:root{--cream: #f4f2ed;--cream-2: #efece5;--paper: #fff;--ink: #0c0c0e;--ink-2: #24242a;--muted: #6a6a72;--faint: #9c9ca4;--line: rgba(12,12,18,.08);--dot: rgba(18,18,26,.2);--good: #1f9d57;--good-bg: #e7f6ed;--warn: #b5641b;--bad: #c0392b;--font: "Roboto", system-ui, -apple-system, "Segoe UI", Arial, sans-serif;--mono: "Roboto Mono", ui-monospace, Consolas, monospace;--r-lg: 18px;--r-md: 12px;--pill: 100px;--shadow-sm: 0 1px 2px rgba(20,20,30,.04), 0 6px 16px rgba(20,20,30,.05);--shadow: 0 2px 6px rgba(20,20,30,.05), 0 16px 40px rgba(20,20,30,.08)}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font);font-size:16px;line-height:1.7;color:var(--ink-2);background:var(--cream);-webkit-font-smoothing:antialiased;overflow-x:hidden;min-height:100vh}.qc-bg{position:fixed;top:0;right:0;bottom:0;left:0;z-index:-1;overflow:hidden;pointer-events:none;background:radial-gradient(1100px circle at 80% -5%,#fff 0%,transparent 55%),linear-gradient(180deg,#f7f5f0 0%,var(--cream) 55%,var(--cream-2) 100%)}.qc-bg-grid{position:absolute;top:-10%;right:-10%;bottom:-10%;left:-10%;background-image:radial-gradient(circle,rgba(18,18,26,.05) 1px,transparent 1.4px);background-size:22px 22px;animation:dots 40s linear infinite}.qc-bg-blob{position:absolute;border-radius:50%;background-image:radial-gradient(circle,var(--dot) 1.5px,transparent 1.7px);background-size:15px 15px}.qc-bg-1{width:62vmax;height:62vmax;top:-22vmax;right:-16vmax;-webkit-mask-image:radial-gradient(circle at center,#000 0%,transparent 62%);mask-image:radial-gradient(circle at center,#000 0%,transparent 62%);animation:b1 26s ease-in-out infinite alternate}.qc-bg-2{width:46vmax;height:46vmax;bottom:-18vmax;left:-14vmax;background-size:18px 18px;-webkit-mask-image:radial-gradient(circle at center,#000 0%,transparent 60%);mask-image:radial-gradient(circle at center,#000 0%,transparent 60%);animation:b2 32s ease-in-out infinite alternate}@keyframes b1{0%{transform:translate(0) scale(1);opacity:.85}to{transform:translate(-5vmax,4vmax) scale(1.08);opacity:1}}@keyframes b2{0%{transform:translate(0) scale(1);opacity:.7}to{transform:translate(4vmax,-3vmax) scale(1.1);opacity:.9}}@keyframes dots{0%{background-position:0 0}to{background-position:22px 22px}}@keyframes rise{0%{opacity:0;transform:translateY(18px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.3}}@keyframes spin{to{transform:rotate(360deg)}}.qc-shell{max-width:1120px;margin:0 auto;padding:clamp(24px,3vw,52px) clamp(16px,4vw,40px) 40px;animation:rise .6s ease both}h1{font-weight:900;font-size:clamp(2.2rem,5vw,3.6rem);line-height:1;letter-spacing:-.035em;color:var(--ink);margin-bottom:14px}h2{font-weight:900;font-size:clamp(1.5rem,3vw,2.1rem);letter-spacing:-.03em;color:var(--ink);margin:40px 0 16px}h3{font-weight:700;font-size:1.1rem;color:var(--ink);margin:22px 0 8px}h1 em,h2 em{font-style:normal;color:var(--muted)}p{margin:0 0 16px}a{color:var(--ink);text-decoration:none}.qc-eyebrow{display:inline-flex;align-items:center;gap:9px;font-size:.72rem;font-weight:700;letter-spacing:.2em;text-transform:uppercase;color:var(--muted);margin-bottom:14px}.qc-muted{color:var(--muted)}.qc-small{font-size:.85rem}.qc-dot{width:9px;height:9px;border-radius:50%;background:var(--ink);animation:pulse 2.4s infinite}.qc-hero{padding:8px 0 24px}.qc-hero-lead{color:var(--muted);font-size:clamp(1.05rem,1.5vw,1.25rem);max-width:56ch;margin-bottom:24px}.qc-top{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:10px 0 6px;margin-bottom:8px}.qc-top-left{display:flex;align-items:center;gap:14px}.qc-brand{font-weight:900;letter-spacing:-.02em}.qc-back{font-size:.85rem;font-weight:600;color:var(--muted)}.qc-back:hover{color:var(--ink)}.qc-user{display:flex;align-items:center;gap:10px}.qc-user img{width:32px;height:32px;border-radius:50%}.qc-user-name{font-size:.85rem;font-weight:600}.qc-btn{display:inline-flex;align-items:center;gap:9px;border:0;border-radius:var(--pill);padding:13px 26px;font-family:var(--font);font-size:.92rem;font-weight:700;color:#fff;background:var(--ink);cursor:pointer;text-decoration:none;box-shadow:var(--shadow-sm);transition:transform .2s,box-shadow .2s,background .2s}.qc-btn:hover{transform:translateY(-2px);background:#000;box-shadow:var(--shadow);color:#fff}.qc-btn:disabled{background:var(--cream-2);color:var(--faint);cursor:not-allowed;box-shadow:none;transform:none}.qc-btn-soft{background:var(--paper);color:var(--ink);box-shadow:var(--shadow-sm)}.qc-btn-soft:hover{background:var(--paper);color:var(--ink)}.qc-btn-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:8px}.qc-progress{height:12px;background:#0c0c1214;border-radius:var(--pill);overflow:hidden;max-width:520px}.qc-progress>div{height:100%;border-radius:var(--pill);background:var(--ink);transition:width .6s}.qc-progress-label{font-size:.82rem;font-weight:600;color:var(--muted);margin:18px 0 8px}.qc-card{background:var(--paper);border-radius:var(--r-lg);padding:clamp(22px,3vw,34px);margin-bottom:20px;box-shadow:var(--shadow);animation:rise .6s ease both}.qc-list{list-style:none}.qc-lesson{display:flex;align-items:center;gap:18px;background:var(--paper);border-radius:var(--r-lg);padding:18px 22px;margin-bottom:14px;box-shadow:var(--shadow-sm);color:var(--ink);transition:transform .3s,box-shadow .3s}.qc-lesson.click{cursor:pointer}.qc-lesson.click:hover{transform:translateY(-3px);box-shadow:var(--shadow)}.qc-lesson.locked{opacity:.55;background:var(--cream-2);box-shadow:none;cursor:not-allowed}.qc-num{flex:0 0 auto;width:46px;height:46px;display:grid;place-items:center;border-radius:50%;background:var(--cream);font-weight:800;color:var(--ink)}.qc-lesson.done .qc-num{background:var(--good-bg);color:var(--good)}.qc-lesson.current .qc-num{background:var(--ink);color:#fff}.qc-body{flex:1 1 auto;min-width:0}.qc-title{display:block;font-weight:700;font-size:1.05rem}.qc-meta{display:block;font-size:.78rem;color:var(--muted);margin-top:4px}.qc-badge{font-size:.7rem;font-weight:700;letter-spacing:.05em;text-transform:uppercase;padding:6px 13px;border-radius:var(--pill);white-space:nowrap}.qc-badge.done{background:var(--good-bg);color:var(--good)}.qc-badge.current{background:var(--ink);color:#fff}.qc-badge.locked{background:var(--cream-2);color:var(--faint)}.qc-content{font-size:1.06rem;line-height:1.85}.qc-content p{color:var(--ink-2)}.qc-content strong{color:var(--ink)}.qc-content img{max-width:100%;height:auto;border-radius:var(--r-md);display:block;margin:24px auto;box-shadow:var(--shadow)}.qc-dyk{background:var(--cream);border-radius:var(--r-md);padding:18px 22px;margin:22px 0;border-left:4px solid var(--ink)}.qc-dyk-label{display:block;font-weight:800;font-size:.7rem;text-transform:uppercase;letter-spacing:.12em;color:var(--ink);margin-bottom:5px}.ket{font-family:var(--mono);color:var(--ink);font-weight:500}.qc-q{background:var(--paper);border-radius:var(--r-lg);padding:22px 26px;margin-bottom:18px;box-shadow:var(--shadow-sm)}.qc-q-prompt{font-weight:700;margin-bottom:14px;font-size:1.05rem;color:var(--ink)}.qc-choice{display:flex;align-items:flex-start;gap:12px;padding:12px 16px;border-radius:var(--r-md);background:var(--cream);cursor:pointer;margin-bottom:9px;transition:background .15s}.qc-choice:hover{background:var(--cream-2)}.qc-choice.correct{background:var(--good-bg)}.qc-choice.wrong{background:#fbe6e3}.qc-choice input{margin-top:4px;accent-color:var(--ink)}.qc-explain{margin-top:10px;font-size:.92rem;color:var(--muted)}.qc-score{text-align:center;font-weight:900;font-size:clamp(3.4rem,9vw,5rem);line-height:1;letter-spacing:-.04em}.qc-score.pass{color:var(--good)}.qc-score.fail{color:var(--warn)}.qc-games{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.qc-game{background:var(--paper);border-radius:var(--r-lg);padding:20px 22px;box-shadow:var(--shadow-sm);color:var(--ink);transition:transform .3s,box-shadow .3s}.qc-game.click{cursor:pointer}.qc-game.click:hover{transform:translateY(-3px);box-shadow:var(--shadow)}.qc-game.locked{opacity:.55;background:var(--cream-2);box-shadow:none}.qc-game-sub{font-size:.82rem;color:var(--muted);margin-top:4px}.qc-teaser{background:var(--ink);color:#fff;border-radius:var(--r-lg);padding:20px 24px;margin-bottom:16px;box-shadow:var(--shadow)}.coin-wrap{display:flex;flex-direction:column;align-items:center;gap:8px;margin:10px 0 24px}.coin{width:150px;height:150px;border-radius:50%;display:grid;place-items:center;font-weight:900;font-size:2.4rem;color:#fff;background:linear-gradient(145deg,#2a2a30,#0c0c0e);box-shadow:var(--shadow);border:4px solid #fff}.coin.spinning{animation:spin .5s linear infinite}.coin.heads{background:linear-gradient(145deg,#2bb673,#1f9d57)}.coin.tails{background:linear-gradient(145deg,#5a5a66,#2a2a30)}.tally{display:flex;gap:24px;font-family:var(--mono)}.tally b{font-size:1.6rem}.bars{display:flex;gap:10px;align-items:flex-end;height:120px;margin-top:14px}.bar{width:90px;background:var(--ink);border-radius:8px 8px 0 0;display:flex;align-items:flex-start;justify-content:center;color:#fff;font-family:var(--mono);font-size:.8rem;padding-top:6px;transition:height .4s}.bar.h{background:var(--good)}.gates{display:flex;flex-wrap:wrap;gap:8px;align-items:center;min-height:50px;padding:10px 14px;background:var(--cream);border-radius:var(--r-md);margin:8px 0}.gates .wire{font-family:var(--mono);color:var(--muted);margin-right:6px}.gate-chip{width:42px;height:42px;border-radius:10px;background:var(--ink);color:#fff;font-weight:900;display:grid;place-items:center;font-size:1.1rem}.gate-pick{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin:14px 0}.gate-pick>button:not(.qc-btn){width:48px;height:48px;border-radius:12px;border:0;background:var(--paper);box-shadow:var(--shadow-sm);font-weight:900;font-size:1.1rem;cursor:pointer;color:var(--ink)}.gate-pick>button:not(.qc-btn):hover{background:var(--ink);color:#fff}.bloch-svg{display:block;margin:8px auto 0}.probrow{display:flex;gap:18px;justify-content:center;font-family:var(--mono);margin-top:8px}.goal{background:var(--good-bg);color:#14603a;border-radius:var(--r-md);padding:12px 16px;margin-bottom:14px;font-weight:600}.goal.win{background:var(--ink);color:#fff}.hist{display:flex;gap:14px;align-items:flex-end;height:170px;justify-content:center;margin-top:16px}.hist-col{display:flex;flex-direction:column;align-items:center;gap:6px;height:100%;justify-content:flex-end}.hist-bar{width:64px;background:var(--ink);border-radius:8px 8px 0 0;transition:height .4s;min-height:2px}.hist-bar.on{background:var(--good)}.hist-label{font-family:var(--mono);font-size:.85rem}.game-wrap{max-width:860px;margin:0 auto}.game-lead{max-width:none}.game-actions{display:flex;flex-wrap:wrap;gap:10px;margin:4px 0 18px}.game-about{margin-top:0}.game-about h3{margin-top:0;margin-bottom:8px}.split{display:grid;grid-template-columns:1fr;gap:20px;margin-top:18px;align-items:start}.term{background:#0c0e16;color:#d6dbe6;border-radius:14px;padding:18px;font-family:var(--mono);font-size:.88rem;box-shadow:var(--shadow);border:1px solid #1b2030}.term-bar{display:flex;align-items:center;margin-bottom:14px}.term-dot{width:11px;height:11px;border-radius:50%;margin-right:7px}.term-name{margin-left:6px;color:#8a92a6;font-size:.78rem}.term-code{white-space:pre-wrap;line-height:2.05;word-break:break-word}.term-cm{color:#5c6370}.term-blank{background:#1c2233;border:1px solid #2d3650;color:#7fe7c4;border-radius:6px;padding:1px 6px;font-family:var(--mono);font-size:.84rem;outline:none}.term-blank.ok{border-color:#2bbd7e;color:#5be3a6}.term-blank.bad{border-color:#e0556b;color:#ff9aa6}.hintbtn{margin-left:6px;background:transparent;border:0;cursor:pointer;font-size:1rem;padding:0 2px;line-height:1;opacity:.85}.hintbtn:hover{opacity:1}.term-console{margin-top:14px;border-top:1px solid #1b2030;padding-top:10px;min-height:48px;white-space:pre-wrap;font-size:.82rem}.ln-ok{color:#5be3a6}.ln-err{color:#ff7a8a}.ln-hint{color:#9fb0d0}.term-foot{display:flex;flex-wrap:wrap;gap:10px;margin-top:14px}.term-run{background:#2bbd7e;color:#06121a;border:0;border-radius:8px;padding:9px 18px;font-weight:800;cursor:pointer;font-family:var(--font)}.term-run:disabled{opacity:.6;cursor:default}.term-tell{background:#222a3d;color:#cdd6ea;border:1px solid #344060;border-radius:8px;padding:9px 16px;cursor:pointer;font-family:var(--font)}.locked-panel{display:grid;place-items:center;text-align:center;min-height:320px;background:var(--paper);border-radius:var(--r-lg);box-shadow:var(--shadow-sm);color:var(--muted);padding:30px}.explain-banner{display:flex;align-items:center;justify-content:space-between;gap:12px;background:#fff6e0;border:1px solid #f0d49a;color:#7a5717;border-radius:10px;padding:10px 14px;margin-bottom:12px;font-size:.86rem}.btn-explain{background:#0c0e16;color:#fff;border:0;border-radius:8px;padding:8px 16px;font-weight:700;cursor:pointer;font-family:var(--font);white-space:nowrap}.btn-explain:hover{background:#1b2030}.modal-bg{position:fixed;top:0;right:0;bottom:0;left:0;background:#0c0c128c;display:grid;place-items:center;z-index:1000;padding:18px}.modal{background:#fff;border-radius:18px;max-width:800px;width:100%;max-height:86vh;overflow:auto;box-shadow:var(--shadow-lg);padding:26px 28px}.modal h2{margin:0 0 4px}.modal-x{float:right;background:var(--cream);border:0;width:34px;height:34px;border-radius:9px;cursor:pointer;font-size:1rem;color:var(--ink)}.modal-x:hover{background:var(--cream-2)}.xtable{width:100%;border-collapse:collapse;margin-top:14px}.xtable td{vertical-align:top;padding:13px 12px;border-top:1px solid var(--line)}.xtable td.xc{font-family:var(--mono);font-size:.8rem;color:var(--ink);white-space:pre-wrap;width:42%;background:var(--cream);border-radius:8px}.xtable td.xe{color:var(--ink-2);font-size:.92rem;line-height:1.6}@media(max-width:600px){.xtable td.xc{width:38%}}.qc-flash{border-radius:var(--r-md);padding:13px 18px;margin-bottom:20px;font-weight:500;background:var(--paper);box-shadow:var(--shadow-sm);border-left:4px solid var(--warn)}.qc-center{text-align:center;padding:60px 20px;color:var(--muted)}@media(max-width:600px){.qc-games{grid-template-columns:1fr}.qc-badge{display:none}}