:root{--bg:#fff;--surface:#F5F5F5;--ink:#171717;--ink2:#757575;--line:#DBDBDB;--primary:#6F01F5;--primary-d:#4C06A1;--head:#190333;--tint:#F7F0FF;--tint2:#E8D6FF;--ok:#096C2A;--warn:#C24100;--err:#CB0101;--tip:#FCB603;--sans:"Hanken Grotesk",-apple-system,BlinkMacSystemFont,"Segoe UI",Helvetica,Arial,sans-serif;--mono:ui-monospace,"SF Mono",Menlo,Consolas,monospace}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#12091f;--surface:#1c1230;--ink:#f1ecf9;--ink2:#b3a9c6;--line:#34264d;--primary:#a468ff;--primary-d:#c4a0ff;--head:#0b0514;--tint:#241640;--tint2:#34205c}}
:root[data-theme="dark"]{--bg:#12091f;--surface:#1c1230;--ink:#f1ecf9;--ink2:#b3a9c6;--line:#34264d;--primary:#a468ff;--primary-d:#c4a0ff;--head:#0b0514;--tint:#241640;--tint2:#34205c}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.6 var(--sans)}
a{color:var(--primary)}
.top{background:var(--head);color:#fff;padding:1.2rem 1rem}
.top .in,.page{max-width:50rem;margin:0 auto;padding:0 1rem}
.top .in{padding:0}
.top .kicker{font:600 .8rem var(--mono);letter-spacing:.08em;text-transform:uppercase;color:#d9c9f5;margin:0 0 .3rem}
.top h1{margin:.1rem 0 .2rem;font-size:clamp(1.5rem,4vw,2.1rem);line-height:1.15}
.top p{margin:0;color:#d9c9f5}
.tabs{display:flex;gap:.4rem;margin:1.2rem 0 0}
.tabs button{font:inherit;font-weight:600;border:0;border-radius:8px 8px 0 0;padding:.55rem 1rem;background:transparent;color:#d9c9f5;cursor:pointer}
.tabs button[aria-selected=true]{background:var(--bg);color:var(--primary)}
.page{padding-bottom:4rem}
nav.crumb{padding:1rem 0;font-size:.9rem;color:var(--ink2)}
h2{margin:2.2rem 0 .5rem;font-size:1.5rem}h3{margin:1.6rem 0 .4rem}
.card{border:1px solid var(--line);border-radius:12px;padding:1rem 1.2rem;margin:1rem 0;background:var(--surface)}
.card.lila{background:var(--tint);border-color:var(--tint2)}
.card.tip{border-left:5px solid var(--tip)}.card.warn{border-left:5px solid var(--warn)}
.steps a.stage{display:flex;gap:.8rem;align-items:center;text-decoration:none;color:inherit;border:1px solid var(--line);border-radius:12px;padding:.8rem 1rem;margin:.6rem 0;background:var(--bg)}
.steps a.stage:hover{border-color:var(--primary)}
.steps .n{font:700 .85rem var(--mono);background:var(--tint);color:var(--primary);border-radius:6px;padding:.2rem .5rem;min-width:2.6rem;text-align:center}
.btn{display:inline-block;background:var(--primary);color:#fff;border:0;border-radius:8px;padding:.5rem 1rem;font:600 .95rem var(--sans);cursor:pointer;text-decoration:none}
.btn:hover{background:var(--primary-d)}.btn.sec{background:transparent;color:var(--primary);border:1px solid var(--primary)}
.code{position:relative;margin:1rem 0}
.code pre{margin:0;max-height:22rem;overflow:auto;white-space:pre-wrap;word-break:break-word;background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:1rem;font:.85rem/1.5 var(--mono)}
.code .bar{display:flex;gap:.5rem;margin-bottom:.4rem}
.check{display:flex;gap:.6rem;align-items:flex-start;margin:.4rem 0}
.check input{margin-top:.45rem;width:1.1rem;height:1.1rem;accent-color:var(--primary)}
.locked{text-align:center;padding:3rem 1rem}
details{border:1px solid var(--line);border-radius:10px;padding:.6rem 1rem;margin:1rem 0}
summary{cursor:pointer;font-weight:600}
table{border-collapse:collapse;width:100%;font-size:.95rem}td,th{border:1px solid var(--line);padding:.4rem .6rem;text-align:left}
footer{color:var(--ink2);font-size:.85rem;padding:2rem 1rem;max-width:50rem;margin:0 auto}
@media(max-width:560px){body{font-size:16px}}

.previewbar{background:var(--tip);color:#171717;text-align:center;padding:.4rem 1rem;font-size:.9rem}.previewbar a{color:#171717}
h2 small{font-weight:400;color:var(--ink2);font-size:.7em}

.zoomfig{margin:0 0 1.2rem}.zoomfig img{width:100%;height:auto;border:1px solid var(--line);border-radius:10px;background:#f5f5f5}
.zoomfig figcaption{font-size:.9rem;color:var(--ink2);margin-top:.4rem}
.lb{position:fixed;inset:0;z-index:50;background:rgba(15,5,30,.92);display:flex;flex-direction:column}
.lbbar{display:flex;gap:.5rem;justify-content:flex-end;padding:.6rem}
.lbbar button{font:600 1rem var(--sans);background:#fff;color:#171717;border:0;border-radius:8px;min-width:2.6rem;height:2.4rem;padding:0 .8rem;cursor:pointer}
.lbstage{flex:1;overflow:hidden;display:flex;align-items:center;justify-content:center;touch-action:none;cursor:grab}
.lbstage img{max-width:96vw;max-height:calc(100vh - 4rem);transform-origin:center center;user-select:none;-webkit-user-drag:none;background:#fff;border-radius:6px}

.top h1.course{font-size:clamp(.85rem,3.1vw,1.6rem);white-space:nowrap}