:root{--primary:#c97a5a;--primary-hover:#a85e40;--secondary:#7a9e77;--secondary-hover:#6a8e67;--accent:#c97a5a;--background:#fbf7f4;--surface:#fff;--text-primary:#3d2b1f;--text-secondary:#6b4c3a;--text-tertiary:#9a7a6a;--border:#e8d8c8;--success:#7a9e77;--error:#ef4444;--warning:#f59e0b;--radius-sm:.25rem;--radius-md:.5rem;--radius-lg:1rem;--radius-xl:1.5rem;--shadow-sm:0 1px 2px 0 #3d2b1f0d;--shadow-md:0 4px 6px -1px #3d2b1f1a, 0 2px 4px -2px #3d2b1f1a;--shadow-lg:0 10px 15px -3px #3d2b1f1a, 0 4px 6px -4px #3d2b1f1a}.dark-theme{--primary:#d4886a;--primary-hover:#c06b4a;--secondary:#8ba888;--secondary-hover:#a5c2a2;--accent:#8ba888;--background:#1a1210;--surface:#2a1f1a;--text-primary:#f0e4d8;--text-secondary:#c8aa98;--text-tertiary:#8a6a5a;--border:#3d2b22;--success:#8ba888;--error:#f87171;--warning:#fbbf24;--shadow-sm:0 1px 2px 0 #0000004d;--shadow-md:0 4px 6px -1px #00000080, 0 2px 4px -2px #00000080;--shadow-lg:0 10px 15px -3px #00000080, 0 4px 6px -4px #00000080}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--background);color:var(--text-primary);-webkit-font-smoothing:antialiased;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.5}a{color:inherit;text-decoration:none}ul{list-style:none}.app-container{flex-direction:column;min-height:100vh;display:flex}.app-header{background-color:var(--surface);border-bottom:1px solid var(--border);z-index:10;box-shadow:var(--shadow-sm);justify-content:space-between;align-items:center;padding:1rem 2rem;display:flex;position:sticky;top:0}.logo{align-items:center;gap:.5rem;display:flex}.logo-text{color:var(--primary);letter-spacing:-.025em;font-size:1.25rem;font-weight:700}.nav-link{color:var(--text-secondary);margin-left:1.5rem;font-weight:500;transition:color .2s}.nav-link:hover{color:var(--primary)}.main-content{flex:1;width:100%;max-width:1200px;margin:0 auto;padding:2rem}.card{background:var(--surface);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);border:1px solid var(--border);padding:1.5rem;transition:transform .2s,box-shadow .2s}.card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}h1{color:var(--text-primary);letter-spacing:-.025em;margin-bottom:1rem;font-size:2.25rem;font-weight:700}h2{color:var(--text-primary);margin-bottom:.75rem;font-size:1.5rem;font-weight:600}h3{color:var(--text-primary);margin-bottom:.5rem;font-size:1.25rem;font-weight:600}p{color:var(--text-secondary);margin-bottom:1rem}.btn{border-radius:var(--radius-md);cursor:pointer;border:none;justify-content:center;align-items:center;gap:.5rem;padding:.75rem 1.5rem;font-family:inherit;font-size:1rem;font-weight:600;transition:all .2s;display:inline-flex}.btn-primary{background-color:var(--primary);color:#fff;box-shadow:0 4px 6px -1px #2563eb4d}.btn-primary:hover{background-color:var(--primary-hover);transform:translateY(-1px);box-shadow:0 6px 8px -1px #2563eb66}.btn-secondary{background-color:var(--surface);color:var(--text-primary);border:1px solid var(--border)}.btn-secondary:hover{background-color:var(--background);border-color:var(--text-tertiary)}.btn-accent{background-color:var(--accent);color:#fff}.btn-accent:hover{background-color:#7c3aed}.btn:disabled{opacity:.6;cursor:not-allowed;box-shadow:none!important;transform:none!important}.dashboard-grid{grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:1.5rem;margin-top:2rem;display:grid}.domain-stat{flex-direction:column;display:flex}.domain-stat-header{justify-content:space-between;margin-bottom:.5rem;font-size:.9rem;font-weight:500;display:flex}.progress-bar-bg{background-color:var(--border);border-radius:9999px;height:8px;overflow:hidden}.progress-bar-fill{border-radius:9999px;height:100%;transition:width .5s ease-out}.quiz-header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;margin-bottom:2rem;padding-bottom:1rem;display:flex}.question-text{margin-bottom:2rem;font-size:1.25rem;font-weight:500;line-height:1.6}.options-list{flex-direction:column;gap:1rem;display:flex}.option-btn{text-align:left;border:2px solid var(--border);background:var(--surface);border-radius:var(--radius-lg);color:var(--text-secondary);cursor:pointer;align-items:flex-start;gap:1rem;padding:1rem 1.5rem;font-size:1rem;transition:all .2s;display:flex}.option-btn:hover:not(:disabled){border-color:var(--primary);background:#f0fdfa;transform:translate(4px)}.option-btn.selected{border-color:var(--primary);color:var(--primary);background:#eff6ff;font-weight:500}.option-btn.correct{border-color:var(--success);color:var(--success);background:#ecfdf5}.option-btn.wrong{border-color:var(--error);color:var(--error);background:#fef2f2}.confidence-selector{border-top:1px dashed var(--border);margin-top:2rem;padding-top:2rem}.confidence-selector h4{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.05em;margin-bottom:1rem;font-size:.9rem}.confidence-btns{gap:1rem;display:flex}.conf-btn{border:1px solid var(--border);border-radius:var(--radius-md);background:var(--surface);cursor:pointer;flex:1;padding:.75rem;font-weight:500;transition:all .2s}.conf-btn.baja:hover,.conf-btn.baja.selected{border-color:var(--error);color:var(--error);background:#fef2f2}.conf-btn.media:hover,.conf-btn.media.selected{border-color:var(--warning);color:var(--warning);background:#fffbeb}.conf-btn.alta:hover,.conf-btn.alta.selected{border-color:var(--success);color:var(--success);background:#ecfdf5}.rationale-box{border-left:4px solid var(--primary);border-radius:0 var(--radius-lg) var(--radius-lg) 0;background:#f8fafc;margin-top:2rem;padding:1.5rem;animation:.3s ease-out slideIn}@keyframes slideIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.rationale-box h4{color:var(--primary);align-items:center;gap:.5rem;margin-bottom:.5rem;display:flex}.text-center{text-align:center}.mt-4{margin-top:1rem}.mb-4{margin-bottom:1rem}.mb-8{margin-bottom:2rem}.flex-center{justify-content:center;align-items:center;display:flex}.gap-2{gap:.5rem}.gap-4{gap:1rem}.badge{text-transform:uppercase;letter-spacing:.05em;border-radius:9999px;padding:.25rem .75rem;font-size:.75rem;font-weight:600}.badge-study{color:#4f46e5;background:#e0e7ff}.badge-exam{color:#ef4444;background:#fee2e2}.flashcard{perspective:1000px;cursor:pointer;width:100%;height:300px}.flashcard-inner{text-align:center;width:100%;height:100%;transform-style:preserve-3d;transition:transform .6s;position:relative}.flashcard.flipped .flashcard-inner{transform:rotateY(180deg)}.flashcard-front,.flashcard-back{backface-visibility:hidden;border-radius:var(--radius-lg);width:100%;height:100%;box-shadow:var(--shadow-md);border:1px solid var(--border);flex-direction:column;justify-content:center;align-items:center;padding:2rem;display:flex;position:absolute}.flashcard-front{background-color:var(--surface);color:var(--text-primary)}.flashcard-back{color:var(--primary);border:2px solid var(--primary);background-color:#f8fafc;transform:rotateY(180deg)}.main-nav{align-items:center;gap:.5rem;display:flex}.mobile-menu-btn{color:var(--text-primary);cursor:pointer;background:0 0;border:none;font-size:1.5rem;display:none}.dark-mode-btn{border:1px solid var(--border);cursor:pointer;color:var(--text-primary);background:0 0;border-radius:1rem;margin-left:1rem;padding:.25rem .75rem;font-family:inherit}@media (width<=768px){.app-header{padding:1rem}.mobile-menu-btn{z-index:50;display:block}.main-nav{background-color:var(--surface);border-bottom:1px solid var(--border);box-shadow:var(--shadow-md);z-index:40;flex-direction:column;gap:1rem;padding:1rem;transition:transform .3s ease-in-out;display:flex;position:fixed;top:60px;left:0;right:0;transform:translateY(-150%)}.main-nav.open{transform:translateY(0)}.nav-link{text-align:center;border-bottom:1px solid var(--border);width:100%;margin-left:0;padding:.5rem 0}.dark-mode-btn{width:100%;margin-top:.5rem;margin-left:0}.main-content{padding:1rem}h1{font-size:1.75rem}h2{font-size:1.3rem}h3{font-size:1.15rem}.card{padding:1rem}.dashboard-grid{grid-template-columns:1fr}select,input[type=number],.btn{width:100%}.grid-2{grid-template-columns:1fr!important}.confidence-btns{flex-direction:column}.quiz-header{flex-direction:column;align-items:flex-start;gap:.5rem}.flashcard{height:350px}}