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strong{color:var(--bad)}.quiz-why{border-top:1px solid var(--border);margin-top:14px;padding-top:12px;font-size:15.5px;line-height:24px;overflow:hidden}.quiz-footer{align-items:center;gap:14px;display:flex}.quiz-score{font:600 19px var(--display)}.practice{flex-direction:column;gap:12px;display:flex}.goal{background:var(--surface);border:1px solid var(--fg);border-radius:var(--radius-md);flex-wrap:wrap;justify-content:space-between;gap:16px;padding:16px 20px;display:flex}.goal-text{flex:380px}.goal-kicker{font:600 11px/16px var(--mono);color:var(--accent);text-transform:uppercase;letter-spacing:.08em}.goal h3{margin:4px 0;font-size:21px;font-weight:600;line-height:28px}.goal p{margin:0;font-size:16px}.goal-actions{flex-wrap:wrap;align-items:flex-start;gap:2px;display:flex}.hints{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);margin:0;padding:12px 16px 12px 36px;overflow:hidden}.hints li{margin:4px 0}.solution{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);flex-direction:column;align-items:flex-start;gap:2px;padding:12px 16px;display:flex;overflow:hidden}.sol-line{font:13px var(--mono);color:var(--fg);cursor:pointer;border-radius:var(--radius-xs);background:0 0;border:0;padding:2px 6px}.sol-line:hover{background:var(--surface-2)}.practice-side{flex-direction:column;gap:10px;min-width:0;display:flex}.check{border-radius:var(--radius-sm);padding:10px 14px;font-size:15px;line-height:24px}.check.won{background:var(--surface);border:1px solid var(--good);box-shadow:inset 0 0 0 1px var(--good)}.check.won strong{color:var(--good)}.check.pending{background:var(--surface);border:1px dashed var(--border-strong);color:var(--muted)}.sandbox-head{flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:20px;display:flex}.sandbox-head h1{margin:0;font-size:40px}.sandbox-head p{margin:4px 0 0}.scenarios{flex-wrap:wrap;gap:6px;display:flex}.scenario{font:500 13.5px var(--sans);background:var(--surface);color:var(--fg);border:1px solid var(--border-strong);cursor:pointer;border-radius:999px;padding:5px 12px}.scenario:hover{background:var(--surface-2)}.scenario.on{background:var(--fg);color:var(--bg);border-color:var(--fg)}.scenario-about{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);margin:16px 0 10px;padding:10px 14px}.toggles{flex-wrap:wrap;align-items:center;gap:16px;margin-bottom:12px;font-size:14px;display:flex}.toggles label{cursor:pointer;align-items:center;gap:6px;display:flex}.toggles input{accent-color:var(--accent)}.toggles label.disabled{opacity:.45}.toggles .btn:first-of-type{margin-left:auto}.cheats h1{margin:8px 0 4px;font-size:40px}.search{width:100%;max-width:520px;font:16px var(--sans);border-radius:var(--radius-sm);border:1px solid var(--border-strong);background:var(--surface);color:var(--fg);margin:12px 0 8px;padding:11px 14px}.search:focus{outline:2px solid var(--accent-2);outline-offset:1px}.cheat-group h2{margin:36px 0 12px;font-size:24px}.cheat-list{grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:10px;display:grid}.cheat{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);flex-direction:column;gap:6px;padding:12px 14px;display:flex}.cheat-want{font-weight:600}.cheat-cmd{white-space:pre-wrap;align-self:flex-start;font-size:13px}.cheat-meta{color:var(--muted);flex-wrap:wrap;gap:4px 12px;font-size:13px;display:flex}.danger-tag{color:var(--bad);font:600 11px/18px var(--mono);letter-spacing:.06em;text-transform:uppercase}@media (width<=640px){main{padding:16px 16px 48px}.topbar{padding:10px 16px}.topbar nav a{white-space:nowrap;padding:6px 7px;font-size:14px}.topbar nav .count{display:none}.brand{font-size:0}.how{grid-template-columns:1fr}.how-card+.how-card{border-left:0;border-top:1px solid var(--border);margin-top:16px;padding-left:0}.compare{grid-template-columns:1fr}.nav-card{flex:1;min-width:0}.cheat-list{grid-template-columns:1fr}.lesson-icon{min-width:40px;font-size:32px}}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:.01ms!important;animation-duration:.01ms!important}}.certificate-page{max-width:1040px}.cert-head h1{margin:8px 0 4px}.cert-form label{font:600 13px var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--accent);margin:18px 0 6px;display:block}.cert-row{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.cert-row .search{flex:280px;margin:0}.cert-missing{border-top:1px solid var(--border);margin-top:18px;padding-top:8px}.cert-missing ul{columns:2 320px;column-gap:32px;margin:8px 0 0;padding:0;list-style:none}.cert-missing li{border-bottom:1px solid var(--border);break-inside:avoid;justify-content:space-between;align-items:baseline;gap:12px;padding:6px 0;display:flex}.cert-steps{font:500 12px var(--mono);white-space:nowrap;gap:12px;display:flex}.cert-steps span,.cert-legend span{color:var(--muted)}.cert-steps span.ok,.cert-legend span.ok{color:var(--good);font-weight:600}.cert-legend{color:var(--muted);margin:0 0 4px;font-size:15px}@media (width<=640px){.cert-missing li{flex-direction:column;gap:2px}}.cert-preview{margin:24px 0 0}.cert-preview canvas{border:1px solid var(--border);width:100%;height:auto;box-shadow:var(--shadow-float);display:block}.cert-preview.locked canvas{filter:grayscale(.7)opacity(.6)}.cert-preview figcaption{font:500 13px var(--mono);color:var(--muted);text-align:center;margin-top:8px}