:root{--bg-primary: #121214;--bg-surface: #18181b;--bg-card: #27272a;--border-color: rgba(255, 255, 255, .1);--text-main: #f4f4f5;--text-muted: #a1a1aa;--accent-amber: #eab308;--accent-blue: #3b82f6;--accent-green: #22c55e;--accent-red: #ef4444;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-display: "Fredoka", cursive, sans-serif;--font-mono: "JetBrains Mono", monospace}*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}body{background-color:var(--bg-primary);color:var(--text-main);font-family:var(--font-family);line-height:1.5;min-height:100vh}#app{display:flex;flex-direction:column;min-height:100vh}.site-header{background-color:var(--bg-surface);border-bottom:1px solid var(--border-color);position:sticky;top:0;z-index:50;padding:8px 16px}.header-inner{max-width:840px;margin:0 auto;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:8px}.brand-icon{font-size:1.8rem;line-height:1}.brand-text{display:flex;flex-direction:column}.brand-title{font-family:var(--font-display);font-size:1.25rem;font-weight:700;color:var(--accent-amber);line-height:1.1}.brand-badge{font-size:.65rem;font-weight:700;letter-spacing:1.2px;color:#60a5fa;background:#3b82f626;padding:1px 4px;border-radius:4px;align-self:flex-start}.sim-meta-stats{display:flex;align-items:center;gap:8px}.stat-pill{font-family:var(--font-mono);font-size:.78rem;font-weight:600;background:#00000059;border:1px solid rgba(255,255,255,.08);padding:3px 8px;border-radius:12px;color:#a1a1aa}.stat-pill span{color:#facc15}.header-actions{display:flex;align-items:center;gap:6px}.icon-btn{background:#ffffff0f;border:1px solid rgba(255,255,255,.1);color:var(--text-main);width:36px;height:36px;border-radius:50%;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s}.icon-btn:hover{background:#ffffff26;transform:translateY(-1px)}.main-content{flex:1;display:flex;flex-direction:column;align-items:center;padding:12px 16px 40px}.sandbox-wrapper{width:100%;max-width:800px;display:flex;flex-direction:column;align-items:center;gap:10px}.sim-controls-bar{width:100%;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px;background:var(--bg-surface);padding:8px 12px;border-radius:var(--radius-md);border:1px solid var(--border-color)}.controls-left,.controls-right{display:flex;align-items:center;gap:6px}.tool-btn{background:#ffffff0f;border:1px solid rgba(255,255,255,.12);color:var(--text-main);font-family:var(--font-family);font-size:.82rem;font-weight:600;padding:6px 12px;border-radius:var(--radius-sm);cursor:pointer;display:inline-flex;align-items:center;gap:4px;transition:all .2s}.tool-btn:hover{background:#ffffff24}.tool-btn.danger:hover{background:#ef444440;border-color:#ef4444;color:#fca5a5}.preset-label{font-size:.82rem;color:var(--text-muted);font-weight:600}.preset-select{background:#27272a;border:1px solid rgba(255,255,255,.15);color:#fff;font-family:var(--font-family);font-size:.82rem;font-weight:600;padding:6px 10px;border-radius:var(--radius-sm);cursor:pointer;outline:none}.preset-select:focus{border-color:var(--accent-amber)}.tool-btn.active-stream{background:#3b82f633;border-color:#3b82f680;color:#93c5fd}.streams-guide-bar{width:100%;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px;background:#18181bd9;border:1px solid rgba(255,255,255,.08);padding:6px 12px;border-radius:var(--radius-sm);font-size:.8rem}.streams-legend{display:flex;align-items:center;flex-wrap:wrap;gap:6px}.legend-badge{font-weight:700;color:var(--accent-amber)}.stream-pill{font-size:.72rem;font-weight:600;padding:2px 6px;border-radius:4px;background:#ffffff14;border:1px solid rgba(255,255,255,.12)}.stream-pill.stream-water{color:#60a5fa;border-color:#3b82f666}.stream-pill.stream-sand{color:#facc15;border-color:#eab30866}.stream-pill.stream-lava{color:#f87171;border-color:#ef444466}.stream-pill.stream-acid{color:#a3e635;border-color:#a3e63566}.stream-pill.stream-oil{color:#fbbf24;border-color:#d9770666}.streams-tip{color:#a1a1aa;font-size:.78rem}.streams-tip b{color:#fff}.canvas-container{position:relative;width:100%;max-width:800px;aspect-ratio:4 / 3;background:#121214;border-radius:var(--radius-lg);border:3px solid #27272a;box-shadow:0 12px 30px #000000b3,inset 0 2px 4px #ffffff0d;overflow:hidden;touch-action:none;cursor:crosshair}#sandbox-canvas{width:100%;height:100%;display:block;image-rendering:pixelated;image-rendering:crisp-edges}.canvas-cursor{position:absolute;pointer-events:none;border:1.5px solid rgba(255,255,255,.8);border-radius:50%;transform:translate(-50%,-50%);display:none;box-shadow:0 0 4px #000c}.palette-container{width:100%;display:flex;flex-direction:column;gap:8px;background:var(--bg-surface);padding:10px 14px;border-radius:var(--radius-md);border:1px solid var(--border-color)}.brush-selector{display:flex;align-items:center;gap:8px}.brush-label{font-size:.82rem;color:var(--text-muted);font-weight:600}.brush-radios{display:flex;gap:6px}.brush-btn{background:#ffffff0f;border:1px solid rgba(255,255,255,.1);color:var(--text-main);width:28px;height:28px;border-radius:var(--radius-sm);font-family:var(--font-mono);font-size:.78rem;font-weight:700;cursor:pointer;transition:all 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h1{font-family:var(--font-display);font-size:1.85rem;color:var(--accent-amber);margin-bottom:12px;line-height:1.25}.article-lead{font-size:1.05rem;line-height:1.6;color:#e4e4e7}.seo-section{background:var(--bg-surface);border:1px solid var(--border-color);border-radius:var(--radius-lg);padding:24px}.seo-section h2{font-family:var(--font-display);font-size:1.4rem;color:#facc15;margin-bottom:16px}.seo-section p{line-height:1.65;margin-bottom:14px}.table-responsive{overflow-x:auto;margin-top:14px}.reaction-table{width:100%;border-collapse:collapse;text-align:left;font-size:.9rem}.reaction-table th,.reaction-table td{padding:12px 14px;border-bottom:1px solid rgba(255,255,255,.08)}.reaction-table th{background:#0000004d;color:var(--accent-amber);font-weight:600}.reaction-table tr:hover td{background:#ffffff05}.experiments-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px;margin-top:16px}.exp-card{background:var(--bg-card);padding:16px;border-radius:var(--radius-md);border:1px solid rgba(255,255,255,.06)}.exp-num{display:inline-block;width:26px;height:26px;line-height:26px;text-align:center;background:var(--accent-amber);color:#18181b;font-weight:700;border-radius:50%;margin-bottom:10px}.exp-card h3{font-size:1.05rem;color:#fff;margin-bottom:6px}.exp-card p{font-size:.88rem;color:var(--text-muted);margin-bottom:0}.science-points{padding-left:20px;display:flex;flex-direction:column;gap:10px}.science-points li strong{color:#fff}.faq-accordion{display:flex;flex-direction:column;gap:12px;margin-top:16px}.faq-item{background:var(--bg-card);border-radius:var(--radius-md);border:1px solid rgba(255,255,255,.06);overflow:hidden}.faq-question{padding:14px 18px;font-size:1rem;font-weight:600;color:#fff;cursor:pointer;-webkit-user-select:none;user-select:none;list-style:none;position:relative}.faq-question::-webkit-details-marker{display:none}.faq-question:after{content:"+";position:absolute;right:18px;font-size:1.2rem;color:var(--accent-amber)}details[open] .faq-question:after{content:"−"}.faq-answer{padding:0 18px 16px;font-size:.92rem;color:var(--text-muted);line-height:1.6}.seo-footer{border-top:1px solid var(--border-color);padding-top:28px}.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px;margin-bottom:24px}.footer-col h4{font-size:.95rem;color:#facc15;margin-bottom:8px}.footer-col p{font-size:.85rem;color:var(--text-muted);line-height:1.5}.sister-links{list-style:none}.sister-links a{color:#60a5fa;text-decoration:none;font-size:.9rem;display:inline-block;padding:4px 0;transition:color .2s}.sister-links a:hover{color:#93c5fd;text-decoration:underline}.footer-bottom{text-align:center;font-size:.8rem;color:#71717a;border-top:1px solid rgba(255,255,255,.05);padding-top:16px}.modal-backdrop{position:fixed;top:0;right:0;bottom:0;left:0;background:#000000bf;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:100;padding:20px}.modal-backdrop[hidden]{display:none}.modal-card{background:var(--bg-surface);border:1px solid rgba(255,255,255,.15);border-radius:var(--radius-lg);max-width:440px;width:100%;padding:24px;box-shadow:0 20px 40px #0009;text-align:center;animation:modalEnter .25s cubic-bezier(.34,1.56,.64,1)}@keyframes modalEnter{0%{opacity:0;transform:scale(.92)}to{opacity:1;transform:scale(1)}}.modal-icon{font-size:2.2rem;display:inline-block;margin-bottom:8px}.modal-header h2{font-family:var(--font-display);font-size:1.4rem;color:#fff;margin-bottom:12px}.help-points{text-align:left;padding-left:20px;display:flex;flex-direction:column;gap:10px;font-size:.92rem;margin-bottom:20px}.action-btn{background:var(--accent-amber);color:#18181b;font-family:var(--font-family);font-size:.95rem;font-weight:700;padding:10px 20px;border-radius:var(--radius-md);border:none;cursor:pointer;width:100%}