:root{--c-bg: #0b0b12;--c-bg-soft: #12101d;--c-surface: #171522;--c-surface-hover: #211e31;--c-border: rgba(255, 255, 255, .08);--c-border-hover: rgba(255, 255, 255, .18);--c-text: #f1f5f9;--c-text-muted: #a6b0c3;--c-accent: #6c5ce7;--c-accent-strong: #8f7cff;--c-accent-glow: rgba(108, 92, 231, .24);--c-correct: #00b894;--c-correct-bg: rgba(0, 184, 148, .1);--c-incorrect: #ff6b6b;--c-incorrect-bg: rgba(255, 107, 107, .1);--c-warning: #feca57;--c-warning-bg: rgba(254, 202, 87, .1);--radius: 12px;--radius-sm: 8px;--shadow: 0 12px 36px rgba(0, 0, 0, .22);--focus-ring: 0 0 0 3px rgba(108, 92, 231, .38);--transition: .2s cubic-bezier(.4, 0, .2, 1);--font: "Inter", system-ui, -apple-system, sans-serif}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{height:100%;-webkit-font-smoothing:antialiased}body{min-height:100%;font-family:var(--font);background-color:var(--c-bg);background-image:radial-gradient(900px 560px at 18% -8%,rgba(108,92,231,.18),transparent 72%),radial-gradient(760px 480px at 88% 6%,rgba(116,185,255,.07),transparent 74%),linear-gradient(180deg,var(--c-bg-soft) 0%,#0e0d17 42%,var(--c-bg) 100%);background-repeat:no-repeat;background-size:100% 100%;color:var(--c-text);line-height:1.6}#root{min-height:100vh}:focus-visible{outline:none;box-shadow:var(--focus-ring)}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;scroll-behavior:auto!important;transition-duration:.01ms!important}}.page-wrap{max-width:960px;margin:0 auto;padding:40px 20px 80px}.home-header{margin-bottom:40px}.home-header h1{font-size:2.2rem;font-weight:800;background:linear-gradient(135deg,var(--c-text),var(--c-accent),#8ce99a);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;letter-spacing:0}.home-header p{color:var(--c-text-muted);font-size:1rem;margin-top:8px}.course-section{margin-bottom:36px;animation:fadeInUp .5s ease both}.course-section 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.unit-title{font-size:.95rem;color:var(--c-text-muted);line-height:1.4}.unit-card:focus-visible,.grado-card:focus-visible,.quiz-back:focus-visible,.btn-primary:focus-visible,.btn-secondary:focus-visible,.btn-clear:focus-visible,.btn-validate:focus-visible,.submit-btn:focus-visible,.retry-btn:focus-visible,.tab-btn:focus-visible,.option-label:focus-within,.dropzone:focus-within{box-shadow:var(--focus-ring)}.quiz-container{max-width:800px;margin:0 auto;animation:fadeIn .4s ease}.quiz-back{display:inline-flex;align-items:center;gap:6px;color:var(--c-text-muted);text-decoration:none;font-size:.85rem;font-weight:500;margin-bottom:24px;padding:6px 12px;border-radius:var(--radius-sm);transition:color var(--transition),background var(--transition)}.quiz-back:hover{color:var(--c-text);background:var(--c-surface)}.quiz-header h1{font-size:1.8rem;font-weight:700;letter-spacing:-.3px;margin-bottom:8px}.quiz-progress{display:flex;align-items:center;gap:12px;color:var(--c-text-muted);font-size:.85rem;margin-bottom:32px}.quiz-progress-bar{flex:1;height:4px;background:var(--c-surface);border-radius:4px;overflow:hidden}.quiz-progress-fill{height:100%;background:linear-gradient(90deg,var(--c-accent),var(--c-accent));border-radius:4px;transition:width .4s ease}.question-card{background:var(--c-surface);border:1px solid var(--c-border);border-radius:var(--radius);padding:24px;margin-bottom:20px;animation:fadeInUp .4s ease both}.question-card h3{font-size:1rem;font-weight:600;margin-bottom:16px;line-height:1.5}.question-number{color:var(--c-accent);font-weight:700}.option-label{display:flex;align-items:flex-start;gap:12px;padding:12px 16px;margin-bottom:8px;background:#ffffff05;border:1px solid var(--c-border);border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition);font-size:.92rem;line-height:1.5}.option-label:hover{background:#6c5ce714;border-color:#6c5ce752}.option-label.selected{background:var(--c-accent-glow);border-color:var(--c-accent)}.option-label input[type=radio]{appearance:none;width:18px;height:18px;min-width:18px;border:2px solid var(--c-border-hover);border-radius:50%;margin-top:2px;transition:all var(--transition);position:relative}.option-label input[type=radio]:checked{border-color:var(--c-accent);background:var(--c-accent);box-shadow:inset 0 0 0 3px var(--c-surface)}.submit-btn{display:block;width:100%;padding:16px;background:#6c5ce724;border:1px solid rgba(108,92,231,.32);color:var(--c-accent);border:none;font-family:var(--font);font-size:1rem;font-weight:600;border-radius:var(--radius);cursor:pointer;transition:all var(--transition);margin-top:12px;letter-spacing:.3px}.submit-btn:hover{transform:translateY(-2px);box-shadow:0 8px 28px 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h2{font-size:1.6rem;font-weight:700;margin-bottom:20px}.score-big{font-size:4rem;font-weight:800;background:linear-gradient(135deg,var(--c-accent),var(--c-accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:8px}.score-percentage{font-size:1.1rem;color:var(--c-text-muted);margin-bottom:16px}.score-message{font-size:1rem;color:var(--c-text);margin-bottom:24px}.btn-restart{padding:12px 28px;background:transparent;color:var(--c-accent);border:2px solid var(--c-accent);border-radius:var(--radius-sm);font-family:var(--font);font-size:.95rem;font-weight:600;cursor:pointer;transition:all var(--transition)}.btn-restart:hover{background:var(--c-accent-glow)}@media(max-width:600px){.form-row{grid-template-columns:1fr}.user-actions{flex-direction:column}.builder-header{flex-direction:column;gap:12px;align-items:flex-start}}.dropzone{border:2px dashed var(--c-border);border-radius:var(--radius);padding:48px 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