/* ── Tokens ── */
:root{
  --bg:#06080c;--bg-2:#0b0e14;--surface:#0f131a;--surface-2:#141922;
  --line:rgba(255,255,255,.08);--line-2:rgba(255,255,255,.14);--dev:rgba(203,213,225,.32);
  --t1:#f3f5f8;--t2:rgba(243,245,248,.74);--t3:rgba(243,245,248,.54);--t4:rgba(243,245,248,.38);
  --accent:#1668dc;--accent-2:#3b82f6;--accent-3:#60a5fa;
  --r-sm:8px;--r-md:14px;--r-lg:22px;
  --container:1200px;--gutter:32px;
  --font:-apple-system,BlinkMacSystemFont,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei","Helvetica Neue",sans-serif;
  --fs-h1:clamp(28px,9.6vw,76px);--fs-lead:clamp(16px,1.5vw,20px);
}
@media(max-width:768px){:root{--gutter:20px}}

*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--font);background:var(--bg);color:var(--t2);line-height:1.7;overflow-x:hidden;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
a:focus-visible{outline:2px solid var(--accent-3);outline-offset:3px;border-radius:6px}
.container{max-width:var(--container);margin:0 auto;padding:0 var(--gutter)}

/* ── Nav ── */
.nav{position:sticky;top:0;z-index:50;background:rgba(6,8,12,.7);backdrop-filter:saturate(1.4) blur(14px);-webkit-backdrop-filter:saturate(1.4) blur(14px);border-bottom:1px solid var(--line)}
.nav .container{display:flex;align-items:center;height:64px;gap:24px}
.brand{display:flex;align-items:center;gap:10px;color:var(--t1);font-weight:600;font-size:16px;letter-spacing:.5px}
.brand-mk{width:28px;height:28px;border-radius:8px;display:grid;place-items:center;font-size:15px;color:#fff;background:linear-gradient(140deg,#2b7fe8,#0f4fb0);box-shadow:inset 0 1px 0 rgba(255,255,255,.25)}
.nav-cta{margin-left:auto}

/* ── Buttons ── */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:48px;padding:0 28px;border-radius:10px;font-size:16px;font-weight:600;letter-spacing:.5px;white-space:nowrap;transition:transform .2s,box-shadow .2s,background .2s}
.btn-primary{color:#fff;background:linear-gradient(180deg,#2b7fe8,#1259c4);border:1px solid rgba(255,255,255,.16);box-shadow:0 10px 30px rgba(22,104,220,.38),inset 0 1px 0 rgba(255,255,255,.22)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 14px 38px rgba(22,104,220,.5),inset 0 1px 0 rgba(255,255,255,.22)}
.btn-sm{height:36px;padding:0 16px;font-size:14px;border-radius:8px}

/* ── Hero ── */
.hero{position:relative;padding:88px 0 0;overflow:hidden;isolation:isolate}
.hero::before{content:'';position:absolute;z-index:-1;left:50%;top:420px;width:1400px;max-width:160%;height:900px;transform:translateX(-50%);background:radial-gradient(closest-side,rgba(22,104,220,.24),rgba(22,104,220,.07) 55%,transparent);filter:blur(10px);pointer-events:none}
.hero::after{content:'';position:absolute;z-index:-1;inset:0;background:linear-gradient(rgba(255,255,255,.03) 1px,transparent 1px) 0 0/100% 64px;mask-image:linear-gradient(180deg,#000,transparent 60%);-webkit-mask-image:linear-gradient(180deg,#000,transparent 60%);pointer-events:none}
.hero-copy{text-align:center;max-width:880px;margin:0 auto}
.caps{display:flex;align-items:center;justify-content:center;gap:16px}
.cap{display:inline-flex;align-items:center;height:48px;padding:0 26px;border-radius:999px;border:1px solid rgba(59,130,246,.4);background:rgba(59,130,246,.1);color:#cfe1ff;font-size:19px;font-weight:600;letter-spacing:3px;box-shadow:0 0 24px rgba(59,130,246,.15),inset 0 1px 0 rgba(255,255,255,.06)}
.caps .x{font-style:normal;font-size:24px;font-weight:300;color:var(--accent-3)}
.h1{margin:26px 0 22px;font-size:var(--fs-h1);line-height:1.2;font-weight:700;color:var(--t1);letter-spacing:.04em}
.h1 .grad{background:linear-gradient(90deg,#9cc4ff,#3b82f6 60%,#1668dc);-webkit-background-clip:text;background-clip:text;color:transparent}
.lead{font-size:var(--fs-lead);color:var(--t2);max-width:720px;margin:0 auto;text-wrap:balance}
.lead .br{display:block}
.nb{display:inline-block;font-style:normal}
.coverage{margin-top:28px;font-size:13px;color:var(--t3);letter-spacing:1px}
.coverage b{font-weight:500;color:var(--t2)}

/* ── Device stage (line art) ── */
.stage{position:relative;max-width:1040px;margin:72px auto 0;padding:0 var(--gutter)}
.stage-inner{position:relative;width:100%;aspect-ratio:1040/590}
.laptop{position:absolute;left:2%;top:0;width:78%}
.scr{aspect-ratio:16/10;padding:1.4%;border:1.5px solid var(--dev);border-bottom:0;border-radius:16px 16px 0 0;background:rgba(255,255,255,.012)}
.scr-in{position:relative;height:100%;border:1px solid var(--line);border-radius:6px;overflow:hidden;background:linear-gradient(180deg,rgba(15,19,26,.7),rgba(8,10,14,.7))}
.base{position:relative;margin:0 -7%;height:0;padding-bottom:3.4%;border:1.5px solid var(--dev);border-radius:2px 2px 14px 14px/2px 2px 50% 50%}
.base::before{content:'';position:absolute;left:50%;top:-1.5px;width:14%;height:45%;transform:translateX(-50%);border:1.5px solid var(--dev);border-top:0;border-radius:0 0 8px 8px}
.phone{position:absolute;right:2%;top:16%;width:22%;aspect-ratio:9/19;padding:3.6%;border:1.5px solid var(--dev);border-radius:18%/8.5%;background:var(--bg);box-shadow:0 30px 80px rgba(0,0,0,.65)}
.phone-in{position:relative;height:100%;border:1px solid var(--line);border-radius:13%/6.2%;overflow:hidden;background:linear-gradient(180deg,rgba(15,19,26,.8),rgba(8,10,14,.8))}
.notch{position:absolute;left:50%;top:5.4%;width:28%;height:3.2%;transform:translateX(-50%);border:1.5px solid var(--dev);border-radius:999px;background:var(--bg)}
.scr-in svg,.phone-in svg{position:absolute;inset:0;width:100%;height:100%}
.bi{filter:drop-shadow(0 0 6px rgba(59,130,246,.55))}

/* ── Entrance & draw animation (plays once on load) ── */
.stage .laptop,.stage .phone{opacity:0;transform:translateY(24px)}
.play .laptop{animation:rise 1s cubic-bezier(.16,1,.3,1) .15s forwards}
.play .phone{animation:rise 1.1s cubic-bezier(.16,1,.3,1) .45s forwards}
.stage .px,.stage .bi,.stage .seg{stroke-dasharray:1;stroke-dashoffset:1}
.play .px{animation:draw 1.6s ease .8s forwards}
.stage .zs,.stage .bd,.stage .row{opacity:0}
.play .row{animation:fade .8s ease 1.2s forwards}
.play .zs{animation:fade .8s ease 1.9s forwards}
.play .bi{animation:draw 1.6s cubic-bezier(.45,0,.2,1) 2.1s forwards}
.play .seg{animation:draw 1.2s ease 3.1s forwards}
.play .bd{animation:fade .6s ease 3.5s forwards}
@keyframes rise{to{opacity:1;transform:none}}
@keyframes fade{to{opacity:1}}
@keyframes draw{to{stroke-dashoffset:0}}

/* ── Sections ── */
.sec{padding:120px 0 0}
.sec-head{text-align:center;max-width:760px;margin:0 auto 56px}
.sec-head.left{text-align:left;margin:0 0 36px}
.eyebrow{font-size:14px;font-weight:600;letter-spacing:2px;color:var(--accent-3)}
.h2{margin-top:14px;font-size:clamp(24px,3.4vw,40px);line-height:1.3;font-weight:700;color:var(--t1);letter-spacing:.02em}
.sec-sub{margin-top:16px;font-size:var(--fs-lead);color:var(--t3);text-wrap:balance}
.frame-tag{display:inline-flex;align-items:center;height:22px;padding:0 8px;border-radius:6px;font-size:12px;color:var(--t4);border:1px solid var(--line);white-space:nowrap}
.nav-links{display:flex;gap:28px;margin-left:auto;font-size:14px;color:var(--t3)}
.nav-links a:hover{color:var(--t1)}
.nav-links+.nav-cta{margin-left:8px}

/* pains */
.pains{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.pain{padding:28px 28px 32px;border:1px solid var(--line);border-radius:var(--r-lg);background:linear-gradient(180deg,rgba(255,255,255,.025),rgba(255,255,255,.008))}
.pain-art{aspect-ratio:240/120;margin-bottom:24px}
.pain-art svg,.dframe-art svg{display:block;width:100%;height:100%}
.pain-q{font-size:14px;color:var(--t4);text-decoration:line-through;text-decoration-color:rgba(243,245,248,.25)}
.pain-a{margin-top:6px;font-size:20px;line-height:1.4;font-weight:600;color:var(--t1)}
.pain-d{margin-top:10px;font-size:15px;color:var(--t3)}

/* structure */
.frame{border:1px solid var(--line-2);border-radius:var(--r-lg);background:linear-gradient(180deg,rgba(15,19,26,.75),rgba(8,10,14,.75));padding:20px 20px 12px;box-shadow:0 40px 100px rgba(0,0,0,.5)}
.layers{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:12px}
.layers .frame-tag{margin-left:auto}
.chip{height:34px;padding:0 16px;border-radius:999px;font:inherit;font-size:14px;color:var(--t3);background:transparent;border:1px solid var(--line-2);cursor:pointer;transition:all .2s}
.chip.on{color:#cfe1ff;background:rgba(59,130,246,.14);border-color:rgba(59,130,246,.5)}
.chip:focus-visible{outline:2px solid var(--accent-3);outline-offset:2px}
.chart{position:relative;aspect-ratio:1000/460}
.chart svg{position:absolute;inset:0;width:100%;height:100%}
.chart g{transition:opacity .35s}
.chart .off{opacity:0}

/* basis */
.split{display:grid;grid-template-columns:1.05fr 1fr;gap:72px;align-items:center}
.dcard{max-width:460px;margin:0 auto;padding:22px 22px 24px;border:1px solid var(--line-2);border-radius:var(--r-lg);background:var(--surface);box-shadow:0 40px 100px rgba(0,0,0,.5)}
.dcard-hd{display:flex;align-items:center;justify-content:space-between;font-size:15px;font-weight:600;color:var(--t1)}
.dcard-chart{position:relative;aspect-ratio:400/200;margin:16px 0 18px;border:1px solid var(--line);border-radius:10px;background:rgba(255,255,255,.015)}
.dcard-chart svg{position:absolute;inset:0;width:100%;height:100%}
.lbl{position:absolute;z-index:1;font-size:12px;line-height:1;padding:4px 7px;border-radius:6px;color:#cfe1ff;background:rgba(59,130,246,.16);white-space:nowrap}
.lbl-in{left:7%;top:44%}
.lbl-out{left:56%;top:74%}
.lbl-zs{left:41%;top:9%;color:var(--t3);background:rgba(255,255,255,.06)}
.dcard-row .k{font-size:13px;color:var(--t3)}
.meter{display:grid;grid-template-columns:52px 1fr;align-items:center;gap:12px;margin-top:10px;font-size:13px;color:var(--t2)}
.m-bar{height:10px;border-radius:999px;background:rgba(255,255,255,.06);overflow:hidden}
.m-bar i{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,#1668dc,#60a5fa)}
.dcard-ratio{display:flex;justify-content:space-between;align-items:baseline;margin-top:18px;padding-top:14px;border-top:1px solid var(--line);font-size:13px;color:var(--t3)}
.dcard-ratio b{font-size:24px;font-weight:600;color:var(--t1)}
.points{list-style:none;counter-reset:p}
.points li{counter-increment:p;position:relative;padding:0 0 26px 52px}
.points li::before{content:counter(p);position:absolute;left:0;top:0;width:34px;height:34px;border-radius:50%;display:grid;place-items:center;font-size:15px;font-weight:600;color:#cfe1ff;border:1px solid rgba(59,130,246,.5);background:rgba(59,130,246,.12)}
.points b{display:block;font-size:19px;font-weight:600;color:var(--t1);line-height:34px}
.points span{display:block;margin-top:2px;font-size:16px;color:var(--t3)}

/* drift */
.drift{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.dframe{border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;background:linear-gradient(180deg,rgba(15,19,26,.75),rgba(8,10,14,.75))}
.dframe-art{aspect-ratio:240/150;border-bottom:1px solid var(--line)}
.dframe figcaption{padding:18px 22px 20px}
.dframe b{display:block;font-size:18px;font-weight:600;color:var(--t1)}
.dframe b.ok{color:var(--accent-3)}
.dframe figcaption span{font-size:14px;color:var(--t3)}
.note{margin-top:20px;text-align:center;font-size:13px;color:var(--t4);letter-spacing:1px}

/* system */
.steps{list-style:none;display:flex;justify-content:center;align-items:center;flex-wrap:wrap;gap:12px 0;margin:0 auto 40px}
.steps li{display:flex;align-items:center;font-size:16px;font-weight:500;color:var(--t2)}
.steps li+li::before{content:'';width:48px;height:1px;margin:0 16px;background:linear-gradient(90deg,rgba(96,165,250,.15),rgba(96,165,250,.7))}
.steps li:last-child{color:var(--accent-3);font-weight:600}
.mods{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.mod{padding:26px 26px 28px;border:1px solid var(--line);border-radius:var(--r-md);background:rgba(255,255,255,.02);transition:border-color .2s}
.mod:hover{border-color:rgba(59,130,246,.4)}
.mod-n{font-size:13px;font-weight:600;letter-spacing:1px;color:var(--accent-3)}
.mod h3{margin-top:8px;font-size:18px;font-weight:600;color:var(--t1)}
.mod p{margin-top:6px;font-size:15px;color:var(--t3)}

/* closing */
.closing{padding-top:140px;text-align:center}
.end-t{font-size:clamp(36px,6vw,64px);font-weight:700;letter-spacing:.12em;line-height:1.2}
.end-t .grad{background:linear-gradient(90deg,#9cc4ff,#3b82f6 60%,#1668dc);-webkit-background-clip:text;background-clip:text;color:transparent}
.end-s{margin:18px 0 36px;font-size:var(--fs-lead);color:var(--t3)}

/* reveal */
.js .rv{opacity:0;transform:translateY(20px);transition:opacity .7s ease,transform .7s cubic-bezier(.16,1,.3,1)}
.js .rv.in{opacity:1;transform:none}

/* ── Footer ── */
.foot{margin-top:120px;padding:40px 0 48px;border-top:1px solid var(--line);font-size:13px;color:var(--t4);text-align:center}
.foot p+p{margin-top:6px}

/* ── Responsive ── */
@media(max-width:1024px){
  .hero{padding-top:64px}
  .stage{margin-top:56px}
  .nav-links{display:none}
  .pains{gap:16px}
  .pain{padding:22px 20px 24px}
  .split{grid-template-columns:1fr;gap:48px}
  .split-copy{order:-1}
  .sec-head.left{text-align:center;margin:0 auto 32px}
  .points{max-width:520px;margin:0 auto}
}
@media(max-width:768px){
  .sec{padding-top:72px}
  .sec-head{margin-bottom:32px}
  .sec-sub{font-size:15px}
  .eyebrow{font-size:13px}
  .pains,.mods{grid-template-columns:1fr;gap:14px}
  .pain{padding:20px 20px 22px;display:grid;grid-template-columns:96px 1fr;column-gap:16px;align-items:start}
  .pain-art{grid-row:1/4;margin:4px 0 0;aspect-ratio:1/1}
  .pain-a{font-size:17px}
  .pain-d{font-size:14px;margin-top:6px}
  .frame{padding:14px 10px 8px;border-radius:var(--r-md)}
  .layers{gap:8px}
  .chip{height:30px;padding:0 12px;font-size:13px}
  .layers .frame-tag{display:none}
  .chart{aspect-ratio:1000/620}
  .dcard{padding:18px}
  .points li{padding:0 0 18px 46px}
  .points b{font-size:17px}
  .points span{font-size:15px}
  .drift{grid-template-columns:repeat(3,1fr);gap:8px}
  .dframe{border-radius:var(--r-sm)}
  .dframe figcaption{padding:10px 6px 12px;text-align:center}
  .dframe b{font-size:15px}
  .dframe figcaption span{font-size:12px;line-height:1.5;display:block;margin-top:2px}
  .steps{margin-bottom:24px}
  .steps li{font-size:14px}
  .steps li+li::before{width:16px;margin:0 6px}
  .mod{padding:18px 20px;display:grid;grid-template-columns:auto 1fr;column-gap:14px}
  .mod-n{grid-row:1/3;line-height:28px}
  .mod h3{margin-top:0;font-size:16px;line-height:28px}
  .mod p{margin-top:0;font-size:14px}
  .closing{padding-top:96px}
  .end-s{font-size:15px;margin:14px 0 28px}
  .hero{padding-top:48px}
  .h1{margin:20px 0 16px}
  .cap{height:40px;padding:0 18px;font-size:16px;letter-spacing:2px}
  .caps{gap:12px}
  .caps .x{font-size:20px}
  .lead{font-size:15.5px;line-height:1.75}
  .lead .br{margin-top:4px}
  .coverage{font-size:12.5px;letter-spacing:.5px}
  .stage{margin-top:44px}
  .stage-inner{aspect-ratio:350/306}
  .laptop{left:6%;width:76%}
  .scr{border-radius:10px 10px 0 0}
  .phone{right:3%;top:20%;width:32%;border-width:1.2px}
  .hero::before{top:480px}
  .foot{margin-top:80px}
}
@media(max-width:380px){
  .nav .brand span{font-size:15px}
  .steps li{font-size:13px}
  .steps li+li::before{width:10px;margin:0 4px}
}

@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
  .stage .laptop,.stage .phone{opacity:1;transform:none}
  .stage .zs,.stage .bd,.stage .row{opacity:1}
  .stage .px,.stage .bi,.stage .seg{stroke-dashoffset:0}
  .js .rv{opacity:1;transform:none}
}