:root{--bg:#FDFCFA;--surface:#fff;--ink:#111010;--ink2:#514D47;--muted:#8C877F;--line:#EBE8E1;--accent:#FF4A1C;--accent2:#E23A0E;--soft:#FFE7DF;--shadow:6px 6px 0 var(--ink)}
@media(prefers-color-scheme:dark){:root{--bg:#0E0D0C;--surface:#171513;--ink:#F7F3EC;--ink2:#CBC5BA;--muted:#8f887c;--line:#26231f;--accent:#FF6A43;--accent2:#FF7d59;--soft:rgba(255,106,67,.16);--shadow:6px 6px 0 rgba(255,255,255,.14)}}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;line-height:1.5;-webkit-font-smoothing:antialiased}
a{color:inherit}
.topbar{position:sticky;top:0;z-index:9;display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.75rem 1.1rem;background:color-mix(in srgb,var(--bg) 86%,transparent);backdrop-filter:blur(10px);border-bottom:2px solid var(--ink)}
.topbar a.back{font-weight:700;text-decoration:none;font-size:.88rem;border:2px solid var(--ink);border-radius:999px;padding:.4rem .8rem;transition:.14s}
.topbar a.back:hover{background:var(--accent);color:#fff;border-color:var(--accent)}
.topbar .brand{font-weight:850;letter-spacing:-.02em;text-decoration:none;display:flex;gap:.4rem;align-items:center;font-size:.98rem}
.topbar .brand .blob{width:12px;height:12px;border-radius:50%;background:var(--accent);display:inline-block}
.wrap{max-width:660px;margin:2rem auto;padding:0 1.1rem}
.pill{display:inline-block;font-size:.66rem;font-weight:800;text-transform:uppercase;letter-spacing:.08em;background:var(--soft);color:var(--accent);border-radius:999px;padding:.28rem .65rem}
h1.demo-title{font-size:clamp(1.6rem,4vw,2.1rem);font-weight:850;letter-spacing:-.03em;margin:.6rem 0 .35rem}
.demo-sub{color:var(--ink2);margin:0 0 1.5rem;font-size:1.02rem}
.panel{background:var(--surface);border:2px solid var(--ink);border-radius:18px;box-shadow:var(--shadow);padding:1.4rem}
.panel + .panel{margin-top:1.1rem}
label{display:block;font-weight:600;font-size:.85rem;margin:.9rem 0 .35rem}
input,select,textarea,button{font:inherit}
input,select,textarea{width:100%;padding:.7rem .85rem;border:2px solid var(--ink);border-radius:12px;background:var(--bg);color:var(--ink)}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--accent)}
.btn{cursor:pointer;font-weight:750;border:2px solid var(--accent);background:var(--accent);color:#fff;border-radius:999px;padding:.7rem 1.2rem;transition:.14s}
.btn:hover{background:var(--accent2);transform:translateY(-2px)}
.btn:active{transform:translateY(0)}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--ink)}
.btn.ghost:hover{background:var(--ink);color:var(--bg)}
.btn.sm{padding:.45rem .8rem;font-size:.85rem}
.row{display:flex;gap:.6rem;flex-wrap:wrap;align-items:center}
.row.between{justify-content:space-between}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:.7rem}
.result{margin-top:1.2rem}
.big{font-size:clamp(1.8rem,6vw,2.6rem);font-weight:850;letter-spacing:-.02em;color:var(--accent)}
.muted{color:var(--muted)}
.mono{font-family:ui-monospace,"SF Mono",Menlo,Consolas,monospace}
.footer{max-width:660px;margin:1.5rem auto 3rem;padding:0 1.1rem;color:var(--muted);font-size:.82rem}
.footer a{color:var(--accent);text-decoration:none;font-weight:600}
@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}