/* =========================================================
   make2d — style.css
   纯手写，无任何第三方依赖
   ========================================================= */

/* ---------- tokens ---------- */
:root{
  --bg:#070B14;
  --bg-2:#0B1220;
  --ink:#0B1220;
  --ink-2:#1E2A3F;
  --ink-mut:#5D6E88;
  --text:#E9EFFA;
  --mut:#92A3BE;
  --line-d:rgba(255,255,255,.09);
  --line-d2:rgba(255,255,255,.14);
  --line-l:#E6EBF4;
  --soft:#F6F8FC;
  --accent:#38BDF8;
  --accent-d:#0EA5E9;
  --blue:#2563EB;
  --violet:#6366F1;
  --ok:#34D399;
  --r:14px;
  --r-l:20px;
  --sh-s:0 4px 14px -6px rgba(11,18,32,.14);
  --sh-m:0 18px 40px -22px rgba(11,18,32,.28);
  --sh-l:0 40px 80px -32px rgba(11,18,32,.4);
  --container:1160px;
  --font:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",sans-serif;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Consolas,"Liberation Mono",monospace;
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:98px}
body{
  margin:0;font-family:var(--font);background:var(--bg);color:var(--text);
  font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
h1,h2,h3,h4{margin:0;line-height:1.24;font-weight:700;letter-spacing:.01em}
p{margin:0}
ul,ol,dl,dd{margin:0;padding:0}
li{list-style:none}
svg{display:block}
[hidden]{display:none !important}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.ico{width:18px;height:18px;flex:none;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}

/* ---------- layout ---------- */
.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px}
.container--narrow{max-width:840px}
.sec{position:relative;padding:108px 0}
.sec--light{background:var(--soft);color:var(--ink)}
.sec--dark{background:#080D18;color:var(--text)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  border-radius:12px;font-weight:650;font-size:15px;line-height:1;
  padding:0 20px;height:46px;white-space:nowrap;
  transition:transform .25s cubic-bezier(.2,.7,.3,1),box-shadow .25s,background .25s,color .25s,border-color .25s;
  will-change:transform;
}
.btn--sm{height:38px;padding:0 16px;font-size:14px;border-radius:10px}
.btn--lg{height:52px;padding:0 26px;font-size:16px;border-radius:13px}
.btn--xl{height:58px;padding:0 30px;font-size:16.5px;border-radius:14px}
.btn--primary{
  background:linear-gradient(135deg,#7DE3FC 0%,#38BDF8 45%,#22A9F0 100%);
  color:#04121F;box-shadow:0 10px 24px -10px rgba(56,189,248,.75),inset 0 1px 0 rgba(255,255,255,.45);
}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 16px 32px -12px rgba(56,189,248,.85),inset 0 1px 0 rgba(255,255,255,.5)}
.btn--primary:active{transform:translateY(0)}
.btn--ghost{border:1px solid var(--line-d2);color:var(--text);background:rgba(255,255,255,.03)}
.btn--ghost:hover{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.24);transform:translateY(-2px)}
.btn--outline{border:1px solid rgba(255,255,255,.2);color:var(--text)}
.btn--outline:hover{border-color:rgba(255,255,255,.4);background:rgba(255,255,255,.06);transform:translateY(-2px)}
.btn .ico{width:17px;height:17px}
.btn--xl .ico{width:19px;height:19px}

/* ---------- nav ---------- */
.nav{
  position:sticky;top:0;z-index:60;
  background:transparent;border-bottom:1px solid transparent;
  transition:background .35s,border-color .35s,backdrop-filter .35s;
}
.nav.is-scrolled{
  background:rgba(7,11,20,.78);
  -webkit-backdrop-filter:saturate(160%) blur(16px);
  backdrop-filter:saturate(160%) blur(16px);
  border-bottom-color:var(--line-d);
}
.nav__in{display:flex;align-items:center;gap:28px;height:78px}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:750;letter-spacing:-.01em}
.brand__mark{
  width:38px;height:38px;border-radius:11px;display:grid;place-items:center;
  background:linear-gradient(145deg,rgba(56,189,248,.22),rgba(99,102,241,.18));
  border:1px solid rgba(125,211,252,.32);color:var(--accent);
  box-shadow:0 4px 14px -6px rgba(56,189,248,.6);
}
.brand__mark svg{width:24px;height:24px}
.brand__name{font-size:21.5px;letter-spacing:-.015em}
.nav__links{display:flex;align-items:center;gap:4px;margin-left:auto}
.nav__links a{
  font-size:14.5px;color:#A9B8CF;padding:8px 12px;border-radius:9px;
  transition:color .2s,background .2s;
}
.nav__links a:hover{color:#fff;background:rgba(255,255,255,.06)}
.nav__cta{display:flex;align-items:center;gap:10px}
.nav__burger{display:none;width:40px;height:40px;border-radius:10px;border:1px solid var(--line-d2);align-items:center;justify-content:center}
.nav__burger .ico{width:20px;height:20px}

/* ---------- hero ---------- */
.hero{position:relative;padding:74px 0 96px;overflow:hidden}
.hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(125,211,252,.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(125,211,252,.045) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(ellipse 80% 60% at 50% 0%,#000 20%,transparent 78%);
  -webkit-mask-image:radial-gradient(ellipse 80% 60% at 50% 0%,#000 20%,transparent 78%);
}
.hero__glow{
  position:absolute;top:-320px;left:50%;transform:translateX(-50%);
  width:1100px;height:760px;pointer-events:none;
  background:
    radial-gradient(closest-side,rgba(56,189,248,.20),transparent 70%),
    radial-gradient(closest-side at 70% 40%,rgba(99,102,241,.18),transparent 70%);
  filter:blur(20px);
}
.hero__grid{
  position:relative;display:grid;grid-template-columns:minmax(0,1.02fr) minmax(0,1fr);
  gap:56px;align-items:center;
}
.hero h1{
  margin:0;font-size:clamp(34px,4.2vw,56px);letter-spacing:-.015em;line-height:1.16;
  font-weight:800;
}
.hl{
  background:linear-gradient(100deg,#7DE3FC,#38BDF8 40%,#818CF8);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero h1 .hl{display:block}
.sec--light .hl{background:linear-gradient(100deg,#2563EB,#0EA5E9 60%,#6366F1);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero__sub{margin:20px 0 0;font-size:16.5px;line-height:1.85;color:var(--mut);max-width:540px}
.hero__actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.hero__ticks{display:flex;flex-wrap:wrap;gap:18px;margin-top:26px;font-size:13.5px;color:#8397B4}
.hero__ticks li{display:flex;align-items:center;gap:6px}
.hero__ticks .ico{width:14px;height:14px;stroke-width:2.4;color:var(--ok)}

.hero__visual{position:relative;perspective:1600px}
.hero__visual::after{
  content:"";position:absolute;left:8%;right:8%;bottom:-38px;height:70px;
  background:radial-gradient(closest-side,rgba(56,189,248,.35),transparent 75%);
  filter:blur(18px);pointer-events:none;
}

/* ---------- 首屏截图 ---------- */
.hero__visual{position:relative}
.hero__shot{position:relative;animation:shotFloat 9s ease-in-out infinite}
@keyframes shotFloat{
  0%,100%{transform:translateY(0)}
  50%{transform:translateY(-9px)}
}
.hero__frame{
  position:relative;border-radius:15px;overflow:hidden;
  border:1px solid rgba(255,255,255,.13);background:#1A1A1A;
  box-shadow:
    0 50px 90px -42px rgba(0,0,0,.92),
    0 0 0 1px rgba(255,255,255,.04) inset,
    0 0 130px -46px rgba(56,189,248,.6);
  transition:transform .5s cubic-bezier(.2,.7,.3,1),box-shadow .5s;
}
.hero__frame:hover{
  transform:scale(1.012);
  box-shadow:0 60px 100px -42px rgba(0,0,0,.96),0 0 160px -42px rgba(56,189,248,.75);
}
.hero__frame picture{display:block}
.hero__frame img{width:100%;height:auto;display:block}
.hero__sheen{
  position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(104deg,transparent 40%,rgba(255,255,255,.075) 49%,rgba(255,255,255,.015) 55%,transparent 64%);
  transform:translateX(-130%);
  animation:sheen 9.5s ease-in-out infinite;
}
@keyframes sheen{
  0%,58%{transform:translateX(-130%)}
  82%,100%{transform:translateX(130%)}
}
.hero__chip{
  position:absolute;z-index:2;display:inline-flex;align-items:center;gap:6px;
  padding:7px 12px;border-radius:999px;white-space:nowrap;
  font-size:12px;font-weight:600;color:#DDF1FF;
  background:rgba(9,16,29,.88);border:1px solid rgba(56,189,248,.32);
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  box-shadow:0 16px 30px -16px rgba(0,0,0,.85),0 0 0 1px rgba(255,255,255,.03) inset;
}
.hero__chip .ico{width:13px;height:13px;stroke-width:2.6;color:#4ADE80}
.hero__chip--a{left:-18px;bottom:-14px;animation:chipFloat 7s ease-in-out infinite}
.hero__chip--b{right:-12px;top:-15px;animation:chipFloat 8.5s ease-in-out infinite reverse}
.hero__chip--b .ico{color:#7DE3FC}
@keyframes chipFloat{
  0%,100%{transform:translateY(0)}
  50%{transform:translateY(-7px)}
}

/* ---------- 官方交流群 ---------- */
.qband{padding:4px 0 80px;background:var(--bg)}
.qband__card{
  display:flex;align-items:center;gap:26px;flex-wrap:wrap;
  padding:20px 24px;border-radius:20px;
  background:linear-gradient(118deg,rgba(255,255,255,.06),rgba(255,255,255,.016));
  border:1px solid rgba(255,255,255,.1);
  box-shadow:0 30px 60px -42px rgba(0,0,0,.9),inset 0 1px 0 rgba(255,255,255,.05);
}
.qband__intro{display:flex;align-items:center;gap:14px;min-width:0;flex:1 1 280px}
.qband__ico{
  width:46px;height:46px;flex:none;border-radius:13px;display:grid;place-items:center;
  background:linear-gradient(150deg,rgba(18,183,245,.28),rgba(18,183,245,.07));
  border:1px solid rgba(18,183,245,.34);
  box-shadow:0 0 26px -8px rgba(18,183,245,.55);
}
.qband__ico svg{width:26px;height:26px;fill:#8FE0FF}
.qband__txt{display:flex;flex-direction:column;gap:2px;min-width:0}
.qband__txt b{font-size:16.5px;letter-spacing:.01em;color:#EAF4FF}
.qband__txt span{font-size:12.5px;color:#8397B4}
.qband__list{display:flex;gap:12px;margin-left:auto;flex-wrap:wrap}
.qitem{
  position:relative;display:flex;align-items:center;gap:11px;
  width:250px;padding:11px 13px 11px 12px;border-radius:13px;
  background:rgba(255,255,255,.045);border:1px solid rgba(255,255,255,.1);
  transition:transform .22s,background .22s,border-color .22s,box-shadow .22s;
}
.qitem:hover{
  background:rgba(18,183,245,.1);border-color:rgba(18,183,245,.38);
  transform:translateY(-2px);box-shadow:0 16px 30px -18px rgba(18,183,245,.6);
}
.qitem__badge{
  width:24px;height:24px;flex:none;border-radius:8px;display:grid;place-items:center;
  font-size:12px;font-weight:750;color:#9FE1FB;
  background:rgba(18,183,245,.16);border:1px solid rgba(18,183,245,.28);
}
.qitem__link{display:flex;flex-direction:column;gap:1px;flex:1;min-width:0}
.qitem__link::after{content:"";position:absolute;inset:0;border-radius:13px}
.qitem__link em{font-style:normal;font-size:11px;letter-spacing:.04em;color:#7B8FAB}
.qitem__link b{
  font-family:var(--mono);font-size:17px;font-weight:700;letter-spacing:.02em;
  color:#EAF4FF;line-height:1.25;transition:color .2s;
}
.qitem:hover .qitem__link b{color:#9FE1FB}
.qitem__join{
  position:relative;z-index:1;display:inline-flex;align-items:center;gap:2px;flex:none;
  font-size:11.5px;color:#7DE3FC;opacity:0;transform:translateX(-5px);
  transition:opacity .22s,transform .22s;
}
.qitem:hover .qitem__join{opacity:1;transform:none}
.qitem__join .ico{width:12px;height:12px}
.qitem__copy{
  position:relative;z-index:1;width:28px;height:28px;flex:none;border-radius:8px;
  display:grid;place-items:center;color:#6E82A0;transition:.18s;
}
.qitem__copy:hover{background:rgba(255,255,255,.09);color:#7DE3FC}
.qitem__copy .ico{width:15px;height:15px}

/* ---------- section head ---------- */
.sec__head{max-width:640px;margin-bottom:52px}
.sec__head--center{margin-left:auto;margin-right:auto;text-align:center}
.eyebrow{
  display:inline-block;font-size:12.5px;font-weight:700;letter-spacing:.16em;
  text-transform:uppercase;color:var(--accent-d);margin-bottom:14px;
}
.sec--dark .eyebrow{color:#7DE3FC}
.sec__head h2{font-size:clamp(26px,3.1vw,38px);letter-spacing:-.012em;line-height:1.28}
.sec__head p{margin-top:16px;font-size:15.5px;line-height:1.85;color:#61738D}
.sec--dark .sec__head p{color:#8FA0BD}

/* ---------- feature cards ---------- */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;grid-auto-rows:1fr}
.card{
  background:#fff;border:1px solid var(--line-l);border-radius:var(--r-l);
  padding:30px 26px;box-shadow:0 1px 2px rgba(11,18,32,.03);
  transition:transform .35s cubic-bezier(.2,.7,.3,1),box-shadow .35s,border-color .35s;
}
.card:hover{
  transform:translateY(-5px);border-color:#CFE3FB;
  box-shadow:0 28px 50px -30px rgba(37,99,235,.4),0 2px 6px rgba(11,18,32,.04);
}
.card__ico{
  width:46px;height:46px;border-radius:13px;display:grid;place-items:center;
  background:linear-gradient(150deg,#EFF6FF,#E0F2FE 60%,#EDE9FE);
  color:#2563EB;margin-bottom:20px;
  box-shadow:inset 0 0 0 1px rgba(37,99,235,.08);
}
.card__ico .ico{width:21px;height:21px;stroke-width:1.7}
.card h3{font-size:17.5px;letter-spacing:-.005em}
.card p{margin-top:10px;font-size:14px;line-height:1.8;color:#5E7089}

/* ---------- shots ---------- */
.shots{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:18px}
.shot{margin:0}
.shot__ph{
  position:relative;min-height:120px;border-radius:14px;overflow:hidden;
  border:1px solid rgba(255,255,255,.1);
  background:
    radial-gradient(120% 90% at 50% 0%,rgba(56,189,248,.14),transparent 65%),
    linear-gradient(180deg,#0D1626,#080E1A);
  display:grid;place-items:center;
  box-shadow:0 24px 50px -34px rgba(0,0,0,.9);
  transition:transform .35s,border-color .35s;
}
.shot:hover .shot__ph{transform:translateY(-4px);border-color:rgba(56,189,248,.34)}
.shot__ph::before{
  content:"";position:absolute;inset:0;
  background-image:
    linear-gradient(rgba(125,211,252,.06) 1px,transparent 1px),
    linear-gradient(90deg,rgba(125,211,252,.06) 1px,transparent 1px);
  background-size:22px 22px;
  mask-image:radial-gradient(ellipse at 50% 50%,#000 30%,transparent 85%);
  -webkit-mask-image:radial-gradient(ellipse at 50% 50%,#000 30%,transparent 85%);
}
.shot__ph span{
  position:relative;font-size:12.5px;font-weight:600;letter-spacing:.1em;
  color:#8AA6C4;text-transform:uppercase;padding:7px 14px;border-radius:999px;
  background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.1);
}
.shot__ph .ph-svg{position:absolute;inset:0;width:100%;height:100%;z-index:1}
.shot__ph img{position:relative;z-index:1;width:100%;height:auto;display:block}
.shot figcaption{
  margin-top:14px;font-size:13.5px;color:#8598B5;text-align:center;
}

/* ---------- steps ---------- */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;counter-reset:s}
.step{
  position:relative;padding:30px 26px;border-radius:var(--r-l);
  background:#fff;border:1px solid var(--line-l);
}
.step__n{
  display:inline-block;font-family:var(--mono);font-size:12.5px;font-weight:700;
  color:#2563EB;letter-spacing:.08em;margin-bottom:14px;
  padding:4px 9px;border-radius:7px;background:#EFF6FF;
}
.step h3{font-size:17px}
.step p{margin-top:9px;font-size:14px;line-height:1.8;color:#5E7089}
.step::after{
  content:"";position:absolute;top:50%;right:-11px;width:20px;height:1px;
  background:linear-gradient(90deg,#CBD5E1,transparent);
}
.step:last-child::after{display:none}

/* ---------- download ---------- */
.sec--dl{
  background:
    radial-gradient(900px 420px at 20% 0%,rgba(56,189,248,.13),transparent 65%),
    radial-gradient(700px 400px at 90% 100%,rgba(99,102,241,.13),transparent 65%),
    linear-gradient(180deg,#0A1220,#070B14);
  padding:104px 0;
}
.dl{
  display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,.65fr);gap:20px;
  border-radius:26px;padding:0;
}
.dl__main{
  padding:46px 44px;border-radius:24px;
  background:linear-gradient(155deg,rgba(255,255,255,.055),rgba(255,255,255,.018));
  border:1px solid rgba(255,255,255,.11);
  box-shadow:0 40px 80px -46px rgba(0,0,0,.95),inset 0 1px 0 rgba(255,255,255,.06);
}
.dl__main h2{font-size:clamp(26px,3vw,36px);margin-top:10px}
.dl__sub{margin-top:12px;color:#8FA0BD;font-size:15px}
.dl__meta{
  display:grid;grid-template-columns:1fr 1fr;gap:14px 20px;margin:30px 0 32px;
  padding:22px 0;border-top:1px solid rgba(255,255,255,.08);border-bottom:1px solid rgba(255,255,255,.08);
}
.dl__meta div{display:flex;flex-direction:column;gap:2px}
.dl__meta span{font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;color:#6E82A0}
.dl__meta b{font-size:14.5px;font-weight:650;color:#E4EEFB}
.dl__actions{display:flex;flex-wrap:wrap;gap:12px}
.dl__code{margin-top:14px;font-size:13.5px;color:#9FB3CE;font-family:var(--mono)}
.dl__code b{color:#7DE3FC}
.dl__note{
  display:flex;gap:9px;margin-top:24px;font-size:12.8px;line-height:1.75;color:#75889F;
}
.dl__note .ico{width:15px;height:15px;margin-top:3px;color:var(--ok);stroke-width:2.4}
.dl__side{
  padding:38px 30px;border-radius:24px;
  background:rgba(255,255,255,.026);border:1px solid rgba(255,255,255,.08);
}
.dl__side h3{font-size:14px;letter-spacing:.06em;color:#A9BBD3;margin-bottom:22px}
.timeline{position:relative;padding-left:18px}
.timeline::before{
  content:"";position:absolute;left:3px;top:6px;bottom:6px;width:1px;
  background:linear-gradient(180deg,rgba(56,189,248,.6),rgba(255,255,255,.07));
}
.tl{position:relative;padding-bottom:22px}
.tl:last-child{padding-bottom:0}
.tl__dot{
  position:absolute;left:-18px;top:7px;width:7px;height:7px;border-radius:50%;
  background:var(--accent);box-shadow:0 0 0 3px rgba(56,189,248,.16);
}
.tl b{display:block;font-size:13.5px;color:#E4EEFB;font-family:var(--mono)}
.tl b em{font-style:normal;color:#6E82A0;font-weight:400;margin-left:8px;font-size:12px}
.tl ul{margin-top:8px;display:flex;flex-direction:column;gap:5px}
.tl li{position:relative;padding-left:11px;font-size:12.8px;line-height:1.7;color:#8FA0BD}
.tl li::before{content:"";position:absolute;left:0;top:9px;width:3px;height:3px;border-radius:50%;background:#506280}

/* ---------- faq ---------- */
.faq{display:flex;flex-direction:column;gap:10px}
.faq details{
  border:1px solid var(--line-l);border-radius:13px;background:#fff;
  overflow:hidden;transition:border-color .25s,box-shadow .25s;
}
.faq details[open]{border-color:#CFE3FB;box-shadow:var(--sh-s)}
.faq summary{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:19px 22px;font-size:15.5px;font-weight:650;color:var(--ink);cursor:pointer;
  list-style:none;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary .ico{width:17px;height:17px;color:#8FA3BC;transition:transform .3s,color .3s}
.faq details[open] summary .ico{transform:rotate(180deg);color:var(--blue)}
.faq details p{
  padding:0 22px 21px;font-size:14.2px;line-height:1.85;color:#5E7089;
}

/* ---------- footer ---------- */
.foot{background:#050810;border-top:1px solid rgba(255,255,255,.07);padding:56px 0 26px}
.foot__in{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:32px;align-items:start}
.foot__brand p{margin-top:14px;font-size:13.5px;color:#74879F;max-width:300px;line-height:1.8}
.foot__links{display:flex;flex-direction:column;gap:10px;font-size:14px;color:#8FA0BD}
.foot__links a:hover{color:#fff}
.foot__contact{display:flex;flex-direction:column;gap:10px;align-items:flex-start}
.foot__mail{display:inline-flex;align-items:center;gap:8px;font-size:14px;color:#9FB3CE}
.foot__mail:hover{color:#7DE3FC}
.foot__qq{font-size:13.5px;color:#74879F}
.foot__bottom{
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  margin-top:44px;padding-top:22px;border-top:1px solid rgba(255,255,255,.06);
  font-size:12.5px;color:#5D6E88;
}

.foot__groups{display:flex;flex-direction:column;gap:6px;margin-top:6px}
.foot__gtitle{font-size:11px;letter-spacing:.14em;color:#586A86}
.foot__group{display:inline-flex;align-items:center;gap:7px;font-size:13px;color:#9FB3CE;width:fit-content;transition:color .2s}
.foot__group em{font-style:normal;font-size:12px;color:#74879F}
.foot__group b{font-family:var(--mono);font-weight:600;color:#C7D9EE;letter-spacing:.02em;transition:color .2s}
.foot__group:hover b{color:#7DE3FC}

/* ---------- 右侧悬浮 QQ 群 ---------- */
.qqdock{
  position:fixed;right:12px;top:50%;transform:translateY(-50%);z-index:55;
  display:flex;flex-direction:column;gap:10px;
  animation:qqIn .7s .9s cubic-bezier(.2,.7,.3,1) both;
}
.qqdock__item{position:relative}
@keyframes qqIn{
  from{opacity:0;transform:translateY(-50%) translateX(28px)}
  to{opacity:1;transform:translateY(-50%)}
}
.qqdock__tab{
  position:relative;width:54px;padding:13px 0 15px;
  display:flex;flex-direction:column;align-items:center;gap:9px;
  border-radius:15px;border:1px solid rgba(18,183,245,.34);
  background:linear-gradient(165deg,rgba(18,183,245,.26),rgba(11,18,32,.94) 58%);
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  box-shadow:0 18px 40px -20px rgba(0,0,0,.85),0 0 26px -6px rgba(18,183,245,.42),0 0 0 1px rgba(255,255,255,.035) inset;
  transition:border-color .25s,box-shadow .25s,transform .25s;
}
.qqdock__tab:hover{
  border-color:rgba(18,183,245,.7);transform:translateX(-2px);
  box-shadow:0 22px 46px -18px rgba(18,183,245,.5),0 0 0 1px rgba(255,255,255,.06) inset;
}
.qqdock__logo{width:24px;height:24px;fill:#8FE0FF;filter:drop-shadow(0 2px 7px rgba(18,183,245,.55))}
.qqdock__label{
  writing-mode:vertical-rl;text-orientation:upright;
  font-size:12.5px;font-weight:650;letter-spacing:.12em;
  color:#CFE9FB;line-height:1;padding:1px 0;
}
.qqdock__pulse{
  position:absolute;top:-3px;right:-3px;width:9px;height:9px;border-radius:50%;
  background:#22C55E;box-shadow:0 0 0 3px rgba(34,197,94,.2);
}
.qqdock__pulse::after{
  content:"";position:absolute;inset:0;border-radius:50%;background:#22C55E;
  animation:qqPulse 2.2s ease-out infinite;
}
@keyframes qqPulse{0%{transform:scale(1);opacity:.65}70%{transform:scale(2.8);opacity:0}100%{opacity:0}}

.qqdock__tab--video{
  border-color:rgba(251,114,153,.34);
  background:linear-gradient(165deg,rgba(251,114,153,.26),rgba(11,18,32,.94) 58%);
  color:#FFC2D4;
}
.qqdock__tab--video:hover{
  border-color:rgba(251,114,153,.72);transform:translateX(-2px);
  box-shadow:0 22px 46px -18px rgba(251,114,153,.5),0 0 26px -8px rgba(251,114,153,.5),0 0 0 1px rgba(255,255,255,.06) inset;
}
.qqdock__tab--video .qqdock__label{color:#FFD3E0}
.qqdock__logov{
  width:24px;height:24px;fill:none;stroke:currentColor;stroke-width:1.7;
  stroke-linecap:round;stroke-linejoin:round;
  filter:drop-shadow(0 2px 7px rgba(251,114,153,.55));
}

.qqdock__panel{
  position:absolute;right:calc(100% + 12px);top:50%;width:250px;padding:15px;
  border-radius:18px;border:1px solid rgba(18,183,245,.26);
  background:linear-gradient(168deg,rgba(16,26,44,.975),rgba(8,14,26,.975));
  -webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);
  box-shadow:0 34px 70px -28px rgba(0,0,0,.9),0 0 100px -46px rgba(18,183,245,.7);
  transform:translateY(-50%) translateX(12px) scale(.98);
  transform-origin:right center;
  opacity:0;visibility:hidden;pointer-events:none;
  transition:opacity .26s cubic-bezier(.2,.7,.3,1),transform .26s cubic-bezier(.2,.7,.3,1),visibility .26s;
}
.qqdock__panel::after{
  content:"";position:absolute;right:-6px;top:50%;margin-top:-6px;width:11px;height:11px;
  background:#0C1728;border-right:1px solid rgba(18,183,245,.26);border-top:1px solid rgba(18,183,245,.26);
  transform:rotate(45deg);
}
.qqdock__item:hover .qqdock__panel,
.qqdock.is-open .qqdock__panel{
  opacity:1;visibility:visible;pointer-events:auto;
  transform:translateY(-50%) translateX(0) scale(1);
}
.qqdock__head{
  display:flex;flex-direction:column;gap:3px;padding:1px 4px 12px;
  border-bottom:1px solid rgba(255,255,255,.08);margin-bottom:10px;
}
.qqdock__head b{font-size:14px;color:#EAF4FF;letter-spacing:.01em}
.qqdock__head span{font-size:11.5px;color:#8496B0;line-height:1.5}
.qqdock__list{display:flex;flex-direction:column;gap:8px}
.qqcard{
  position:relative;display:flex;align-items:center;gap:10px;padding:10px 10px 10px 11px;border-radius:12px;
  background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.07);transition:.2s;
}
.qqcard:hover{background:rgba(18,183,245,.1);border-color:rgba(18,183,245,.32)}
.qqcard__idx{
  width:22px;height:22px;flex:none;border-radius:7px;display:grid;place-items:center;
  font-size:11px;font-weight:750;color:#9FE1FB;
  background:rgba(18,183,245,.16);border:1px solid rgba(18,183,245,.26);
}
.qqcard__link{flex:1;min-width:0;display:flex;flex-direction:column;gap:1px}
.qqcard__link::after{content:"";position:absolute;inset:0;border-radius:12px}
.qqcard__link em{font-style:normal;font-size:11.5px;color:#7B8FAB;letter-spacing:.02em}
.qqcard__link b{
  font-family:var(--mono);font-size:15px;font-weight:650;color:#EAF4FF;letter-spacing:.015em;line-height:1.3;
  transition:color .2s;
}
.qqcard:hover .qqcard__link b{color:#9FE1FB}
.qqcard__copy{
  position:relative;z-index:1;
  width:28px;height:28px;flex:none;border-radius:8px;display:grid;place-items:center;
  color:#6E82A0;transition:.18s;
}
.qqcard__copy:hover{background:rgba(255,255,255,.09);color:#7DE3FC}
.qqcard__copy .ico{width:15px;height:15px}
.qqdock__tip{margin-top:11px;padding:0 4px;font-size:11.5px;line-height:1.6;color:#7A8DA8}

.copytoast{
  position:fixed;left:50%;bottom:34px;transform:translate(-50%,14px);z-index:80;
  padding:10px 18px;border-radius:10px;font-size:13px;color:#DDF1FF;
  background:rgba(11,18,32,.96);border:1px solid rgba(18,183,245,.3);
  box-shadow:0 20px 40px -16px rgba(0,0,0,.65);
  opacity:0;pointer-events:none;transition:.26s;
}
.copytoast.show{opacity:1;transform:translate(-50%,0)}

/* ---------- 功能演示 ---------- */
.demo{background:#060A12;padding:100px 0 104px;border-top:1px solid rgba(255,255,255,.05)}
.demo .sec__head{max-width:760px}
.demo__wrap{display:grid;grid-template-columns:minmax(0,1.62fr) minmax(0,.88fr);gap:20px;align-items:stretch}
.demo__stage{
  display:flex;flex-direction:column;border-radius:18px;overflow:hidden;
  border:1px solid rgba(255,255,255,.1);background:#0B1220;
  box-shadow:0 40px 80px -46px rgba(0,0,0,.95),0 0 130px -60px rgba(56,189,248,.55);
}
.demo__screen{position:relative;background:#0B1220;flex:1;display:flex;align-items:center}
.demo__img{
  display:block;width:100%;height:auto;
  transition:opacity .3s ease,filter .3s ease;
}
.demo__img.is-loading{opacity:.6;filter:blur(3px)}
.demo__caphead{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.demo__badge{
  display:inline-flex;align-items:center;gap:6px;padding:3px 9px;border-radius:999px;
  font-size:10.5px;font-weight:600;letter-spacing:.04em;color:#9FE1FB;
  background:rgba(56,189,248,.1);border:1px solid rgba(56,189,248,.26);
}
.demo__badge i{width:6px;height:6px;border-radius:50%;background:#4ADE80;animation:qqPulse 2.2s infinite}
.demo__cap{padding:16px 20px 18px;border-top:1px solid rgba(255,255,255,.08);background:rgba(255,255,255,.02)}
.demo__cap b{font-size:15.5px;color:#EAF4FF;letter-spacing:.01em}
.demo__cap p{margin-top:6px;font-size:13px;line-height:1.72;color:#8FA0BD}

.demo__side{display:flex;flex-direction:column;gap:10px;min-width:0}
.demo__list{display:flex;flex-direction:column;gap:8px}
.ditem{
  display:flex;align-items:center;gap:12px;padding:9px 12px 9px 9px;
  border-radius:13px;border:1px solid rgba(255,255,255,.08);
  background:rgba(255,255,255,.03);text-align:left;transition:.2s;
}
.ditem:hover{background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.18)}
.ditem.is-on{
  background:rgba(56,189,248,.11);border-color:rgba(56,189,248,.42);
  box-shadow:0 14px 28px -18px rgba(56,189,248,.75);
}
.ditem__thumb{
  width:86px;height:54px;flex:none;border-radius:8px;overflow:hidden;
  background:#0B1220;border:1px solid rgba(255,255,255,.08);
}
.ditem__thumb img{width:100%;height:100%;object-fit:cover;display:block}
.ditem__txt{display:flex;flex-direction:column;gap:2px;min-width:0}
.ditem__txt em{font-style:normal;font-family:var(--mono);font-size:10.5px;letter-spacing:.1em;color:#6E82A0}
.ditem__txt b{font-size:13.5px;font-weight:650;color:#C6D5E8;line-height:1.3;transition:color .2s}
.ditem.is-on .ditem__txt b{color:#fff}
.ditem__arrow{width:15px;height:15px;margin-left:auto;flex:none;color:#5D6E88;opacity:0;transform:translateX(-4px);transition:.2s}
.ditem.is-on .ditem__arrow{opacity:1;transform:none;color:#7DE3FC}

.demo__cta{
  margin-top:auto;display:flex;align-items:center;gap:12px;
  padding:14px 16px;border-radius:14px;
  border:1px solid rgba(251,114,153,.28);
  background:linear-gradient(120deg,rgba(251,114,153,.14),rgba(251,114,153,.04));
  transition:.22s;
}
.demo__cta:hover{border-color:rgba(251,114,153,.6);background:linear-gradient(120deg,rgba(251,114,153,.22),rgba(251,114,153,.06));transform:translateY(-2px)}
.demo__ctaico{
  width:34px;height:34px;flex:none;border-radius:10px;display:grid;place-items:center;
  background:rgba(251,114,153,.18);color:#FFB3C9;border:1px solid rgba(251,114,153,.32);
}
.demo__ctaico .ico{width:18px;height:18px}
.demo__ctatxt{display:flex;flex-direction:column;gap:2px;min-width:0}
.demo__ctatxt b{font-size:13.5px;color:#FFE1EA}
.demo__ctatxt em{font-style:normal;font-size:11.5px;color:#A98CA0}
.demo__ctaarrow{width:15px;height:15px;margin-left:auto;flex:none;color:#FB7299}

.foot__tut{display:inline-flex;align-items:center;gap:7px;font-size:13px;color:#9FB3CE;width:fit-content;transition:color .2s}
.foot__tut .ico{width:15px;height:15px;color:#FB7299}
.foot__tut:hover{color:#fff}

/* ---------- reveal ---------- */
.reveal{transition:opacity .7s cubic-bezier(.2,.7,.3,1),transform .7s cubic-bezier(.2,.7,.3,1)}
html.motion .reveal:not(.is-in){opacity:0;transform:translateY(22px)}
.hero__copy>*{animation:rise .8s cubic-bezier(.2,.7,.3,1) both}
.hero__copy>*:nth-child(1){animation-delay:.05s}
.hero__copy>*:nth-child(2){animation-delay:.12s}
.hero__copy>*:nth-child(3){animation-delay:.19s}
.hero__copy>*:nth-child(4){animation-delay:.26s}
.hero__copy>*:nth-child(5){animation-delay:.33s}
.hero__visual{animation:rise .9s .2s cubic-bezier(.2,.7,.3,1) both}
@keyframes rise{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}

/* ---------- responsive ---------- */
@media (max-width:1279px){
  .qqdock{display:none}
}
@media (max-width:1024px){
  .hero__grid{grid-template-columns:1fr;gap:44px}
  .hero{padding:52px 0 80px}
  .hero__sub{max-width:none}
  .hero__visual{max-width:620px;margin:0 auto;width:100%}
  .cards,.steps{grid-template-columns:repeat(2,1fr)}
  .qband__intro{flex:1 1 100%}
  .qband__list{margin-left:0;width:100%}
  .demo__wrap{grid-template-columns:1fr;gap:16px}
  .demo__side{gap:12px}
  .dl{grid-template-columns:1fr}
  .step::after{display:none}
  .sec{padding:84px 0}
}
@media (max-width:820px){
  .nav__links{
    position:absolute;left:16px;right:16px;top:64px;
    flex-direction:column;align-items:stretch;gap:2px;
    padding:10px;border-radius:16px;
    background:#0A101C;border:1px solid var(--line-d);
    box-shadow:0 30px 60px -20px rgba(0,0,0,.8);
    opacity:0;visibility:hidden;transform:translateY(-8px);
    transition:.25s;
  }
  .nav__links a{padding:12px 14px;font-size:15px}
  .nav.is-open .nav__links{opacity:1;visibility:visible;transform:none}
  .nav__burger{display:inline-flex}
  .nav__cta .btn--sm{display:none}
  .foot__in{grid-template-columns:1fr 1fr}
  .foot__brand{grid-column:1/-1}
}
@media (max-width:640px){
  .container{padding:0 18px}
  .sec{padding:68px 0}
  .sec__head{margin-bottom:36px}
  .hero{padding:38px 0 64px}
  .hero h1{font-size:clamp(28px,8vw,38px)}
  .hero__sub{font-size:15px}
  .hero__actions .btn{flex:1 1 auto}
  .btn--lg{height:50px;padding:0 20px}
  .cards,.steps{grid-template-columns:1fr}
  .card{padding:24px 22px}
  .hero__chip{display:none}
  .qband{padding:0 0 58px}
  .qband__card{padding:18px 16px;border-radius:16px;gap:16px}
  .qband__list{flex-direction:column;gap:10px}
  .qitem{width:100%}
  .qitem__join{opacity:1;transform:none}
  .demo{padding:72px 0 76px}
  .demo__cap{padding:14px 16px 16px}
  .ditem__thumb{width:72px;height:45px}
  .dl__main{padding:30px 22px;border-radius:20px}
  .dl__side{padding:26px 22px;border-radius:20px}
  .dl__meta{grid-template-columns:1fr;gap:12px}
  .dl__actions{flex-direction:column;align-items:stretch}
  .dl__actions .btn{width:100%}
  .faq summary{padding:16px 18px;font-size:14.5px}
  .faq details p{padding:0 18px 18px;font-size:13.8px}
  .foot__in{grid-template-columns:1fr}
  .foot__bottom{flex-direction:column;gap:8px}
}

@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important}
  html{scroll-behavior:auto}
  html.motion .reveal:not(.is-in){opacity:1;transform:none}
}

/* ---------- print / no-js ---------- */
@media print{.nav,.hero__glow{display:none}}