:root{--ink:#1a2030;--soft:#5b6472;--accent:#4f46e5;--accent-soft:#eef0ff;--ok:#0d9488;--warn:#dc2626;--line:#e5e8ef;--bg:#f7f8fb;--card:#fff}
*{box-sizing:border-box}
body{margin:0;font:16px/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;color:var(--ink);background:var(--bg)}
main{max-width:780px;margin:0 auto;padding:1.2rem 1rem 4rem}
header.site{border-bottom:1px solid var(--line);background:var(--card)}
header.site .inner{max-width:780px;margin:0 auto;padding:.7rem 1rem;display:flex;justify-content:space-between;align-items:center}
header.site a{color:var(--ink);text-decoration:none;font-weight:700;font-size:.95rem}
h1{font-size:1.7rem;line-height:1.3;margin:1.4rem 0 .4rem}
.sub{color:var(--soft);margin:0 0 1.2rem;font-size:1.02rem}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:1.1rem 1.2rem;margin:1rem 0}
label{font-weight:600;font-size:.92rem;display:block;margin-bottom:.35rem}
textarea{width:100%;min-height:96px;padding:.7rem .8rem;font:15px/1.5 ui-monospace,Menlo,Consolas,monospace;border:1px solid var(--line);border-radius:8px;resize:vertical;color:var(--ink)}
textarea:focus{outline:2px solid var(--accent);border-color:transparent}
.row{display:flex;gap:.8rem;flex-wrap:wrap;align-items:flex-end;margin-top:.7rem}
select{padding:.55rem .6rem;border:1px solid var(--line);border-radius:8px;font-size:.95rem;background:#fff;color:var(--ink)}
button.primary{background:var(--accent);border:none;color:#fff;font-size:1rem;font-weight:700;padding:.65rem 1.6rem;border-radius:8px;cursor:pointer}
button.primary:hover{filter:brightness(1.08)}
button.ghost{background:#fff;border:1px solid var(--line);color:var(--soft);font-size:.9rem;padding:.5rem .9rem;border-radius:8px;cursor:pointer}
button.ghost:hover{border-color:var(--accent);color:var(--accent)}
.examples{display:flex;gap:.5rem;flex-wrap:wrap;margin-top:.6rem}
.examples button{font-size:.82rem;padding:.32rem .7rem;border-radius:999px;border:1px solid var(--line);background:#fff;color:var(--soft);cursor:pointer}
.examples button:hover{border-color:var(--accent);color:var(--accent)}
.hint{color:var(--soft);font-size:.84rem;margin-top:.4rem}
.err{color:var(--warn);font-size:.9rem;margin-top:.5rem;display:none}
.results{display:none}
.results.show{display:block}
.big{display:flex;gap:1.4rem;flex-wrap:wrap;align-items:baseline;margin:.4rem 0 .8rem}
.big .main .num{font-size:2.4rem;font-weight:800;color:var(--accent);font-variant-numeric:tabular-nums}
.big .main .lbl{font-size:.85rem;color:var(--soft)}
.big .side .num{font-size:1.35rem;font-weight:700;font-variant-numeric:tabular-nums}
.big .side .lbl{font-size:.78rem;color:var(--soft)}
h2{font-size:1.22rem;margin:2rem 0 .5rem}
h3{font-size:1.02rem;margin:1.3rem 0 .4rem}
.steps ol{padding-left:1.3rem;margin:.5rem 0}
.steps li{margin:.45rem 0}
table.tbl{border-collapse:collapse;width:100%;margin:.6rem 0;font-size:.92rem;font-variant-numeric:tabular-nums}
.tbl th,.tbl td{border:1px solid var(--line);padding:.4rem .6rem;text-align:right}
.tbl th{background:var(--accent-soft);font-weight:600}
.tbl td:first-child,.tbl th:first-child{text-align:center}
.formula{background:var(--accent-soft);border-radius:8px;padding:.9rem 1rem;text-align:center;font-size:1.15rem;font-family:Georgia,"Times New Roman",serif;margin:.8rem 0}
.chart-wrap{overflow-x:auto;margin:.8rem 0}
.chart-wrap svg{display:block;margin:0 auto;max-width:100%}
.legend{font-size:.82rem;color:var(--soft);text-align:center;margin-top:.3rem}
.legend .sw{display:inline-block;width:.8em;height:.8em;border-radius:2px;vertical-align:-.05em;margin:0 .25em 0 .8em}
details{border:1px solid var(--line);border-radius:10px;background:var(--card);margin:.55rem 0;padding:.15rem .2rem}
summary{font-weight:600;cursor:pointer;padding:.6rem .8rem}
details[open] summary{border-bottom:1px solid var(--line);margin-bottom:.5rem}
details .body{padding:.2rem .9rem .7rem;color:var(--ink)}
.cmp{font-size:.95rem}
.cmp th:first-child,.cmp td:first-child{text-align:left}
ul.tight{margin:.4rem 0;padding-left:1.3rem}
ul.tight li{margin:.3rem 0}
.related{display:flex;gap:.55rem;flex-wrap:wrap;margin:.6rem 0}
.related .chip{border:1px solid var(--line);border-radius:999px;padding:.3rem .85rem;font-size:.88rem;color:var(--soft);background:#fff}
.related a.chip{color:var(--accent);text-decoration:none}
.related a.chip:hover{border-color:var(--accent)}
footer{border-top:1px solid var(--line);margin-top:3rem;padding:1.2rem 0 .5rem;color:var(--soft);font-size:.85rem}
.toast{position:fixed;right:16px;bottom:16px;background:#111;color:#fff;padding:.6rem 1rem;border-radius:8px;font-size:.9rem;opacity:0;transition:opacity .25s;pointer-events:none}
.toast.show{opacity:1}
@media(max-width:480px){h1{font-size:1.45rem}.big .main .num{font-size:2rem}}

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