:root{--bg: #0b0f1a;--bg-soft: #111827;--card: #151d2e;--card-hover: #1a2438;--border: #243049;--text: #e6ebf5;--text-dim: #94a3b8;--primary: #facc15;--primary-dark: #eab308;--accent: #38bdf8;--green: #34d399;--red: #f87171;--radius: 14px;--mono: "JetBrains Mono", monospace}:root[data-theme=light]{--bg: #f4f6fb;--bg-soft: #e9edf6;--card: #ffffff;--card-hover: #f4f7fd;--border: #d8e0ee;--text: #17223a;--text-dim: #5b6b85;--primary: #d99e00;--primary-dark: #b88600;--accent: #0284c7}:root[data-theme=light] .navbar{background:#ffffffe0}:root[data-theme=light] .orb{opacity:.1}:root[data-theme=light] .grid-bg{background-image:linear-gradient(rgba(23,34,58,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(23,34,58,.06) 1px,transparent 1px)}:root[data-theme=light] .btn-primary{color:#241d00}:root[data-theme=light] .stats-strip{background:var(--card)}:root[data-theme=light] .footer-big{background:linear-gradient(180deg,var(--bg),#e6ebf5)}:root[data-theme=light] .footer-col a{color:#40506b}:root[data-theme=light] .preview-card,:root[data-theme=light] .testi-card,:root[data-theme=light] .lock-screen,:root[data-theme=light] .cta-box,:root[data-theme=light] .dev-card{background:var(--card)}:root[data-theme=light] .pg-problem-statement,:root[data-theme=light] .pg-req-list li{color:#33415c}:root[data-theme=light] .pgw-brief{background:var(--card)}:root[data-theme=light] .chat-sidebar{background:var(--card)}:root[data-theme=light] .auth-brand{background:linear-gradient(160deg,#e9eefa,var(--bg) 60%)}:root[data-theme=light] .auth-card.fancy{background:linear-gradient(var(--card),var(--card)) padding-box,linear-gradient(150deg,rgba(217,158,0,.55),rgba(2,132,199,.4),transparent 70%) 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var(--border);border-radius:var(--radius);padding:20px;color:var(--text);transition:transform .13s,border-color .13s}.concept-card:hover{transform:translateY(-3px);border-color:var(--accent)}.concept-card-top{display:flex;justify-content:space-between;margin-bottom:10px}.concept-card h3{font-size:1.02rem;margin-bottom:8px}.concept-cat{color:var(--text-dim);font-size:.8rem}.level-badge{font-size:.7rem;font-weight:700;text-transform:uppercase;padding:3px 9px;border-radius:100px;letter-spacing:.4px}.level-badge.basic{background:#34d39926;color:var(--green)}.level-badge.intermediate{background:#38bdf826;color:var(--accent)}.level-badge.advanced{background:#f8717126;color:var(--red)}.done-badge{font-size:.75rem;color:var(--green);font-weight:600}.done-badge.bookmark{color:var(--primary)}.detail-header{margin-bottom:30px}.detail-header h1{margin:10px 0 16px;text-transform:none}.detail-actions{display:flex;gap:10px}.detail-section{margin-bottom:36px}.detail-section h2{font-size:1.2rem;margin-bottom:14px}.explanation{color:var(--text);font-size:1.05rem;max-width:800px}.code-block{background:#0d1322;border:1px solid var(--border);border-radius:var(--radius);padding:22px;font-family:var(--mono);font-size:.88rem;color:#a5d6ff;overflow-x:auto;line-height:1.7}.qa{background:var(--card);border:1px solid var(--border);border-radius:10px;margin-bottom:10px;overflow:hidden}.qa summary{padding:15px 18px;cursor:pointer;font-weight:600;list-style:none;position:relative}.qa summary:after{content:"+";position:absolute;right:18px;color:var(--primary)}.qa[open] summary:after{content:"−"}.qa p{padding:0 18px 16px;color:var(--text-dim)}.questions-page{max-width:880px}.qbank-toolbar{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin:18px 0 16px}.qbank-count{color:var(--text-dim);font-size:.9rem}.qbank-count strong{color:var(--primary)}.qbank-list{display:flex;flex-direction:column;gap:10px}.qbank-item summary{display:flex;align-items:center;gap:10px;padding-right:44px;line-height:1.5}.qbank-item summary .level-badge{margin-left:auto;flex-shrink:0}.qbank-num{font-family:var(--mono);color:var(--primary);font-size:.8rem;flex-shrink:0}.qbank-answer{color:var(--text)!important;line-height:1.7}.qbank-source{font-size:.8rem!important;border-top:1px dashed var(--border);margin:0 18px;padding:10px 0 14px!important}.qbank-source a{color:var(--accent)}.qbank-source a:hover{text-decoration:underline}.auth-page{display:flex;justify-content:center;padding:70px 20px}.auth-card{width:100%;max-width:400px;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:34px;display:flex;flex-direction:column;gap:16px}.auth-card h2{font-size:1.5rem}.auth-sub{color:var(--text-dim);font-size:.92rem;margin-top:-10px}.auth-card label{display:flex;flex-direction:column;gap:6px;font-size:.88rem;color:var(--text-dim)}.auth-card input{padding:12px 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span{color:var(--text-dim);font-size:.85rem}.quiz-question{margin-bottom:26px}.quiz-q-text{font-weight:600;margin-bottom:12px;font-size:1.02rem}.quiz-options{display:grid;gap:8px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}.quiz-option{padding:13px 16px;border-radius:10px;text-align:left;background:var(--card);border:1px solid var(--border);color:var(--text);font-size:.93rem;font-family:var(--mono)}.quiz-option:hover{border-color:var(--accent)}.quiz-option.selected{border-color:var(--primary);background:#facc1514}.confetti{position:fixed;top:0;right:0;bottom:0;left:0;pointer-events:none;z-index:999;overflow:hidden}.confetti-piece{position:absolute;top:-20px;border-radius:2px;animation:confettiFall linear forwards}.confetti-piece.round{border-radius:50%}@keyframes confettiFall{0%{transform:translateY(-20px) rotate(0);opacity:1}80%{opacity:1}to{transform:translateY(105vh) rotate(720deg);opacity:0}}.result-hero{text-align:center;padding:30px 24px 34px;margin-bottom:36px;background:linear-gradient(165deg,var(--card),#10182b);border:1px solid transparent;background:linear-gradient(165deg,var(--card),#10182b) padding-box,linear-gradient(140deg,#facc1580,#38bdf859) border-box;border-radius:22px;display:flex;flex-direction:column;align-items:center;gap:12px;animation:fadeUp .5s ease both}:root[data-theme=light] .result-hero{background:linear-gradient(165deg,var(--card),var(--card)) padding-box,linear-gradient(140deg,#d99e0080,#0284c759) border-box}.result-emoji{font-size:3rem;animation:splashFloat 2.4s ease-in-out infinite}.result-ring{width:130px;height:130px;border-radius:50%;background:conic-gradient(var(--primary) calc(var(--pct) * 1%),var(--bg-soft) 0);display:flex;align-items:center;justify-content:center;animation:fadeUp .7s ease both}.result-ring:before{content:"";position:absolute;width:104px;height:104px;border-radius:50%;background:var(--card)}.result-pct{position:relative;font-size:1.8rem;font-weight:700;color:var(--primary)}.result-hero h1{font-size:1.8rem;margin:4px 0 0}.result-breakdown{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;margin:8px 0 4px}.rb-chip{padding:6px 14px;border-radius:100px;font-size:.85rem;font-weight:600;background:var(--bg-soft);border:1px solid var(--border);color:var(--text-dim)}.rb-chip.ok{color:var(--green);background:#34d3991a;border-color:#34d3994d}.rb-chip.bad{color:var(--red);background:#f871711a;border-color:#f871714d}.rb-chip.skip{color:var(--primary);background:#facc151a;border-color:#facc154d}.result-review-title{font-size:1.2rem;margin-bottom:16px}.review-correct{color:var(--green)}.review-card{background:var(--card);border:1px solid var(--border);border-left:4px solid var(--green);border-radius:10px;padding:18px;margin-bottom:12px}.review-card.bad{border-left-color:var(--red)}.review-q{font-weight:600;margin-bottom:6px}.review-exp{color:var(--text-dim);font-size:.88rem;margin-top:6px}.quiz-nav{display:flex;gap:12px;margin-top:20px}.dash-grid{display:grid;gap:16px;margin-bottom:40px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}.dash-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;display:flex;flex-direction:column;gap:4px}.dash-num{font-size:2rem;font-weight:700;color:var(--primary)}.dash-label{color:var(--text-dim);font-size:.88rem}.progress-bar{height:8px;border-radius:100px;background:var(--bg-soft);margin-top:12px;overflow:hidden}.progress-fill{height:100%;border-radius:100px;background:linear-gradient(90deg,var(--primary),var(--accent));transition:width .4s}.dash-catprogress{margin-bottom:40px}.dash-catprogress 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a.active{color:var(--text);background:#38bdf81a}.nav-mobile-group{font-size:.66rem;font-weight:700;letter-spacing:1.2px;text-transform:uppercase;color:var(--text-dim);margin:10px 8px 2px}.nav-search-btn{display:flex;align-items:center;gap:6px;background:transparent;border:1px solid var(--border);border-radius:8px;color:var(--text-dim);font-size:.82rem;padding:6px 10px;cursor:pointer;font-family:inherit;transition:border-color .13s,color .13s}.nav-search-btn:hover{border-color:var(--accent);color:var(--text)}.nav-search-btn kbd{font-family:var(--mono);font-size:.62rem;color:var(--text-dim);border:1px solid var(--border);border-radius:4px;padding:1px 5px}.nav-burger{display:none;background:transparent;border:1px solid var(--border);border-radius:8px;color:var(--text);font-size:1.1rem;padding:4px 11px;cursor:pointer;line-height:1.4}.nav-mobile{display:none}@media (max-width: 920px){.nav-links{display:none}.nav-burger{display:block}.nav-user,.nav-logout,.nav-login,.nav-search-btn kbd{display:none}.navbar{padding:12px 16px;position:relative;flex-wrap:wrap}.hero{padding-top:60px}.nav-mobile{display:flex;flex-direction:column;gap:4px;position:absolute;top:100%;left:0;right:0;z-index:60;background:var(--bg, #0b1020);border-bottom:1px solid var(--border);padding:10px 16px 16px;box-shadow:0 18px 30px #00000059;animation:fadeUp .18s ease both}:root[data-theme=light] .nav-mobile{background:#fff}.nav-mobile a{color:var(--text-dim);font-weight:500;padding:10px 8px;border-radius:8px}.nav-mobile a.active{color:var(--text);background:#38bdf814}.nav-mobile a:hover{color:var(--text)}.nav-mobile .btn{margin-top:8px;text-align:center}}@media (max-width: 480px){.nav-register{display:none}}