@import"https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700;800&family=Inter:ital,wght@0,400;0,500;0,600;1,400&family=JetBrains+Mono:wght@400;500;600;700&display=swap";*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #edf0fa;--surface: #ffffff;--surface-glass: rgba(255, 255, 255, .95);--elevated: #e2e6f5;--hover-bg: rgba(99, 102, 241, .07);--border: rgba(99, 102, 241, .2);--border-md: rgba(99, 102, 241, .32);--border-bright: rgba(99, 102, 241, .58);--text: #07051a;--text-2: #1a1848;--text-3: #52508e;--shadow-sm: 0 1px 4px rgba(99,102,241,.08), 0 0 1px rgba(99,102,241,.05);--shadow-md: 0 4px 20px rgba(99,102,241,.13), 0 1px 4px rgba(99,102,241,.07);--shadow-lg: 0 12px 50px rgba(99,102,241,.18), 0 2px 10px rgba(99,102,241,.09);--shadow-glow: 0 0 0 1px rgba(99,102,241,.28), 0 6px 28px rgba(99,102,241,.22);--accent: #6366f1;--accent-2: #8b5cf6;--cyan: #22d3ee;--green: #22c55e;--accent-light: rgba(99, 102, 241, .09);--grad-brand: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);--grad-soft: linear-gradient(135deg, rgba(99,102,241,.1) 0%, rgba(139,92,246,.07) 100%);--logo-grad: linear-gradient(135deg, #6366f1 0%, #8b5cf6 40%, #22d3ee 70%, #6366f1 100%);--grid-dot: rgba(99, 102, 241, .11);--aurora-opacity: .28}[data-theme=dark]{--bg: #04061a;--surface: #0a0e24;--surface-glass: rgba(10, 14, 36, .9);--elevated: #111536;--hover-bg: rgba(99, 102, 241, .12);--border: rgba(99, 102, 241, .2);--border-md: rgba(99, 102, 241, .32);--border-bright: rgba(99, 102, 241, .6);--text: #f0efff;--text-2: #b0aee8;--text-3: #7a78b8;--shadow-sm: 0 1px 6px rgba(0,0,0,.35), 0 0 1px rgba(0,0,0,.2);--shadow-md: 0 4px 22px rgba(0,0,0,.45), 0 1px 6px rgba(0,0,0,.25);--shadow-lg: 0 14px 55px rgba(0,0,0,.6), 0 2px 12px rgba(0,0,0,.35);--shadow-glow: 0 0 0 1px rgba(99,102,241,.35), 0 6px 28px rgba(99,102,241,.18);--accent: #818cf8;--accent-2: #a78bfa;--accent-light: rgba(99, 102, 241, .13);--grad-brand: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);--grad-soft: linear-gradient(135deg, rgba(99,102,241,.16) 0%, rgba(139,92,246,.1) 100%);--logo-grad: linear-gradient(135deg, #818cf8 0%, #a78bfa 40%, #22d3ee 70%, #818cf8 100%);--grid-dot: rgba(99, 102, 241, .18);--aurora-opacity: .55}html{scroll-behavior:smooth}body{background:var(--bg);color:var(--text);font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;min-height:100vh;min-height:100svh;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;transition:background-color .3s ease,color .3s ease}button{cursor:pointer;border:none;background:none;color:inherit;font-family:inherit}.bg-canvas{position:fixed;top:0;right:0;bottom:0;left:0;pointer-events:none;z-index:-1;overflow:hidden;contain:layout style paint}.bg-aurora{position:absolute;top:-30%;right:-30%;bottom:-30%;left:-30%;opacity:var(--aurora-opacity);background:radial-gradient(ellipse 45% 45% at 20% 20%,#6366f1 0%,transparent 65%),radial-gradient(ellipse 38% 48% at 80% 78%,#8b5cf6 0%,transparent 62%),radial-gradient(ellipse 32% 32% at 58% 48%,#22d3ee 0%,transparent 58%),radial-gradient(ellipse 28% 28% at 35% 75%,#a78bfa 0%,transparent 55%);filter:blur(18px);animation:auroraDrift 22s ease-in-out infinite;will-change:transform}@keyframes auroraDrift{0%,to{transform:translate(0) rotate(0) scale(1)}20%{transform:translate(2%,3%) rotate(1.5deg) scale(1.04)}40%{transform:translate(-3%,2%) rotate(-1deg) scale(.97)}60%{transform:translate(3%,-2%) rotate(2deg) scale(1.06)}80%{transform:translate(-1%,-3%) rotate(-.5deg) scale(1.02)}}.bg-grid{position:absolute;top:0;right:0;bottom:0;left:0;background-image:radial-gradient(var(--grid-dot) 1px,transparent 1px);background-size:26px 26px;mask-image:radial-gradient(ellipse 80% 80% at 50% 50%,black 40%,transparent 100%);-webkit-mask-image:radial-gradient(ellipse 80% 80% at 50% 50%,black 40%,transparent 100%)}.app-root{position:relative;z-index:1}.theme-toggle{position:fixed;top:max(16px,env(safe-area-inset-top));right:max(16px,env(safe-area-inset-right));z-index:200;width:44px;height:44px;border-radius:50%;background:var(--surface-glass);border:1px solid var(--border-md);display:flex;align-items:center;justify-content:center;color:var(--text-2);box-shadow:var(--shadow-md);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);transition:all .22s cubic-bezier(.34,1.56,.64,1)}.theme-toggle:hover{color:var(--accent);border-color:var(--border-bright);box-shadow:var(--shadow-glow);transform:scale(1.1) rotate(15deg)}.back-btn{display:inline-flex;align-items:center;gap:5px;padding:8px 16px;background:var(--surface-glass);border:1px solid var(--border);border-radius:24px;font-size:.82rem;font-weight:600;color:var(--text-2);box-shadow:var(--shadow-sm);backdrop-filter:blur(5px);-webkit-backdrop-filter:blur(5px);transition:all .2s ease;font-family:Space Grotesk,sans-serif}.back-btn:hover{color:var(--accent);border-color:var(--border-bright);background:var(--accent-light);transform:translate(-2px);box-shadow:var(--shadow-glow)}.home{padding:44px 16px 72px;max-width:1060px;margin:0 auto}.home-header{text-align:center;margin-bottom:52px;padding-top:16px}.logo-row{display:inline-flex;align-items:center;gap:14px;margin-bottom:16px}.logo-icon-wrap{width:50px;height:50px;border-radius:15px;background:var(--grad-brand);display:flex;align-items:center;justify-content:center;flex-shrink:0;animation:iconPulse 3.5s ease-in-out infinite}.logo-icon-wrap svg{color:#fff}@keyframes iconPulse{0%,to{box-shadow:0 4px 20px #6366f173,0 0 #6366f133}50%{box-shadow:0 6px 30px #6366f1a6,0 0 0 6px #6366f114}}.logo-title{font-family:Space Grotesk,sans-serif;font-size:clamp(1.9rem,6vw,2.8rem);font-weight:800;letter-spacing:-.04em;background:var(--logo-grad);background-size:300% 100%;-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;animation:gradientFlow 6s linear infinite}@keyframes gradientFlow{0%{background-position:0% 50%}to{background-position:300% 50%}}.home-sub{color:var(--text-2);font-size:1rem;font-weight:400;margin-bottom:24px;line-height:1.6}.module-toggle{display:inline-flex;align-items:center;gap:4px;background:var(--elevated);border:1px solid var(--border-md);border-radius:28px;padding:4px;margin-bottom:20px;box-shadow:var(--shadow-sm)}.module-btn{display:inline-flex;align-items:center;gap:7px;padding:9px 20px;border-radius:22px;font-family:Space Grotesk,sans-serif;font-size:.84rem;font-weight:700;letter-spacing:.01em;color:var(--text-3);transition:all .22s cubic-bezier(.34,1.56,.64,1);position:relative}.module-btn:hover:not(.active){color:var(--text-2);background:var(--hover-bg)}.module-btn.active{background:var(--grad-brand);color:#fff;box-shadow:0 4px 18px #6366f161,0 0 0 1px #6366f133}.home-stats-row{display:inline-flex;align-items:center;gap:8px;flex-wrap:wrap;justify-content:center}.stat-badge{display:inline-flex;align-items:center;gap:8px;padding:7px 16px;background:var(--surface-glass);border:1px solid var(--border-md);border-radius:24px;font-size:.81rem;font-family:JetBrains Mono,monospace;color:var(--text-2);box-shadow:var(--shadow-sm);backdrop-filter:blur(5px);-webkit-backdrop-filter:blur(5px)}.stat-badge strong{color:var(--accent);font-weight:700}.stat-dot{width:6px;height:6px;border-radius:50%;background:var(--green);box-shadow:0 0 6px #22c55eb3;animation:blinkDot 2s ease-in-out infinite;flex-shrink:0}@keyframes blinkDot{0%,to{opacity:1;transform:scale(1)}50%{opacity:.5;transform:scale(.75)}}.section-label{display:flex;align-items:center;gap:10px;font-family:Space Grotesk,sans-serif;font-size:.72rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--text-3);margin-bottom:14px;padding-left:2px}.section-label:after{content:"";flex:1;height:1px;background:linear-gradient(90deg,var(--border-md),transparent)}.topics-grid{display:grid;grid-template-columns:1fr;gap:10px}.topic-card{display:flex;align-items:center;gap:16px;background:var(--surface-glass);border:1px solid var(--border);border-radius:16px;padding:18px 20px;width:100%;text-align:left;box-shadow:var(--shadow-sm);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);transition:border-color .25s ease,box-shadow .25s ease,transform .25s cubic-bezier(.34,1.56,.64,1),background .25s;position:relative;overflow:hidden;animation:cardEntrance .4s ease both}@keyframes cardEntrance{0%{opacity:0;transform:translateY(14px)}to{opacity:1;transform:translateY(0)}}.topics-grid .topic-card:nth-child(1){animation-delay:0ms}.topics-grid .topic-card:nth-child(2){animation-delay:35ms}.topics-grid .topic-card:nth-child(3){animation-delay:70ms}.topics-grid .topic-card:nth-child(4){animation-delay:105ms}.topics-grid .topic-card:nth-child(5){animation-delay:.14s}.topics-grid .topic-card:nth-child(6){animation-delay:175ms}.topics-grid .topic-card:nth-child(7){animation-delay:.21s}.topics-grid .topic-card:nth-child(8){animation-delay:245ms}.topics-grid .topic-card:nth-child(9){animation-delay:.28s}.topics-grid .topic-card:nth-child(10){animation-delay:315ms}.topics-grid .topic-card:nth-child(11){animation-delay:.35s}.topics-grid .topic-card:nth-child(12){animation-delay:385ms}.topic-card:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:var(--grad-soft);opacity:0;transition:opacity .25s ease;pointer-events:none}.topic-card:after{content:"";position:absolute;top:0;left:0;width:55%;height:100%;background:linear-gradient(90deg,transparent 0%,rgba(255,255,255,.07) 50%,transparent 100%);transform:skew(-18deg) translate(-200%);transition:transform .7s ease;pointer-events:none}.topic-card:hover{border-color:color-mix(in srgb,var(--c, var(--accent)) 55%,transparent);box-shadow:0 0 0 1px color-mix(in srgb,var(--c, var(--accent)) 40%,transparent),0 8px 30px color-mix(in srgb,var(--c, var(--accent)) 22%,transparent),0 2px 8px #00000014;transform:translateY(-4px) scale(1.012);background:color-mix(in srgb,var(--c, var(--accent)) 4%,var(--surface-glass))}.topic-card:hover:before{opacity:1}.topic-card:hover:after{transform:skew(-18deg) translate(340%)}.topic-card:active{transform:translateY(-2px) scale(1.006)}.tc-icon{width:44px;height:44px;border-radius:12px;background:color-mix(in srgb,var(--c, var(--accent)) 14%,transparent);display:flex;align-items:center;justify-content:center;flex-shrink:0;color:var(--c, var(--accent));position:relative;z-index:1;transition:transform .28s cubic-bezier(.34,1.56,.64,1),box-shadow .28s;border:1px solid color-mix(in srgb,var(--c, var(--accent)) 20%,transparent)}.topic-card:hover .tc-icon{transform:scale(1.14) rotate(-7deg);box-shadow:0 4px 16px color-mix(in srgb,var(--c, var(--accent)) 40%,transparent)}.tc-body{flex:1;min-width:0;position:relative;z-index:1}.tc-name{display:block;font-family:Space Grotesk,sans-serif;font-weight:600;font-size:.93rem;letter-spacing:-.01em;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.tc-count{display:inline-flex;align-items:center;gap:5px;font-family:JetBrains Mono,monospace;font-size:.68rem;color:var(--text-3);margin-top:3px}.tc-count:before{content:"";display:inline-block;width:5px;height:5px;border-radius:50%;background:var(--c, var(--accent));opacity:.45;flex-shrink:0}.tc-arrow{color:var(--text-3);font-size:1.25rem;line-height:1;transition:transform .2s ease,color .2s ease;position:relative;z-index:1}.topic-card:hover .tc-arrow{transform:translate(6px);color:var(--c, var(--accent))}.tc-badge{display:inline-flex;align-items:center;gap:4px;font-family:JetBrains Mono,monospace;font-size:.68rem;font-weight:700;padding:4px 9px;border-radius:8px;flex-shrink:0;position:relative;z-index:1;transition:transform .2s ease}.topic-card:hover .tc-badge{transform:scale(1.08)}.mode-page{max-width:640px;margin:0 auto;padding:28px 16px 72px}.mode-topic-hero{text-align:center;margin:44px 0 48px}.mode-icon-circle{width:86px;height:86px;border-radius:24px;display:flex;align-items:center;justify-content:center;margin:0 auto 22px;border:1px solid rgba(255,255,255,.15);position:relative}.mode-topic-name{font-family:Space Grotesk,sans-serif;font-size:1.7rem;font-weight:800;letter-spacing:-.038em;margin-bottom:8px}.mode-topic-meta{font-family:JetBrains Mono,monospace;font-size:.74rem;color:var(--text-3)}.mode-cards{display:grid;grid-template-columns:1fr;gap:14px}.mode-card{display:flex;flex-direction:column;align-items:flex-start;gap:12px;background:var(--surface-glass);border:1px solid var(--border);border-radius:20px;padding:28px 24px;text-align:left;box-shadow:var(--shadow-sm);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);transition:all .26s cubic-bezier(.34,1.56,.64,1);position:relative;overflow:hidden}.mode-card:after{content:"";position:absolute;bottom:-55px;right:-55px;width:150px;height:150px;border-radius:50%;background:var(--grad-soft);opacity:0;transition:opacity .35s ease,transform .35s ease;transform:scale(.65);pointer-events:none}.mode-card:hover:after{opacity:1;transform:scale(1.2)}.mode-card:hover{border-color:var(--border-bright);box-shadow:0 0 0 1px #6366f14d,0 0 40px #6366f12e,var(--shadow-lg);transform:translateY(-6px) scale(1.01)}.mode-card-icon{width:54px;height:54px;border-radius:14px;display:flex;align-items:center;justify-content:center;position:relative;z-index:1;flex-shrink:0;transition:transform .25s cubic-bezier(.34,1.56,.64,1),box-shadow .25s;border:1px solid rgba(255,255,255,.1)}.mode-card:hover .mode-card-icon{transform:scale(1.1) rotate(-5deg);box-shadow:0 6px 20px #6366f14d}.mode-card h3{font-family:Space Grotesk,sans-serif;font-weight:700;font-size:1.15rem;letter-spacing:-.025em;position:relative;z-index:1}.mode-card p{font-size:.88rem;color:var(--text-2);line-height:1.65;position:relative;z-index:1}.mode-card-cta{font-size:.85rem;font-weight:700;font-family:Space Grotesk,sans-serif;position:relative;z-index:1;display:inline-flex;align-items:center;gap:4px}.quiz-page{max-width:700px;margin:0 auto;padding:16px 16px 72px}.quiz-topbar{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px;margin-bottom:22px}.quiz-topic-pill{font-family:Space Grotesk,sans-serif;font-size:.74rem;font-weight:600;padding:5px 14px;border-radius:24px;border:1.5px solid currentColor;opacity:.9;letter-spacing:.01em}.quiz-score-pill{font-family:JetBrains Mono,monospace;font-size:.8rem;color:var(--text-2);background:var(--surface-glass);border:1px solid var(--border-md);padding:5px 14px;border-radius:24px;box-shadow:var(--shadow-sm);backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px)}.quiz-progress-wrap{margin-bottom:28px}.quiz-progress-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:9px}.quiz-qnum{font-family:JetBrains Mono,monospace;font-size:.71rem;color:var(--text-3)}.quiz-pct{font-family:JetBrains Mono,monospace;font-size:.71rem;color:var(--accent);font-weight:600}.quiz-progress-track{height:6px;background:var(--elevated);border-radius:3px;overflow:hidden;border:1px solid var(--border);box-shadow:inset 0 1px 3px #00000014,0 1px 8px #6366f11f}.quiz-progress-fill{height:100%;border-radius:3px;transition:width .5s cubic-bezier(.4,0,.2,1);position:relative}.quiz-card{background:var(--surface-glass);border:1px solid var(--border);border-radius:20px;padding:24px 20px;box-shadow:var(--shadow-md);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}.quiz-question{font-size:1.08rem;line-height:1.78;margin-bottom:28px;font-weight:500;font-family:Inter,sans-serif;color:var(--text)}.quiz-options{display:flex;flex-direction:column;gap:10px}.opt-btn{display:flex;align-items:center;gap:14px;background:var(--elevated);border:1.5px solid var(--border);border-radius:12px;padding:14px 18px;text-align:left;font-size:.91rem;font-family:Inter,sans-serif;font-weight:500;transition:all .18s ease;width:100%;position:relative;overflow:hidden}.opt-btn:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:var(--grad-soft);opacity:0;transition:opacity .18s ease}.opt-btn:not(.revealed):hover{border-color:var(--border-bright);background:var(--hover-bg);transform:translate(4px);box-shadow:0 0 0 1px #6366f133,var(--shadow-sm)}.opt-btn:not(.revealed):hover:before{opacity:1}.opt-key{width:30px;height:30px;border-radius:8px;background:var(--surface);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;font-family:JetBrains Mono,monospace;font-size:.71rem;font-weight:700;flex-shrink:0;transition:all .18s ease;position:relative;z-index:1}.opt-text{flex:1;min-width:0;line-height:1.5;position:relative;z-index:1}.opt-icon{flex-shrink:0;position:relative;z-index:1}.opt-btn.correct{border-color:#10b981;background:#10b98112}.opt-btn.correct .opt-key{background:#10b981;border-color:#10b981;color:#fff;box-shadow:0 0 10px #10b98180}.opt-btn.wrong{border-color:#ef4444;background:#ef44440f}.opt-btn.wrong .opt-key{background:#ef4444;border-color:#ef4444;color:#fff;box-shadow:0 0 10px #ef444466}.opt-btn.dim{opacity:.28}.opt-btn.revealed{cursor:default}.opt-btn.revealed:before{display:none}.quiz-revealed-actions{display:flex;align-items:stretch;gap:10px;margin-top:20px;animation:slideUp .25s ease}.quiz-revealed-actions .quiz-next-btn{flex:1;margin-top:0;animation:none}.quiz-nail-btn{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;flex-shrink:0;width:66px;padding:10px 6px;border-radius:12px;border:1.5px solid rgba(245,158,11,.35);background:#f59e0b12;color:#b45309;font-family:Space Grotesk,sans-serif;font-size:.62rem;font-weight:700;letter-spacing:.03em;cursor:pointer;transition:all .2s ease}[data-theme=dark] .quiz-nail-btn{color:#fbbf24;border-color:#fbbf244d;background:#fbbf2414}.quiz-nail-btn:hover{border-color:#f59e0b;background:#f59e0b24;transform:translateY(-2px)}.quiz-nail-btn.nailed{border-color:#f59e0b;background:#f59e0b2e;color:#d97706;box-shadow:0 0 12px #f59e0b4d,inset 0 0 8px #f59e0b1a}[data-theme=dark] .quiz-nail-btn.nailed{color:#fbbf24;box-shadow:0 0 14px #fbbf2459,inset 0 0 8px #fbbf241f}.quiz-nail-btn svg{transition:transform .2s ease}.quiz-nail-btn:hover svg{transform:scale(1.2) rotate(-8deg)}.quiz-nail-btn.nailed svg{filter:drop-shadow(0 0 4px rgba(245,158,11,.7))}.quiz-next-btn{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;margin-top:20px;padding:15px;border-radius:12px;font-family:Space Grotesk,sans-serif;font-weight:700;font-size:.95rem;color:#fff;background:var(--grad-brand);box-shadow:0 4px 24px #6366f16b,0 0 0 1px #6366f140;transition:all .22s ease;animation:slideUp .25s ease;position:relative;overflow:hidden}.quiz-next-btn:after{content:"";position:absolute;top:-50%;left:-25%;width:42%;height:200%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.22),transparent);transform:skew(-22deg) translate(-200%);animation:btnShine 3.2s ease-in-out .5s infinite}@keyframes btnShine{0%,to{transform:skew(-22deg) translate(-200%)}50%{transform:skew(-22deg) translate(650%)}}.quiz-next-btn:hover{transform:translateY(-3px);box-shadow:0 8px 36px #6366f18c,0 0 0 1px #6366f159}.score-page{min-height:100vh;min-height:100svh;display:flex;align-items:center;justify-content:center;padding:24px}.score-card{background:var(--surface-glass);border:1px solid var(--border-md);border-radius:24px;padding:42px 28px;text-align:center;max-width:440px;width:100%;box-shadow:var(--shadow-lg),0 0 0 1px #6366f126,0 0 60px #6366f11a;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);animation:popIn .48s cubic-bezier(.34,1.56,.64,1);position:relative;overflow:hidden}.score-card:before{content:"";position:absolute;top:-80px;left:50%;transform:translate(-50%);width:240px;height:240px;border-radius:50%;background:var(--grad-brand);opacity:.07;filter:blur(26px);pointer-events:none}.score-trophy{margin-bottom:20px;animation:bob 2.8s ease-in-out infinite;position:relative;z-index:1;filter:drop-shadow(0 4px 12px rgba(99,102,241,.4))}.score-title{font-family:Space Grotesk,sans-serif;font-size:1.55rem;font-weight:800;letter-spacing:-.035em;margin-bottom:26px;position:relative;z-index:1}.score-ring-wrap{position:relative;width:140px;height:140px;margin:0 auto 22px;z-index:1}.score-ring-svg{transform:rotate(-90deg)}.score-ring-bg{fill:none;stroke:var(--elevated);stroke-width:10}.score-ring-fill{fill:none;stroke-width:10;stroke-linecap:round;transition:stroke-dashoffset 1.2s cubic-bezier(.4,0,.2,1)}.score-ring-text{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:1px}.score-fraction{font-family:Space Grotesk,sans-serif;font-size:2.1rem;font-weight:800;line-height:1;letter-spacing:-.04em}.score-total{font-size:1.4rem;color:var(--text-2);font-weight:600}.score-pct{font-family:JetBrains Mono,monospace;font-size:.78rem;color:var(--text-3)}.score-msg{color:var(--text-2);font-size:.96rem;margin-bottom:32px;font-weight:500;line-height:1.6;position:relative;z-index:1}.score-actions{display:flex;gap:12px;position:relative;z-index:1}.score-retry{flex:1;padding:13px;background:var(--elevated);border:1.5px solid var(--border-md);border-radius:12px;font-family:Space Grotesk,sans-serif;font-weight:700;font-size:.9rem;color:var(--text);transition:all .18s ease}.score-retry:hover{background:var(--hover-bg);border-color:var(--border-bright);transform:translateY(-2px);box-shadow:0 0 0 1px #6366f133,var(--shadow-sm)}.score-home{flex:1;display:flex;align-items:center;justify-content:center;gap:7px;padding:13px;border-radius:12px;font-family:Space Grotesk,sans-serif;font-weight:700;font-size:.9rem;color:#fff;transition:all .18s ease;position:relative;overflow:hidden}.score-home:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:linear-gradient(135deg,rgba(255,255,255,.12) 0%,transparent 60%);pointer-events:none}.score-home:hover{transform:translateY(-2px);filter:brightness(1.1)}.study-page{max-width:760px;margin:0 auto;padding:16px 16px 72px}.study-topbar{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:28px}.study-title{font-family:Space Grotesk,sans-serif;font-weight:700;font-size:1rem;letter-spacing:-.02em;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.study-home-btn{width:40px;height:40px;border-radius:50%;background:var(--surface-glass);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;color:var(--text-2);box-shadow:var(--shadow-sm);backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);transition:all .22s cubic-bezier(.34,1.56,.64,1)}.study-home-btn:hover{color:var(--accent);border-color:var(--border-bright);background:var(--accent-light);transform:scale(1.1);box-shadow:var(--shadow-glow)}.study-list{display:flex;flex-direction:column;gap:12px}.study-card{background:var(--surface-glass);border:1px solid var(--border);border-left:3px solid var(--c, var(--accent));border-radius:16px;padding:20px 22px 18px;box-shadow:var(--shadow-sm);backdrop-filter:blur(5px);-webkit-backdrop-filter:blur(5px);transition:box-shadow .22s ease,transform .22s ease,border-color .22s}.study-card:hover{box-shadow:0 0 0 1px color-mix(in srgb,var(--c, var(--accent)) 35%,transparent),0 6px 24px color-mix(in srgb,var(--c, var(--accent)) 14%,transparent),var(--shadow-sm);transform:translate(4px)}.study-card-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.study-qnum{font-family:JetBrains Mono,monospace;font-size:.72rem;font-weight:600}.study-toggle{display:inline-flex;align-items:center;gap:5px;font-size:.75rem;font-weight:600;padding:5px 12px;border-radius:24px;background:var(--elevated);border:1px solid var(--border);font-family:Space Grotesk,sans-serif;transition:all .18s ease}.study-toggle:hover{border-color:var(--border-bright);background:var(--hover-bg);box-shadow:0 0 0 1px #6366f126}.study-question{font-size:.96rem;line-height:1.72;margin-bottom:14px;color:var(--text);font-weight:500;font-family:Inter,sans-serif}.study-options{display:flex;flex-direction:column;gap:7px}.study-opt{display:flex;align-items:center;gap:10px;padding:10px 14px;border-radius:10px;background:var(--elevated);border:1px solid var(--border);font-size:.87rem;font-family:Inter,sans-serif;font-weight:500;transition:all .18s ease}.study-opt.correct{border-color:var(--c, var(--accent));background:color-mix(in srgb,var(--c, var(--accent)) 9%,transparent);color:var(--text)}.study-opt-key{width:24px;height:24px;border-radius:6px;background:var(--surface);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;font-family:JetBrains Mono,monospace;font-size:.67rem;font-weight:700;flex-shrink:0}.study-opt.correct .study-opt-key{background:var(--c, var(--accent));border-color:var(--c, var(--accent));color:#fff;box-shadow:0 0 8px color-mix(in srgb,var(--c, var(--accent)) 50%,transparent)}.study-opt-text{flex:1;min-width:0;line-height:1.5}.explanation-box{margin-top:18px;background:color-mix(in srgb,var(--c, var(--accent)) 9%,var(--elevated));border:1px solid color-mix(in srgb,var(--c, var(--accent)) 28%,transparent);border-radius:12px;padding:16px 18px}.explanation-header{display:flex;align-items:center;gap:7px;margin-bottom:9px}.explanation-label{font-family:Space Grotesk,sans-serif;font-size:.8rem;font-weight:700;letter-spacing:.02em;flex:1}.answer-badge{font-family:JetBrains Mono,monospace;font-size:.71rem;font-weight:700;padding:3px 10px;border-radius:20px}.answer-badge.correct{background:#10b98121;color:#10b981;border:1px solid rgba(16,185,129,.28)}.answer-badge.wrong{background:#ef44441a;color:#ef4444;border:1px solid rgba(239,68,68,.24)}.explanation-text{font-family:Inter,sans-serif;font-size:.91rem;line-height:1.78;color:var(--text)}@keyframes slideUp{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes popIn{0%{opacity:0;transform:scale(.84) translateY(16px)}to{opacity:1;transform:scale(1) translateY(0)}}@keyframes bob{0%,to{transform:translateY(0) rotate(0)}25%{transform:translateY(-8px) rotate(-4deg)}75%{transform:translateY(-4px) rotate(3deg)}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}.anim-fade{animation:fadeIn .3s ease}.anim-slide{animation:slideUp .28s ease}:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}@media (prefers-reduced-motion: reduce){*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}.bg-aurora,.logo-title,.logo-icon-wrap{animation:none!important}}@media (min-width: 600px){.home{padding:64px 24px 90px}.home-header{margin-bottom:60px}.topics-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:12px}.mode-page{padding:48px 24px 90px}.mode-cards{grid-template-columns:1fr 1fr}.quiz-page{padding:28px 24px 90px}.quiz-card{padding:36px 32px}.score-card{padding:54px 46px}.study-page{padding:28px 24px 90px}.theme-toggle{top:max(20px,env(safe-area-inset-top));right:max(24px,env(safe-area-inset-right))}}@media (min-width: 960px){.topics-grid{grid-template-columns:repeat(auto-fill,minmax(285px,1fr));gap:13px}}.written-count-badge{display:inline-flex;align-items:center;justify-content:center;font-family:JetBrains Mono,monospace;font-size:.65rem;font-weight:700;width:20px;height:20px;border-radius:6px;margin-left:8px;vertical-align:middle}.written-page{max-width:780px;margin:0 auto;padding:16px 16px 80px}.written-topbar{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:24px;flex-wrap:wrap}.written-topic-pill{display:inline-flex;align-items:center;gap:6px;font-family:Space Grotesk,sans-serif;font-size:.78rem;font-weight:600;padding:6px 14px;border-radius:24px;border:1.5px solid;background:var(--surface-glass);backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px);letter-spacing:.01em}.written-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:80px 16px;color:var(--text-3);font-size:.95rem;text-align:center}.written-list{display:flex;flex-direction:column;gap:12px}.written-card{background:var(--surface-glass);border:1px solid var(--border);border-left:3px solid var(--c, var(--accent));border-radius:16px;box-shadow:var(--shadow-sm);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);overflow:hidden;transition:box-shadow .22s ease,border-color .22s ease}.written-card.open{box-shadow:0 0 0 1px color-mix(in srgb,var(--c, var(--accent)) 30%,transparent),0 8px 32px color-mix(in srgb,var(--c, var(--accent)) 12%,transparent),var(--shadow-md);border-color:color-mix(in srgb,var(--c, var(--accent)) 40%,var(--border))}.written-card-header{display:flex;align-items:flex-start;gap:12px;width:100%;text-align:left;padding:18px 20px;transition:background .18s ease}.written-card-header:hover{background:var(--hover-bg)}.written-qnum{font-family:JetBrains Mono,monospace;font-size:.75rem;font-weight:700;flex-shrink:0;padding-top:2px;letter-spacing:.02em}.written-qtext{flex:1;font-size:.94rem;font-weight:500;line-height:1.65;color:var(--text);font-family:Inter,sans-serif}.written-chevron{flex-shrink:0;color:var(--text-3);padding-top:2px;transition:color .18s}.written-card.open .written-chevron{color:var(--c, var(--accent))}.written-card-body{padding:16px 20px 24px;display:flex;flex-direction:column;gap:16px}.written-summary{border:1px solid;border-radius:10px;padding:12px 16px}.written-summary-label{display:block;font-family:Space Grotesk,sans-serif;font-size:.67rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;margin-bottom:6px}.written-summary p{font-size:.91rem;line-height:1.7;color:var(--text);font-family:Inter,sans-serif}.written-points{list-style:none;display:flex;flex-direction:column;gap:9px}.written-point{display:flex;align-items:flex-start;gap:10px;font-size:.91rem;line-height:1.7;color:var(--text);font-family:Inter,sans-serif}.written-dot{width:7px;height:7px;border-radius:50%;flex-shrink:0;margin-top:7px;box-shadow:0 0 6px currentColor}.written-block-label{display:inline-block;font-family:Space Grotesk,sans-serif;font-size:.67rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--text-3);margin-bottom:8px}.written-diagram-wrap{display:flex;flex-direction:column}.written-diagram-pre{font-family:JetBrains Mono,monospace;font-size:.76rem;line-height:1.6;color:var(--text);background:var(--elevated);border:1px solid var(--border);border-radius:10px;padding:14px 16px;overflow-x:auto;white-space:pre;-moz-tab-size:2;tab-size:2;box-shadow:inset 0 1px 4px #0000000f}.written-mistakes-wrap{display:flex;flex-direction:column}.written-table-scroll{overflow-x:auto;border-radius:10px}.written-table{width:100%;border-collapse:collapse;font-size:.86rem;font-family:Inter,sans-serif;background:var(--elevated);border-radius:10px;overflow:hidden;border:1px solid var(--border)}.written-table th{font-family:Space Grotesk,sans-serif;font-size:.75rem;font-weight:700;letter-spacing:.02em;padding:10px 14px;text-align:left;background:color-mix(in srgb,var(--c, var(--accent)) 10%,var(--elevated));color:var(--text-2);border-bottom:1px solid var(--border-md)}.written-table td{padding:10px 14px;color:var(--text);line-height:1.55;vertical-align:top;border-bottom:1px solid var(--border)}.written-table tr:last-child td{border-bottom:none}.written-table tbody tr:hover td{background:var(--hover-bg)}.written-table-alt tbody tr:nth-child(2n) td{background:color-mix(in srgb,var(--accent) 3%,transparent)}.written-table-alt .highlight-row td{background:color-mix(in srgb,var(--c, var(--accent)) 12%,transparent);color:var(--text);font-weight:600}.written-mnemonic{display:flex;align-items:flex-start;gap:10px;border:1px solid;border-radius:10px;padding:12px 16px;font-size:.89rem;line-height:1.65;font-family:Inter,sans-serif;color:var(--text);font-style:italic}.written-ext-section{display:flex;flex-direction:column;gap:0}.written-ext-toggle{display:flex;align-items:center;gap:8px;font-family:Space Grotesk,sans-serif;font-size:.82rem;font-weight:700;padding:10px 16px;border-radius:8px;border:1.5px dashed;background:transparent;text-align:left;cursor:pointer;transition:background .18s ease,box-shadow .18s ease}.written-ext-toggle:hover{background:var(--hover-bg);box-shadow:0 0 0 1px #6366f126}.written-ext-toggle.open{border-style:solid;border-radius:8px 8px 0 0;border-bottom-color:transparent}.written-extended{border:1.5px solid color-mix(in srgb,var(--c, var(--accent)) 30%,transparent);border-top:none;border-radius:0 0 8px 8px;padding:16px;background:color-mix(in srgb,var(--c, var(--accent)) 4%,var(--elevated));display:flex;flex-direction:column;gap:0}@media (min-width: 600px){.written-page{padding:28px 24px 90px}.written-diagram-pre{font-size:.82rem}.written-table{font-size:.89rem}.mode-cards{grid-template-columns:1fr 1fr}.mode-card-written{grid-column:1 / -1}}.home-action-row{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:20px}.action-card{display:flex;flex-direction:column;padding:0;border-radius:20px;cursor:pointer;text-align:left;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);transition:all .28s cubic-bezier(.34,1.56,.64,1);position:relative;overflow:hidden;width:100%}.action-card:hover{transform:translateY(-5px) scale(1.02)}.ac-shine{position:absolute;top:0;right:0;bottom:0;left:0;z-index:0;pointer-events:none;background:linear-gradient(120deg,transparent 30%,rgba(255,255,255,.13) 50%,transparent 70%);transform:translate(-100%);transition:transform .55s ease}.action-card:hover .ac-shine{transform:translate(100%)}.ac-body{display:flex;flex-direction:column;gap:3px;padding:18px 16px 14px;position:relative;z-index:1;flex:1}.ac-icon-wrap{width:44px;height:44px;border-radius:14px;display:flex;align-items:center;justify-content:center;flex-shrink:0;margin-bottom:10px}.ac-icon{color:#fff}.ac-label{font-family:Space Grotesk,sans-serif;font-size:.92rem;font-weight:800;letter-spacing:-.02em;color:var(--text);line-height:1.2}.ac-sub{font-size:.7rem;color:var(--text-3);font-weight:500;margin-top:1px}.ac-footer{display:flex;align-items:center;justify-content:space-between;padding:9px 16px;font-family:Space Grotesk,sans-serif;font-size:.75rem;font-weight:700;position:relative;z-index:1;border-top:1px solid rgba(255,255,255,.08);transition:all .2s ease}.ac-arrow{transition:transform .2s ease}.action-card:hover .ac-arrow{transform:translate(4px)}.exam-card{background:linear-gradient(145deg,rgba(99,102,241,.14) 0%,var(--surface-glass) 60%);border:1px solid rgba(99,102,241,.28);box-shadow:var(--shadow-md),0 0 40px #6366f11a}.exam-card:hover{border-color:#6366f18c;box-shadow:var(--shadow-lg),0 0 60px #6366f133}.ac-icon-wrap--exam{background:var(--grad-brand);box-shadow:0 6px 20px #6366f180;animation:iconPulse 3.5s ease-in-out infinite}.ac-footer--exam{background:#6366f11a;color:var(--accent)}.exam-card:hover .ac-footer--exam{background:var(--grad-brand);color:#fff}.nailed-card{background:linear-gradient(145deg,rgba(245,158,11,.12) 0%,var(--surface-glass) 60%);border:1px solid rgba(245,158,11,.28);box-shadow:var(--shadow-md),0 0 40px #f59e0b14}.nailed-card:hover{border-color:#f59e0b8c;box-shadow:var(--shadow-lg),0 0 60px #f59e0b2e}.ac-icon-wrap--nailed{background:linear-gradient(135deg,#f59e0b,#f97316);box-shadow:0 6px 20px #f59e0b80}.ac-footer--nailed{background:#f59e0b1a;color:#d97706}[data-theme=dark] .ac-footer--nailed{color:#fbbf24}.nailed-card:hover .ac-footer--nailed{background:linear-gradient(135deg,#f59e0b,#f97316);color:#fff}.exam-mode-card{display:flex;align-items:center;gap:16px;width:100%;padding:20px 22px;margin-bottom:20px;background:var(--surface-glass);border:1px solid var(--border-md);border-radius:18px;cursor:pointer;text-align:left;box-shadow:var(--shadow-md),0 0 0 1px #6366f12e,0 0 40px #6366f114;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);transition:all .26s cubic-bezier(.34,1.56,.64,1);position:relative;overflow:hidden}.exam-mode-card:hover{border-color:var(--border-bright);transform:translateY(-4px) scale(1.01);box-shadow:var(--shadow-lg),0 0 0 1px #6366f166,0 0 60px #6366f12e}.emc-glow{position:absolute;top:-30px;left:-20px;width:140px;height:140px;border-radius:50%;background:var(--grad-brand);opacity:.12;filter:blur(18px);pointer-events:none;transition:opacity .3s ease}.exam-mode-card:hover .emc-glow{opacity:.22}.emc-icon-wrap{width:52px;height:52px;border-radius:14px;background:var(--grad-brand);display:flex;align-items:center;justify-content:center;flex-shrink:0;position:relative;z-index:1;box-shadow:0 6px 24px #6366f173;animation:iconPulse 3.5s ease-in-out infinite}.emc-icon{color:#fff}.emc-body{flex:1;min-width:0;position:relative;z-index:1}.emc-title{font-family:Space Grotesk,sans-serif;font-size:1.05rem;font-weight:800;letter-spacing:-.02em;background:var(--logo-grad);background-size:300% 100%;-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;animation:gradientFlow 6s linear infinite;margin-bottom:4px}.emc-sub{font-size:.78rem;color:var(--text-2);line-height:1.5;margin-bottom:10px}.emc-pills{display:flex;flex-wrap:wrap;gap:6px}.emc-pill{display:inline-flex;align-items:center;font-family:JetBrains Mono,monospace;font-size:.65rem;font-weight:600;padding:3px 9px;border-radius:6px;background:var(--accent-light);color:var(--accent);border:1px solid rgba(99,102,241,.2)}.emc-cta{display:flex;align-items:center;gap:6px;flex-shrink:0;position:relative;z-index:1;font-family:Space Grotesk,sans-serif;font-size:.82rem;font-weight:700;color:var(--accent);padding:8px 14px;border-radius:10px;border:1.5px solid rgba(99,102,241,.35);background:var(--accent-light);transition:all .2s ease}.exam-mode-card:hover .emc-cta{background:var(--grad-brand);color:#fff;border-color:transparent;box-shadow:0 4px 16px #6366f166}.emc-arrow{transition:transform .2s ease}.exam-mode-card:hover .emc-arrow{transform:translate(4px)}.exam-config-page{max-width:520px;margin:0 auto;padding:28px 16px 80px}.exam-config-hero{text-align:center;margin:36px 0 40px}.exam-config-icon{width:70px;height:70px;border-radius:20px;background:var(--grad-brand);display:flex;align-items:center;justify-content:center;margin:0 auto 20px;color:#fff;box-shadow:0 8px 32px #6366f16b;animation:iconPulse 3.5s ease-in-out infinite}.exam-config-title{font-family:Space Grotesk,sans-serif;font-size:1.9rem;font-weight:800;letter-spacing:-.04em;background:var(--logo-grad);background-size:300% 100%;-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;animation:gradientFlow 6s linear infinite;margin-bottom:10px}.exam-config-sub{color:var(--text-2);font-size:.9rem;line-height:1.6}.exam-config-form{background:var(--surface-glass);border:1px solid var(--border-md);border-radius:20px;padding:28px 24px;box-shadow:var(--shadow-md);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);display:flex;flex-direction:column;gap:24px}.exam-field{display:flex;flex-direction:column;gap:10px}.exam-label{font-family:Space Grotesk,sans-serif;font-size:.78rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--text-3);display:flex;align-items:center;justify-content:space-between}.exam-max-hint{font-family:JetBrains Mono,monospace;font-size:.72rem;font-weight:500;color:var(--accent);text-transform:none;letter-spacing:0}.exam-select{width:100%;padding:12px 40px 12px 16px;background:var(--elevated);border:1.5px solid var(--border-md);border-radius:12px;color:var(--text);font-size:.91rem;font-family:Inter,sans-serif;cursor:pointer;-webkit-appearance:none;-moz-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236366f1' stroke-width='2'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 14px center;transition:border-color .18s,box-shadow .18s}.exam-select:focus{outline:none;border-color:var(--border-bright);box-shadow:0 0 0 3px #6366f126}.exam-count-row{display:flex;align-items:center;gap:8px;justify-content:center}.exam-stepper{display:flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:10px;background:var(--elevated);border:1.5px solid var(--border-md);color:var(--text-2);font-size:.82rem;font-weight:700;font-family:Space Grotesk,sans-serif;cursor:pointer;transition:all .18s ease}.exam-stepper:hover:not(:disabled){border-color:var(--border-bright);color:var(--accent);background:var(--accent-light)}.exam-stepper:disabled{opacity:.35;cursor:default}.exam-count-display{font-family:Space Grotesk,sans-serif;font-size:2rem;font-weight:800;letter-spacing:-.04em;color:var(--accent);min-width:80px;text-align:center;background:var(--grad-brand);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.exam-start-btn{display:flex;align-items:center;justify-content:center;gap:8px;padding:15px;border-radius:12px;font-family:Space Grotesk,sans-serif;font-weight:700;font-size:.95rem;color:#fff;background:var(--grad-brand);box-shadow:0 4px 24px #6366f16b,0 0 0 1px #6366f140;transition:all .22s ease;cursor:pointer;position:relative;overflow:hidden}.exam-start-btn:hover:not(:disabled){transform:translateY(-3px);box-shadow:0 8px 36px #6366f18c}.exam-start-btn:disabled{opacity:.45;cursor:default}.exam-mode-pill{display:inline-flex;align-items:center;gap:6px;font-family:Space Grotesk,sans-serif;font-size:.78rem;font-weight:700;padding:5px 12px;border-radius:24px;background:var(--elevated);border:1px solid var(--border-md)}.exam-topic-tag{color:var(--text-3);font-size:.72rem;font-weight:500;font-family:JetBrains Mono,monospace}.exam-score-label{font-family:JetBrains Mono,monospace;font-size:.74rem;color:var(--text-3);margin-bottom:20px}.exam-stop-btn{display:inline-flex;align-items:center;gap:5px;padding:5px 12px;border-radius:20px;font-family:Space Grotesk,sans-serif;font-size:.75rem;font-weight:700;border:1.5px solid rgba(239,68,68,.35);background:#ef44440f;color:#ef4444;cursor:pointer;transition:all .18s ease}.exam-stop-btn:hover{background:#ef44441f;border-color:#ef444499;box-shadow:0 0 0 2px #ef44441f}.exam-stop-btn.confirm{background:#ef4444;color:#fff;border-color:#ef4444;box-shadow:0 0 12px #ef444466;animation:pulse-red .6s ease}@keyframes pulse-red{0%{transform:scale(1)}50%{transform:scale(1.08)}to{transform:scale(1)}}.study-card-actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.nail-btn{display:inline-flex;align-items:center;gap:5px;font-size:.72rem;font-weight:600;padding:4px 10px;border-radius:20px;background:var(--elevated);border:1px solid var(--border);color:var(--text-3);font-family:Space Grotesk,sans-serif;cursor:pointer;transition:all .18s ease}.nail-btn:hover:not(.nailed){border-color:#f59e0b;color:#f59e0b;background:#f59e0b14}.nail-btn.nailed{font-weight:700}.study-card-nailed{opacity:.45}.nailed-notice{display:flex;align-items:center;gap:8px;font-size:.82rem;padding:10px 14px;border:1px solid;border-radius:10px;margin-bottom:16px;background:var(--elevated)}.nailed-notice-link{font-weight:700;text-decoration:underline;background:none;border:none;cursor:pointer;color:inherit;font-size:inherit;font-family:inherit;padding:0}.study-all-nailed{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:80px 16px;text-align:center;color:var(--text-2);font-size:.95rem}.nailed-panel{margin-top:24px;background:var(--surface-glass);border:1px solid var(--border-md);border-radius:16px;overflow:hidden;box-shadow:var(--shadow-sm);backdrop-filter:blur(5px);-webkit-backdrop-filter:blur(5px)}.nailed-panel-header{display:flex;align-items:center;justify-content:space-between;width:100%;padding:16px 20px;background:none;border:none;cursor:pointer;color:var(--text-2);transition:background .18s ease}.nailed-panel-header:hover{background:var(--hover-bg)}.nailed-panel-title{display:flex;align-items:center;gap:8px;font-family:Space Grotesk,sans-serif;font-size:.9rem;font-weight:700;color:var(--text)}.nailed-count-badge{display:inline-flex;align-items:center;justify-content:center;background:#f59e0b26;color:#f59e0b;font-family:JetBrains Mono,monospace;font-size:.68rem;font-weight:700;padding:2px 8px;border-radius:8px;border:1px solid rgba(245,158,11,.3)}.nailed-panel-body{border-top:1px solid var(--border);padding:12px 16px 16px;display:flex;flex-direction:column;gap:16px;max-height:400px;overflow-y:auto}.nailed-topic-group{display:flex;flex-direction:column;gap:6px}.nailed-topic-label{display:flex;align-items:center;gap:7px;font-family:Space Grotesk,sans-serif;font-size:.72rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;margin-bottom:2px}.nailed-topic-dot{width:6px;height:6px;border-radius:50%;flex-shrink:0}.nailed-item{display:flex;align-items:flex-start;gap:8px;padding:8px 12px;border-radius:10px;background:var(--elevated);border:1px solid var(--border);transition:background .18s}.nailed-item:hover{background:var(--hover-bg)}.nailed-item-text{flex:1;font-size:.83rem;line-height:1.5;color:var(--text);font-family:Inter,sans-serif;min-width:0}.nailed-unnail-btn{flex-shrink:0;width:24px;height:24px;border-radius:6px;border:1px solid var(--border);background:var(--surface);color:var(--text-3);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .18s ease;margin-top:1px}.nailed-unnail-btn:hover{border-color:#ef4444;color:#ef4444;background:#ef444414}.nailed-screen{max-width:520px;margin:0 auto;padding:20px 16px 80px;min-height:100vh}.nailed-screen-topbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:24px}.nailed-screen-title{display:flex;align-items:center;gap:7px;font-family:Space Grotesk,sans-serif;font-size:1rem;font-weight:800;color:var(--text)}.nailed-screen-empty{display:flex;flex-direction:column;align-items:center;gap:12px;padding:80px 16px;text-align:center;color:var(--text-2)}.nailed-screen-empty p{font-size:1rem;font-weight:600;color:var(--text);margin:0}.nailed-screen-empty span{font-size:.84rem;line-height:1.6}.nailed-screen-summary{display:flex;align-items:baseline;gap:8px;margin-bottom:6px}.nailed-screen-total{font-family:Space Grotesk,sans-serif;font-size:2rem;font-weight:900;color:#f59e0b;line-height:1}.nailed-screen-total-label{font-size:.82rem;color:var(--text-2);font-weight:500}.nailed-screen-hint{font-size:.78rem;color:var(--text-3);margin-bottom:20px;display:flex;align-items:center;gap:4px;flex-wrap:wrap}.nailed-screen-list{display:flex;flex-direction:column;gap:12px}.nailed-group{background:var(--surface-glass);border:1px solid var(--border-md);border-radius:16px;overflow:hidden;backdrop-filter:blur(5px);-webkit-backdrop-filter:blur(5px)}.nailed-group-header{display:flex;align-items:center;justify-content:space-between;width:100%;padding:14px 16px;background:none;border:none;cursor:pointer;color:var(--text-2);transition:background .18s ease}.nailed-group-header:hover{background:var(--hover-bg)}.nailed-group-label{display:flex;align-items:center;gap:8px;font-family:Space Grotesk,sans-serif;font-size:.85rem;font-weight:700}.nailed-group-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0}.nailed-group-badge{font-family:JetBrains Mono,monospace;font-size:.65rem;font-weight:700;padding:2px 8px;border-radius:6px}.nailed-group-body{border-top:1px solid var(--border);padding:10px 12px 12px;display:flex;flex-direction:column;gap:6px}.nailed-row{display:flex;align-items:flex-start;gap:8px;padding:10px 12px;border-radius:10px;background:var(--elevated);border:1px solid var(--border);transition:background .18s}.nailed-row:hover{background:var(--hover-bg)}.nailed-row-body{flex:1;min-width:0;display:flex;flex-direction:column;gap:6px}.nailed-row-text{font-size:.84rem;line-height:1.55;color:var(--text);font-family:Inter,sans-serif}.nailed-row-answer{display:flex;align-items:center;gap:7px;padding:5px 10px;border-radius:8px;background:#10b98114;border:1px solid rgba(16,185,129,.2)}.nailed-ans-key{font-family:JetBrains Mono,monospace;font-size:.65rem;font-weight:800;color:#10b981;background:#10b98126;padding:1px 6px;border-radius:4px;flex-shrink:0}.nailed-ans-text{font-size:.8rem;font-weight:600;color:#10b981;font-family:Inter,sans-serif;line-height:1.4}@media (min-width: 600px){.exam-config-page{padding:48px 24px 90px}.emb-sub{display:block}}