:root{color-scheme:dark;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5;--bg: #060612;--bg-card: rgba(255, 255, 255, .04);--bg-card-hover: rgba(255, 255, 255, .08);--border: rgba(255, 255, 255, .08);--border-hover: rgba(255, 255, 255, .16);--text: #e8e8f0;--text-dim: rgba(255, 255, 255, .5);--accent: #7c6aef;--accent-glow: rgba(124, 106, 239, .3);--correct: #34d399;--wrong: #f87171}*{box-sizing:border-box}html,body,#root{margin:0;min-height:100vh;background:var(--bg);color:var(--text)}.app{min-height:100vh;display:flex;flex-direction:column}.top-bar{display:flex;align-items:center;justify-content:space-between;padding:.75rem 1.5rem;border-bottom:1px solid var(--border);background:#060612e6;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);position:sticky;top:0;z-index:100}.logo{display:flex;align-items:center;gap:.5rem;background:none;border:none;color:var(--text);font-size:1.05rem;font-weight:600;cursor:pointer;letter-spacing:-.01em}.logo-icon{font-size:1.3rem}.nav{display:flex;gap:.25rem}.nav-btn{background:none;border:1px solid transparent;color:var(--text-dim);padding:.4rem 1rem;border-radius:.5rem;cursor:pointer;font-size:.85rem;transition:all .15s}.nav-btn:hover{color:var(--text);background:var(--bg-card)}.nav-btn.active{color:var(--text);border-color:var(--border);background:var(--bg-card)}.explore{flex:1;display:flex;flex-direction:column;align-items:center;padding:2rem 1.5rem 3rem;gap:2.5rem}.solar-system-wrapper{width:100%;max-width:800px;aspect-ratio:1;display:flex;align-items:center;justify-content:center;position:relative}.solar-system{position:relative;width:720px;height:720px}.sun{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:40px;height:40px;background:radial-gradient(circle,gold,#ff8c00);border-radius:50%;z-index:5}.sun-glow{position:absolute;top:-20px;right:-20px;bottom:-20px;left:-20px;background:radial-gradient(circle,rgba(255,200,0,.25),transparent 70%);border-radius:50%}.orbit{position:absolute;top:50%;left:50%;width:var(--orbit-size);height:var(--orbit-size);transform:translate(-50%,-50%);border:1px solid rgba(255,255,255,.06);border-radius:50%}.planet-btn{position:absolute;top:-6px;left:50%;transform:translate(-50%);background:none;border:none;cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:4px;z-index:10;padding:4px}.planet-dot{width:calc(var(--planet-size) * 2);height:calc(var(--planet-size) * 2);background:var(--planet-color);border-radius:50%;box-shadow:0 0 12px var(--planet-color);transition:transform .2s,box-shadow .2s}.planet-btn:hover .planet-dot,.planet-btn.hovered .planet-dot{transform:scale(1.4);box-shadow:0 0 24px var(--planet-color)}.planet-label{font-size:.65rem;color:var(--text-dim);white-space:nowrap;opacity:0;transition:opacity .2s}.planet-btn:hover .planet-label,.planet-btn.hovered .planet-label{opacity:1}.planet-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:.75rem;width:100%;max-width:800px}.planet-card{display:flex;align-items:center;gap:.75rem;padding:.75rem 1rem;background:var(--bg-card);border:1px solid var(--border);border-radius:.75rem;cursor:pointer;transition:all .15s;color:var(--text);text-align:left}.planet-card:hover{background:var(--bg-card-hover);border-color:var(--border-hover)}.planet-card-swatch{width:24px;height:24px;border-radius:50%;flex-shrink:0}.planet-card-info{flex:1;min-width:0}.planet-card-info h3{margin:0;font-size:.9rem;font-weight:600}.planet-card-type{font-size:.72rem;color:var(--text-dim)}.planet-card-arrow{color:var(--text-dim);font-size:1rem;transition:transform .15s}.planet-card:hover .planet-card-arrow{transform:translate(3px);color:var(--text)}.detail{flex:1;padding:2rem 1.5rem 3rem;max-width:800px;margin:0 auto;width:100%}.back-btn{background:none;border:1px solid var(--border);color:var(--text-dim);padding:.4rem .9rem;border-radius:.5rem;cursor:pointer;font-size:.8rem;transition:all .15s;margin-bottom:2rem}.back-btn:hover{color:var(--text);border-color:var(--border-hover)}.detail-hero{display:flex;align-items:center;gap:2rem;margin-bottom:2rem}.detail-planet-visual{flex-shrink:0;width:var(--planet-size-detail);height:var(--planet-size-detail)}.detail-planet-sphere{width:100%;height:100%;border-radius:50%;background:radial-gradient(circle at 35% 35%,var(--planet-color),color-mix(in srgb,var(--planet-color) 40%,#000));box-shadow:0 0 40px var(--planet-color),inset -10px -10px 20px #0006}.detail-hero-text h1{margin:0 0 .25rem;font-size:2rem;font-weight:700;letter-spacing:-.02em}.detail-type{display:inline-block;font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--text-dim);border:1px solid var(--border);padding:.15rem .5rem;border-radius:.25rem;margin-bottom:.75rem}.detail-desc{margin:0;color:#ffffffa6;font-size:.95rem;line-height:1.6}.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:.75rem;margin-bottom:2.5rem}.stat-card{background:var(--bg-card);border:1px solid var(--border);border-radius:.75rem;padding:1rem;display:flex;flex-direction:column;gap:.25rem}.stat-label{font-size:.7rem;text-transform:uppercase;letter-spacing:.08em;color:var(--text-dim)}.stat-value{font-size:1rem;font-weight:600}.facts-section h2{font-size:1.2rem;font-weight:600;margin:0 0 1rem}.facts-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:.6rem}.fact-item{display:flex;align-items:flex-start;gap:.75rem;padding:.75rem 1rem;background:var(--bg-card);border:1px solid var(--border);border-radius:.5rem;font-size:.9rem;color:#ffffffbf;line-height:1.5}.fact-bullet{width:8px;height:8px;border-radius:50%;flex-shrink:0;margin-top:.45rem}.quiz{flex:1;display:flex;flex-direction:column;align-items:center;padding:2rem 1.5rem 3rem;max-width:640px;margin:0 auto;width:100%}.quiz-header{display:flex;justify-content:space-between;width:100%;margin-bottom:.75rem}.quiz-progress{font-size:.8rem;color:var(--text-dim)}.quiz-score{font-size:.8rem;font-weight:600;color:var(--accent)}.quiz-progress-bar-wrapper{width:100%;height:4px;background:var(--bg-card);border-radius:2px;margin-bottom:2rem;overflow:hidden}.quiz-progress-bar{height:100%;background:var(--accent);border-radius:2px;transition:width .3s ease}.quiz-card{width:100%}.quiz-question{font-size:1.35rem;font-weight:600;margin:0 0 1.5rem;line-height:1.4}.quiz-options{display:flex;flex-direction:column;gap:.6rem;margin-bottom:1.5rem}.quiz-option{display:flex;align-items:center;gap:.75rem;padding:.85rem 1rem;background:var(--bg-card);border:1px solid var(--border);border-radius:.6rem;cursor:pointer;color:var(--text);font-size:.95rem;text-align:left;transition:all .15s}.quiz-option:hover:not(:disabled){background:var(--bg-card-hover);border-color:var(--border-hover)}.quiz-option.correct{background:#34d3991f;border-color:var(--correct);color:var(--correct)}.quiz-option.wrong{background:#f871711f;border-color:var(--wrong);color:var(--wrong)}.quiz-option.dimmed{opacity:.4}.option-letter{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:.4rem;background:#ffffff0f;font-size:.75rem;font-weight:700;flex-shrink:0}.quiz-option.correct .option-letter{background:#34d39933}.quiz-option.wrong .option-letter{background:#f8717133}.quiz-explanation{background:var(--bg-card);border:1px solid var(--border);border-radius:.75rem;padding:1.25rem;animation:fadeUp .25s ease}.quiz-explanation p{margin:0 0 1rem;color:#ffffffb3;font-size:.9rem;line-height:1.6}.quiz-result{display:flex;flex-direction:column;align-items:center;gap:1.5rem;padding-top:3rem;animation:fadeUp .3s ease}.result-score{display:flex;align-items:baseline;gap:.3rem}.result-number{font-size:4rem;font-weight:700;color:var(--accent)}.result-divider,.result-total{font-size:2rem;color:var(--text-dim)}.result-bar-wrapper{width:100%;max-width:300px;height:8px;background:var(--bg-card);border-radius:4px;overflow:hidden}.result-bar{height:100%;background:var(--accent);border-radius:4px;transition:width .6s ease}.quiz-result h2{margin:0;font-size:1.2rem;font-weight:600;text-align:center}.result-actions{display:flex;gap:.75rem}.btn{padding:.6rem 1.4rem;border-radius:.5rem;font-size:.85rem;font-weight:600;cursor:pointer;transition:all .15s;border:1px solid transparent}.btn-primary{background:var(--accent);color:#fff;border-color:var(--accent)}.btn-primary:hover{background:#6a56e0}.btn-secondary{background:var(--bg-card);color:var(--text);border-color:var(--border)}.btn-secondary:hover{background:var(--bg-card-hover);border-color:var(--border-hover)}@keyframes fadeUp{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@media(max-width:640px){.solar-system{width:360px;height:360px;transform:scale(.55);transform-origin:center}.solar-system-wrapper{aspect-ratio:1;max-height:320px}.detail-hero{flex-direction:column;text-align:center;align-items:center}.stats-grid{grid-template-columns:repeat(2,1fr)}.planet-cards{grid-template-columns:1fr}}