:root{--font-sans: "Outfit", "Sarabun", system-ui, -apple-system, sans-serif;--background: 210 40% 98%;--foreground: 222 47% 11%;--primary: 221 83% 53%;--primary-hover: 221 83% 45%;--primary-foreground: 210 40% 98%;--card: 0 0% 100%;--card-foreground: 222 47% 11%;--card-border: 214 32% 91%;--muted: 215 16% 47%;--muted-background: 210 40% 96.1%;--accent: 262 83% 58%;--accent-foreground: 210 40% 98%;--border: 214.3 31.8% 91.4%;--ring: 221.2 83.2% 53.3%;--success: 142 71% 45%;--error: 346 84% 61%;--radius: 12px;--transition: all .3s cubic-bezier(.4, 0, .2, 1);--shadow: 0 4px 20px -2px rgba(0, 0, 0, .05), 0 2px 8px -1px rgba(0, 0, 0, .03)}[data-theme=dark]{--background: 224 71% 4%;--foreground: 213 31% 91%;--primary: 217.2 91.2% 59.8%;--primary-hover: 217.2 91.2% 50%;--primary-foreground: 222.2 47.4% 11.2%;--card: 224 71% 7%;--card-foreground: 213 31% 91%;--card-border: 224 71% 15%;--muted: 215.4 16.3% 56.9%;--muted-background: 223 47% 11%;--accent: 263.4 70% 50.4%;--accent-foreground: 210 40% 98%;--border: 224 71% 15%;--ring: 224.3 76.3% 48%;--shadow: 0 4px 30px rgba(0, 0, 0, .4), 0 2px 10px rgba(0, 0, 0, .2)}*{box-sizing:border-box;margin:0;padding:0;border-color:hsl(var(--border))}body{background-color:hsl(var(--background));color:hsl(var(--foreground));font-family:var(--font-sans);line-height:1.6;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;min-height:100vh;transition:background-color .3s ease,color .3s ease;overflow-x:hidden}.app-container{display:flex;flex-direction:column;min-height:100vh}.main-content{flex:1;width:100%;max-width:1200px;margin:0 auto;padding:2rem 1.5rem}.glass{background:#ffffffb3;backdrop-filter:blur(12px) saturate(180%);-webkit-backdrop-filter:blur(12px) saturate(180%);border:1px solid rgba(255,255,255,.3)}[data-theme=dark] .glass{background:#0f172a99;backdrop-filter:blur(12px) saturate(180%);-webkit-backdrop-filter:blur(12px) saturate(180%);border:1px solid rgba(255,255,255,.05)}@keyframes fadeInUp{0%{opacity:0;transform:translateY(15px)}to{opacity:1;transform:translateY(0)}}.animate-fade-in{animation:fadeInUp .4s cubic-bezier(.16,1,.3,1) forwards}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;font-family:var(--font-sans);font-size:.95rem;font-weight:500;padding:.625rem 1.25rem;border-radius:var(--radius);border:1px solid transparent;cursor:pointer;transition:var(--transition);-webkit-user-select:none;user-select:none;text-decoration:none}.btn-primary{background-color:hsl(var(--primary));color:hsl(var(--primary-foreground))}.btn-primary:hover{background-color:hsl(var(--primary-hover));transform:translateY(-1px);box-shadow:0 4px 12px #3b82f640}.btn-outline{background-color:transparent;border-color:hsl(var(--border));color:hsl(var(--foreground))}.btn-outline:hover{background-color:hsl(var(--muted-background));border-color:hsl(var(--muted))}.btn-accent{background-color:hsl(var(--accent));color:hsl(var(--accent-foreground))}.btn-accent:hover{transform:translateY(-1px);box-shadow:0 4px 12px #7c3aed40;opacity:.95}.card{background-color:hsl(var(--card));color:hsl(var(--card-foreground));border:1px solid hsl(var(--card-border));border-radius:var(--radius);padding:1.5rem;box-shadow:var(--shadow);transition:var(--transition)}.card-hover:hover{transform:translateY(-3px) scale(1.01);box-shadow:0 10px 30px -10px #0000001a;border-color:hsl(var(--primary) / .3)}.form-group{margin-bottom:1.25rem}.form-label{display:block;font-size:.875rem;font-weight:500;margin-bottom:.5rem;color:hsl(var(--foreground) / .8)}.form-input,.form-textarea,.form-select{width:100%;padding:.75rem 1rem;border-radius:var(--radius);border:1px solid hsl(var(--border));background-color:hsl(var(--card));color:hsl(var(--foreground));font-family:var(--font-sans);font-size:.95rem;outline:none;transition:var(--transition)}.form-input:focus,.form-textarea:focus,.form-select:focus{border-color:hsl(var(--primary));box-shadow:0 0 0 2px hsl(var(--primary) / .15)}h1,h2,h3,h4,h5,h6{font-weight:600;line-height:1.25;color:hsl(var(--foreground))}.text-gradient{background:linear-gradient(135deg,hsl(var(--primary)),hsl(var(--accent)));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.badge{display:inline-flex;align-items:center;font-size:.75rem;font-weight:600;padding:.25rem .625rem;border-radius:9999px;background-color:hsl(var(--muted-background));color:hsl(var(--foreground) / .8)}.badge-primary{background-color:hsl(var(--primary) / .1);color:hsl(var(--primary))}.katex-display{padding:.75rem;background-color:hsl(var(--muted-background) / .5);border-radius:var(--radius);overflow-x:auto;overflow-y:hidden;max-width:100%;margin:1rem 0;border:1px dashed hsl(var(--border))}.katex{font-size:1.1em}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:hsl(var(--background))}::-webkit-scrollbar-thumb{background:hsl(var(--border));border-radius:4px}::-webkit-scrollbar-thumb:hover{background:hsl(var(--muted) / .5)}.grid-2{display:grid;grid-template-columns:1fr;gap:1.5rem}@media (min-width: 768px){.grid-2{grid-template-columns:repeat(2,1fr)}}.grid-3{display:grid;grid-template-columns:1fr;gap:1.5rem}@media (min-width: 768px){.grid-3{grid-template-columns:repeat(2,1fr)}}@media (min-width: 1024px){.grid-3{grid-template-columns:repeat(3,1fr)}}.quiz-option-btn{display:flex;align-items:center;width:100%;padding:1rem 1.25rem;border-radius:var(--radius);border:2px solid hsl(var(--card-border));background-color:hsl(var(--card));color:hsl(var(--foreground));cursor:pointer;text-align:left;font-family:var(--font-sans);font-size:1rem;font-weight:500;transition:var(--transition);position:relative;overflow:hidden}.quiz-option-btn:hover{border-color:hsl(var(--primary));background-color:hsl(var(--primary) / .03)}.quiz-option-btn.selected{border-color:hsl(var(--primary));background-color:hsl(var(--primary) / .08)}.quiz-option-btn.correct{border-color:hsl(var(--success));background-color:hsl(var(--success) / .1)}.quiz-option-btn.incorrect{border-color:hsl(var(--error));background-color:hsl(var(--error) / .1)}.quiz-option-marker{display:flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:50%;border:2px solid hsl(var(--border));margin-right:.75rem;font-size:.875rem;font-weight:700;flex-shrink:0;transition:var(--transition)}.quiz-option-btn.selected .quiz-option-marker{border-color:hsl(var(--primary));background-color:hsl(var(--primary));color:hsl(var(--primary-foreground))}.quiz-option-btn.correct .quiz-option-marker{border-color:hsl(var(--success));background-color:hsl(var(--success));color:#fff}.quiz-option-btn.incorrect .quiz-option-marker{border-color:hsl(var(--error));background-color:hsl(var(--error));color:#fff}