
.steps{
  list-style:none;display:grid;grid-template-columns:repeat(5,1fr);gap:16px;
  position:relative;
}
.steps::before{
  content:"";position:absolute;left:0;right:0;top:26px;height:1px;
  background:linear-gradient(90deg,var(--flame),rgba(255,106,43,.25) 60%,rgba(18,20,26,.12));
}
.step{position:relative;padding-top:0}
.step-no{
  position:relative;z-index:1;
  display:flex;align-items:center;justify-content:center;
  width:52px;height:52px;border-radius:50%;
  background:var(--paper);border:1px solid rgba(255,106,43,.5);
  font-family:"Space Grotesk",sans-serif;font-size:13px;color:var(--flame);
  margin-bottom:20px;
}
.step:nth-child(1) .step-no{background:linear-gradient(135deg,var(--flame),var(--red));color:#150A06;border-color:transparent}
.step h3{font-size:19px;color:var(--i1)}
.step p{font-size:13.5px;color:var(--i2);margin-top:8px;line-height:1.7;min-height:66px}
.step em{display:block;margin-top:10px;font-style:normal;font-size:11.5px;letter-spacing:.12em;color:var(--i3);font-family:"Space Grotesk",sans-serif}

/* ---------- plans ---------- */
.plans{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;align-items:stretch}
.plan{
  position:relative;display:flex;flex-direction:column;
  padding:clamp(26px,3vw,36px);border-radius:var(--radius);
  background:linear-gradient(180deg,rgba(255,255,255,.045),rgba(255,255,255,.012));
  border:1px solid var(--line);
  transition:transform .45s var(--ease),border-color .3s var(--ease);
}
.plan:hover{transform:translateY(-5px);border-color:rgba(255,106,43,.4)}
.plan-hi{border-color:rgba(255,106,43,.55);background:linear-gradient(180deg,rgba(255,106,43,.13),rgba(255,255,255,.015))}
.plan-badge{
  position:absolute;top:20px;right:20px;font-size:11px;font-weight:700;
  padding:4px 12px;border-radius:999px;background:var(--flame);color:#150A06;
}
.plan-tag{font-family:"Space Grotesk",sans-serif;font-size:10.5px;letter-spacing:.2em;color:var(--t3)}
.plan h3{font-size:clamp(22px,2.2vw,28px);margin:14px 0 6px}
.plan-sub{font-size:14px;color:var(--t2)}
.plan .ticks{margin-top:22px;flex:1}
.plan .ticks li{color:var(--t2)}
.plan-for{
  margin-top:22px;padding-top:16px;border-top:1px solid rgba(255,255,255,.08);
  font-size:12.5px;color:var(--t3);
}

/* ---------- founder ---------- */
.founder{
  display:grid;grid-template-columns:.85fr 1.15fr;gap:clamp(32px,5vw,72px);
  align-items:center;
  margin-top:clamp(56px,7vw,96px);
  padding-top:clamp(40px,5vw,64px);
  border-top:1px solid rgba(255,255,255,.07);
}
.founder-photo{display:flex;justify-content:center}
.photo-ring{
  width:clamp(180px,22vw,260px);aspect-ratio:1;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  background:radial-gradient(circle at 50% 45%,rgba(255,106,43,.18),transparent 65%);
  border:1px solid rgba(255,106,43,.32);
  box-shadow:0 0 0 14px rgba(255,106,43,.04),0 0 70px rgba(255,106,43,.14);
}
.photo-ring img{width:76%;height:auto;filter:drop-shadow(0 12px 30px rgba(0,0,0,.45))}
.founder-copy h3{font-size:clamp(26px,2.8vw,36px);margin:12px 0 16px}
.founder-copy p{font-size:15.5px;color:var(--t2);max-width:46ch;line-height:1.8}
.founder-copy blockquote{
  margin-top:24px;padding-left:18px;border-left:2px solid var(--flame);
  font-size:clamp(17px,1.8vw,21px);color:var(--cream);font-weight:600;letter-spacing:-.01em;
}

/* ---------- faq ---------- */
.faq{
  border-bottom:1px solid rgba(18,20,26,.12);
  padding:0;
}
.faq summary{
  list-style:none;cursor:pointer;
  display:flex;align-items:center;justify-content:space-between;gap:24px;
  padding:24px 0;font-size:clamp(16px,1.7vw,19px);font-weight:600;color:var(--i1);
  letter-spacing:-.01em;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary i{
  position:relative;flex-shrink:0;width:16px;height:16px;
}
.faq summary i::before,.faq summary i::after{
  content:"";position:absolute;left:0;top:7px;width:16px;height:1.5px;background:var(--i3);
  transition:transform .35s var(--ease),background .3s var(--ease);
}
.faq summary i::after{transform:rotate(90deg)}
.faq[open] summary i::after{transform:rotate(0)}
.faq[open] summary i::before,.faq[open] summary i::after{background:var(--flame)}
.faq-a{padding:0 0 26px;max-width:70ch}
.faq-a p{font-size:15px;color:var(--i2);line-height:1.85}

/* ---------- cta ---------- */
.cta{
  position:relative;overflow:hidden;
  padding:clamp(90px,12vw,160px) 0;
  text-align:center;
  border-top:1px solid rgba(255,255,255,.06);
}
.cta-glow{
  position:absolute;inset:auto -20% -60% -20%;height:130%;
  background:radial-gradient(50% 55% at 50% 60%,rgba(255,106,43,.22),transparent 68%);
  pointer-events:none;
}
.cta-inner{position:relative;display:flex;flex-direction:column;align-items:center}
.cta-brush{height:clamp(58px,7vw,86px);width:auto;margin-bottom:26px}
.cta h2{max-width:16ch}
.cta p{color:var(--t2);font-size:clamp(15px,1.6vw,18px);max-width:52ch;margin-top:20px}
.cta .hero-actions{justify-content:center;margin-top:36px}
.cta-note{margin-top:26px;font-size:12.5px;color:var(--t3);letter-spacing:.08em}

/* ---------- footer ---------- */
.footer{
  border-top:1px solid rgba(255,255,255,.08);
  padding:48px 0 calc(40px + env(safe-area-inset-bottom));
  background:#080A0E;
}
.footer-inner{display:flex;align-items:flex-start;justify-content:space-between;gap:40px;flex-wrap:wrap}
.fb-lockup{display:flex;align-items:center;gap:12px}
.fb-lockup img:first-child{height:24px;width:auto}
.fb-lockup span{width:1px;height:16px;background:rgba(244,241,234,.2)}
.fb-lockup img:last-child{height:17px;width:auto}
.footer-brand p{font-size:12.5px;color:var(--t3);margin-top:12px}
.footer-links{display:flex;gap:24px;flex-wrap:wrap}
.footer-links a{font-size:13px;color:var(--t2);transition:color .2s var(--ease)}
.footer-links a:hover{color:var(--flame)}
.footer-meta p{font-size:12px;color:var(--t3);text-align:right}
.footer-meta p:first-child{color:rgba(244,241,234,.5);margin-bottom:6px;letter-spacing:.06em}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width:1080px){
  .hero-inner{grid-template-columns:1fr;gap:48px}
  .hero-copy{max-width:640px}
  .hero-visual{max-width:720px}
  .screen-frame{transform:none}
  .three{grid-template-columns:1fr}
  .engine-grid{grid-template-columns:repeat(2,1fr)}
  .ring:nth-child(2)::after{display:none}
  .steps{grid-template-columns:repeat(3,1fr);row-gap:32px}
  .steps::before{display:none}
  .plans{grid-template-columns:1fr}
  .founder{grid-template-columns:1fr;text-align:left}
  .founder-photo{justify-content:flex-start}
}

@media (max-width:860px){
  :root{--nav-h:64px}
  .nav-links,.nav-cta{display:none}
  .menu-btn{display:block}
  .bento{grid-template-columns:1fr}
  .card-lg,.card-sm,.card-wide{grid-column:span 1}
  .card-wide{flex-direction:column;align-items:stretch;padding-right:clamp(26px,3vw,38px);gap:24px}
  .wide-art{width:100%;margin:0 -4px}
  .wide-art::before{display:none}
  .wide-art img{width:100%;transform:none;border-radius:12px;border-right:1px solid rgba(18,20,26,.1)}
  .loop{grid-template-columns:1fr}
  .cockpit-notes{grid-template-columns:1fr}
  .stats{grid-template-columns:1fr;gap:26px}
  .stat{flex-direction:row;align-items:baseline;gap:14px}
  .stat b{font-size:52px}
  .engine-grid{grid-template-columns:1fr}
  .ring::after{display:none}
  .ring p{min-height:0}
  .steps{grid-template-columns:1fr 1fr}
  .step p{min-height:0}
  .footer-inner{flex-direction:column;gap:28px}
  .footer-links{width:100%;justify-content:space-between;gap:12px}
  .footer-meta p{text-align:left}
}

@media (max-width:560px){
  body{font-size:15.5px}
  .hero{min-height:auto;padding-top:calc(var(--nav-h) + 40px);padding-bottom:64px}
  .hero-actions{gap:10px}
  .hero-actions .btn{width:100%}
  .strip-track{justify-content:flex-start;overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none}
  .strip-track::-webkit-scrollbar{display:none}
  .steps{grid-template-columns:1fr}
  .step-no{width:44px;height:44px;margin-bottom:14px}
  .sec-head{margin-bottom:32px}
  .cta .hero-actions .btn{width:100%}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  .scroll-hint span{animation:none}
  *{transition-duration:.01ms !important;animation-duration:.01ms !important}
}

/* ============================================================
   v2 · 交互增强（参考 landonorris.com 的动效语言，
   换成 VAI 的橙色体系）
   - 惯性平滑滚动 / 开场幕布 / 跟随光标
   - 逐字显影标题 / 速度感应跑马灯
   - 导航逐段反转明暗 / 横向钉住滚动
   - 3D 倾斜 + 光斑跟随 / 磁吸按钮
   ============================================================ */

html.js-smooth{scroll-behavior:auto}
html.lock{overflow:hidden}

/* ---------- 开场幕布 ---------- */
.intro{
  position:fixed;inset:0;z-index:9999;
  background:var(--ink);
  display:grid;place-items:center;
  clip-path:inset(0 0 0 0);
  will-change:clip-path;
}
.intro.out{clip-path:inset(0 0 100% 0);transition:clip-path 1.05s cubic-bezier(.76,0,.24,1)}
.intro-inner{width:min(520px,78vw)}
.intro-mark{
  width:min(300px,54vw);height:auto;
  margin-bottom:34px;
  opacity:0;transform:translateY(14px) scale(.96);
  animation:introMark .9s var(--ease-out) .15s forwards;
}
@keyframes introMark{to{opacity:1;transform:none}}
.intro-row{display:flex;align-items:baseline;justify-content:space-between;gap:20px}
.intro-tag{
  font-family:"Space Grotesk",sans-serif;font-size:10.5px;
  letter-spacing:.26em;color:var(--t3);
}
.intro-pct{
  font-family:"Space Grotesk",sans-serif;font-size:13px;
  color:var(--flame);letter-spacing:.06em;font-variant-numeric:tabular-nums;
}
.intro-bar{margin-top:14px;height:1px;background:rgba(255,255,255,.12);overflow:hidden}
.intro-bar i{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--flame),var(--red));
  transition:width .25s linear;
}

/* ---------- 跟随光标 ---------- */
.cursor-dot,.cursor-ring{
  position:fixed;left:0;top:0;z-index:9998;
  pointer-events:none;opacity:0;
  border-radius:50%;
  transition:opacity .3s ease;
  will-change:transform;
}
.cursor-dot{
  width:7px;height:7px;margin:-3.5px 0 0 -3.5px;
  background:var(--flame);
  box-shadow:0 0 14px rgba(255,106,43,.75);
}
.cursor-ring{
  width:34px;height:34px;margin:-17px 0 0 -17px;
  border:1px solid rgba(255,106,43,.55);
  box-shadow:inset 0 0 12px rgba(255,106,43,.14);
  transition:width .3s var(--ease),height .3s var(--ease),margin .3s var(--ease),
             opacity .3s ease,border-color .3s ease,background .3s ease;
}
.cursor-ring.big{
  width:64px;height:64px;margin:-32px 0 0 -32px;
  border-color:rgba(255,106,43,.9);
  background:rgba(255,106,43,.10);
}

/* ---------- 颗粒质感 ---------- */
.grain{
  position:fixed;inset:-50%;z-index:9997;
  pointer-events:none;opacity:.038;
  mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.82' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size:180px 180px;
  animation:grainShift 6s steps(6) infinite;
}
@keyframes grainShift{
  0%{transform:translate(0,0)}20%{transform:translate(-3%,2%)}40%{transform:translate(2%,-3%)}
  60%{transform:translate(-2%,-2%)}80%{transform:translate(3%,1%)}100%{transform:translate(0,0)}
}

/* ---------- 右侧滚动导轨 ---------- */
.rail{
  position:fixed;right:22px;top:50%;z-index:90;
  transform:translateY(-50%);
  display:none;flex-direction:column;align-items:center;gap:14px;
  pointer-events:none;
  color:rgba(244,241,234,.5);
  transition:color .4s var(--ease);
}
.rail.on-light{color:rgba(18,20,26,.62)}
.rail-label{
  font-size:10px;letter-spacing:.3em;writing-mode:vertical-rl;
  font-family:"Space Grotesk",sans-serif;
  opacity:.85;
}
.rail-line{width:1px;height:110px;background:currentColor;opacity:.22;position:relative;overflow:hidden}
.rail-line i{
  position:absolute;left:0;top:0;width:100%;height:0;
  background:var(--flame);opacity:1;
}
.rail-idx{
  font-family:"Space Grotesk",sans-serif;font-size:10px;
  letter-spacing:.1em;font-variant-numeric:tabular-nums;
}
.rail-idx em{font-style:normal;opacity:.45}

@media (min-width:1180px){.rail{display:flex}}

/* ---------- 导航升级 ---------- */
.nav{transform:translateY(0);transition:transform .5s var(--ease),background .4s var(--ease),border-color .4s var(--ease)}
.nav.hide{transform:translateY(-102%)}
.nav-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background:transparent;overflow:hidden;
}
.nav-progress i{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--flame),var(--red));
  box-shadow:0 0 12px rgba(255,106,43,.7);
}
.nav.on-light{
  background:rgba(247,244,238,.78);
  backdrop-filter:blur(22px) saturate(170%);
  -webkit-backdrop-filter:blur(22px) saturate(170%);
  border-bottom-color:rgba(18,20,26,.09);
}
.nav.on-light .brand-brush{filter:invert(1)}
.nav.on-light .brand-vai{filter:invert(1) hue-rotate(180deg) saturate(1.15)}
.nav.on-light .brand-sep{background:rgba(18,20,26,.2)}
.nav.on-light .nav-links a{color:rgba(18,20,26,.66)}
.nav.on-light .nav-links a:hover{color:#12141A}
.nav.on-light .menu-btn span{background:#12141A}

/* ---------- 逐字显影 ---------- */
[data-split].reveal{opacity:1;transform:none}
[data-split] .split{display:block}
[data-split] .line{display:block;overflow:hidden;padding-bottom:.1em;margin-bottom:-.1em}
[data-split] .ch{
  display:inline-block;
  transform:translateY(112%);
  opacity:0;
  transition:transform 1s var(--ease-out),opacity .6s var(--ease-out);
  transition-delay:calc(var(--d,0s) + var(--i,0) * .04s);
  will-change:transform;
}
[data-split].in .ch,
.in [data-split] .ch{transform:translateY(0);opacity:1}
.sr{
  position:absolute;width:1px;height:1px;overflow:hidden;
  clip:rect(0,0,0,0);white-space:nowrap;
}

/* ---------- 跑马灯 ---------- */
.marquee{overflow:hidden;width:100%}
.marquee-track{
  display:flex;align-items:center;
  width:max-content;
  will-change:transform;
  backface-visibility:hidden;
}
.strip .marquee-track span{
  padding:0 clamp(18px,2.4vw,34px);
  font-size:13.5px;letter-spacing:.1em;
  color:rgba(244,241,234,.34);
  white-space:nowrap;
}
.strip .marquee-track i{
  width:3px;height:3px;border-radius:50%;
  background:rgba(255,106,43,.5);flex-shrink:0;
}
.strip{padding:22px 0}

/* 巨型字带 */
.wordband{
  position:relative;overflow:hidden;
  background:var(--ink);
  border-top:1px solid rgba(255,255,255,.06);
  padding:clamp(26px,4vw,44px) 0;
}
.wordband::before,.wordband::after{
  content:"";position:absolute;top:0;bottom:0;width:14%;z-index:1;pointer-events:none;
}
.wordband::before{left:0;background:linear-gradient(90deg,var(--ink),transparent)}
.wordband::after{right:0;background:linear-gradient(270deg,var(--ink),transparent)}
.wordband .marquee-track span{
  font-size:clamp(30px,6.4vw,88px);
  font-weight:800;letter-spacing:-.045em;
  color:transparent;
  -webkit-text-stroke:1px rgba(244,241,234,.30);
  padding:0 .22em;white-space:nowrap;
}
.wordband .marquee-track em{
  font-style:normal;
  font-size:clamp(20px,3.4vw,42px);
  color:rgba(255,106,43,.85);
}

/* 页脚字标跑马灯 */
.foot-marquee{
  padding:10px 0 30px;
  border-bottom:1px solid rgba(255,255,255,.07);
  margin-bottom:38px;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 12%,#000 88%,transparent);
  mask-image:linear-gradient(90deg,transparent,#000 12%,#000 88%,transparent);
}
.fm-item{display:inline-flex;align-items:center;gap:clamp(14px,2vw,26px);padding:0 clamp(22px,3vw,44px)}
.fm-item img:first-child{height:clamp(36px,4.6vw,62px);width:auto;opacity:.92}
.fm-item img:last-child{height:clamp(20px,2.6vw,32px);width:auto;opacity:.7}

/* ---------- Hero 增强 ---------- */
.hero-beam{
  position:absolute;inset:0;pointer-events:none;
  background:conic-gradient(from 180deg at 50% 0%,transparent 0deg,rgba(255,106,43,.10) 60deg,transparent 120deg);
  opacity:.5;filter:blur(30px);
}
.eyebrow{display:inline-flex;align-items:center;gap:9px}
.pulse-dot{
  width:6px;height:6px;border-radius:50%;background:var(--green);
  box-shadow:0 0 0 0 rgba(62,207,142,.6);
  animation:pulseDot 2.4s ease infinite;flex-shrink:0;
}
@keyframes pulseDot{
  0%{box-shadow:0 0 0 0 rgba(62,207,142,.55)}
  70%{box-shadow:0 0 0 9px rgba(62,207,142,0)}
  100%{box-shadow:0 0 0 0 rgba(62,207,142,0)}
}
.screen-body{position:relative;overflow:hidden}
.screen-scan{
  position:absolute;left:0;right:0;height:28%;top:-30%;
  background:linear-gradient(180deg,transparent,rgba(255,106,43,.16),transparent);
  animation:scanLine 5.5s ease-in-out infinite;pointer-events:none;
}
@keyframes scanLine{
  0%{top:-30%}55%,100%{top:112%}
}
.float-tag{
  position:absolute;z-index:2;
  font-family:"Space Grotesk",sans-serif;
  font-size:10.5px;letter-spacing:.14em;
  padding:7px 12px;border-radius:999px;
  color:var(--cream);
  background:rgba(12,14,19,.72);
  border:1px solid rgba(255,106,43,.35);
  backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
  box-shadow:0 10px 30px rgba(0,0,0,.45);
  transform:translateZ(40px);
}
.ft-1{left:-14px;top:12%}
.ft-2{right:-10px;bottom:16%;border-color:rgba(62,207,142,.4);color:#9BF0C4}

.badge-scroll{
  position:absolute;right:clamp(20px,4.6vw,54px);bottom:30px;
  width:116px;height:116px;
  display:grid;place-items:center;
  color:rgba(244,241,234,.4);
  transition:color .3s var(--ease);
}
.badge-scroll:hover{color:rgba(255,106,43,.9)}
.badge-scroll svg{position:absolute;inset:0;width:100%;height:100%;animation:spin 26s linear infinite}
.badge-scroll text{
  font-family:"Space Grotesk",sans-serif;font-size:9.4px;
  letter-spacing:.26em;fill:currentColor;
}
.badge-scroll span{font-size:14px;color:var(--flame)}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---------- 3D 倾斜 + 光斑 ---------- */
[data-tilt]{transform-style:preserve-3d;will-change:transform}
.tilt-spot{
  position:absolute;inset:0;border-radius:inherit;
  pointer-events:none;opacity:0;
  transition:opacity .45s var(--ease);
  background:radial-gradient(300px circle at var(--mx,50%) var(--my,50%),rgba(255,106,43,.20),transparent 62%);
  mix-blend-mode:screen;
}
[data-tilt]:hover .tilt-spot{opacity:1}
.section-light .tilt-spot{display:none}
.section-light [data-tilt]:hover{
  box-shadow:0 1px 2px rgba(18,20,26,.05),0 34px 74px -30px rgba(18,20,26,.34),0 0 0 1px rgba(255,106,43,.18);
}

/* ---------- 磁吸按钮 ---------- */
[data-magnetic]{will-change:transform}
[data-magnetic] .m-inner{display:inline-flex;align-items:center;gap:8px}

/* ---------- 横向钉住滚动 ---------- */
.hsec{
  position:relative;
  background:var(--ink);
  color:var(--t1);
}
.hsec-stick{
  position:sticky;top:0;
  height:100vh;height:100svh;
  display:flex;flex-direction:column;justify-content:center;
  overflow:hidden;
  padding-top:var(--nav-h);
  background:
    radial-gradient(60% 55% at 88% 12%,rgba(255,106,43,.10),transparent 62%),
    var(--ink);
}
.hsec-top{padding-bottom:clamp(20px,3vw,34px)}
.hsec-top .sec-head{margin-bottom:0;max-width:760px}
.hsec-top h2{font-size:clamp(30px,4vw,54px)}
.hsec-hud{
  display:flex;align-items:center;gap:20px;
  margin-top:clamp(18px,2.4vw,28px);
}
.hsec-count{
  font-family:"Space Grotesk",sans-serif;
  display:inline-flex;align-items:baseline;gap:6px;
  font-variant-numeric:tabular-nums;
}
.hsec-count b{font-size:15px;color:var(--flame);font-weight:600;letter-spacing:.04em}
.hsec-count em{font-style:normal;font-size:11px;color:var(--t3);letter-spacing:.1em}
.hsec-bar{
  flex:1;max-width:280px;height:1px;
  background:rgba(255,255,255,.12);overflow:hidden;display:block;
}
.hsec-bar i{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--flame),var(--red));
}
.hsec-hint{
  font-family:"Space Grotesk",sans-serif;font-size:10.5px;
  letter-spacing:.22em;color:var(--t3);white-space:nowrap;
}
.hsec-view{
  overflow:hidden;
  padding-inline:clamp(20px,5vw,48px);
  -webkit-mask-image:linear-gradient(90deg,transparent 0,#000 3.5%,#000 96.5%,transparent 100%);
  mask-image:linear-gradient(90deg,transparent 0,#000 3.5%,#000 96.5%,transparent 100%);
}
.hsec-track{
  display:flex;gap:clamp(14px,1.6vw,22px);
  width:max-content;
  will-change:transform;
  padding-block:6px;
}
.hp{
  position:relative;
  flex:0 0 clamp(270px,25vw,368px);
  min-height:clamp(250px,34vh,320px);
  display:flex;flex-direction:column;
  padding:clamp(22px,2.4vw,30px);
  border-radius:var(--radius);
  background:linear-gradient(180deg,rgba(255,255,255,.05),rgba(255,255,255,.015));
  border:1px solid rgba(255,255,255,.09);
  overflow:hidden;
}
.hp::before{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(255,106,43,.06),transparent 55%);
  opacity:0;transition:opacity .4s var(--ease);
}
.hp:hover::before{opacity:1}
.hp-no{
  font-family:"Space Grotesk",sans-serif;
  font-size:clamp(44px,5vw,68px);line-height:1;font-weight:700;
  letter-spacing:-.05em;
  color:transparent;
  -webkit-text-stroke:1px rgba(255,106,43,.55);
  margin-bottom:auto;
}
.hp h3{font-size:clamp(19px,2vw,25px);margin-top:26px;color:var(--cream)}
.hp p{font-size:13.5px;color:var(--t2);margin-top:9px;line-height:1.7;max-width:30ch}
.hp em{
  display:block;margin-top:18px;font-style:normal;
  font-family:"Space Grotesk",sans-serif;
  font-size:11px;letter-spacing:.18em;color:var(--flame);
}
.hp-end{
  background:linear-gradient(160deg,rgba(255,106,43,.16),rgba(255,106,43,.03));
  border-color:rgba(255,106,43,.42);
}
.hp-end .hp-no{color:var(--flame);-webkit-text-stroke:0}
.hp-end h3{font-size:clamp(24px,2.6vw,34px);margin-top:20px}

/* ---------- 章节序号 ---------- */
.k-idx{
  font-family:"Space Grotesk",sans-serif;
  color:var(--flame);margin-right:10px;letter-spacing:.06em;
}
.section-light .k-idx{color:var(--flame)}

/* 联系区标题上限 */
.cta h2{max-width:16ch}
.cta p{text-wrap:pretty}
.sec-sub{text-wrap:pretty}

/* ---------- 响应式 ---------- */
@media (max-width:1080px){
  .badge-scroll{display:none}
  .ft-1,.ft-2{display:none}
}

@media (max-width:900px){
  /* 横向钉住降级为纵向列表 */
  .hsec{height:auto !important}
  .hsec-stick{
    position:static;height:auto;
    padding:clamp(64px,10vw,96px) 0;
    overflow:visible;
  }
  .hsec-view{overflow:visible;padding-inline:clamp(20px,5vw,48px)}
  .hsec-track{
    flex-direction:column;width:auto;
    transform:none !important;
    gap:14px;
  }
  .hp{flex:1 1 auto;min-height:0;padding:22px}
  .hp-no{font-size:38px;margin-bottom:0}
  .hp h3{margin-top:14px}
  .hp p{max-width:none}
  .hsec-hud{display:none}
}

@media (max-width:860px){
  .wordband .marquee-track span{font-size:34px}
  .cursor-dot,.cursor-ring{display:none}
  .intro-mark{width:min(240px,52vw)}
}

@media (max-width:560px){
  .strip{padding:16px 0}
  .foot-marquee{padding:6px 0 22px;margin-bottom:28px}
  .stat b{font-size:46px}
}

@media (prefers-reduced-motion:reduce){
  .cursor-dot,.cursor-ring,.grain{display:none}
  .intro{display:none}
  .badge-scroll svg,.screen-scan,.pulse-dot,.grain{animation:none}
  [data-split] .ch{transform:none;opacity:1;transition:none}
  .hp,.marquee-track,[data-tilt]{transform:none !important}

  /* 关闭动效时不做钉住，直接铺成静态网格，保证内容全部可达 */
  .hsec{height:auto !important}
  .hsec-stick{position:static;height:auto;padding:clamp(64px,8vw,96px) 0;overflow:visible}
  .hsec-view{overflow:visible}
  .hsec-track{flex-wrap:wrap;width:auto !important;gap:16px}
  .hp{flex:1 1 300px;min-height:0}
  .hp-no{font-size:40px;margin-bottom:0}
  .hp h3{margin-top:14px}
  .hsec-hud{display:none}
  .marquee-track{transform:none !important}
}

/* 导航当前段高亮 */
.nav-links a.active{color:var(--t1)}
.nav.on-light .nav-links a.active{color:#12141A}
.nav-links a.active::after{transform:scaleX(1)}

/* 页脚备案号（备案通过后显示） */
.footer-icp{margin-top:8px;font-size:11.5px;letter-spacing:.04em}
.footer-icp a{color:rgba(244,241,234,.42);transition:color .2s var(--ease)}
.footer-icp a:hover{color:var(--flame)}

/* ============================================================
   联系方式（CTA 区 + 页脚）+ 复制提示
   ============================================================ */
button.btn{border:0;font-family:inherit;cursor:pointer;-webkit-appearance:none;appearance:none}

.cta-contact{
  display:flex;flex-wrap:wrap;gap:12px;justify-content:center;
  margin-top:30px;
}
.contact-chip{
  display:inline-flex;align-items:center;gap:10px;
  padding:12px 18px;border-radius:999px;
  border:1px solid rgba(244,241,234,.16);
  background:rgba(244,241,234,.04);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  transition:border-color .22s var(--ease),background .22s var(--ease),transform .22s var(--ease);
}
.contact-chip:hover{
  border-color:rgba(255,106,43,.55);
  background:rgba(255,106,43,.10);
  transform:translateY(-2px);
}
.contact-chip .cc-k{
  font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;
  color:rgba(244,241,234,.42);
}
.contact-chip .cc-v{
  font-size:15.5px;font-weight:600;color:var(--cream);
  letter-spacing:.01em;font-variant-numeric:tabular-nums;
}
.contact-chip .cc-t{
  font-size:11px;letter-spacing:.08em;color:var(--flame);
  padding-left:10px;border-left:1px solid rgba(255,106,43,.28);
}
.contact-chip.is-copied{border-color:rgba(62,207,142,.55);background:rgba(62,207,142,.10)}
.contact-chip.is-copied .cc-t{color:var(--green);border-left-color:rgba(62,207,142,.35)}

.footer-contact{margin-bottom:6px;font-size:12px;color:rgba(244,241,234,.6);letter-spacing:.02em}
.footer-contact a{color:rgba(244,241,234,.6);border-bottom:1px solid rgba(244,241,234,.16);transition:color .2s var(--ease),border-color .2s var(--ease)}
.footer-contact a:hover{color:var(--flame);border-bottom-color:rgba(255,106,43,.5)}

/* 复制成功提示 */
.toast{
  position:fixed;left:50%;bottom:40px;z-index:120;
  transform:translate(-50%,26px);opacity:0;pointer-events:none;
  padding:13px 22px;border-radius:999px;
  background:rgba(16,19,25,.94);
  border:1px solid rgba(255,106,43,.35);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  box-shadow:0 18px 50px rgba(0,0,0,.45);
  color:var(--cream);font-size:14px;letter-spacing:.01em;white-space:nowrap;
  transition:opacity .28s var(--ease),transform .28s var(--ease);
}
.toast.show{opacity:1;transform:translate(-50%,0)}

@media (max-width:640px){
  .cta-contact{gap:10px;margin-top:24px}
  .contact-chip{padding:11px 15px;gap:8px}
  .contact-chip .cc-v{font-size:14.5px}
  .contact-chip .cc-t{display:none}
  .toast{bottom:26px;font-size:13px;padding:11px 18px;max-width:calc(100vw - 40px);white-space:normal;text-align:center}
}

@media (prefers-reduced-motion:reduce){
  .contact-chip{transition:none}
  .toast{transition:opacity .01s}
}

/* CTA 说明文字：中文按 52ch 会被挤成两行，放宽一些 */
.cta .cta-inner > p:not(.cta-note){max-width:700px}
@media (max-width:760px){
  .cta .cta-inner > p:not(.cta-note){max-width:92%}
}