:root{--bg:#f8fafc;--card:#fff;--ink:#0f172a;--muted:#64748b;--line:#e2e8f0;--brand:#0f766e;--brand-soft:#ccfbf1;--ok:#15803d;--ok-soft:#dcfce7;--bad:#b91c1c;--bad-soft:#fee2e2;--warn-soft:#fef3c7;--r:14px}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;-webkit-text-size-adjust:100%}
a{color:var(--brand)}
.top{position:sticky;top:0;z-index:5;display:flex;align-items:center;justify-content:space-between;padding:10px 16px;padding-top:max(10px,env(safe-area-inset-top));background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.brand{display:flex;gap:8px;align-items:center;text-decoration:none;color:var(--ink);font-weight:700}
.top-link{text-decoration:none;font-size:.95rem}
main{max-width:760px;margin:0 auto;padding:16px}
.pad{padding:16px}.narrow{max-width:680px;margin:0 auto}
.muted{color:var(--muted)}
h1{font-size:1.5rem;line-height:1.25;margin:.2em 0 .4em}h2{font-size:1.15rem;margin:1.4em 0 .5em}h3{font-size:1rem;margin:.8em 0 .3em}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:16px;margin:12px 0;box-shadow:0 1px 2px rgba(15,23,42,.04)}
.mod-card{display:block;text-decoration:none;color:inherit}
.mod-card:active{transform:scale(.99)}
.tag{display:inline-block;font-size:.75rem;font-weight:600;color:var(--brand);background:var(--brand-soft);border-radius:999px;padding:2px 10px}
.meta{font-size:.85rem;color:var(--muted);margin-top:6px}
.bar{height:6px;background:var(--line);border-radius:6px;overflow:hidden;margin-top:10px}.bar>i{display:block;height:100%;background:var(--brand)}
.tabs{display:flex;gap:6px;overflow-x:auto;position:sticky;top:53px;z-index:4;background:var(--bg);padding:8px 0;margin:0 -2px;scrollbar-width:none}
.tabs a{flex:0 0 auto;padding:8px 14px;border-radius:999px;border:1px solid var(--line);background:#fff;text-decoration:none;color:var(--ink);font-size:.92rem}
.tabs a.on{background:var(--brand);border-color:var(--brand);color:#fff}
ul.clean{padding-left:1.2em;margin:.3em 0}ul.clean li{margin:.25em 0}
ol.steps{padding-left:1.3em}ol.steps li{margin:.35em 0}
.callout{background:var(--brand-soft);border-radius:var(--r);padding:14px 16px;margin:12px 0}
.warn{background:var(--warn-soft);border-radius:10px;padding:10px 12px;margin-top:8px;font-size:.93rem}
.disc{background:var(--warn-soft);border-radius:var(--r);padding:12px 14px;font-size:.9rem;margin:16px 0}
details.row{border:1px solid var(--line);border-radius:var(--r);background:#fff;margin:10px 0}
details.row>summary{cursor:pointer;padding:14px 16px;font-weight:600;list-style:none;display:flex;justify-content:space-between;gap:8px}
details.row>summary::-webkit-details-marker{display:none}
details.row>summary::after{content:"+";color:var(--muted);font-weight:400}
details.row[open]>summary::after{content:"–"}
details.row>div{padding:0 16px 14px}
.sub{font-weight:400;color:var(--muted);font-size:.85rem;display:block}
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);background:#fff}
table{border-collapse:collapse;width:100%;min-width:720px;font-size:.88rem}th,td{border-bottom:1px solid var(--line);padding:8px 10px;text-align:left;vertical-align:top}th{background:#f1f5f9;position:sticky;top:0}
td ul{margin:0;padding-left:1.1em}
.view-toggle{display:flex;gap:6px;margin:8px 0}
.btn{appearance:none;border:1px solid var(--line);background:#fff;color:var(--ink);border-radius:12px;padding:10px 16px;font:inherit;font-weight:600;cursor:pointer}
.btn.primary{background:var(--brand);border-color:var(--brand);color:#fff}
.btn.small{padding:6px 12px;font-size:.88rem}
.btn:disabled{opacity:.5}
.btn-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}
.flip{perspective:1200px;margin:12px 0;cursor:pointer;user-select:none}
.flip-in{position:relative;min-height:230px;transition:transform .45s;transform-style:preserve-3d}
.flip.on .flip-in{transform:rotateY(180deg)}
.face{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:20px;border-radius:var(--r);border:1px solid var(--line);background:#fff;font-size:1.1rem}
.face.back{transform:rotateY(180deg);background:#f0fdfa;font-size:1rem}
.face small{position:absolute;top:10px;left:14px;color:var(--muted);font-size:.75rem;text-transform:uppercase;letter-spacing:.05em}
.opt{display:flex;gap:10px;align-items:flex-start;width:100%;text-align:left;border:1px solid var(--line);background:#fff;border-radius:12px;padding:12px;margin:8px 0;font:inherit;cursor:pointer;color:var(--ink)}
.opt .mk{flex:0 0 22px;height:22px;border:2px solid #94a3b8;border-radius:50%;margin-top:1px}
.opt.sata .mk{border-radius:5px}
.opt.sel{border-color:var(--brand);background:#f0fdfa}.opt.sel .mk{background:var(--brand);border-color:var(--brand)}
.opt.right{border-color:var(--ok);background:var(--ok-soft)}.opt.wrong{border-color:var(--bad);background:var(--bad-soft)}
.opt[disabled]{cursor:default}
.result{border-radius:12px;padding:12px 14px;margin-top:10px}.result.ok{background:var(--ok-soft)}.result.no{background:var(--bad-soft)}
.qhead{display:flex;justify-content:space-between;align-items:center;font-size:.85rem;color:var(--muted)}
.foot{max-width:760px;margin:24px auto 0;padding:16px 16px calc(24px + env(safe-area-inset-bottom));font-size:.8rem;color:var(--muted);text-align:center}
.foot p{margin:.3em 0}
ol.refs{font-size:.88rem;padding-left:1.3em}ol.refs li{margin:.4em 0}
@media (min-width:700px){h1{font-size:1.8rem}}
@media print{.top,.tabs,.foot,.btn-row{display:none}}
table.fit,table.kv{min-width:0}
table.kv th{width:38%;background:#f8fafc;position:static;font-weight:600}
ul.check{list-style:none;padding-left:0}ul.check li{padding-left:1.6em;position:relative;margin:.35em 0}ul.check li::before{content:"✓";position:absolute;left:.2em;color:var(--brand);font-weight:700}
.callout.hook{background:#ede9fe}
details.row h3:first-child{margin-top:.2em}