:root{--ink:#171717;--muted:#696969;--paper:#f4f1ea;--card:#fff;--red:#c92845;--line:#d9d4ca;--dark:#111}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:Arial,Helvetica,sans-serif}
.topbar{min-height:66px;padding:16px 22px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);background:rgba(244,241,234,.94);position:sticky;top:0;z-index:10}
.topbar a{text-decoration:none;color:var(--ink);font-size:.76rem;font-weight:900;letter-spacing:.08em}.home{color:var(--red)!important}
main{width:min(860px,calc(100% - 28px));margin:0 auto;padding:46px 0 70px}
.hero{text-align:center;margin-bottom:28px}.eyebrow{font-size:.7rem;font-weight:900;letter-spacing:.2em;color:var(--red)}
h1{font-size:clamp(2.8rem,8vw,5.8rem);line-height:.84;margin:13px 0 20px;letter-spacing:-.06em}
.hero p{max-width:650px;margin:0 auto;color:#555;font-size:1.05rem;line-height:1.55}.no-value{display:inline-block;margin-top:18px;padding:8px 12px;border:1px solid var(--ink);font-size:.68rem;font-weight:900;letter-spacing:.12em}
.decoder-card{background:var(--card);border:1px solid var(--line);border-radius:22px;padding:22px;box-shadow:0 12px 34px rgba(0,0,0,.06)}
label{display:block;font-size:.68rem;font-weight:900;letter-spacing:.13em;margin-bottom:16px}
select,input{display:block;width:100%;margin-top:8px;border:1px solid #cfc9bd;border-radius:10px;background:#faf9f6;color:#111;padding:15px 14px;font:800 1rem/1.1 "Courier New",monospace}
input{text-transform:uppercase;font-size:1.2rem;letter-spacing:.08em}button{width:100%;border:0;border-radius:11px;background:var(--red);color:#fff;padding:16px;font-weight:900;letter-spacing:.1em;cursor:pointer}
.result{margin-top:18px;padding:21px;border-radius:14px;background:#121212;color:#fff;min-height:158px}.result-kicker{font-size:.62rem;letter-spacing:.18em;color:#e75a70;font-weight:900}
.result h2{margin:8px 0 7px;font-size:1.7rem}.result p{margin:0;color:#c8c8c8;line-height:1.48}.result .detail{margin-top:12px;padding-top:12px;border-top:1px solid #333;color:#aaa;font-size:.9rem}
.result.good{box-shadow:inset 0 0 0 2px #366f4a}.result.warn{box-shadow:inset 0 0 0 2px #b18a2f}
.notes{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:22px}.notes article{background:#ebe7de;border-radius:15px;padding:18px}.notes b{color:var(--red);font-size:.72rem}.notes h3{font-size:.85rem;letter-spacing:.05em;margin:8px 0}.notes p{font-size:.82rem;line-height:1.42;color:#606060;margin:0}
.supported{margin-top:28px;padding:22px 4px;border-top:1px solid var(--line)}.supported h2{font-size:1rem;letter-spacing:.08em}.supported p{line-height:1.55;color:#555}.supported .small{font-size:.8rem;color:#888}
@media(max-width:680px){.notes{grid-template-columns:1fr}.topbar{padding:14px}.topbar .home{display:none}main{padding-top:30px}.decoder-card{padding:16px}}