:root{
  --indigo:#4F46E5; --indigo-700:#4338CA; --indigo-d:#6366F1;
  --container:#E8E7FD; --on-container:#1E1B4B;
  --bg:#EEF0F6; --surface:#FFFFFF; --surface-alt:#E7E9F2;
  --ink:#14151A; --ink-dim:#494C57; --muted:#80848F;
  --line:#E2E5EE;
  --success:#16A34A; --success-bg:#DCFCE7;
  --warn:#B45309;
  --c-quick:#4F46E5; --c-quick-bg:#ECEBFE;
  --c-id:#0F766E;    --c-id-bg:#D9F2EE;
  --c-work:#B45309;  --c-work-bg:#FBEBD2;
  --c-social:#BE185D;--c-social-bg:#FBE3EE;
  --r:18px; --shadow:0 1px 2px rgba(20,21,26,.04),0 8px 24px rgba(20,21,26,.06);
  --font:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,system-ui,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.55;-webkit-font-smoothing:antialiased}
.wrap{max-width:1080px;margin:0 auto;padding:0 22px}
a{color:inherit}
h1,h2,h3{letter-spacing:-.02em;line-height:1.1}

/* logo mark */
.mark{width:34px;height:34px;border-radius:9px;background:var(--indigo);display:grid;place-items:center;flex:none}
.mark svg{width:21px;height:21px}
.wordmark{font-weight:800;font-size:19px;letter-spacing:-.02em}

/* header */
header{position:sticky;top:0;z-index:40;background:rgba(238,240,246,.82);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
header .wrap{display:flex;align-items:center;gap:14px;height:64px}
header a.brand{display:flex;align-items:center;gap:11px;text-decoration:none;color:inherit}
nav{margin-left:auto;display:flex;align-items:center;gap:26px}
nav a.link{font-size:14.5px;font-weight:600;color:var(--ink-dim);text-decoration:none}
nav a.link:hover{color:var(--ink)}
.btn{display:inline-flex;align-items:center;gap:8px;font-weight:700;font-size:14.5px;border:none;border-radius:11px;
  padding:10px 16px;cursor:pointer;text-decoration:none;transition:.15s;white-space:nowrap}
.btn-primary{background:var(--indigo);color:#fff}
.btn-primary:hover{background:var(--indigo-700)}
.btn-ghost{background:var(--surface);color:var(--ink);border:1px solid var(--line)}
@media(max-width:640px){nav .link{display:none}}

/* hero */
.hero{padding:54px 0 30px;text-align:center;position:relative}
.hero::before{content:"";position:absolute;inset:0;background:
  radial-gradient(60% 50% at 50% 0%,rgba(79,70,229,.10),transparent 70%);pointer-events:none}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:700;color:var(--indigo);
  background:var(--container);border-radius:999px;padding:6px 14px;margin-bottom:18px}
.hero h1{font-size:clamp(32px,5vw,50px);font-weight:850;max-width:16ch;margin:0 auto}
.hero h1 em{font-style:normal;color:var(--indigo);background:linear-gradient(180deg,transparent 62%,var(--container) 62%);padding:0 .08em}
.hero p.lede{font-size:clamp(16px,2.4vw,19px);color:var(--ink-dim);max-width:54ch;margin:18px auto 0}

/* tool card */
.tool{background:var(--surface);border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow);
  padding:26px;margin:30px auto 0;max-width:680px;text-align:left}
.drop{border:2px dashed #CBD0DE;border-radius:var(--r);padding:38px 18px;text-align:center;cursor:pointer;
  background:var(--bg);transition:.15s}
.drop:hover,.drop.drag{border-color:var(--indigo);background:var(--c-quick-bg)}
.drop .di{width:46px;height:46px;border-radius:12px;background:var(--container);display:grid;place-items:center;margin:0 auto 12px}
.drop strong{color:var(--indigo);font-weight:700}
.drop small{display:block;color:var(--muted);margin-top:6px;font-size:13px}

.panel{margin-top:18px}
.panel.hidden,.result.hidden,.afterapp.hidden{display:none}
.row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.field label{display:block;font-size:12.5px;font-weight:700;color:var(--muted);margin-bottom:6px;text-transform:uppercase;letter-spacing:.03em}
.inputwrap{display:flex;align-items:center;border:1px solid var(--line);border-radius:12px;background:var(--surface);overflow:hidden}
.inputwrap:focus-within{border-color:var(--indigo);box-shadow:0 0 0 3px rgba(79,70,229,.14)}
.inputwrap input{flex:1;border:none;outline:none;padding:12px;font-size:16px;background:transparent;color:var(--ink);min-width:0}
.unit{display:flex;border-left:1px solid var(--line)}
.unit button{border:none;background:var(--bg);padding:0 12px;font-size:13px;font-weight:700;color:var(--muted);cursor:pointer}
.unit button.on{background:var(--indigo);color:#fff}
.hint{font-size:12px;color:var(--muted);margin-top:6px}

.presets{display:flex;flex-wrap:wrap;gap:9px;margin-top:18px}
.chip{display:inline-flex;flex-direction:column;align-items:flex-start;gap:2px;border:1px solid var(--line);background:var(--surface);
  border-radius:12px;padding:9px 13px;cursor:pointer;transition:.15s;text-align:left}
.chip:hover{border-color:var(--indigo);background:var(--c-quick-bg)}
.chip b{font-size:13.5px;font-weight:700}
.chip span{font-size:11.5px;color:var(--muted)}

.go{width:100%;margin-top:18px;background:var(--indigo);color:#fff;border:none;border-radius:13px;
  padding:15px;font-size:16px;font-weight:800;cursor:pointer;transition:.15s}
.go:hover{background:var(--indigo-700)} .go:disabled{opacity:.55;cursor:wait}

/* result */
.result{margin-top:22px;border-top:1px solid var(--line);padding-top:22px}
.result .grid{display:grid;grid-template-columns:auto 1fr;gap:18px;align-items:center}
.result img{width:120px;height:120px;object-fit:cover;border-radius:14px;border:1px solid var(--line);background:var(--bg)}
.verdict{font-weight:800;font-size:17px;display:flex;align-items:center;gap:8px}
.verdict.ok{color:var(--success)} .verdict.partial{color:var(--warn)}
.sizes{display:flex;gap:10px;align-items:baseline;margin:6px 0 4px;color:var(--ink-dim);font-size:14px}
.sizes .new{font-weight:800;color:var(--ink);font-size:18px}
.sizes .arrow{color:var(--success)}
.dl{display:inline-flex;align-items:center;gap:8px;background:var(--success);color:#fff;text-decoration:none;
  border-radius:11px;padding:11px 18px;font-weight:800;font-size:14.5px;margin-top:8px}
.afterapp{margin-top:16px;background:var(--c-quick-bg);border-radius:13px;padding:13px 15px;font-size:13.5px;color:var(--on-container);
  display:flex;align-items:center;gap:12px;justify-content:space-between;flex-wrap:wrap}
.afterapp a{font-weight:800;color:var(--indigo);text-decoration:none;white-space:nowrap}

/* trust */
.trust{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:46px 0 10px}
.trust .t{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:20px}
.trust .t .ic{font-size:20px}
.trust .t b{display:block;margin:8px 0 4px;font-size:15.5px}
.trust .t p{font-size:13.5px;color:var(--ink-dim)}
@media(max-width:720px){.trust{grid-template-columns:1fr}}

/* use-cases */
section.cases{padding:54px 0 10px}
.sec-head{text-align:center;max-width:56ch;margin:0 auto 26px}
.sec-head h2{font-size:clamp(24px,3.4vw,32px);font-weight:850}
.sec-head p{color:var(--ink-dim);margin-top:10px;font-size:16px}
.catgroup{margin-top:26px}
.catgroup h3{font-size:13px;font-weight:800;text-transform:uppercase;letter-spacing:.06em;margin-bottom:13px;display:flex;align-items:center;gap:9px}
.dot{width:9px;height:9px;border-radius:50%}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(216px,1fr));gap:12px}
.case{border:1px solid var(--line);border-radius:14px;padding:15px;background:var(--surface);transition:.15s;text-decoration:none;color:inherit;display:block}
.case:hover{transform:translateY(-2px);box-shadow:var(--shadow);border-color:var(--indigo)}
.case b{font-size:14.5px;font-weight:700;display:block}
.case .spec{font-size:12px;font-weight:700;margin:6px 0 5px;display:inline-block;padding:2px 8px;border-radius:6px}
.case p{font-size:12.5px;color:var(--ink-dim)}

/* breadcrumb (sub-pages) */
.crumb{font-size:13px;color:var(--muted);margin:22px 0 -10px}
.crumb a{color:var(--indigo);text-decoration:none;font-weight:600}
.crumb a:hover{text-decoration:underline}

/* prose / SEO body (sub-pages) */
.prose{max-width:680px;margin:40px auto 0}
.prose h2{font-size:22px;font-weight:800;margin:28px 0 10px}
.prose h3{font-size:16.5px;font-weight:800;margin:22px 0 6px}
.prose p{color:var(--ink-dim);margin:0 0 12px;font-size:15.5px}
.prose ul{color:var(--ink-dim);font-size:15.5px;margin:0 0 14px;padding-left:20px}
.prose li{margin:5px 0}
.prose strong{color:var(--ink)}

/* related links (sub-pages) */
.related{max-width:680px;margin:36px auto 0}
.related h3{font-size:13px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);margin-bottom:12px}
.related .links{display:flex;flex-wrap:wrap;gap:10px}
.related .links a{border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:8px 14px;font-size:13.5px;font-weight:600;text-decoration:none;color:var(--ink);transition:.15s}
.related .links a:hover{border-color:var(--indigo);color:var(--indigo)}

/* app cta */
.appcta{margin:60px 0 0;background:linear-gradient(135deg,#4F46E5,#6366F1);border-radius:26px;padding:42px;color:#fff;
  display:flex;align-items:center;gap:26px;justify-content:space-between;flex-wrap:wrap}
.appcta h2{font-size:clamp(22px,3vw,30px);font-weight:850;max-width:18ch}
.appcta p{opacity:.92;margin-top:10px;max-width:46ch;font-size:15.5px}
.appcta .btn-light{background:#fff;color:var(--indigo);font-size:16px;padding:14px 22px}
.appcta .btn-light:hover{background:#F1F1FE}

/* footer */
footer{margin-top:54px;border-top:1px solid var(--line);padding:30px 0 50px;color:var(--muted);font-size:13.5px}
footer .wrap{display:flex;align-items:center;gap:16px;flex-wrap:wrap}
footer a{color:var(--ink-dim);text-decoration:none;font-weight:600}
footer a:hover{color:var(--ink)}
footer .sp{margin-left:auto}