:root{
  --bg:#f5f6f9; --ink:#0c0c0d; --muted:#565557; --line:#e4e7ee;
  --blue:#2e7cf6; --indigo:#3345f2; --peri:#90abfc; --white:#fff;
  --radius:24px; --shadow:0 20px 60px -20px rgba(51,69,242,.35);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:Inter,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--ink);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit}
.container{width:min(1120px,100% - 40px);margin-inline:auto}
.narrow{width:min(760px,100% - 40px)}

/* NAV */
.nav{position:fixed;inset:14px 0 auto 0;z-index:50;width:min(1120px,100% - 28px);margin-inline:auto;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:10px 12px 10px 18px;border-radius:999px;background:rgba(255,255,255,.7);backdrop-filter:saturate(180%) blur(16px);-webkit-backdrop-filter:saturate(180%) blur(16px);border:1px solid rgba(255,255,255,.8);transition:box-shadow .3s}
.nav.scrolled{box-shadow:0 8px 30px -12px rgba(12,12,13,.25)}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;text-decoration:none;letter-spacing:-.01em}
.nav-links{display:flex;gap:28px;font-size:.95rem;font-weight:500}
.nav-links a{text-decoration:none;color:var(--muted);transition:color .2s}
.nav-links a:hover{color:var(--ink)}

/* BUTTONS */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:14px 26px;border-radius:999px;font-weight:600;font-size:1rem;text-decoration:none;border:1px solid transparent;cursor:pointer;transition:transform .2s,box-shadow .2s,background .2s}
.btn:hover{transform:translateY(-2px)}
.btn-sm{padding:10px 20px;font-size:.92rem}
.btn-lg{padding:18px 34px;font-size:1.1rem}
.btn-dark{background:var(--ink);color:#fff}
.btn-grad{background:linear-gradient(100deg,#3345f2,#7c5cff 55%,#f08fb0);color:#fff;box-shadow:0 12px 30px -10px rgba(89,72,255,.7)}
.btn-grad:hover{box-shadow:0 18px 40px -10px rgba(89,72,255,.8)}
.btn-ghost{background:rgba(255,255,255,.75);border-color:var(--line);color:var(--ink)}

/* HERO */
.hero{position:relative;padding:150px 0 0;text-align:center;overflow:hidden;background:
  radial-gradient(900px 480px at 50% -10%,#c9d6ff 0%,rgba(201,214,255,0) 70%),
  linear-gradient(180deg,#e3eaff 0%,var(--bg) 78%)}
.hero-bg{position:absolute;inset:0;pointer-events:none;background-image:linear-gradient(rgba(51,69,242,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(51,69,242,.05) 1px,transparent 1px);background-size:56px 56px;-webkit-mask-image:linear-gradient(#000 30%,transparent 90%);mask-image:linear-gradient(#000 30%,transparent 90%)}
.watermark{position:absolute;left:50%;top:150px;transform:translateX(-50%);font-size:clamp(6rem,24vw,20rem);font-weight:800;letter-spacing:-.05em;color:rgba(51,69,242,.06);white-space:nowrap}
.hero-inner{position:relative}
.pill{display:inline-flex;align-items:center;gap:10px;padding:6px 16px 6px 6px;border-radius:999px;background:rgba(255,255,255,.85);border:1px solid var(--line);font-size:.9rem;font-weight:500;text-decoration:none;margin-bottom:26px;box-shadow:0 6px 20px -12px rgba(12,12,13,.3)}
.pill-new{background:var(--indigo);color:#fff;border-radius:999px;padding:3px 11px;font-size:.78rem;font-weight:700}
h1{font-size:clamp(2.1rem,6.4vw,5rem);line-height:1.04;letter-spacing:-.04em;font-weight:800}
.grad{background:linear-gradient(100deg,#3345f2,#7c5cff 60%,#e879a6);-webkit-background-clip:text;background-clip:text;color:transparent}
.lede{max-width:640px;margin:24px auto 0;font-size:clamp(1.05rem,2vw,1.25rem);color:var(--muted)}
.cta{display:flex;flex-wrap:wrap;gap:14px;justify-content:center;margin-top:34px}
.fine{margin-top:18px;font-size:.9rem;color:var(--muted)}

/* PHONES */
.stage{position:relative;height:min(560px,88vw);margin-top:56px;display:flex;justify-content:center}
.phone{position:absolute;bottom:-60px;width:min(290px,42vw);aspect-ratio:9/18.6;border-radius:44px;background:#0c0c0d;padding:9px;box-shadow:0 40px 80px -30px rgba(51,69,242,.55),0 0 0 2px #2a2b30 inset}
.phone-l{left:50%;transform:translateX(-96%) rotate(-5deg)}
.phone-r{left:50%;transform:translateX(-6%) rotate(4deg);bottom:-100px}
.notch{position:absolute;top:14px;left:50%;transform:translateX(-50%);width:32%;height:22px;background:#0c0c0d;border-radius:99px;z-index:3}
.screen{height:100%;background:#fff;border-radius:36px;overflow:hidden;padding:14px 14px 0;font-size:11px;color:#111;display:flex;flex-direction:column;gap:9px}
.sb{display:flex;justify-content:space-between;font-weight:600;font-size:10px;padding:2px 8px 0}
.app-title{font-weight:800;font-size:15px;margin-top:6px;line-height:1.2}
.app-title small{display:block;font-weight:500;font-size:10px;color:#8a8f9a}
.seg{display:flex;background:#eef0f4;border-radius:9px;padding:2px;font-size:9px;font-weight:600;color:#666}
.seg span{flex:1;text-align:center;padding:5px 0;border-radius:7px}
.seg .on{background:#fff;color:#111;box-shadow:0 1px 3px rgba(0,0,0,.12)}
.ai{display:flex;align-items:center;gap:5px;font-weight:700;font-size:10px;color:#7c5cff}
.sum{list-style:none;display:grid;gap:8px}
.sum li{background:#f5f6f9;border-radius:12px;padding:9px 10px;line-height:1.4;font-size:10.5px}
.mini-btn{margin-top:auto;margin-bottom:22px;background:#2e7cf6;color:#fff;text-align:center;border-radius:12px;padding:10px;font-weight:700;font-size:11px}
.count{text-align:center;color:#8a8f9a;font-size:10px;margin-top:6px}
.fc{background:#eaf1ff;border:1.5px solid #a9c4ff;border-radius:18px;padding:34px 16px;text-align:center;min-height:170px;display:grid;align-content:center;gap:8px}
.fc small,.face small{letter-spacing:.08em;color:#7b8394;font-weight:600;font-size:9px}
.fc p{font-size:16px;font-weight:600}
.tap{text-align:center;color:#8a8f9a;font-size:9.5px}
.arrows{display:flex;justify-content:center;gap:26px;margin-top:6px}
.arrows i{width:30px;height:30px;border-radius:50%;background:#d2d5dc;display:block}
.arrows i.on{background:#2e7cf6}
.float{position:absolute;z-index:4;background:rgba(255,255,255,.92);border:1px solid var(--line);border-radius:16px;padding:10px 14px;box-shadow:0 18px 40px -18px rgba(12,12,13,.4);display:grid;text-align:left;font-size:.85rem;animation:bob 6s ease-in-out infinite}
.float b{font-size:.92rem}.float span{color:var(--muted);font-size:.78rem}
.f1{left:calc(50% - 470px);top:120px}.f2{left:calc(50% + 300px);top:70px;animation-delay:-3s}
@keyframes bob{50%{transform:translateY(-10px)}}

/* WHO */
.who{padding:70px 0 40px;position:relative;background:var(--bg)}
.who-inner{display:flex;flex-wrap:wrap;gap:12px 28px;align-items:center;justify-content:center;color:var(--muted);font-size:.95rem}
.who-inner ul{display:flex;flex-wrap:wrap;gap:10px;list-style:none;justify-content:center}
.who-inner li{padding:8px 16px;border:1px solid var(--line);border-radius:999px;background:#fff;color:var(--ink);font-weight:500}

/* SECTIONS */
.section{padding:110px 0}
.section.alt{background:#fff}
.eyebrow{font-size:.85rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--indigo);margin-bottom:14px}
h2{font-size:clamp(2rem,4.4vw,3.2rem);line-height:1.1;letter-spacing:-.03em;font-weight:800;max-width:780px}
h3{font-size:1.2rem;letter-spacing:-.01em;margin-bottom:8px}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:56px}
.step{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:32px}
.num{width:42px;height:42px;border-radius:14px;background:linear-gradient(135deg,#3345f2,#7c5cff);color:#fff;display:grid;place-items:center;font-weight:800;margin-bottom:22px}
.step p,.card p{color:var(--muted)}
.bento{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:56px}
.card{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:32px;transition:transform .25s,box-shadow .25s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.c-wide{grid-column:span 2}
.card.dark{background:#0c0c0d;border-color:#0c0c0d;color:#fff}.card.dark p{color:#b8bcc6}
.ico{width:48px;height:48px;border-radius:14px;background:#fff;color:var(--indigo);display:grid;place-items:center;margin-bottom:20px;border:1px solid var(--line)}
.card.dark .ico{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.14);color:#fff}

/* STUDY */
.split{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.split-copy p{color:var(--muted);font-size:1.1rem;margin:20px 0}
.split-copy p.eyebrow{color:var(--indigo);font-size:.85rem;margin:0 0 14px}
.ticks{list-style:none;display:grid;gap:12px;margin:0 0 30px}
.ticks li{padding-left:34px;position:relative;font-weight:500}
.ticks li:before{content:"✓";position:absolute;left:0;top:1px;width:22px;height:22px;border-radius:50%;background:var(--indigo);color:#fff;font-size:.75rem;display:grid;place-items:center}
.split-demo{display:grid;justify-items:center;gap:14px}
.flip{width:min(400px,100%);aspect-ratio:4/3;perspective:1000px;background:none;border:0;cursor:pointer;font:inherit}
.flip-inner{position:relative;display:block;width:100%;height:100%;transition:transform .6s cubic-bezier(.2,.8,.2,1);transform-style:preserve-3d}
.flip.on .flip-inner{transform:rotateY(180deg)}
.face{position:absolute;inset:0;display:grid;align-content:center;justify-items:center;gap:12px;padding:32px;text-align:center;border-radius:28px;backface-visibility:hidden;-webkit-backface-visibility:hidden}
.face strong{font-size:1.35rem;line-height:1.3;letter-spacing:-.01em}
.front{background:#eaf1ff;border:2px solid #a9c4ff;box-shadow:var(--shadow)}
.back{background:#e6f8ee;border:2px solid #9ad8b5;transform:rotateY(180deg);box-shadow:0 20px 60px -20px rgba(30,160,90,.35)}
.hint{color:var(--muted);font-size:.9rem}

/* FAQ */
details{background:var(--bg);border:1px solid var(--line);border-radius:18px;padding:0 24px;margin-top:14px}
summary{cursor:pointer;list-style:none;padding:20px 0;font-weight:600;display:flex;justify-content:space-between;gap:16px}
summary::-webkit-details-marker{display:none}
summary:after{content:"+";font-size:1.4rem;line-height:1;color:var(--indigo);transition:transform .25s}
details[open] summary:after{transform:rotate(45deg)}
details p{padding:0 0 22px;color:var(--muted)}
details a{color:var(--indigo)}

/* FINAL */
.final{padding:120px 0;text-align:center;background:linear-gradient(180deg,var(--bg),#dfe7ff)}
.final .container{display:grid;justify-items:center;gap:18px}
.final h2{max-width:none}
.final p{color:var(--muted);font-size:1.15rem}
.final-logo{border-radius:16px}

/* FOOTER */
.footer{background:#0c0c0d;color:#b8bcc6;padding:48px 0}
.foot{display:grid;gap:20px;font-size:.92rem}
.footer .brand{color:#fff}
.footer nav{display:flex;flex-wrap:wrap;gap:12px 26px}
.footer a{text-decoration:none}.footer a:hover{color:#fff}

/* REVEAL */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}.float{animation:none}html{scroll-behavior:auto}}

/* RESPONSIVE */
@media (max-width:980px){.f1,.f2{display:none}.steps{grid-template-columns:1fr}.bento{grid-template-columns:1fr 1fr}.c-wide{grid-column:span 2}.split{grid-template-columns:1fr;gap:40px}}
@media (max-width:720px){.nav-links{display:none}.hero{padding-top:120px}.stage{height:min(430px,100vw)}.phone{width:44vw;border-radius:30px;padding:6px}.screen{border-radius:25px;font-size:8px;padding:10px 9px 0}.notch{height:14px;top:10px}.bento{grid-template-columns:1fr}.c-wide{grid-column:auto}.section{padding:80px 0}.app-title{font-size:12px}.sum li{font-size:8.5px;padding:6px 7px}.seg:not(.two) span:nth-child(-n+2){display:none}.fc{padding:20px 10px;min-height:110px}.fc p{font-size:12px}}

/* LEGAL */
.legal{padding:140px 0 90px;background:#fff}
.legal .container{width:min(760px,100% - 40px)}
.legal h1{font-size:clamp(2rem,5vw,3rem);margin-bottom:8px}
.legal .updated{color:var(--muted);margin-bottom:32px}
.legal h2{font-size:1.4rem;margin:36px 0 10px;letter-spacing:-.02em;max-width:none}
.legal p,.legal li{color:#3a3b3f;margin-bottom:12px}
.legal ul{padding-left:22px;margin-bottom:12px}
.legal a{color:var(--indigo)}

/* ---- SEO PAGES (landing, blog, language switch, shared footer) ---- */
.nav-right{display:flex;align-items:center;gap:10px}
.lang{font-size:.85rem;font-weight:600;color:var(--muted);text-decoration:none;padding:7px 12px;border-radius:999px;border:1px solid var(--line);background:rgba(255,255,255,.8);white-space:nowrap}
.lang:hover{color:var(--ink)}
html:lang(zh-Hant-HK) body{font-family:Inter,"PingFang HK","Noto Sans HK","Microsoft JhengHei",system-ui,sans-serif;line-height:1.75}
html:lang(zh-Hant-HK) h1,html:lang(zh-Hant-HK) h2,html:lang(zh-Hant-HK) h3{letter-spacing:0}
html:lang(zh-Hant-HK) h1{line-height:1.2}
html:lang(zh-Hant-HK) .eyebrow{letter-spacing:.06em}
.page-hero{padding:130px 0 56px;background:radial-gradient(900px 420px at 50% -10%,#c9d6ff 0%,rgba(201,214,255,0) 70%),linear-gradient(180deg,#e3eaff 0%,var(--bg) 100%)}
.page-hero .container{width:min(820px,100% - 40px)}
.page-hero h1,.post-head h1{font-size:clamp(2rem,5vw,3.3rem);line-height:1.1;letter-spacing:-.035em}
.page-hero .lede{margin:20px 0 0;max-width:none}
.page-hero .cta{justify-content:flex-start;margin-top:28px}
.page-hero .fine{margin-top:14px}
.crumbs{margin-bottom:22px;font-size:.85rem;color:var(--muted)}
.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px}
.crumbs li+li:before{content:"/";margin-right:6px;color:#9aa0ad}
.crumbs a{text-decoration:none}.crumbs a:hover{color:var(--ink)}
.lp-section{padding:64px 0}
.lp-section.alt{background:#fff}
.lp-section h2,.prose h2{font-size:clamp(1.5rem,3vw,2rem);line-height:1.2;letter-spacing:-.025em;margin:0 0 16px;max-width:none}
.prose{font-size:1.06rem}
.prose p{color:#3a3b3f;margin:0 0 16px}
.prose h2{margin-top:44px}
.prose h2:first-child{margin-top:0}
.prose h3{margin:26px 0 8px}
.prose ul,.prose ol{padding-left:22px;margin:0 0 18px;color:#3a3b3f}
.prose li{margin-bottom:8px}
.prose a{color:var(--indigo);text-underline-offset:3px}
.prose strong{color:var(--ink)}
.callout{background:#eaf1ff;border:1px solid #a9c4ff;border-radius:18px;padding:18px 22px;margin:22px 0;color:#1f2a55}
.callout p{color:#1f2a55;margin:0}
.tbl{overflow-x:auto;margin:20px 0}
.tbl table{border-collapse:collapse;width:100%;min-width:520px;font-size:.98rem}
.tbl th,.tbl td{text-align:left;padding:12px 14px;border-bottom:1px solid var(--line);vertical-align:top}
.tbl th{background:var(--bg);font-weight:700}
.lp-steps{margin-top:28px}
.related{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:16px;margin-top:24px}
.related a.card{display:block;text-decoration:none;color:inherit}
.related a.card h3{font-size:1.08rem}
.related a.card p{font-size:.95rem}
.related a.card .more{display:inline-block;margin-top:12px;font-weight:600;color:var(--indigo);font-size:.92rem}
.post-head{padding:130px 0 34px;background:linear-gradient(180deg,#e3eaff 0%,var(--bg) 100%)}
.post-head .container{width:min(760px,100% - 40px)}
.post-meta{margin-top:16px;color:var(--muted);font-size:.92rem}
.post-body{padding:20px 0 40px}
.cta-card{background:#0c0c0d;color:#fff;border-radius:var(--radius);padding:34px;display:grid;gap:12px;justify-items:start;margin:40px 0 0}
.cta-card h2,.cta-card h3{color:#fff;margin:0;font-size:1.5rem}
.cta-card p{color:#b8bcc6;margin:0}
.eyebrow-link{color:var(--indigo);font-weight:600;text-decoration:none;font-size:.92rem}
.footer .foot-cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:28px}
.footer h4{color:#fff;font-size:.85rem;letter-spacing:.08em;text-transform:uppercase;margin-bottom:12px}
.footer ul{list-style:none;display:grid;gap:8px}
.footer .foot-note{display:grid;gap:8px}
@media (max-width:720px){.page-hero{padding-top:112px}.lp-section{padding:48px 0}.cta-card{padding:26px}.post-head{padding-top:112px}.nav{padding:8px 8px 8px 14px}.nav .btn-sm{padding:9px 14px}}
.brand{white-space:nowrap}.brand img{flex-shrink:0}

.lang .short{display:none}
@media (max-width:620px){
  .nav-right{gap:6px}
  .lang{padding:7px 10px}
  .lang .full{display:none}
  .lang .short{display:inline}
}