:root{--bg: #05070f;--panel: rgba(10, 14, 26, .72);--panel-border: rgba(130, 160, 220, .14);--text: #9fb3c8;--text-bright: #e8eefc;--text-dim: #5c6b82;--accent: #54d0c8;--prime: #ffd27f;color-scheme:dark}*{box-sizing:border-box}html,body{margin:0;padding:0;width:100%;height:100%;overflow:hidden;background:var(--bg);overscroll-behavior:none;-webkit-user-select:none;user-select:none;-webkit-tap-highlight-color:transparent;font-family:ui-monospace,SF Mono,SFMono-Regular,Menlo,Consolas,monospace}canvas{position:fixed;inset:0;display:block}#gl{width:100%;height:100%;touch-action:none;cursor:grab}#gl.dragging{cursor:grabbing}#overlay{width:100%;height:100%;pointer-events:none}#progress{position:fixed;top:0;left:0;right:0;height:2px;background:transparent;z-index:10;opacity:0;transition:opacity .4s ease}#progress.active{opacity:.9}#progress-fill{height:100%;width:0%;background:linear-gradient(90deg,#54d0c8b3,#ffd27fcc);transition:width .2s linear}#readout{position:fixed;left:14px;bottom:14px;z-index:10;min-width:220px;padding:10px 12px;background:var(--panel);border:1px solid var(--panel-border);border-radius:10px;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);color:var(--text);font-size:12px;line-height:1.55;white-space:nowrap;pointer-events:none}#readout .row.primary{color:var(--prime);font-size:13px;letter-spacing:.02em}#readout .row.hint{color:var(--text-dim);min-height:1.55em}#readout .is-prime{color:var(--accent)}#readout .is-composite{color:var(--text-dim)}#controls{position:fixed;right:14px;bottom:14px;z-index:10;display:flex;flex-direction:column;gap:8px}#controls>button{width:42px;height:42px;border-radius:10px;border:1px solid var(--panel-border);background:var(--panel);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);color:var(--text-bright);font-size:19px;font-family:inherit;line-height:1;cursor:pointer;touch-action:manipulation;transition:background .15s ease,border-color .15s ease,transform .06s ease}#controls>button:hover{background:#161e34d9;border-color:#82a0dc4d}#controls>button:active{transform:scale(.94)}#settings-panel{position:absolute;right:0;bottom:calc(100% + 8px);width:196px;display:flex;flex-direction:column;gap:10px;padding:10px;background:var(--panel);border:1px solid var(--panel-border);border-radius:10px;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);color:var(--text);font-size:12px;visibility:hidden;opacity:0;transform:translateY(6px);pointer-events:none}#settings-panel.open{visibility:visible;opacity:1;transform:none;pointer-events:auto}.panel-head{display:flex;align-items:center;justify-content:space-between}.panel-title{color:var(--text-bright)}#btn-prime-reset{padding:0;border:0;background:none;font:inherit;font-size:11px;color:var(--text);cursor:pointer}#btn-prime-reset:hover{color:var(--text-bright)}#prime-swatches{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.swatch{width:100%;aspect-ratio:1;padding:0;border:1px solid var(--panel-border);border-radius:8px;background:var(--swatch);cursor:pointer;transition:filter .15s ease}.swatch:hover{filter:brightness(1.15)}.swatch[aria-pressed=true]{box-shadow:0 0 0 2px #0a0e1ae6,0 0 0 3px #e8eefce6}.panel-sep{height:1px;background:var(--panel-border)}#cell-shapes,#spiral-shapes,#spiral-directions,#number-options{display:grid;grid-template-columns:1fr 1fr;gap:8px}.shape-option{padding:6px 0;border:1px solid var(--panel-border);border-radius:8px;background:#161e3499;color:var(--text);font:inherit;font-size:11px;cursor:pointer;transition:background .15s ease,border-color .15s ease,color .15s ease}.shape-option:hover{color:var(--text-bright);border-color:#82a0dc4d}.shape-option[aria-pressed=true]{color:var(--accent);border-color:#54d0c88c;background:#54d0c81f}.custom-row{display:flex;align-items:center;justify-content:space-between;color:var(--text);font-size:11px;cursor:pointer}.custom-row input{width:44px;height:24px;padding:0;border:1px solid var(--panel-border);border-radius:6px;background:transparent;cursor:pointer}#controls>button:focus-visible,#settings-panel button:focus-visible,#settings-panel input:focus-visible{outline:2px solid var(--accent);outline-offset:2px}@media(prefers-reduced-motion:no-preference){#settings-panel{transition:opacity .15s ease,transform .15s ease,visibility 0s linear .15s}#settings-panel.open{transition:opacity .15s ease,transform .15s ease}}@media(max-height:620px){#settings-panel{bottom:0;right:calc(100% + 8px);transform:translate(6px)}#settings-panel.open{transform:none}}#legend{position:fixed;top:12px;right:14px;z-index:9;padding:8px 10px;background:var(--panel);border:1px solid var(--panel-border);border-radius:10px;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);color:var(--text-dim);font-size:11px;line-height:1.6;text-align:right;pointer-events:none;opacity:.85}@media(max-width:720px){#legend{display:none}#readout{min-width:0;max-width:calc(100vw - 90px)}}#fatal{position:fixed;inset:0;z-index:100;display:flex;align-items:center;justify-content:center;padding:24px;background:var(--bg);color:var(--text);font-size:14px;text-align:center;line-height:1.7}#fatal[hidden]{display:none}