:root{--bg-primary: #0d1117;--bg-secondary: #161b22;--bg-card: #1c2128;--bg-elevated: #22272e;--bg-hover: #2d333b;--border: #30363d;--border-muted: #21262d;--text-primary: #e6edf3;--text-secondary: #8b949e;--text-muted: #6e7681;--accent: #e6a817;--accent-hover: #f0c847;--accent-dim: rgba(230, 168, 23, .12);--accent-dim-hover: rgba(230, 168, 23, .22);--success: #3fb950;--success-bg: rgba(63, 185, 80, .12);--success-border: rgba(63, 185, 80, .35);--error: #f85149;--error-bg: rgba(248, 81, 73, .12);--error-border: rgba(248, 81, 73, .35);--warning: #d29922;--warning-bg: rgba(210, 153, 34, .12);--info: #388bfd;--info-bg: rgba(56, 139, 253, .12)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,system-ui,-apple-system,sans-serif;background-color:var(--bg-primary);min-height:100vh;color:var(--text-primary);font-size:1.125rem;line-height:1.7}.app{min-height:100vh;padding:20px}.container{max-width:1400px;margin:0 auto}.header{text-align:center;padding:40px 24px;background:linear-gradient(135deg,#1a1206,#2a1e08);border-radius:16px;margin-bottom:30px;box-shadow:0 4px 24px #00000080;border:1px solid var(--accent-dim)}.header h1{font-size:2.8rem;color:var(--accent);margin-bottom:10px;font-weight:700;letter-spacing:-.5px}.header p{font-size:1.2rem;color:var(--text-secondary);font-style:italic}.mode-selector{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px;margin-bottom:30px}.mode-card{background:var(--bg-card);padding:30px 24px;border-radius:14px;cursor:pointer;transition:all .25s ease;border:1px solid var(--border);box-shadow:0 2px 12px #0000004d;position:relative;overflow:hidden}.mode-card:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:var(--accent-dim);opacity:0;transition:opacity .25s;border-radius:14px}.mode-card:hover{transform:translateY(-6px);border-color:var(--accent);box-shadow:0 8px 28px #e6a81733}.mode-card:hover:before{opacity:1}.mode-icon{font-size:2.8rem;margin-bottom:14px;text-align:center;position:relative}.mode-card h3{font-size:1.5rem;margin-bottom:8px;color:var(--text-primary);text-align:center;font-weight:600;position:relative}.mode-card p{color:var(--text-secondary);text-align:center;font-size:1.05rem;line-height:1.5;position:relative}.mode-card-due{text-align:center;margin-top:10px;font-size:.9rem;font-weight:600;color:var(--accent);position:relative}.content-area{background:var(--bg-secondary);padding:28px;border-radius:16px;box-shadow:0 4px 24px #0000004d;border:1px solid var(--border);animation:fadeIn .3s ease}.btn{padding:13px 26px;border:none;border-radius:8px;font-size:1.05rem;cursor:pointer;transition:all .2s ease;font-weight:600;display:inline-flex;align-items:center;gap:6px}.btn:disabled{opacity:.4;cursor:not-allowed;transform:none!important}.btn-primary{background:var(--accent);color:#0d0a00}.btn-primary:hover:not(:disabled){background:var(--accent-hover);transform:translateY(-2px);box-shadow:0 4px 16px #e6a81766}.btn-secondary{background:var(--bg-elevated);color:var(--text-primary);border:1px solid var(--border)}.btn-secondary:hover:not(:disabled){background:var(--bg-hover);border-color:var(--accent);transform:translateY(-2px)}.btn-danger{background:var(--error-bg);color:var(--error);border:1px solid var(--error-border)}.btn-danger:hover:not(:disabled){background:var(--error);color:#fff;transform:translateY(-2px)}.srs-buttons{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:20px}.btn-again{background:var(--error-bg);color:var(--error);border:1px solid var(--error-border);padding:13px 22px;font-size:1.05rem}.btn-again:hover{background:var(--error);color:#fff;transform:translateY(-2px)}.btn-hard{background:var(--warning-bg);color:var(--warning);border:1px solid rgba(210,153,34,.35);padding:13px 22px;font-size:1.05rem}.btn-hard:hover{background:var(--warning);color:#0d0a00;transform:translateY(-2px)}.btn-good{background:var(--info-bg);color:var(--info);border:1px solid rgba(56,139,253,.35);padding:13px 22px;font-size:1.05rem}.btn-good:hover{background:var(--info);color:#fff;transform:translateY(-2px)}.btn-easy{background:var(--success-bg);color:var(--success);border:1px solid var(--success-border);padding:13px 22px;font-size:1.05rem}.btn-easy:hover{background:var(--success);color:#0d1117;transform:translateY(-2px)}.controls{display:flex;justify-content:center;gap:12px;flex-wrap:wrap;margin-top:20px}.progress-bar{width:100%;height:8px;background:var(--bg-elevated);border-radius:10px;overflow:hidden;margin-bottom:24px;border:1px solid var(--border-muted)}.progress-fill{height:100%;background:linear-gradient(90deg,var(--accent) 0%,var(--accent-hover) 100%);transition:width .4s ease;border-radius:10px}.flashcard{perspective:1000px;margin:24px auto;max-width:720px;min-height:480px}.flashcard-inner{position:relative;width:100%;min-height:480px;text-align:center;transition:transform .6s cubic-bezier(.4,0,.2,1);transform-style:preserve-3d;cursor:pointer}.flashcard-inner.flipped{transform:rotateY(180deg)}.flashcard-front,.flashcard-back{position:absolute;width:100%;min-height:480px;backface-visibility:hidden;border-radius:16px;padding:40px 36px;display:flex;flex-direction:column;justify-content:center;box-shadow:0 6px 24px #0006;border:1px solid var(--border)}.flashcard-front{background:linear-gradient(145deg,#1a1206,#241a08);color:var(--text-primary);border-color:#e6a81740}.flashcard-front h2{font-size:2.6rem;color:var(--accent);margin-bottom:16px;font-weight:700}.flashcard-front .card-category{font-size:1.25rem;color:var(--text-secondary);margin-bottom:10px}.flashcard-front .card-type{font-size:1.1rem;color:var(--text-muted)}.flashcard-back{background:var(--bg-card);color:var(--text-primary);transform:rotateY(180deg);overflow-y:auto;border-color:var(--border);justify-content:flex-start}.flashcard-hint{position:absolute;bottom:18px;left:50%;transform:translate(-50%);font-size:.88rem;color:var(--text-muted);font-style:italic;white-space:nowrap}.mineral-info-row{margin:9px 0;font-size:1.1rem;line-height:1.6;color:var(--text-primary);text-align:left}.mineral-info-row strong{color:var(--accent);margin-right:6px}.srs-info{margin-top:18px;padding:10px 14px;background:var(--bg-elevated);border-radius:8px;border:1px solid var(--border-muted);font-size:.9rem;color:var(--text-muted);text-align:center}.filter-section{margin-bottom:22px;padding:16px;background:var(--bg-card);border-radius:12px;border:1px solid var(--border)}.filter-section h3{color:var(--text-secondary);font-size:.9rem;text-transform:uppercase;letter-spacing:.05em;margin-bottom:12px;font-weight:600}.filter-buttons{display:flex;gap:8px;flex-wrap:wrap}.filter-btn{padding:9px 18px;border:1px solid var(--border);background:var(--bg-elevated);border-radius:20px;cursor:pointer;transition:all .2s ease;font-size:1rem;color:var(--text-secondary);font-weight:500}.filter-btn:hover{background:var(--bg-hover);color:var(--text-primary);border-color:var(--accent)}.filter-btn.active{background:var(--accent);color:#0d0a00;border-color:var(--accent);font-weight:700}.minerals-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:18px;margin-top:20px}.mineral-card{background:var(--bg-card);padding:22px;border-radius:12px;border:1px solid var(--border);box-shadow:0 2px 8px #0003;transition:all .25s ease}.mineral-card:hover{transform:translateY(-4px);border-color:var(--accent);box-shadow:0 6px 20px #e6a81726}.mineral-card h3{color:var(--accent);font-size:1.45rem;margin-bottom:10px;font-weight:600}.mineral-info{margin:7px 0;font-size:1.05rem;line-height:1.6;color:var(--text-primary)}.mineral-info strong{color:var(--text-secondary);margin-right:5px}.tags{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}.tag{display:inline-block;padding:4px 12px;background:var(--accent-dim);border-radius:20px;font-size:.85rem;color:var(--accent);border:1px solid rgba(230,168,23,.25);font-weight:500}.tag.high{background:#f851491f;border-color:#f851494d;color:var(--error)}.quiz-question{background:var(--bg-card);padding:28px;border-radius:14px;margin-top:20px;border:1px solid var(--border);box-shadow:0 2px 12px #0003}.quiz-question h3{color:var(--text-secondary);margin-bottom:16px;font-size:1rem;font-weight:500;text-transform:uppercase;letter-spacing:.04em}.quiz-question p{font-size:1.3rem;color:var(--text-primary);line-height:1.6}.quiz-options{display:flex;flex-direction:column;gap:12px;margin-top:22px}.quiz-option{padding:18px 22px;background:var(--bg-elevated);border:1px solid var(--border);border-radius:10px;cursor:pointer;transition:all .2s ease;font-size:1.05rem;text-align:left;color:var(--text-primary)}.quiz-option:hover{background:var(--bg-hover);border-color:var(--accent);transform:translate(4px)}.quiz-option.correct{background:var(--success-bg);border-color:var(--success-border);color:var(--success);font-weight:600}.quiz-option.incorrect{background:var(--error-bg);border-color:var(--error-border);color:var(--error);font-weight:600}.explanation-box{margin-top:18px;padding:16px 20px;border-radius:10px;font-size:1.05rem;line-height:1.65}.explanation-box.correct{background:var(--success-bg);border:1px solid var(--success-border);color:var(--success)}.explanation-box.incorrect{background:var(--error-bg);border:1px solid var(--error-border);color:#ff9090}.explanation-box strong{display:block;margin-bottom:6px;font-size:1.05rem}.quiz-score-line{text-align:center;margin-top:18px;font-size:1.05rem;color:var(--text-secondary)}.result-screen{text-align:center;padding:32px 20px}.result-emoji{font-size:5rem;margin-bottom:18px;animation:bounce 1s ease infinite}.result-score{font-size:3.5rem;color:var(--accent);font-weight:800;margin:16px 0}.result-percent{font-size:1.4rem;color:var(--text-secondary);margin-bottom:28px}.result-review{text-align:left;margin-bottom:28px}.result-review h3{color:var(--text-primary);margin-bottom:14px;font-size:1.2rem}.result-item{padding:14px 18px;margin-bottom:10px;border-radius:10px;font-size:1rem}.result-item.correct{background:var(--success-bg);border:1px solid var(--success-border)}.result-item.incorrect{background:var(--error-bg);border:1px solid var(--error-border)}.result-item p:first-child{font-weight:600;margin-bottom:4px;color:var(--text-primary)}.result-item p:last-child{color:var(--text-secondary);font-size:.95rem}.navigator-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#000000bf;display:flex;justify-content:center;align-items:center;z-index:1000;padding:20px}.navigator-modal{background:var(--bg-elevated);border-radius:16px;padding:28px;max-width:680px;max-height:80vh;overflow:auto;width:100%;box-shadow:0 16px 48px #0009;border:1px solid var(--border)}.navigator-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.navigator-header h3{color:var(--text-primary);font-size:1.2rem}.navigator-close{background:none;border:none;font-size:1.4rem;cursor:pointer;color:var(--text-secondary);padding:4px 8px;border-radius:4px;transition:color .2s}.navigator-close:hover{color:var(--text-primary)}.navigator-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(52px,1fr));gap:8px}.navigator-btn{padding:12px 8px;border:1px solid var(--border);border-radius:8px;background:var(--bg-card);cursor:pointer;font-size:1rem;font-weight:500;color:var(--text-primary);transition:all .15s}.navigator-btn:hover{border-color:var(--accent);background:var(--accent-dim)}.navigator-btn.current{border:2px solid var(--accent);background:var(--accent-dim);color:var(--accent);font-weight:700}.navigator-btn.answered-correct{background:var(--success-bg);border-color:var(--success-border);color:var(--success)}.navigator-btn.answered-wrong{background:var(--error-bg);border-color:var(--error-border);color:var(--error)}.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;margin-bottom:28px}.stat-card{background:var(--bg-card);padding:22px;border-radius:12px;text-align:center;border:1px solid var(--border);transition:all .2s ease}.stat-card:hover{transform:translateY(-3px);border-color:var(--accent)}.stat-card h4{color:var(--text-secondary);font-size:1rem;text-transform:uppercase;letter-spacing:.05em;margin-bottom:10px;font-weight:500}.stat-card .value{font-size:2.6rem;font-weight:700;color:var(--accent)}.stat-card .value.success{color:var(--success)}.stat-card .value.warning{color:var(--warning)}.stat-card .value.info{color:var(--info)}.stat-card .value.error{color:var(--error)}.progress-section{margin-bottom:28px}.progress-section h3{color:var(--text-primary);font-size:1.15rem;margin-bottom:14px;font-weight:600}.progress-bar-large{width:100%;height:28px;background:var(--bg-elevated);border-radius:10px;overflow:hidden;border:1px solid var(--border-muted);position:relative}.progress-fill-large{height:100%;background:linear-gradient(90deg,var(--accent) 0%,var(--accent-hover) 100%);transition:width .5s ease;border-radius:10px;display:flex;align-items:center;justify-content:center;color:#0d0a00;font-weight:700;font-size:.95rem;min-width:40px}.section-title{font-size:1.15rem;font-weight:600;color:var(--text-primary);margin-bottom:14px;margin-top:28px;padding-bottom:8px;border-bottom:1px solid var(--border)}.mastered-list{display:flex;flex-wrap:wrap;gap:8px}.mastered-tag{padding:6px 14px;background:var(--success-bg);border:1px solid var(--success-border);border-radius:20px;font-size:.9rem;color:var(--success);font-weight:500}.card-counter{text-align:center;margin-top:14px;font-size:1rem;color:var(--text-secondary)}@media (max-width: 768px){.header h1{font-size:2rem}.mode-selector,.minerals-grid{grid-template-columns:1fr}.flashcard-front,.flashcard-back{min-height:420px;padding:28px 20px}.flashcard-front h2{font-size:2rem}.controls{flex-direction:column;align-items:center}.btn{width:100%;justify-content:center}.srs-buttons{gap:8px}.btn-again,.btn-hard,.btn-good,.btn-easy{flex:1;min-width:80px;justify-content:center;padding:12px 10px;font-size:1rem}}@keyframes fadeIn{0%{opacity:0;transform:translateY(14px)}to{opacity:1;transform:translateY(0)}}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(-16px)}}::-webkit-scrollbar{width:10px}::-webkit-scrollbar-track{background:var(--bg-secondary);border-radius:10px}::-webkit-scrollbar-thumb{background:var(--bg-elevated);border-radius:10px;border:2px solid var(--bg-secondary)}::-webkit-scrollbar-thumb:hover{background:var(--border)}