:root{--bg:#0b0d17;--bg2:#11142280;--card:rgba(255,255,255,.045);--card-solid:#141828;--border:rgba(255,255,255,.09);--text:#e8eaf6;--muted:#9aa0bf;--faint:#6b7194;
--accent:#8b5cf6;--accent2:#22d3ee;--good:#22c55e;--bad:#f43f5e;--warn:#f59e0b;--grad:linear-gradient(135deg,#8b5cf6 0%,#6366f1 45%,#22d3ee 100%);
--shadow:0 10px 40px rgba(0,0,0,.35);--radius:18px;--code-bg:#0d1117}
[data-theme=light]{--bg:#f5f6fb;--bg2:#ffffffcc;--card:rgba(255,255,255,.85);--card-solid:#fff;--border:rgba(20,24,60,.10);--text:#161a33;--muted:#5b6185;--faint:#8a90b0;--shadow:0 10px 30px rgba(30,40,90,.08);--code-bg:#0f1424}
*{box-sizing:border-box}html,body{margin:0}body{font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;-webkit-font-smoothing:antialiased;min-height:100vh;padding-bottom:80px;overflow-x:hidden}
a{color:var(--accent2);text-decoration:none}a:hover{text-decoration:underline}
.bg-glow{position:fixed;inset:0;z-index:-1;pointer-events:none;background:radial-gradient(900px 500px at 10% -10%,rgba(139,92,246,.22),transparent 60%),radial-gradient(800px 500px at 100% 0%,rgba(34,211,238,.14),transparent 60%),radial-gradient(700px 600px at 50% 120%,rgba(99,102,241,.12),transparent 60%)}
[data-theme=light] .bg-glow{opacity:.55}
.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:20px;padding:12px 28px;background:var(--bg2);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid var(--border)}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;font-size:19px;color:var(--text);letter-spacing:-.02em}.brand:hover{text-decoration:none}
.brand b{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}.logo{display:grid;place-items:center;width:32px;height:32px;border-radius:10px;background:var(--grad);color:#fff;font-size:15px;box-shadow:0 4px 18px rgba(139,92,246,.45)}
.nav{display:flex;gap:4px;flex:1}.nav a{color:var(--muted);padding:7px 13px;border-radius:10px;font-weight:500;font-size:14.5px;display:flex;align-items:center;gap:6px}.nav a:hover{color:var(--text);background:var(--card);text-decoration:none}.nav a.active{color:var(--text);background:var(--card);box-shadow:inset 0 0 0 1px var(--border)}
.pill-count{background:var(--bad);color:#fff;font-size:11px;font-weight:700;border-radius:20px;padding:0 7px;line-height:18px}.pill-count:empty{display:none}
.top-actions{display:flex;align-items:center;gap:10px}.streak-chip{font-size:14px;padding:5px 11px;border-radius:20px;background:var(--card);border:1px solid var(--border)}
.icon-btn{background:var(--card);border:1px solid var(--border);color:var(--text);width:36px;height:36px;border-radius:10px;cursor:pointer;font-size:16px}
.btn{font:inherit;font-weight:600;border:1px solid var(--border);background:var(--card);color:var(--text);padding:11px 20px;border-radius:12px;cursor:pointer;transition:transform .12s,box-shadow .2s,opacity .2s;display:inline-flex;align-items:center;gap:8px;justify-content:center}
.btn:hover{transform:translateY(-1px)}.btn:active{transform:translateY(0)}.btn:disabled{opacity:.4;cursor:not-allowed;transform:none}
.btn-primary{background:var(--grad);border:0;color:#fff;box-shadow:0 6px 24px rgba(139,92,246,.4)}.btn-primary:hover{box-shadow:0 8px 30px rgba(139,92,246,.55)}
.btn-ghost{background:transparent}.btn-sm{padding:7px 14px;font-size:14px;border-radius:10px}.btn-lg{padding:15px 28px;font-size:16.5px;border-radius:14px}
.view{max-width:1180px;margin:0 auto;padding:28px 24px 40px}.loading{padding:80px;text-align:center;color:var(--muted)}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);backdrop-filter:blur(10px)}
.grid{display:grid;gap:18px}.g2{grid-template-columns:repeat(2,minmax(0,1fr))}.g3{grid-template-columns:repeat(3,minmax(0,1fr))}.g4{grid-template-columns:repeat(4,minmax(0,1fr))}
.muted{color:var(--muted)}.faint{color:var(--faint)}.small{font-size:13.5px}.tiny{font-size:12px}
h1,h2,h3{letter-spacing:-.025em;line-height:1.25}h1{font-size:34px;margin:0 0 6px;font-weight:800}h2{font-size:22px;margin:0 0 12px}h3{font-size:17px;margin:0 0 8px}
.eyebrow{text-transform:uppercase;letter-spacing:.12em;font-size:11.5px;font-weight:700;color:var(--muted)}
.gradient-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
/* hero */
.hero{display:grid;grid-template-columns:1.5fr 1fr;gap:18px;margin-bottom:18px}
.hero-main{position:relative;overflow:hidden;padding:30px}.hero-main:before{content:"";position:absolute;inset:0;background:linear-gradient(135deg,rgba(139,92,246,.20),rgba(34,211,238,.06) 60%,transparent);pointer-events:none}
.hero-main>*{position:relative}.today-title{font-size:26px;font-weight:800;margin:10px 0 8px;letter-spacing:-.03em}
.chips{display:flex;flex-wrap:wrap;gap:8px;align-items:center}.chip{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;font-weight:600;padding:4px 11px;border-radius:20px;background:var(--card);border:1px solid var(--border);color:var(--muted)}
.chip.topic{color:#fff;border:0}.reason{font-size:13.5px;color:var(--muted);margin:12px 0 18px;display:flex;gap:8px;align-items:flex-start}.reason:before{content:"✦";color:var(--accent2)}
.diff{display:inline-flex;gap:3px;vertical-align:middle}.diff i{width:7px;height:7px;border-radius:50%;background:var(--border)}.diff i.on{background:var(--warn)}
.level-card{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;gap:6px}
.ring{position:relative;width:170px;height:170px}.ring svg{transform:rotate(-90deg)}.ring .val{position:absolute;inset:0;display:grid;place-items:center;align-content:center}
.ring .num{font-size:40px;font-weight:800;letter-spacing:-.04em;line-height:1}.ring .lbl{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.1em;margin-top:4px}
.stat{padding:18px 20px}.stat .k{font-size:12px;color:var(--muted);text-transform:uppercase;letter-spacing:.09em;font-weight:600}.stat .v{font-size:28px;font-weight:800;letter-spacing:-.03em;margin-top:2px}.stat .s{font-size:12.5px;color:var(--faint)}
.row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.between{justify-content:space-between}.mt{margin-top:18px}.mt2{margin-top:28px}.mb{margin-bottom:18px}
.list{display:flex;flex-direction:column;gap:8px}.li{display:flex;align-items:center;gap:12px;padding:12px 14px;border-radius:12px;background:var(--card);border:1px solid var(--border);color:var(--text);cursor:pointer}.li:hover{text-decoration:none;border-color:rgba(139,92,246,.5)}
.li .grow{flex:1;min-width:0}.li .t{font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.score{font-weight:700;font-variant-numeric:tabular-nums}
.score.good{color:var(--good)}.score.mid{color:var(--warn)}.score.bad{color:var(--bad)}
.bar{height:8px;border-radius:8px;background:var(--border);overflow:hidden}.bar>i{display:block;height:100%;border-radius:8px;background:var(--grad);transition:width .8s cubic-bezier(.2,.8,.2,1)}
.review-cta{display:flex;align-items:center;gap:16px}.review-cta .big{font-size:42px;font-weight:800;letter-spacing:-.04em}
/* lesson */
.lesson-wrap{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:26px;align-items:start}
.lesson-head{margin-bottom:22px}.lesson-head h1{font-size:32px}.toc{position:sticky;top:84px}.toc a{display:block;color:var(--muted);font-size:13.5px;padding:6px 10px;border-left:2px solid var(--border)}.toc a:hover{color:var(--text);text-decoration:none;border-color:var(--accent)}
.progress-top{position:sticky;top:61px;z-index:15;height:3px;background:transparent;margin:-28px -24px 24px}.progress-top i{display:block;height:100%;background:var(--grad);width:0;transition:width .3s}
.md{font-size:16.2px}.md p{margin:0 0 14px}.md ul,.md ol{padding-left:22px;margin:0 0 14px}.md li{margin:4px 0}.md strong{color:var(--text)}
.md code{font-family:'JetBrains Mono',monospace;font-size:.86em;background:rgba(139,92,246,.14);padding:2px 6px;border-radius:6px}
.md pre{background:var(--code-bg);border:1px solid var(--border);border-radius:12px;padding:14px;overflow:auto}.md pre code{background:none;padding:0;color:#e6edf3}
.md table{border-collapse:collapse;width:100%;margin:6px 0 16px;font-size:14.5px;display:block;overflow-x:auto}.md th,.md td{border:1px solid var(--border);padding:8px 11px;text-align:left;vertical-align:top}.md th{background:rgba(139,92,246,.10)}
.section{margin-bottom:18px}.section h2{display:flex;align-items:center;gap:10px}.section h2 .n{font-size:12px;width:26px;height:26px;border-radius:8px;display:grid;place-items:center;background:var(--grad);color:#fff;flex:none}
.codebox{border-radius:16px;overflow:hidden;border:1px solid var(--border);background:var(--code-bg)}.codebox .bar2{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;background:rgba(255,255,255,.04);border-bottom:1px solid rgba(255,255,255,.07);color:#aab;font-size:13px}
.codebox .dots{display:flex;gap:6px}.codebox .dots i{width:11px;height:11px;border-radius:50%;background:#ff5f57}.codebox .dots i:nth-child(2){background:#febc2e}.codebox .dots i:nth-child(3){background:#28c840}
.codebox pre{margin:0;padding:16px 18px;overflow:auto;font-family:'JetBrains Mono',monospace;font-size:13.5px;line-height:1.55}.codebox pre code.hljs{background:none;padding:0}
.takeaways{list-style:none;padding:0;margin:0;display:grid;gap:10px}.takeaways li{display:flex;gap:10px;align-items:flex-start}.takeaways li:before{content:"✓";flex:none;width:22px;height:22px;border-radius:7px;display:grid;place-items:center;background:rgba(34,197,94,.15);color:var(--good);font-size:13px;font-weight:700;margin-top:2px}
.q{margin-bottom:16px;border-left:3px solid transparent;transition:border-color .3s}.q.done-good{border-left-color:var(--good)}.q.done-bad{border-left-color:var(--bad)}.q.done-free{border-left-color:var(--accent2)}
.q-prompt{font-weight:600;font-size:16.5px;margin:6px 0 14px}.opts{display:grid;gap:9px}
.opt{text-align:left;font:inherit;font-size:15px;color:var(--text);background:var(--card);border:1px solid var(--border);border-radius:12px;padding:12px 15px;cursor:pointer;display:flex;gap:12px;align-items:flex-start;transition:all .15s}
.opt:hover:not(:disabled){border-color:rgba(139,92,246,.6);background:rgba(139,92,246,.08)}.opt .letter{flex:none;width:24px;height:24px;border-radius:7px;display:grid;place-items:center;font-size:12px;font-weight:700;background:var(--border)}
.opt.sel{border-color:var(--accent);background:rgba(139,92,246,.14)}.opt.sel .letter{background:var(--accent);color:#fff}
.opt.right{border-color:var(--good);background:rgba(34,197,94,.12)}.opt.right .letter{background:var(--good);color:#fff}.opt.wrong{border-color:var(--bad);background:rgba(244,63,94,.12)}.opt.wrong .letter{background:var(--bad);color:#fff}.opt:disabled{cursor:default}
.conf{display:flex;gap:6px;flex-wrap:wrap;align-items:center;margin-top:14px}.conf .lab{font-size:13px;color:var(--muted);margin-right:4px}
.conf button{font:inherit;font-size:12.5px;font-weight:600;padding:6px 11px;border-radius:20px;border:1px solid var(--border);background:transparent;color:var(--muted);cursor:pointer}.conf button.sel{background:var(--accent);border-color:var(--accent);color:#fff}
textarea,input[type=text],select{width:100%;font:inherit;font-size:15px;color:var(--text);background:rgba(0,0,0,.18);border:1px solid var(--border);border-radius:12px;padding:12px 14px;resize:vertical;outline:none}
[data-theme=light] textarea,[data-theme=light] input[type=text],[data-theme=light] select{background:#fff}textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(139,92,246,.2)}
.fb{margin-top:14px;padding:14px 16px;border-radius:12px;font-size:15px;animation:pop .35s ease}.fb.good{background:rgba(34,197,94,.10);border:1px solid rgba(34,197,94,.35)}.fb.bad{background:rgba(244,63,94,.10);border:1px solid rgba(244,63,94,.35)}.fb.info{background:rgba(34,211,238,.07);border:1px solid rgba(34,211,238,.3)}
.rubric{list-style:none;padding:0;margin:10px 0;display:grid;gap:7px}.rubric label{display:flex;gap:10px;align-items:flex-start;cursor:pointer;padding:8px 10px;border-radius:10px;border:1px solid var(--border)}.rubric input{margin-top:5px;accent-color:var(--accent);width:16px;height:16px}.rubric label.hit{border-color:rgba(34,197,94,.5);background:rgba(34,197,94,.07)}
.interview{background:linear-gradient(135deg,rgba(249,115,22,.10),rgba(139,92,246,.08));border-color:rgba(249,115,22,.3)}.timer{font-variant-numeric:tabular-nums;font-weight:700;color:var(--warn)}
.seg{display:inline-flex;background:var(--card);border:1px solid var(--border);border-radius:12px;padding:4px;gap:4px;flex-wrap:wrap}.seg button{font:inherit;font-weight:600;font-size:14px;border:0;background:transparent;color:var(--muted);padding:8px 14px;border-radius:9px;cursor:pointer}.seg button.sel{background:var(--grad);color:#fff}
.finish{text-align:center;padding:30px}
/* review */
.flash{max-width:760px;margin:0 auto}.flash .card{padding:28px}.grade-btns{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:16px}.grade-btns button{padding:12px 6px;flex-direction:column;gap:2px}.grade-btns small{font-weight:500;color:var(--muted);font-size:11.5px}
.g-again{border-color:rgba(244,63,94,.5)!important}.g-hard{border-color:rgba(245,158,11,.5)!important}.g-good{border-color:rgba(34,197,94,.5)!important}.g-easy{border-color:rgba(34,211,238,.5)!important}
.empty{text-align:center;padding:50px 20px}.empty .em{font-size:54px}
/* charts */
.chart svg{width:100%;height:auto;display:block}.chart text{fill:var(--muted);font-size:11px;font-family:Inter}
.heat{display:grid;grid-auto-flow:column;grid-template-rows:repeat(7,13px);gap:3px;overflow-x:auto;padding-bottom:4px}.heat i{width:13px;height:13px;border-radius:3px;background:var(--border)}
.heat i.l1{background:rgba(139,92,246,.35)}.heat i.l2{background:rgba(139,92,246,.6)}.heat i.l3{background:#8b5cf6}.heat i.l4{background:#22d3ee}
table.tbl{width:100%;border-collapse:collapse;font-size:14.5px}.tbl th{text-align:left;color:var(--muted);font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.08em;padding:8px 10px;border-bottom:1px solid var(--border)}.tbl td{padding:11px 10px;border-bottom:1px solid var(--border)}.tbl tr.click{cursor:pointer}.tbl tr.click:hover td{background:var(--card)}
.topic-card{position:relative;overflow:hidden}.topic-card .ic{font-size:24px}.topic-card .stripe{position:absolute;left:0;top:0;bottom:0;width:4px}
.lchip{display:flex;align-items:center;gap:8px;padding:7px 10px;border-radius:10px;font-size:13.5px;color:var(--text);border:1px solid var(--border);margin-top:6px}.lchip:hover{text-decoration:none;border-color:var(--accent)}.lchip .st{margin-left:auto;font-size:12px}
.answer-block{border:1px solid var(--border);border-radius:12px;padding:14px;margin-bottom:12px}.answer-block pre{white-space:pre-wrap;font-family:inherit;margin:6px 0;background:rgba(0,0,0,.15);padding:10px;border-radius:8px}
/* modal + toast */
.modal{position:fixed;inset:0;z-index:50;background:rgba(5,6,15,.6);backdrop-filter:blur(6px);display:grid;place-items:center;padding:20px}.modal.hidden{display:none}
.modal-card{background:var(--card-solid);border:1px solid var(--border);border-radius:22px;max-width:520px;width:100%;padding:30px;box-shadow:0 30px 80px rgba(0,0,0,.5);animation:pop .35s cubic-bezier(.2,.9,.3,1.3);text-align:center}
.toast{position:fixed;left:50%;bottom:96px;transform:translateX(-50%) translateY(20px);opacity:0;background:var(--card-solid);border:1px solid var(--border);padding:11px 18px;border-radius:12px;box-shadow:var(--shadow);transition:all .3s;z-index:60;font-weight:500;pointer-events:none}.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}
@keyframes pop{from{opacity:0;transform:scale(.96) translateY(6px)}to{opacity:1;transform:none}}
.fade-in{animation:pop .4s ease both}
.bottom-nav{display:none}
@media (max-width:900px){.hero,.lesson-wrap{grid-template-columns:minmax(0,1fr)}.toc{display:none}.g4{grid-template-columns:repeat(2,minmax(0,1fr))}.g3{grid-template-columns:1fr 1fr}}
@media (max-width:720px){.nav,.top-actions .btn,.top-actions .icon-btn{display:none}.topbar{padding:10px 16px}.view{padding:18px 14px 30px}.progress-top{margin:-18px -14px 18px;top:57px}
 h1{font-size:26px}.lesson-head h1{font-size:25px}.today-title{font-size:21px}.g2,.g3{grid-template-columns:1fr}.card{padding:18px}.hero-main{padding:22px}.md{font-size:15.5px}
 .bottom-nav{display:flex;position:fixed;bottom:0;left:0;right:0;z-index:30;background:var(--bg2);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-top:1px solid var(--border);padding:6px 4px calc(6px + env(safe-area-inset-bottom))}
 .bottom-nav a{flex:1;display:flex;flex-direction:column;align-items:center;font-size:11px;color:var(--muted);gap:1px;position:relative}.bottom-nav a span{font-size:19px;line-height:1.2}.bottom-nav a.active{color:var(--text)}
 .bottom-nav a i{position:absolute;top:0;right:22%;background:var(--bad);color:#fff;font-style:normal;font-size:10px;border-radius:10px;padding:0 5px;font-weight:700}.bottom-nav a i:empty{display:none}
 .bn-next span{background:var(--grad);color:#fff;width:40px;height:40px;border-radius:14px;display:grid;place-items:center;margin-top:-16px;box-shadow:0 6px 20px rgba(139,92,246,.5)}
 .grade-btns{grid-template-columns:repeat(2,1fr)}.ring{width:140px;height:140px}.ring svg{width:140px;height:140px}}

.lesson-wrap>div{min-width:0}.codebox,.md pre{max-width:100%}

/* videos */
.video-card{margin-bottom:18px;position:relative;overflow:hidden;background:linear-gradient(135deg,rgba(239,68,68,.07),rgba(139,92,246,.07) 55%,transparent),var(--card)}
.video-card.watched{border-color:rgba(34,197,94,.45)}.chip-good{color:var(--good)!important;border-color:rgba(34,197,94,.45)!important}
.video-title{font-size:18.5px;margin:10px 0 4px}.video-why{color:var(--muted);margin:0 0 14px;font-size:15px}
.video-frame{position:relative;aspect-ratio:16/9;width:100%;border-radius:14px;overflow:hidden;background:#000;cursor:pointer;border:1px solid var(--border);box-shadow:0 12px 40px rgba(0,0,0,.35)}
.video-frame img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .5s ease,filter .3s}
.video-frame:hover img{transform:scale(1.03);filter:brightness(.85)}.video-frame:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
.video-shade{position:absolute;inset:0;background:linear-gradient(180deg,transparent 45%,rgba(0,0,0,.55))}
.video-play{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:74px;height:74px;border-radius:50%;display:grid;place-items:center;background:var(--grad);box-shadow:0 10px 34px rgba(139,92,246,.6),0 0 0 8px rgba(255,255,255,.12);transition:transform .2s}
.video-play svg{margin-left:4px}.video-frame:hover .video-play{transform:translate(-50%,-50%) scale(1.08)}
.video-seg{position:absolute;left:12px;bottom:12px;color:#fff;font-size:12.5px;font-weight:600;background:rgba(0,0,0,.6);padding:4px 10px;border-radius:8px;backdrop-filter:blur(4px)}
.video-frame iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.video-actions{margin-top:12px}.video-actions .faint{margin-left:auto}
@media (max-width:720px){.video-play{width:58px;height:58px}.video-title{font-size:16.5px}.video-actions .faint{margin-left:0;width:100%}}
/* ---------- glossary / key terms ---------- */
.lesson-wrap{grid-template-columns:minmax(0,1fr) 330px}
.side{position:sticky;top:78px;padding:0;display:flex;flex-direction:column;max-height:calc(100vh - 96px);overflow:hidden}
.side-tabs{display:flex;gap:4px;padding:8px;border-bottom:1px solid var(--border)}
.side-tabs button{flex:1;font:inherit;font-size:13px;font-weight:600;border:0;background:transparent;color:var(--muted);padding:8px 10px;border-radius:9px;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:6px}
.side-tabs button.sel{background:var(--card-solid);color:var(--text);box-shadow:inset 0 0 0 1px var(--border)}
.side-tabs .pill-count{background:var(--accent);color:#fff;font-size:11px;border-radius:10px;padding:0 6px}
.side-body{overflow-y:auto;padding:12px 14px;flex:1;min-height:0;scrollbar-width:thin}.side-body.hidden{display:none}
.side-body.toc a{display:block;color:var(--muted);font-size:13.5px;padding:6px 10px;border-left:2px solid var(--border)}.side-body.toc a:hover{color:var(--text);text-decoration:none;border-color:var(--accent)}
.side-foot{padding:12px 14px;border-top:1px solid var(--border)}
.side-hint{margin:0 2px 10px}
.term{border-bottom:2px dotted var(--accent);cursor:help;border-radius:3px;padding:0 1px;transition:background .15s}
.term:hover,.term:focus{background:rgba(139,92,246,.16);outline:none}
.term.learning{border-bottom-color:var(--warn);background:rgba(245,158,11,.10)}.term.known{border-bottom-style:solid;border-bottom-color:rgba(34,197,94,.55)}
.term.demo{cursor:default}
.gt{border:1px solid var(--border);border-radius:12px;padding:11px 12px;margin-bottom:9px;background:var(--card);transition:border-color .25s,box-shadow .25s,background .25s;position:relative}
.gt.hl{border-color:var(--accent);box-shadow:0 0 0 3px rgba(139,92,246,.22);background:rgba(139,92,246,.08)}
.gt.pinned{border-color:var(--accent2);box-shadow:0 0 0 2px rgba(34,211,238,.25)}
.gt-h{display:flex;justify-content:space-between;align-items:flex-start;gap:8px}.gt-h b{font-size:14.5px;line-height:1.35}
.gt-st{font-size:10.5px;font-weight:700;border-radius:10px;padding:1px 8px;white-space:nowrap;flex:none}.gt-st:empty{display:none}
.gt-st.known{background:rgba(34,197,94,.15);color:var(--good)}.gt-st.learning{background:rgba(245,158,11,.16);color:var(--warn)}
.gt-def{margin:6px 0 0;font-size:13.5px;line-height:1.5}.gt-pr{margin:6px 0 0;font-size:12.5px;color:var(--muted);line-height:1.45}
.gt-rel{margin-top:7px;display:flex;flex-wrap:wrap;gap:5px;align-items:center}
.rel{font:inherit;font-size:11.5px;font-weight:600;border:1px solid var(--border);background:transparent;color:var(--accent2);border-radius:20px;padding:1px 9px;cursor:pointer}.rel:hover{border-color:var(--accent2);text-decoration:none}
.gt-btns{display:flex;gap:6px;margin-top:9px}
.gt-btns button{flex:1;font:inherit;font-size:12px;font-weight:600;padding:5px 8px;border-radius:9px;border:1px solid var(--border);background:transparent;color:var(--muted);cursor:pointer}
.gt-btns button:hover{color:var(--text)}
.gt-btns [data-set=known].on{background:rgba(34,197,94,.16);border-color:rgba(34,197,94,.6);color:var(--good)}
.gt-btns [data-set=learning].on{background:rgba(245,158,11,.16);border-color:rgba(245,158,11,.6);color:var(--warn)}
.pin-x{position:absolute;top:6px;right:8px;border:0;background:transparent;color:var(--muted);font-size:18px;cursor:pointer;line-height:1}
.pinned .gt-h{padding-right:18px}
.chip-btn{cursor:pointer;font:inherit;font-size:12.5px;font-weight:600}.chip-btn:hover{color:var(--text);border-color:var(--accent)}
.gloss-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:12px;align-items:start}.gloss-grid .gt{margin:0;padding:16px}
.gloss-grid .gt.hl{border-color:var(--accent)}
.sheet{position:fixed;inset:0;z-index:60;background:rgba(5,6,15,0);pointer-events:none;transition:background .2s}
.sheet.open{background:rgba(5,6,15,.5);pointer-events:auto}
.sheet-card{position:absolute;left:0;right:0;bottom:0;max-height:72vh;overflow:hidden;display:flex;flex-direction:column;background:var(--card-solid);border-top:1px solid var(--border);border-radius:20px 20px 0 0;padding:8px 16px calc(16px + env(safe-area-inset-bottom));transform:translateY(105%);transition:transform .25s ease;box-shadow:0 -10px 40px rgba(0,0,0,.35)}
.sheet.open .sheet-card{transform:none}
.sheet-grab{width:42px;height:5px;border-radius:5px;background:var(--border);margin:2px auto 10px}
.sheet-x{position:absolute;top:8px;right:12px;border:0;background:transparent;color:var(--muted);font-size:24px;cursor:pointer}
.sheet-body{overflow-y:auto;padding-top:4px}.sheet-body .gt{background:transparent}.sheet-body .gt-h b{font-size:17px}.sheet-body .gt-def{font-size:15px}
@media (max-width:900px){.side{display:none}.lesson-wrap{grid-template-columns:minmax(0,1fr)}.gloss-grid{grid-template-columns:minmax(0,1fr)}}

/* Day-to-Day Playbook */
.pb-list{display:grid;gap:16px;grid-template-columns:repeat(auto-fill,minmax(340px,1fr))}
.pb-item h3 a{color:var(--text);text-decoration:none}.pb-item h3 a:hover{color:var(--accent)}
.pb-try{margin-top:12px;padding:10px 12px;border-radius:10px;background:rgba(139,92,246,.12);font-size:14px}
.pb-prod[data-prod="Claude"]{color:#e8a27c}.pb-prod[data-prod="Grok Bot"],.pb-prod[data-prod="Grok Build"],.pb-prod[data-prod="Grok"]{color:#7dd3fc}