:root{color-scheme:dark;--bg:#0d0f13;--surface:#15181e;--surface-2:#1b1f27;--text:#f5f6f8;--muted:#999faa;--line:#292e38;--accent:#b9f227;--accent-ink:#111704;--danger:#ff6969;--shadow:0 24px 70px #0005;--radius:18px;font:15px/1.55 Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
:root[data-theme="light"]{color-scheme:light;--bg:#f4f3ef;--surface:#fff;--surface-2:#ecebe6;--text:#17181b;--muted:#686b72;--line:#d9d8d2;--accent:#8bc900;--accent-ink:#142000;--danger:#d94242;--shadow:0 24px 70px #20230d14}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;min-height:100vh;background:var(--bg);color:var(--text);transition:background .2s,color .2s}button,input,select,textarea{font:inherit}button,.button,.secondary-button{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;border:1px solid transparent;border-radius:11px;padding:.72rem 1rem;background:var(--accent);color:var(--accent-ink);font-weight:760;text-decoration:none;cursor:pointer;transition:transform .15s,filter .15s,border-color .15s}button:hover,.button:hover,.secondary-button:hover{transform:translateY(-1px);filter:brightness(1.04)}button:disabled{cursor:not-allowed;opacity:.5;transform:none}.secondary-button{background:transparent;color:var(--text);border-color:var(--line)}.quiet-button,.icon-button{background:transparent;color:var(--muted);border-color:transparent}.danger-button{background:transparent;color:var(--danger);border-color:color-mix(in srgb,var(--danger),transparent 60%)}
.topbar{position:sticky;z-index:20;top:0;display:flex;align-items:center;justify-content:space-between;min-height:68px;padding:.7rem max(4vw,1rem);background:color-mix(in srgb,var(--bg),transparent 12%);border-bottom:1px solid var(--line);backdrop-filter:blur(18px)}.topbar--landing{position:absolute;width:100%;background:transparent;border:0}.brand{display:flex;align-items:center;gap:.7rem;color:var(--text);font-size:1.05rem;font-weight:850;text-decoration:none}.brand__mark{display:grid;place-items:center;width:38px;height:38px;border-radius:10px;background:var(--accent);color:var(--accent-ink);font-size:.76rem;font-weight:900}.topbar__actions{display:flex;align-items:center;gap:.45rem}.user-name{max-width:220px;margin-right:.6rem;overflow:hidden;color:var(--muted);text-overflow:ellipsis;white-space:nowrap}.icon-button{width:42px;padding:.65rem;font-size:1.05rem}
main{width:min(1180px,calc(100% - 2rem));margin:auto;padding:3.5rem 0 6rem}.welcome{display:grid;grid-template-columns:1fr minmax(260px,440px);align-items:end;gap:2rem;margin-bottom:3.5rem}.welcome h1,.hero h1{margin:.12em 0;font-size:clamp(2.8rem,7vw,6.5rem);font-weight:850;line-height:.94;letter-spacing:-.065em}.welcome__copy{margin:0 0 .7rem;color:var(--muted);font-size:1.12rem}.eyebrow{margin:0 0 .55rem;color:var(--accent);font-size:.73rem;font-weight:850;letter-spacing:.14em;text-transform:uppercase}.notice,.status-message{display:flex;gap:.7rem;align-items:center;margin:0 0 1.5rem;padding:.9rem 1rem;border:1px solid var(--line);border-radius:12px;background:var(--surface)}.notice span,.status-message{color:var(--muted)}.status-message--danger{border-color:color-mix(in srgb,var(--danger),transparent 55%)}
.section-block{margin:0 0 3rem}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:1rem;margin-bottom:1rem}.section-heading h2,.card h2{margin:0;font-size:1.4rem;letter-spacing:-.025em}.section-heading>span,.section-hint{color:var(--muted)}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(245px,1fr));gap:1rem}.dashboard-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem}.card{min-width:0;margin:0;padding:1.35rem;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow)}.card--wide{grid-column:1/-1}.card h3{margin:1rem 0 1.5rem;font-size:1.35rem}.lab-card,.group-card{display:flex;flex-direction:column;min-height:190px}.lab-card h3,.group-card h3{flex:1}.lab-card__meta{display:flex;align-items:center;justify-content:space-between;color:var(--muted);font-size:.85rem}.badge{display:inline-flex;width:max-content;padding:.25rem .58rem;border-radius:100px;background:color-mix(in srgb,var(--accent),transparent 84%);color:var(--accent);font-size:.72rem;font-weight:850;letter-spacing:.08em;text-transform:uppercase}.card-actions,.actions{display:flex;flex-wrap:wrap;gap:.65rem}.empty-state{display:flex;min-height:150px;flex-direction:column;align-items:center;justify-content:center;gap:.3rem;padding:2rem;border:1px dashed var(--line);border-radius:var(--radius);color:var(--muted);text-align:center}.empty-state strong{color:var(--text)}
.defense-panel{display:grid;grid-template-columns:minmax(280px,.8fr) minmax(0,1.4fr);gap:2rem;margin-top:2rem;padding:clamp(1.2rem,4vw,3rem);border:1px solid var(--line);border-radius:26px;background:var(--surface);box-shadow:var(--shadow)}.wheel-column{display:flex;flex-direction:column;align-items:center;text-align:center}.function-wheel{position:relative;display:grid;place-items:center;width:min(310px,75vw);aspect-ratio:1;margin:1rem auto 1.5rem;border:10px solid var(--surface-2);border-radius:50%;background:conic-gradient(#ff6262,#ffb443,#f5e642,#85dc66,#43cdd9,#668aff,#ad6cf0,#f064ad,#ff6262);box-shadow:0 25px 60px #0004,inset 0 0 0 2px #fff4}.function-wheel::before{position:absolute;z-index:2;top:-22px;width:0;height:0;border-right:13px solid transparent;border-left:13px solid transparent;border-top:28px solid var(--text);content:"";filter:drop-shadow(0 4px 3px #0004)}.function-wheel__face{display:grid;place-items:center;width:56%;aspect-ratio:1;padding:1rem;border:7px solid color-mix(in srgb,var(--surface),transparent 12%);border-radius:50%;background:var(--surface);box-shadow:0 5px 25px #0006}.function-wheel__face span{max-width:100%;overflow:hidden;font-size:clamp(.72rem,2vw,1rem);font-weight:850;line-height:1.25;text-overflow:ellipsis}.function-wheel.is-spinning{animation:spin-wheel .85s linear infinite}.function-wheel.is-selected{filter:saturate(.9)}@keyframes spin-wheel{to{transform:rotate(360deg)}}.wheel-status{max-width:360px;color:var(--muted);overflow-wrap:anywhere}.timer{margin:.3rem 0;padding:.45rem .8rem;border-radius:100px;background:var(--surface-2);font-variant-numeric:tabular-nums;font-weight:800}.editor-column textarea{min-height:330px}.result-box:empty{display:none}
.stack-form{display:flex;flex-direction:column;gap:.75rem;margin-top:1rem}.form-row,.split{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.75rem}.split{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}.stack-form label:not(.check){display:flex;flex-direction:column;gap:.35rem;color:var(--muted);font-size:.8rem}input,select,textarea{width:100%;border:1px solid var(--line);border-radius:10px;outline:none;background:var(--bg);color:var(--text);padding:.72rem .8rem;transition:border-color .15s,box-shadow .15s}input:focus,select:focus,textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent),transparent 83%)}textarea{resize:vertical;font:14px/1.55 "SFMono-Regular",Consolas,monospace;tab-size:4}.check{display:flex;align-items:center;gap:.6rem;color:var(--muted)}.check input{width:auto}.list-result a{display:block;margin-top:.65rem;padding:.7rem;border:1px solid var(--line);border-radius:10px;color:var(--text);text-decoration:none}.result-box{max-height:28rem;margin-top:1rem;padding:1rem;overflow:auto;border-radius:10px;background:var(--bg);color:var(--muted);white-space:pre-wrap;font:12px/1.55 "SFMono-Regular",Consolas,monospace}.hidden{display:none!important}
.landing{width:min(1240px,calc(100% - 2rem));padding-top:0}.hero{display:grid;grid-template-columns:minmax(0,1.25fr) minmax(320px,.75fr);align-items:center;gap:4rem;min-height:85vh;padding-top:5rem}.hero h1 span{color:var(--muted)}.hero__copy>p:not(.eyebrow,.hero__note){max-width:650px;color:var(--muted);font-size:1.2rem}.hero__button{margin-top:1.4rem;padding:.9rem 1.15rem}.hero__note{color:var(--muted);font-size:.78rem}.hero-wheel{display:grid;place-items:center}.function-wheel--hero{width:min(390px,38vw);animation:hero-drift 16s linear infinite}.function-wheel--hero .function-wheel__face span{font-size:1.4rem}.function-wheel--hero::before{display:none}@keyframes hero-drift{to{transform:rotate(360deg)}}.feature-strip{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.feature-strip article{padding:2rem;border-right:1px solid var(--line)}.feature-strip article:last-child{border:0}.feature-strip article>span{color:var(--accent);font:700 .75rem monospace}.feature-strip strong{display:block;margin:.65rem 0;font-size:1.05rem}.feature-strip p{margin:0;color:var(--muted)}footer{padding:2rem;color:var(--muted);text-align:center}footer span{padding:0 .4rem}
@media(max-width:800px){.user-name{display:none}.welcome,.hero,.defense-panel{grid-template-columns:1fr}.hero{gap:0;padding-top:7rem}.hero-wheel{order:-1}.function-wheel--hero{width:min(270px,70vw)}.feature-strip{grid-template-columns:1fr}.feature-strip article{border-right:0;border-bottom:1px solid var(--line)}.dashboard-grid{grid-template-columns:1fr}.card--wide{grid-column:auto}.section-heading{align-items:flex-start;flex-direction:column}.form-row{grid-template-columns:1fr}.welcome{margin-bottom:2rem}.welcome h1{font-size:2.8rem}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}.function-wheel,.function-wheel--hero{animation-duration:3s!important}button,.button{transition:none}}

/* Defense workspace: read-only masked source beside the student's answer. */
.repository-browser{display:grid;grid-template-columns:minmax(150px,210px) minmax(0,1fr);height:520px}.repository-files{display:flex;min-width:0;flex-direction:column;gap:.2rem;padding:.55rem;overflow:auto;border-right:1px solid var(--line)}.repository-files>span{padding:.6rem;color:var(--muted);font-size:.75rem}.repository-file{display:block;width:100%;overflow:hidden;padding:.45rem .55rem;border:0;border-radius:7px;background:transparent;color:var(--muted);font:11px/1.35 "SFMono-Regular",Consolas,monospace;text-align:left;text-overflow:ellipsis;white-space:nowrap}.repository-file:hover,.repository-file.is-active{transform:none;background:var(--surface-2);color:var(--text);filter:none}.repository-browser .source-code{height:100%}
.function-wheel__face{position:relative;z-index:3}.wheel-option{position:absolute;z-index:1;top:50%;left:50%;width:72px;overflow:hidden;color:#101216;font-size:10px;font-weight:900;line-height:1.05;text-align:center;text-overflow:ellipsis;text-shadow:0 1px 1px #fff8;white-space:nowrap;pointer-events:none}.candidate-list{display:flex;flex-direction:column;gap:.5rem}.candidate-list button{justify-content:flex-start;text-align:left}.pending-defense h3{overflow-wrap:anywhere;font-size:.95rem}
.defense-panel{grid-template-columns:minmax(250px,.55fr) minmax(0,1.8fr);padding:clamp(1.2rem,3vw,2.4rem)}.workspace-column{min-width:0}.code-workspace{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(320px,.85fr);gap:1rem}.source-pane,.editor-column{min-width:0;overflow:hidden;border:1px solid var(--line);border-radius:14px;background:var(--bg)}.pane-title{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.65rem .85rem;border-bottom:1px solid var(--line);color:var(--text);font-size:.78rem;font-weight:750}.pane-title span:last-child{color:var(--muted);font-weight:500}.source-code{height:520px;margin:0;padding:1rem;overflow:auto;color:var(--text);white-space:pre;tab-size:4;font:13px/1.55 "SFMono-Regular",Consolas,monospace}.source-code code{font:inherit}.editor-column textarea{min-height:430px;border:0;border-radius:0;background:transparent}.editor-column textarea:focus{box-shadow:inset 0 0 0 2px var(--accent)}.editor-column .actions,.editor-column .result-box{margin:.75rem}@media(max-width:1000px){.code-workspace{grid-template-columns:1fr}.source-code{height:380px}}