:root{--bg:#F5F7FB;--card:#fff;--text:#172033;--muted:#475569;--primary:#1D4ED8;--teal:#0F766E;--focus:#B45309;--err:#B91C1C;--ok:#0F766E;--line:#D5DCE8;--tint:#EAF0FF}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font:18px/1.5 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
.shell{max-width:480px;margin:0 auto;padding:12px 16px calc(112px + env(safe-area-inset-bottom))}
.shell.nobar{padding-bottom:calc(32px + env(safe-area-inset-bottom))}
.skip{position:absolute;left:-999px}.skip:focus{left:8px;top:8px;background:#fff;padding:8px;z-index:20}
h1{font-size:26px;line-height:1.25;margin:8px 0 12px}
h1:focus,main:focus{outline:none}
.h3{font-size:20px;margin:0 0 8px}
p{margin:0 0 12px;overflow-wrap:anywhere}
.small{font-size:16px;color:var(--muted);margin:8px 0 4px}
:focus-visible{outline:3px solid var(--focus);outline-offset:2px}
.topline{display:flex;align-items:center;gap:8px;font-size:16px;color:var(--muted);min-height:48px}
.topline .crumb{flex:1;min-width:0;overflow-wrap:anywhere}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:10px 18px;border-radius:14px;border:2px solid var(--primary);background:var(--primary);color:#fff;font:600 18px/1.2 inherit;font-family:inherit;text-decoration:none;cursor:pointer;text-align:center}
.btn.second{background:#fff;color:var(--primary)}
.btn.link{border-color:transparent;background:none;color:var(--primary);padding:8px 10px;min-height:48px}
.btn[disabled]{opacity:.5;cursor:not-allowed}
.btn.block{width:100%}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:16px;margin:0 0 14px}
a.card{display:block;color:inherit;text-decoration:none}
a.card:hover{border-color:var(--primary)}
.card .t{font-weight:700;font-size:20px;display:block}
.card .s{color:var(--muted);font-size:16px;display:block}
.rule{background:var(--tint);border-left:5px solid var(--primary);border-radius:10px;padding:12px 14px;font-weight:700;margin:12px 0;overflow-wrap:anywhere}
.trap{border-left:5px solid var(--focus);background:#FFF7ED;border-radius:10px;padding:12px 14px;margin:12px 0}
.steps{list-style:none;padding:0;margin:12px 0}
.steps li{background:#F1F5F9;border-radius:10px;padding:10px 12px;margin:0 0 8px}
.steps li.latest{background:var(--tint);font-weight:700}
.stepper{display:flex;gap:6px;margin:0 0 12px;padding:0;list-style:none;font-size:16px}
.stepper li{flex:1;text-align:center;padding:6px 4px;border-radius:999px;background:#E2E8F0;color:var(--muted)}
.stepper li[aria-current=step]{background:var(--primary);color:#fff;font-weight:700}
.bar{position:fixed;left:0;right:0;bottom:0;background:#fff;border-top:1px solid var(--line);padding:10px 16px calc(10px + env(safe-area-inset-bottom));z-index:10}
.bar-in{max-width:480px;margin:0 auto;display:flex;gap:10px}
.bar-in .btn{flex:1}
.row{display:flex;flex-wrap:wrap;gap:8px;margin:8px 0}
.chip{min-height:48px;min-width:48px;padding:8px 14px;border-radius:999px;border:2px solid var(--line);background:#fff;color:var(--text);font:600 18px/1.2 inherit;font-family:inherit;cursor:pointer}
.chip[aria-pressed=true]{border-color:var(--primary);background:var(--tint);color:var(--primary)}
.chip[aria-pressed=true]::before{content:"✓ "}
.choice{display:flex;align-items:center;gap:12px;min-height:52px;padding:10px 12px;border:2px solid var(--line);border-radius:14px;margin:0 0 8px;background:#fff;cursor:pointer}
.choice input{width:24px;height:24px;flex:none}
.choice:has(input:checked){border-color:var(--primary);background:var(--tint)}
fieldset{border:0;padding:0;margin:0}
legend{padding:0;font-weight:600}
.numrow{display:flex;align-items:center;gap:10px;margin:8px 0}
.numrow input{flex:1;min-width:0;font:inherit;font-size:20px;padding:10px 12px;min-height:52px;border:2px solid var(--muted);border-radius:12px}
.numrow .unit{font-weight:700;font-size:20px}
.fb{border-radius:12px;padding:12px 14px;margin:12px 0;border:2px solid var(--line);background:#fff}
.fb.ok{border-color:var(--ok);background:#ECFDF5}
.fb.retry{border-color:var(--focus);background:#FFF7ED}
.fb.bad{border-color:var(--err);background:#FEF2F2;color:var(--err)}
.fb.show{background:var(--tint);border-color:var(--primary)}
.fb b{display:block}
.hintbox{background:#F1F5F9;border-radius:10px;padding:10px 12px;margin:8px 0}
.topic-ico{font-size:28px;margin-right:6px}
.diagram{width:100%;height:auto;max-height:170px;display:block;margin:8px auto}
.diagram .ln{stroke:#1D4ED8;stroke-width:2;fill:none}.diagram .ln.dim{stroke:#CBD5E1}.diagram .ln.hot{stroke:#B45309;stroke-width:3}
.diagram .lbl{font:600 14px system-ui,sans-serif;fill:#172033}
.diagram .face1{fill:#DBEAFE;stroke:#1D4ED8;stroke-width:2}.diagram .face2{fill:#BFDBFE;stroke:#1D4ED8;stroke-width:2}.diagram .face3{fill:#93C5FD;stroke:#1D4ED8;stroke-width:2}
.diagram .cube{fill:#BFDBFE;stroke:#1D4ED8;stroke-width:1.5}
.diagram .on{fill:#99F6E4}.diagram .off{fill:#fff;fill-opacity:.6}
.activity-text{font-weight:600;min-height:3em}
.badge{display:inline-block;font-size:14px;font-weight:700;padding:2px 10px;border-radius:999px;background:#E2E8F0;color:var(--muted)}
.badge.prog{background:#FEF3C7;color:#92400E}.badge.done{background:#D1FAE5;color:#065F46}
table{border-collapse:collapse;width:100%;font-size:16px;margin:8px 0}
th,td{border:1px solid var(--line);padding:6px 8px;text-align:left;overflow-wrap:anywhere}
details{margin:0 0 10px}summary{cursor:pointer;font-weight:700;min-height:44px;display:flex;align-items:center}
.notice{background:#FFF7ED;border:1px solid var(--focus);border-radius:10px;padding:10px 12px;font-size:16px;margin:0 0 12px}
.progbar{height:8px;background:#E2E8F0;border-radius:99px;overflow:hidden;margin-top:6px}.progbar i{display:block;height:100%;background:var(--teal)}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
.reduce *{animation:none!important;transition:none!important}
@media (forced-colors:active){.chip[aria-pressed=true]{outline:2px solid Highlight}}