:root{
  --ink:#1d1d1f;
  --muted:#6e6e73;
  --soft:#f5f5f7;
  --paper:#fff;
  --line:#d2d2d7;
  --blue:#0071e3;
  --blue-hover:#0077ed;
  --blue-soft:#e8f2fd;
  --pad:clamp(20px,4.6vw,64px);
  --sans:-apple-system,BlinkMacSystemFont,"SF Pro Display","PingFang SC","Noto Sans SC","Microsoft YaHei",sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
p,h1,h2,h3{margin:0}
.wrap{width:min(1120px,calc(100% - var(--pad) * 2));margin:0 auto}
:focus-visible{outline:3px solid rgba(0,113,227,.55);outline-offset:4px;border-radius:8px}
.skip-link{position:fixed;left:16px;top:12px;z-index:100;background:#fff;color:var(--ink);padding:10px 14px;border-radius:999px;box-shadow:0 8px 28px rgba(0,0,0,.14);transform:translateY(-180%);transition:transform .2s ease}
.skip-link:focus{transform:none}

/* navigation */
.site-bar{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.82);border-bottom:1px solid rgba(0,0,0,.08);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px)}
.nav-inner{width:min(1220px,calc(100% - var(--pad) * 2));min-height:58px;margin:0 auto;display:flex;align-items:center;gap:30px}
.brand-lockup{display:flex;align-items:center;gap:9px;font-size:16px;font-weight:650;letter-spacing:.01em;white-space:nowrap}
.brand-lockup img{width:32px;height:32px;object-fit:contain}
.site-nav{margin-left:auto;display:flex;align-items:center;gap:clamp(18px,2.5vw,34px);font-size:13px;color:#4f4f53}
.site-nav a{transition:color .18s ease}
.site-nav a:hover{color:var(--blue)}
.nav-cta{font-size:13px;font-weight:620;color:#fff;background:var(--blue);padding:8px 15px;border-radius:999px;transition:background .18s ease,transform .18s ease}
.nav-cta:hover{background:var(--blue-hover);transform:translateY(-1px)}

/* hero */
.hero{padding:clamp(74px,8vw,118px) 0 clamp(100px,10vw,146px);text-align:center;background:#fff}
.hero-copy{width:min(1020px,calc(100% - var(--pad) * 2));margin:0 auto}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-size:13px;font-weight:650;letter-spacing:.12em;color:var(--blue)}
.eyebrow span{width:6px;height:6px;border-radius:50%;background:var(--blue)}
.hero h1{font-size:clamp(58px,7.7vw,98px);line-height:1.01;letter-spacing:-.065em;font-weight:720;margin-top:18px;text-wrap:balance}
.hero h1 span{color:#3a3a3c}
.hero-lead{max-width:760px;margin:28px auto 0;font-size:clamp(18px,1.8vw,23px);line-height:1.62;letter-spacing:-.02em;color:var(--muted)}
.hero-actions{display:flex;align-items:center;justify-content:center;gap:28px;flex-wrap:wrap;margin-top:34px}
.btn-primary{display:inline-flex;align-items:center;justify-content:center;gap:9px;background:var(--blue);color:#fff;padding:13px 22px;border-radius:999px;font-size:15px;font-weight:620;line-height:1.2;transition:background .18s ease,transform .18s ease;box-shadow:0 8px 24px rgba(0,113,227,.18)}
.btn-primary:hover{background:var(--blue-hover);transform:translateY(-1px)}
.btn-primary span{font-size:18px;line-height:1;font-weight:450}
.btn-link{display:inline-flex;align-items:center;gap:5px;color:var(--blue);font-size:15px;font-weight:550}
.btn-link span{font-size:20px;line-height:1;transition:transform .18s ease}
.btn-link:hover span{transform:translateX(3px)}
.hero-metrics{display:flex;justify-content:center;align-items:stretch;gap:0;margin-top:42px;color:var(--muted)}
.hero-metrics div{padding:0 clamp(22px,3vw,38px);border-right:1px solid #d8d8dc;text-align:center}
.hero-metrics div:last-child{border-right:0}
.hero-metrics strong{display:block;color:var(--ink);font-size:27px;line-height:1;font-weight:680;letter-spacing:-.02em}
.hero-metrics span{display:block;margin-top:8px;font-size:12px;white-space:nowrap}

.hero-stage{width:min(1120px,calc(100% - var(--pad) * 2));height:clamp(500px,49vw,590px);margin:clamp(54px,6vw,78px) auto 0;border-radius:34px;overflow:hidden;background:#050505;display:grid;grid-template-columns:43% 57%;text-align:left;box-shadow:0 34px 90px rgba(0,0,0,.15)}
.hero-stage-copy{padding:clamp(42px,5vw,64px) 30px clamp(38px,4vw,52px) clamp(42px,5vw,68px);display:flex;flex-direction:column;align-items:flex-start;color:#fff;position:relative;z-index:2}
.stage-kicker{font-size:11px;font-weight:650;letter-spacing:.18em;color:#8fc0ff}
.hero-stage h2{margin-top:25px;font-size:clamp(43px,4.8vw,59px);line-height:1.08;letter-spacing:-.055em;font-weight:680}
.hero-stage-copy>p:not(.stage-kicker){margin-top:21px;max-width:390px;color:#b8b8bd;font-size:18px;line-height:1.68;letter-spacing:-.015em}
.hero-stage-copy>a{display:inline-flex;align-items:center;gap:8px;margin-top:27px;color:#8fc0ff;font-size:15px;font-weight:600}
.hero-stage-copy>a span{font-size:18px;transition:transform .18s ease}
.hero-stage-copy>a:hover span{transform:translate(2px,-2px)}
.stage-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:auto;padding-top:32px}
.stage-tags span{padding:8px 12px;border:1px solid #363638;border-radius:999px;color:#a7a7ac;font-size:11px;letter-spacing:.02em;white-space:nowrap}
.hero-media{position:relative;min-width:0;background:#101012}
.hero-media:before{content:"";position:absolute;z-index:2;inset:0;background:linear-gradient(90deg,#050505 0%,rgba(5,5,5,.34) 22%,rgba(5,5,5,0) 53%);pointer-events:none}
.hero-media img{width:100%;height:100%;object-fit:cover;object-position:50% 50%}
.media-note{position:absolute;z-index:3;right:24px;bottom:22px;padding:9px 13px;border-radius:999px;background:rgba(18,18,20,.72);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);color:#fff;font-size:11px;font-weight:550}

/* shared section typography */
.section-kicker{color:var(--blue);font-size:13px;font-weight:650;letter-spacing:.11em;text-transform:uppercase}
.section-kicker.light{color:#8fc0ff}
.section-heading h2,.promise h2,.voice h2{margin-top:16px;font-size:clamp(44px,5.2vw,66px);line-height:1.06;letter-spacing:-.058em;font-weight:700;text-wrap:balance}
.section-heading-row{display:flex;align-items:flex-end;justify-content:space-between;gap:70px}
.section-summary{max-width:350px;color:var(--muted);font-size:17px;line-height:1.7;letter-spacing:-.012em}

/* argument */
.argument{padding:clamp(112px,13vw,164px) 0;background:#fff}
.argument-grid{display:grid;grid-template-columns:minmax(0,.92fr) minmax(0,1.08fr);gap:clamp(50px,8vw,116px);margin-top:clamp(56px,6vw,78px);align-items:start}
.argument-intro p{max-width:490px;color:var(--muted);font-size:19px;line-height:1.8;letter-spacing:-.015em}
.argument-intro .argument-close{margin-top:28px;color:var(--ink);font-size:25px;line-height:1.55;font-weight:600;letter-spacing:-.03em}
.arg-list{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.arg-list li{display:grid;grid-template-columns:48px 1fr;gap:18px;align-items:start;padding:26px 0;border-bottom:1px solid var(--line)}
.arg-list li>span{padding-top:5px;color:#a1a1a6;font-size:12px;font-weight:650;letter-spacing:.06em}
.arg-list p{font-size:clamp(18px,2vw,24px);line-height:1.55;letter-spacing:-.025em;color:#343438}

/* questions */
.questions{background:var(--soft);padding:clamp(112px,13vw,164px) 0}
.qa-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin-top:clamp(52px,6vw,72px)}
.qa-card{min-height:315px;padding:34px 36px 38px;border-radius:28px;background:#fff;display:flex;flex-direction:column}
.qa-no{width:46px;height:46px;border-radius:50%;display:grid;place-items:center;background:var(--blue-soft);color:var(--blue);font-size:13px;font-weight:680}
.qa-card h3{margin-top:36px;font-size:clamp(25px,2.5vw,32px);line-height:1.25;letter-spacing:-.04em;font-weight:650}
.qa-card p{margin-top:16px;color:var(--muted);font-size:16px;line-height:1.72;letter-spacing:-.01em}
.purchase-note{margin-top:32px;color:#86868b;font-size:13px;line-height:1.7}

/* voice */
.voice{background:#050505;color:#f5f5f7;padding:clamp(116px,13vw,170px) 0}
.voice-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);gap:clamp(60px,8vw,118px);align-items:center}
.voice h2{color:#f5f5f7}
.voice-body>p{color:#a1a1a6;font-size:17px;line-height:1.85;letter-spacing:-.01em}
.voice-body>p+p{margin-top:18px}
.voice-body .voice-quote{margin-top:38px;color:#fff;font-size:clamp(25px,2.7vw,35px);line-height:1.48;letter-spacing:-.04em;font-weight:610}
.voice-body .voice-sign{margin-top:26px;color:#8e8e93;font-size:13px;letter-spacing:.02em}

/* promise */
.promise{padding:clamp(112px,13vw,164px) 0;background:#fff}
.promise-grid{display:grid;grid-template-columns:minmax(0,.95fr) minmax(0,1.05fr);gap:clamp(50px,8vw,116px);align-items:center}
.promise-list{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.promise-list li{padding:19px 0;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:15px;font-size:clamp(20px,2.2vw,26px);font-weight:600;letter-spacing:-.03em}
.promise-list li:before{content:"";width:10px;height:10px;border:2px solid var(--blue);border-radius:50%;flex:none}
.promise-body>p{margin-top:28px;color:var(--muted);font-size:16px;line-height:1.85;max-width:580px}

/* start */
.start{background:var(--soft);padding:clamp(112px,13vw,164px) 0}
.track{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin-top:clamp(52px,6vw,72px)}
.track-step{min-height:365px;padding:34px 32px 30px;border-radius:28px;background:#fff;display:flex;flex-direction:column;transition:transform .22s ease,box-shadow .22s ease}
.track-step:hover{transform:translateY(-4px);box-shadow:0 22px 55px rgba(0,0,0,.08)}
.track-no{color:var(--blue);font-size:13px;font-weight:680;letter-spacing:.08em}
.track-step h3{margin-top:46px;font-size:clamp(25px,2.3vw,31px);line-height:1.2;letter-spacing:-.04em;font-weight:650}
.track-step p{margin-top:13px;color:var(--muted);font-size:15px;line-height:1.7}
.track-link{margin-top:auto;padding-top:28px;display:flex;align-items:center;justify-content:space-between;gap:16px;color:var(--blue);font-size:14px;font-weight:600;line-height:1.45}
.track-link b{font-size:18px;font-weight:450}

/* closing */
.closing{background:#050505;color:#fff;padding:clamp(112px,14vw,176px) 0;text-align:center}
.closing-en{color:#8fc0ff;font-size:12px;font-weight:650;letter-spacing:.16em}
.closing h2{margin-top:22px;font-size:clamp(52px,7vw,86px);line-height:1.03;letter-spacing:-.062em;font-weight:710;text-wrap:balance}
.closing-actions{display:flex;align-items:center;justify-content:center;gap:30px;flex-wrap:wrap;margin-top:40px}
.btn-primary.light{background:var(--blue);box-shadow:none;color:#fff}
.closing-link{display:inline-flex;align-items:center;gap:6px;color:#a1a1a6;font-size:15px;font-weight:550}
.closing-link span{font-size:19px;transition:transform .18s ease}
.closing-link:hover{color:#fff}
.closing-link:hover span{transform:translateX(3px)}

/* footer */
.footer{border-top:1px solid #ededf0;background:#fff;color:#86868b;font-size:12px}
.footer-inner{width:min(1220px,calc(100% - var(--pad) * 2));margin:0 auto;min-height:64px;display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;padding:18px 0}
.footer-legal{display:flex;align-items:center;gap:6px 16px;flex-wrap:wrap}
.footer-legal a{color:inherit;text-decoration:none}
.icp-link:hover{color:var(--ink);text-decoration:underline;text-underline-offset:3px}

/* entrance motion */
@keyframes rise{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}
@keyframes stageIn{from{opacity:0;transform:translateY(24px) scale(.992)}to{opacity:1;transform:none}}
.eyebrow,.hero h1,.hero-lead,.hero-actions,.hero-metrics{animation:rise .72s cubic-bezier(.2,.7,.2,1) both}
.hero h1{animation-delay:.06s}.hero-lead{animation-delay:.12s}.hero-actions{animation-delay:.18s}.hero-metrics{animation-delay:.23s}
.hero-stage{animation:stageIn .86s cubic-bezier(.2,.7,.2,1) .16s both}

@media(max-width:1024px){
  .site-nav{display:none}
  .nav-cta{margin-left:auto}
  .hero-stage{grid-template-columns:46% 54%}
  .hero-stage-copy{padding-left:44px}
  .argument-grid,.voice-grid,.promise-grid{grid-template-columns:1fr;gap:50px}
  .argument-intro{max-width:720px}
}
@media(max-width:760px){
  :root{--pad:20px}
  .nav-inner{min-height:56px;gap:14px}
  .brand-lockup{font-size:15px}
  .brand-lockup img{width:29px;height:29px}
  .nav-cta{font-size:12px;padding:8px 12px}
  .hero{padding:62px 0 94px}
  .hero h1{font-size:clamp(47px,13vw,66px);letter-spacing:-.062em}
  .hero-lead{font-size:17px;line-height:1.72;margin-top:23px}
  .hero-actions{gap:17px;margin-top:29px;flex-direction:column}
  .btn-primary{width:min(100%,340px)}
  .hero-metrics{margin-top:36px}
  .hero-metrics div{padding:0 13px}
  .hero-metrics strong{font-size:23px}
  .hero-metrics span{font-size:10px}
  .hero-stage{height:auto;grid-template-columns:1fr;border-radius:27px;margin-top:48px}
  .hero-stage-copy{padding:38px 27px 34px}
  .hero-stage h2{font-size:43px}
  .hero-stage-copy>p:not(.stage-kicker){font-size:16px;line-height:1.7}
  .stage-tags{padding-top:26px}
  .hero-media{height:430px}
  .hero-media:before{background:linear-gradient(180deg,#050505 0%,rgba(5,5,5,.22) 25%,rgba(5,5,5,0) 55%)}
  .media-note{right:16px;bottom:16px}
  .section-heading-row{display:block}
  .section-summary{margin-top:24px;max-width:560px;font-size:15px}
  .section-heading h2,.promise h2,.voice h2{font-size:clamp(38px,11vw,51px)}
  .argument,.questions,.voice,.promise,.start{padding-top:96px;padding-bottom:96px}
  .argument-grid,.qa-grid,.voice-grid,.promise-grid,.track{grid-template-columns:1fr}
  .argument-grid{gap:40px;margin-top:44px}
  .argument-intro p{font-size:17px;line-height:1.8}
  .argument-intro .argument-close{font-size:22px}
  .qa-grid{gap:12px;margin-top:42px}
  .qa-card{min-height:0;padding:28px 26px 30px;border-radius:23px}
  .qa-card h3{margin-top:28px;font-size:27px}
  .qa-card p{font-size:15px;line-height:1.75}
  .voice-grid{gap:38px}
  .voice-body>p{font-size:16px;line-height:1.8}
  .voice-body .voice-quote{font-size:26px}
  .promise-grid{gap:34px}
  .track{gap:12px;margin-top:42px}
  .track-step{min-height:300px;padding:28px 25px 26px;border-radius:23px}
  .track-step h3{margin-top:34px;font-size:27px}
  .closing{padding:102px 0 110px}
  .closing h2{font-size:clamp(45px,13vw,68px)}
  .closing-actions{flex-direction:column;gap:20px;margin-top:33px}
  .footer-inner{display:block;line-height:1.8;padding:20px 0}
  .footer-inner .icp-link{display:inline-block;margin-top:5px}
  .footer-legal{display:block}
}
@media(max-width:390px){
  .hero h1{font-size:45px}
  .hero-metrics div{padding:0 9px}
  .hero-metrics strong{font-size:21px}
  .hero-media{height:380px}
  .media-note{font-size:10px;max-width:calc(100% - 32px)}
}
@media(prefers-reduced-motion:reduce){
  *,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
}