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var(--border);background:#fff;border-radius:var(--radius-sm);padding:10px 20px;font-weight:700;cursor:pointer;font-family:inherit;font-size:.95rem}.btn.primary{background:var(--primary);border-color:var(--primary);color:#fff}.btn.primary:hover{background:var(--primary-dark)}.btn-primary{background:var(--accent);border-color:var(--accent);color:#241c05;display:inline-block;text-decoration:none}.btn-primary:hover{background:var(--accent-dark);color:#fff;text-decoration:none}.btn-ghost{background:transparent;border:1.5px solid hsla(0,0%,100%,.55);color:#fff;border-radius:var(--radius-sm);padding:12px 26px;font-weight:800;font-size:1rem}.btn-ghost:hover{background:hsla(0,0%,100%,.1);text-decoration:none}.sim-readout{display:flex;gap:18px;flex-wrap:wrap;background:#eef6f5;border-radius:var(--radius-sm);padding:12px 16px;font-size:.95rem}.sim-readout b{color:var(--surface)}.site-footer{background:var(--surface);color:#d3e8e7;margin-top:60px}.site-footer .wrap{padding-top:44px;padding-bottom:30px}.foot-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));grid-gap:26px;gap:26px}.foot-grid h4{color:#fff;margin:0 0 12px;font-size:.95rem}.foot-grid ul{list-style:none;margin:0;padding:0}.foot-grid li{margin:7px 0;font-size:.92rem}.foot-grid a{color:#d3e8e7}.foot-bottom{border-top:1px solid hsla(0,0%,100%,.12);margin-top:30px;padding-top:20px;font-size:.85rem;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}.katex-display{margin:0}.equation .katex{color:#fff;font-size:1.35em}.badge-new{background:var(--green);color:#fff;font-size:.7rem;font-weight:800;padding:3px 9px;border-radius:999px;text-transform:uppercase;letter-spacing:.06em}table.data{width:100%;border-collapse:collapse;margin:16px 0;font-size:.95rem}table.data td,table.data th{border:1px solid var(--border);padding:10px 12px;text-align:left}table.data th{background:var(--primary-soft)}.skip{position:absolute;left:-9999px}.skip:focus{left:12px;top:12px;background:#fff;padding:10px 16px;z-index:100;border-radius:8px}@media (max-width:720px){body{font-size:16px}.main-nav{display:none}.calc-row{grid-template-columns:1fr}.hero{padding:44px 0 40px}}@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}.game-msg{min-height:1.6em;font-weight:600;color:var(--surface)}.game-over{text-align:center;padding:32px 20px;display:grid;grid-gap:12px;gap:12px;justify-items:center}.game-over h3{margin:0}.game-pick{display:flex;gap:8px;flex-wrap:wrap;align-items:center;font-weight:600;font-size:.9rem}.chip{border:2px solid #cbd5e1;background:#fff;border-radius:999px;padding:6px 14px;font-weight:700;cursor:pointer;font-size:.9rem}.chip.on{border-color:var(--primary);background:#eef6f5;color:var(--surface)}.mem-grid{display:grid;grid-template-columns:repeat(4,1fr);grid-gap:10px;gap:10px;padding:18px 22px}.mem-card{aspect-ratio:1.4;border-radius:var(--radius-sm);border:2px solid #cbd5e1;background:#123a45;color:#fff;font-weight:700;font-size:.85rem;cursor:pointer;padding:8px;display:grid;place-items:center;text-align:center}.mem-card.open{background:#fff;color:var(--surface);border-color:var(--primary)}.mem-card.done{background:#ecfdf5;border-color:#22c55e;color:var(--surface);cursor:default}.quiz-opts{display:grid;grid-gap:8px;gap:8px}.exp-steps{grid-gap:14px;margin:18px 0}.exp-step,.exp-steps{display:grid;gap:14px}.exp-step{grid-template-columns:40px 1fr;grid-gap:14px;align-items:start}.exp-num{width:40px;height:40px;border-radius:50%;background:var(--primary-dark);color:#fff;display:grid;place-items:center;font-weight:800}.safety-box{background:#fef3c7;border-left:4px solid #c9a227;padding:14px 18px;border-radius:var(--radius-sm);margin:18px 0}.check-list{display:grid;grid-gap:14px;gap:14px;margin:18px 0}.check-item{background:#fff;border:1px solid #e2e8f0;border-radius:var(--radius-sm);padding:16px 18px}.check-item h3{margin:0 0 8px}.check-item ul{margin:0;padding-left:20px;display:grid;grid-gap:6px;gap:6px}