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(prefers-color-scheme:dark){:root{--bg:#0e0f1a;--panel:#ffffff0f;--panel-strong:#ffffff1a;--border:#ffffff24;--ink:#f2f2fa;--ink-soft:#a3a5c2;--blob-a:#6d28d9;--blob-b:#0891b2;--blob-c:#be185d}}*{box-sizing:border-box}html,body{height:100%}body{background:var(--bg);color:var(--ink);font-family:var(--sans);margin:0;line-height:1.5;position:relative}a{color:inherit}.blob{filter:blur(90px);opacity:.4;z-index:0;pointer-events:none;border-radius:50%;position:fixed}.blob.a{background:var(--blob-a);width:420px;height:420px;top:-120px;left:-100px}.blob.b{background:var(--blob-b);width:380px;height:380px;top:200px;right:-140px}.blob.c{background:var(--blob-c);width:340px;height:340px;bottom:-100px;left:30%}.wrap{z-index:1;flex-direction:column;gap:32px;max-width:920px;margin:0 auto;padding:48px 24px 96px;display:flex;position:relative}.label{font-family:var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--ink-soft);font-size:11px}.glass{border:1px solid var(--border);background:var(--panel);-webkit-backdrop-filter:blur(24px)saturate(160%);border-radius:28px;padding:clamp(20px,4vw,36px);position:relative;box-shadow:0 8px 32px #14143c1f,inset 0 1px #ffffff80}h1,h2,h3{text-wrap:balance;margin:0}h1{letter-spacing:-.01em;font-size:clamp(24px,4vw,36px);font-weight:700}h2{font-family:var(--mono);letter-spacing:.14em;text-transform:uppercase;color:var(--ink-soft);margin-bottom:18px;font-size:12.5px}p{max-width:68ch;color:var(--ink-soft);margin:8px 0 0}.pill-meta{flex-wrap:wrap;gap:10px;margin-top:16px;display:flex}.pill-meta span{font-family:var(--mono);background:var(--panel-strong);border:1px solid var(--border);color:var(--ink-soft);border-radius:999px;padding:6px 14px;font-size:11.5px}.back-link{font-family:var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--ink-soft);align-items:center;gap:6px;font-size:12px;text-decoration:none;display:inline-flex}.back-link:hover{color:var(--ink)}.map-grid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:24px 8px;display:grid}.track-label{font-family:var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--ink-soft);grid-column:1/-1;margin-top:8px;font-size:10px}.track-label:first-child{margin-top:0}.node-link{text-align:center;flex-direction:column;align-items:center;gap:10px;text-decoration:none;display:flex}.node-dot{width:60px;height:60px;font-family:var(--mono);background:radial-gradient(circle at 32% 26%, #ffffff8c, transparent 46%), linear-gradient(135deg, var(--primary-1), var(--primary-2));color:#fff;border-radius:50%;place-items:center;font-size:13px;font-weight:700;transition:transform .25s cubic-bezier(.2,.8,.2,1);display:grid;position:relative;box-shadow:0 6px 18px #8b5cf666,inset 0 1px 2px #fff6}.node-link:hover .node-dot{transform:translateY(-4px)scale(1.05)}.node-name{color:var(--ink-soft);max-width:100px;font-size:11.5px}.node-count{color:var(--ink-soft);opacity:.8;font-size:10px}.quiz-card{flex-direction:column;gap:10px;display:flex}.quiz-q{color:var(--ink);font-size:16px;font-weight:600}.options{gap:10px;display:grid}.opt{all:unset;border:1px solid var(--border);background:var(--panel-strong);cursor:pointer;color:var(--ink);border-radius:16px;align-items:center;gap:14px;padding:14px 16px;font-size:14.5px;transition:transform .15s;display:flex}.opt:hover{transform:translateY(-1px)}.opt:focus-visible{outline:2px solid var(--primary-2);outline-offset:2px}.opt .k{font-family:var(--mono);width:24px;height:24px;color:var(--ink-soft);background:#7878a024;border-radius:50%;flex:none;place-items:center;font-size:11.5px;font-weight:700;display:grid}.opt.correct-reveal{background:linear-gradient(135deg,#14b8a62e,#38bdf82e);border-color:#0000}.opt.correct-reveal .k{background:linear-gradient(135deg, var(--teal-1), var(--teal-2));color:#fff}.opt.wrong-reveal{background:linear-gradient(135deg,#f59e0b24,#fb718524);border-color:#0000}.opt.wrong-reveal .k{background:linear-gradient(135deg, var(--warm-1), var(--warm-2));color:#fff}.opt[disabled]{cursor:default}.explain{background:var(--panel-strong);border:1px solid var(--border);border-radius:14px;padding:14px 16px;font-size:13.5px}.explain-head{justify-content:space-between;align-items:center;gap:12px;margin-bottom:6px;display:flex}.translate-btn{all:unset;cursor:pointer;font-family:var(--mono);letter-spacing:.08em;text-transform:uppercase;background:linear-gradient(135deg, var(--primary-1), var(--primary-2));color:#fff;border-radius:999px;padding:5px 12px;font-size:10px}.lesson-content h2{font-family:var(--sans);text-transform:none;letter-spacing:0;color:var(--ink);margin:20px 0 8px;font-size:17px;font-weight:700}.lesson-content h2:first-child{margin-top:0}.lesson-content p,.lesson-content li{color:var(--ink-soft);font-size:14.5px}.lesson-content strong{color:var(--ink)}.lesson-content ul{padding-left:20px}.ask-box{gap:10px;margin-top:12px;display:flex}.ask-box input{border:1px solid var(--border);background:var(--panel-strong);color:var(--ink);font-size:14px;font-family:var(--sans);border-radius:999px;flex:1;padding:12px 16px}.ask-box button{all:unset;cursor:pointer;background:linear-gradient(135deg, var(--primary-1), var(--primary-2));color:#fff;border-radius:999px;padding:12px 20px;font-size:13px;font-weight:600}.ask-answer{background:var(--panel-strong);border:1px solid var(--border);white-space:pre-wrap;border-radius:16px;margin-top:14px;padding:16px;font-size:14px}.streak-card{align-items:center;gap:20px;padding:20px clamp(20px,4vw,32px);display:flex}.streak-flame-wrap{flex:none;place-items:center;width:64px;height:64px;display:grid;position:relative}.streak-flame{z-index:1;filter:drop-shadow(0 4px 10px #f59e0b66);animation:2.2s ease-in-out infinite flame-flicker;position:relative}.streak-flame-glow{z-index:0;background:radial-gradient(circle,#f59e0b73,#0000 70%);border-radius:50%;animation:2.2s ease-in-out infinite flame-glow-pulse;position:absolute;inset:-6px}@media (prefers-reduced-motion:reduce){.streak-flame,.streak-flame-glow{animation:none}}@keyframes flame-flicker{0%,to{transform:scale(1)rotate(-1deg)}50%{transform:scale(1.08)rotate(1deg)}}@keyframes flame-glow-pulse{0%,to{opacity:.7;transform:scale(1)}50%{opacity:1;transform:scale(1.15)}}.streak-info{text-align:center;flex:none}.streak-number{font-family:var(--mono);background:linear-gradient(135deg, var(--warm-1), var(--warm-2));color:#0000;-webkit-background-clip:text;background-clip:text;font-size:32px;font-weight:700;line-height:1}.streak-ring-wrap{flex:none;place-items:center;width:64px;height:64px;display:grid;position:relative}.streak-ring-wrap svg{position:absolute;inset:0;transform:rotate(-90deg)}.streak-ring-track{fill:none;stroke:#7878a029;stroke-width:6px}.streak-ring-progress{fill:none;stroke:url(#streakRingGrad);stroke-width:6px;stroke-linecap:round;transition:stroke-dashoffset 1s cubic-bezier(.2,.8,.2,1)}.streak-ring-label{font-family:var(--mono);color:var(--ink);z-index:1;font-size:11px;font-weight:700;position:relative}.streak-today-label{text-align:right;margin-left:auto;font-size:13px}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}