@import "https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Plus+Jakarta+Sans:wght@500;600;700;800&family=JetBrains+Mono:wght@400;600;700&display=swap";:root{--bg-primary:#f8fafc;--bg-secondary:#f1f5f9;--bg-card:#fff;--bg-card-hover:#f8fafc;--text-primary:#0f172a;--text-secondary:#334155;--text-muted:#64748b;--primary:#2563eb;--primary-hover:#1d4ed8;--primary-light:#eff6ff;--accent:#059669;--accent-hover:#047857;--accent-light:#ecfdf5;--success:#16a34a;--warning:#d97706;--error:#dc2626;--info:#2563eb;--border:#cbd5e1;--border-light:#e2e8f0;--shadow-sm:0 1px 2px #0f172a0a;--shadow-md:0 1px 3px #0f172a0f, 0 4px 12px #0f172a0a;--shadow-lg:0 10px 24px -4px #0f172a14, 0 4px 8px -2px #0f172a0a;--shadow-glow:0 4px 12px #2563eb38;--radius-sm:.375rem;--radius-md:.5rem;--radius-lg:.75rem;--radius-xl:.875rem;--radius-full:9999px;--transition-fast:.14s cubic-bezier(.4, 0, .2, 1);--transition-normal:.22s cubic-bezier(.4, 0, .2, 1);--transition-slow:.32s cubic-bezier(.4, 0, .2, 1)}.dark{--bg-primary:#090d16;--bg-secondary:#111827;--bg-card:#151e2e;--bg-card-hover:#1e293b;--text-primary:#f8fafc;--text-secondary:#cbd5e1;--text-muted:#94a3b8;--primary:#3b82f6;--primary-hover:#2563eb;--primary-light:#3b82f624;--accent:#10b981;--accent-hover:#059669;--accent-light:#10b98124;--border:#26334a;--border-light:#1e293b;--shadow-sm:0 1px 2px #00000040;--shadow-md:0 2px 8px #00000052;--shadow-lg:0 12px 28px -4px #0000007a;--shadow-glow:0 4px 14px #3b82f647}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent;margin:0;padding:0}html,body{max-width:100vw;overflow-x:hidden}body{background-color:var(--bg-primary);color:var(--text-primary);transition:background-color var(--transition-normal), color var(--transition-normal);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe 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var(--accent);color:#fff!important}.btn-accent:hover:not(:disabled){background-color:var(--accent-hover)}.btn-danger{background-color:var(--error);border:1px solid var(--error);color:#fff!important}.btn-ghost{color:var(--text-secondary);background-color:#0000;border:1px solid #0000}:root:not(.dark) .btn-ghost{color:#334155}.btn-ghost:hover:not(:disabled){background-color:var(--bg-secondary);color:var(--text-primary)}.btn-sm{padding:.38rem .75rem;font-size:.78rem}.btn-lg{padding:.75rem 1.5rem;font-size:.95rem}.input-group{flex-direction:column;gap:.375rem;margin-bottom:.5rem;display:flex}.input-label{color:var(--text-primary);font-size:.82rem;font-weight:600}.input,select.input,textarea.input{border-radius:var(--radius-md);background-color:var(--bg-card);border:1px solid var(--border);width:100%;color:var(--text-primary);transition:border-color var(--transition-fast), box-shadow var(--transition-fast);outline:none;padding:.625rem .875rem;font-size:.875rem;font-weight:500}:root:not(.dark) .input,:root:not(.dark) select,:root:not(.dark) textarea,:root:not(.dark) input[type=text],:root:not(.dark) input[type=email],:root:not(.dark) input[type=password],:root:not(.dark) input[type=number]{color:#0f172a;background-color:#fff;border:1px solid #cbd5e1}.input:focus,select:focus,textarea:focus{box-shadow:0 0 0 3px #2563eb24;border-color:var(--primary)!important}.input::placeholder{color:var(--text-muted)}table th{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.03em;font-size:.78rem;font-weight:600}:root:not(.dark) table tr{border-bottom-color:#e2e8f0}.badge{border-radius:var(--radius-md);border:1px solid #0000;align-items:center;padding:.2rem 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var(--border);border-radius:var(--radius-xl);width:100%;box-shadow:var(--shadow-lg);text-align:center;padding:2rem;position:relative;overflow:hidden}.mini-game-question{color:var(--text-primary);font-variant-numeric:tabular-nums;margin:2rem 0;font-size:3rem;font-weight:700}.mini-game-buttons{justify-content:center;gap:1rem;margin-top:2rem;display:flex}.mini-game-buttons .btn{flex:1;max-width:200px;padding:1.25rem;font-size:1.25rem;font-weight:700}.mini-game-score{color:var(--primary);background:var(--primary-light);border-radius:var(--radius-full);padding:.5rem 1rem;font-size:1.5rem;font-weight:800;position:absolute;top:1.5rem;right:1.5rem}.mini-game-score.animate{animation:.3s cubic-bezier(.175,.885,.32,1.275) popScore}@keyframes popScore{0%{transform:scale(1)}50%{transform:scale(1.2)}to{transform:scale(1)}}.mini-game-leaderboard{background:var(--bg-secondary);border-radius:var(--radius-lg);width:100%;margin-top:2rem;padding:1.5rem}body.exam-mode{overflow:hidden}.exam-container{background:var(--bg-primary);flex-direction:column;height:100vh;display:flex;overflow:hidden}.exam-header{background:var(--bg-card);border-bottom:1px solid var(--border);z-index:20;box-shadow:var(--shadow-sm);justify-content:space-between;align-items:center;padding:1rem 1.5rem;display:flex}.exam-split{flex:1;display:flex;position:relative;overflow:hidden}@media (width<=992px){.exam-split{flex-direction:column}}.exam-pdf{background:#e5e7eb;flex-direction:column;flex:1;align-items:center;padding:1rem;display:flex;position:relative;overflow:auto}.dark .exam-pdf{background:#374151}.exam-panel{background:var(--bg-card);border-left:1px solid var(--border);z-index:10;flex-direction:column;width:400px;display:flex}@media (width<=992px){.exam-panel{border-left:none;border-top:1px solid var(--border);width:100%;height:40vh}}.question-nav{border-bottom:1px solid var(--border);background:var(--bg-secondary);gap:.5rem;padding:1rem;display:flex;overflow-x:auto}.question-num{background:var(--bg-card);border:1px solid var(--border);min-width:2.5rem;height:2.5rem;color:var(--text-secondary);cursor:pointer;transition:all var(--transition-fast);-webkit-user-select:none;user-select:none;border-radius:50%;justify-content:center;align-items:center;font-weight:600;display:flex}.question-num:hover{border-color:var(--primary);color:var(--primary)}.question-num.answered{background:var(--primary);color:#fff;border-color:var(--primary)}.question-num.current{box-shadow:0 0 0 3px var(--primary-light);border-color:var(--primary);transform:scale(1.1)}.answer-options{flex-direction:column;flex:1;gap:1rem;padding:2rem;display:flex;overflow-y:auto}.answer-btn{background:var(--bg-secondary);border-radius:var(--radius-lg);color:var(--text-primary);cursor:pointer;transition:all var(--transition-fast);border:2px solid #0000;align-items:center;padding:1.5rem;font-size:1.25rem;font-weight:600;display:flex}.answer-btn:before{content:attr(data-letter);background:var(--bg-card);width:2rem;height:2rem;box-shadow:var(--shadow-sm);color:var(--text-secondary);border-radius:50%;justify-content:center;align-items:center;margin-right:1rem;display:flex}.answer-btn:hover{background:var(--bg-card);border-color:var(--border);box-shadow:var(--shadow-md);transform:translateY(-2px)}.answer-btn.selected{background:var(--primary-light);border-color:var(--primary);color:var(--primary)}.answer-btn.selected:before{background:var(--primary);color:#fff}.timer{color:var(--text-primary);align-items:center;gap:.5rem;font-family:monospace;font-size:1.5rem;font-weight:700;display:flex}.timer.warning{color:var(--error);animation:1s infinite pulse}.watermark{pointer-events:none;z-index:50;opacity:.04;flex-wrap:wrap;place-content:space-around;display:flex;position:absolute;inset:0;overflow:hidden}.watermark span{color:#000;white-space:nowrap;-webkit-user-select:none;user-select:none;font-size:1.5rem;font-weight:700;transform:rotate(-45deg)}.dark .watermark span{color:#fff}.anti-cheat-warning{-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:9999;color:#fff;text-align:center;background:#ef4444f2;flex-direction:column;justify-content:center;align-items:center;padding:2rem;display:flex;position:fixed;inset:0}.anti-cheat-warning h1{margin-bottom:1rem;font-size:3rem;font-weight:800}.anti-cheat-warning p{max-width:600px;font-size:1.25rem}.submit-bar{background:var(--bg-card);border-top:1px solid var(--border);justify-content:flex-end;padding:1.5rem;display:flex}.submit-bar .btn{width:100%}.live-leaderboard{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);width:250px;box-shadow:var(--shadow-lg);z-index:30;opacity:.8;max-height:300px;transition:opacity var(--transition-fast);position:absolute;top:1rem;right:1rem;overflow-y:auto}.live-leaderboard:hover{opacity:1}.math-keyboard{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-xl);width:320px;overflow:hidden}.math-keyboard-tabs{background:var(--bg-secondary);border-bottom:1px solid var(--border);display:flex}.math-keyboard-tabs button{color:var(--text-secondary);transition:all var(--transition-fast);flex:1;padding:.75rem;font-size:.875rem;font-weight:600}.math-keyboard-tabs button.active{background:var(--bg-card);color:var(--primary);border-bottom:2px solid var(--primary)}.math-keyboard-grid{grid-template-columns:repeat(4,1fr);gap:.5rem;padding:1rem;display:grid}.math-key{aspect-ratio:1;background:var(--bg-secondary);border:1px solid var(--border);border-radius:var(--radius-md);color:var(--text-primary);cursor:pointer;transition:all var(--transition-fast);-webkit-user-select:none;user-select:none;justify-content:center;align-items:center;font-family:serif;font-size:1.25rem;display:flex}.math-key:hover{background:var(--primary-light);border-color:var(--primary);color:var(--primary);transform:scale(1.05)}.math-key:active{transform:scale(.95)}.loader{border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;width:2rem;height:2rem;animation:1s ease-in-out infinite spin;display:inline-block}.loader-fullpage{background:var(--bg-primary);z-index:9999;flex-direction:column;justify-content:center;align-items:center;display:flex;position:fixed;inset:0}.loader-fullpage .loader{border-width:4px;width:4rem;height:4rem;margin-bottom:1.5rem}.skeleton{background:linear-gradient(90deg, var(--bg-secondary) 25%, var(--border) 50%, var(--bg-secondary) 75%);border-radius:var(--radius-sm);background-size:200% 100%;animation:1.5s linear infinite shimmer}.skeleton-text{width:100%;height:1rem;margin-bottom:.5rem}.skeleton-text.short{width:60%}.skeleton-avatar{border-radius:50%;width:3rem;height:3rem}.skeleton-card{border-radius:var(--radius-lg);width:100%;height:200px}.empty-state{text-align:center;color:var(--text-muted);flex-direction:column;justify-content:center;align-items:center;padding:4rem 2rem;display:flex}.empty-state svg{opacity:.5;width:120px;height:120px;margin-bottom:1.5rem}.empty-state h3{color:var(--text-primary);margin-bottom:.5rem;font-size:1.25rem;font-weight:600}.notification-badge{position:relative}.notification-badge:after{content:"";background:var(--error);border:2px solid var(--bg-card);border-radius:50%;width:10px;height:10px;position:absolute;top:-4px;right:-4px}.lang-switch,.theme-toggle{background:var(--bg-secondary);width:2.5rem;height:2.5rem;color:var(--text-primary);transition:all var(--transition-fast);border:1px solid #0000;border-radius:50%;justify-content:center;align-items:center;display:flex}.lang-switch:hover,.theme-toggle:hover{background:var(--bg-card);border-color:var(--border);box-shadow:var(--shadow-sm)}.breadcrumb{color:var(--text-muted);align-items:center;gap:.5rem;font-size:.875rem;display:flex}.breadcrumb a{color:var(--text-secondary);transition:color var(--transition-fast)}.breadcrumb a:hover{color:var(--primary)}.breadcrumb-separator{margin:0 .25rem}.progress-bar-container{background:var(--bg-secondary);border-radius:var(--radius-full);width:100%;height:8px;overflow:hidden}.progress-bar{background:var(--primary);border-radius:var(--radius-full);height:100%;transition:width .3s}.timer-ring{width:120px;height:120px;position:relative}.timer-ring svg{width:100%;height:100%;transform:rotate(-90deg)}.timer-ring circle{fill:none;stroke-width:8px;stroke-linecap:round}.timer-ring .bg{stroke:var(--bg-secondary)}.timer-ring .progress{stroke:var(--primary);transition:stroke-dashoffset 1s linear}.timer-ring .time-text{color:var(--text-primary);justify-content:center;align-items:center;font-size:1.5rem;font-weight:700;display:flex;position:absolute;inset:0}