@import"https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap";*{margin:0;padding:0;box-sizing:border-box}:root{--bg-primary: #0f0f1a;--bg-secondary: #1a1a2e;--bg-card: #16213e;--bg-elevated: #1f2b47;--bg-hover: #253553;--text-primary: #e8e8f0;--text-secondary: #a0a0b8;--text-muted: #6c6c88;--accent: #00d4aa;--accent-dim: rgba(0, 212, 170, .15);--accent-hover: #00f0c0;--warning: #f0b429;--danger: #ef4444;--success: #22c55e;--border: #2a2a44;--border-accent: #00d4aa44;--radius: 12px;--radius-sm: 8px;--shadow: 0 4px 24px rgba(0, 0, 0, .4);--shadow-lg: 0 8px 40px rgba(0, 0, 0, .5)}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:var(--bg-primary);color:var(--text-primary);min-height:100vh;font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}#root{max-width:1200px;margin:0 auto;padding:20px}.header{text-align:center;padding:40px 24px;background:linear-gradient(135deg,var(--bg-secondary) 0%,var(--bg-card) 100%);border-radius:var(--radius);margin-bottom:28px;border:1px solid var(--border);box-shadow:var(--shadow)}.header h1{font-size:2.2rem;font-weight:700;color:var(--text-primary);margin-bottom:8px}.header p{font-size:1.05rem;color:var(--text-secondary)}.mode-selector{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px;margin-bottom:28px}.mode-card{background:var(--bg-card);padding:28px 24px;border-radius:var(--radius);cursor:pointer;transition:all .25s ease;border:1px solid var(--border);text-align:center}.mode-card:hover{transform:translateY(-4px);border-color:var(--accent);box-shadow:0 8px 32px #00d4aa26}.mode-icon{font-size:2.8rem;margin-bottom:14px}.mode-card h3{font-size:1.25rem;font-weight:600;margin-bottom:8px;color:var(--text-primary)}.mode-card p{color:var(--text-secondary);font-size:.95rem}.content-area{background:var(--bg-secondary);padding:28px;border-radius:var(--radius);border:1px solid var(--border);box-shadow:var(--shadow);animation:fadeIn .3s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}.btn{padding:12px 24px;border:none;border-radius:var(--radius-sm);font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s ease;font-family:inherit}.btn-primary{background:var(--accent);color:#0f0f1a}.btn-primary:hover{background:var(--accent-hover);transform:translateY(-1px)}.btn-secondary{background:var(--bg-elevated);color:var(--text-primary);border:1px solid var(--border)}.btn-secondary:hover{background:var(--bg-hover);border-color:var(--text-muted)}.btn-danger{background:var(--danger);color:#fff}.btn-danger:hover{opacity:.9}.btn:disabled{opacity:.4;cursor:not-allowed;transform:none!important}.controls{display:flex;justify-content:center;gap:12px;flex-wrap:wrap;margin-top:20px}.progress-bar{width:100%;height:10px;background:var(--bg-elevated);border-radius:10px;overflow:hidden;margin-bottom:20px}.progress-fill{height:100%;background:linear-gradient(90deg,var(--accent),#00f0c0);transition:width .5s ease;border-radius:10px}.flashcard{perspective:1000px;margin:24px auto;max-width:680px;min-height:420px}.flashcard-inner{position:relative;width:100%;min-height:420px;text-align:center;transition:transform .6s;transform-style:preserve-3d;cursor:pointer}.flashcard-inner.flipped{transform:rotateY(180deg)}.flashcard-front,.flashcard-back{position:absolute;width:100%;min-height:420px;backface-visibility:hidden;border-radius:var(--radius);padding:36px;display:flex;flex-direction:column;justify-content:center;align-items:center;border:1px solid var(--border);box-shadow:var(--shadow)}.flashcard-front{background:linear-gradient(135deg,var(--bg-card) 0%,var(--bg-elevated) 100%)}.flashcard-back{background:var(--bg-elevated);transform:rotateY(180deg);overflow-y:auto;align-items:flex-start}.flashcard-hint{position:absolute;bottom:18px;font-size:.9rem;color:var(--text-muted);font-style:italic}.soils-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:18px;margin-top:18px}.soil-card{background:var(--bg-card);padding:24px;border-radius:var(--radius);border:1px solid var(--border);transition:all .25s ease}.soil-card:hover{border-color:var(--accent);transform:translateY(-3px);box-shadow:0 6px 20px #00d4aa1f}.soil-card h3{color:var(--accent);font-size:1.25rem;margin-bottom:10px}.soil-info{margin:6px 0;font-size:.95rem;line-height:1.6;color:var(--text-secondary)}.soil-info strong{color:var(--text-primary)}.tags{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}.tag{display:inline-block;padding:5px 12px;background:var(--accent-dim);border-radius:16px;font-size:.85rem;color:var(--accent);font-weight:600;border:1px solid var(--border-accent)}.tag.high{background:#f0b42926;color:var(--warning);border-color:#f0b4294d}.filter-section{margin-bottom:20px;padding:16px;background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border)}.filter-section h3{color:var(--text-primary);font-size:1rem;margin-bottom:10px}.filter-buttons{display:flex;gap:10px;flex-wrap:wrap}.filter-btn{padding:8px 16px;border:1px solid var(--border);background:var(--bg-elevated);border-radius:20px;cursor:pointer;transition:all .2s ease;font-size:.9rem;color:var(--text-secondary);font-weight:500;font-family:inherit}.filter-btn:hover{border-color:var(--accent);color:var(--accent)}.filter-btn.active{background:var(--accent);color:#0f0f1a;border-color:var(--accent);font-weight:600}.quiz-question{background:var(--bg-card);padding:28px;border-radius:var(--radius);margin-top:18px;border:1px solid var(--border)}.quiz-question h3{color:var(--text-secondary);margin-bottom:16px;font-size:1rem;font-weight:500}.quiz-options{display:flex;flex-direction:column;gap:12px;margin-top:18px}.quiz-option{padding:16px 20px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius-sm);cursor:pointer;transition:all .2s ease;font-size:1rem;text-align:left;color:var(--text-primary);font-family:inherit}.quiz-option:hover{border-color:var(--accent);background:var(--bg-hover)}.quiz-option.correct{background:#22c55e26;border-color:var(--success);color:var(--success);font-weight:600}.quiz-option.incorrect{background:#ef444426;border-color:var(--danger);color:var(--danger);font-weight:600}.result-screen{text-align:center;padding:32px}.result-emoji{font-size:4rem;margin-bottom:16px}.result-score{font-size:3.5rem;color:var(--accent);font-weight:700;margin:16px 0}.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;margin-bottom:24px}.stat-card{background:var(--bg-card);padding:22px;border-radius:var(--radius);text-align:center;border:1px solid var(--border);transition:all .2s ease}.stat-card:hover{border-color:var(--accent)}.stat-card h4{color:var(--text-secondary);font-size:.9rem;font-weight:500;margin-bottom:10px}.stat-card .value{font-size:2.2rem;font-weight:700;color:var(--accent)}.sr-badge{display:inline-flex;align-items:center;gap:6px;padding:4px 12px;border-radius:16px;font-size:.8rem;font-weight:600}.sr-badge.new{background:#6366f133;color:#818cf8}.sr-badge.learning{background:#f0b42933;color:var(--warning)}.sr-badge.review{background:#00d4aa33;color:var(--accent)}.sr-badge.mastered{background:#22c55e33;color:var(--success)}.modal-overlay{position:fixed;inset:0;background:#000000bf;display:flex;justify-content:center;align-items:center;z-index:1000;padding:20px}.modal-content{background:var(--bg-secondary);border-radius:var(--radius);padding:28px;max-width:700px;max-height:80vh;overflow:auto;width:100%;border:1px solid var(--border);box-shadow:var(--shadow-lg)}.nav-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(48px,1fr));gap:8px}.nav-btn{padding:10px;border-radius:var(--radius-sm);cursor:pointer;font-size:.95rem;font-family:inherit;font-weight:500;transition:all .2s;border:1px solid var(--border);background:var(--bg-card);color:var(--text-primary)}.nav-btn:hover{border-color:var(--accent)}.nav-btn.current{border-color:var(--accent);background:var(--accent-dim);font-weight:700}.nav-btn.correct-nav{background:#22c55e26;border-color:#22c55e66}.nav-btn.incorrect-nav{background:#ef444426;border-color:#ef444466}.explanation-box{margin-top:18px;padding:18px;border-radius:var(--radius-sm);border:1px solid}.explanation-box.correct-explain{background:#22c55e1a;border-color:#22c55e4d;color:var(--success)}.explanation-box.incorrect-explain{background:#ef44441a;border-color:#ef44444d;color:#fca5a5}.quiz-history-item{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;background:var(--bg-card);border-radius:var(--radius-sm);border:1px solid var(--border);margin-bottom:8px}::-webkit-scrollbar{width:8px}::-webkit-scrollbar-track{background:var(--bg-primary)}::-webkit-scrollbar-thumb{background:var(--bg-hover);border-radius:8px}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}@media(max-width:768px){#root{padding:12px}.header h1{font-size:1.6rem}.header{padding:28px 16px}.content-area{padding:18px}.mode-selector{grid-template-columns:1fr 1fr;gap:12px}.mode-card{padding:20px 16px}.soils-grid{grid-template-columns:1fr}.flashcard-front,.flashcard-back{min-height:380px;padding:24px 18px}.controls{flex-direction:column}.btn{width:100%}.stats{grid-template-columns:1fr 1fr}}@media(max-width:480px){.mode-selector,.stats{grid-template-columns:1fr}}