*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}:root{--bg: #09090b;--surface: #18181b;--text: #fafafa;--text-muted: #a1a1aa;--accent: #8b5cf6;--font-body: "Inter", system-ui, sans-serif;--font-mono: "JetBrains Mono", monospace}html,body{height:100%;font-family:var(--font-body);background:var(--bg);color:var(--text);overflow:hidden}#app{width:100vw;height:100vh;position:relative}#canvas{display:block;width:100%;height:100%}#crosshair{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);pointer-events:none;z-index:10}.ch-h{width:20px;height:2px;background:#ffffffd9;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.ch-v{width:2px;height:20px;background:#ffffffd9;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}#hud{position:absolute;top:0;left:0;width:100%;padding:12px 16px;pointer-events:none;z-index:10;display:flex;flex-direction:column;align-items:center;gap:8px}#hud-top{width:100%;display:flex;justify-content:space-between;font-size:12px;color:#ffffffbf}.mono{font-family:var(--font-mono)}#block-bar{display:flex;gap:6px}.block-slot{width:40px;height:40px;border:2px solid rgba(255,255,255,.3);border-radius:6px;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:600;color:#ffffffb3;background:#00000073;cursor:pointer;pointer-events:all;transition:border-color .15s,background .15s;user-select:none}.block-slot.selected{border-color:var(--accent);background:#8b5cf640;color:#fff}#hint{font-size:12px;color:#ffffff80;background:#00000059;padding:4px 10px;border-radius:4px}#hint kbd{background:#ffffff26;border:1px solid rgba(255,255,255,.2);border-radius:3px;padding:1px 5px;font-family:var(--font-mono);font-size:11px}#help{position:absolute;inset:0;background:#0009;display:flex;align-items:center;justify-content:center;z-index:20;backdrop-filter:blur(4px)}#help.hidden{display:none}.help-panel{background:#18181bf5;border:1px solid rgba(139,92,246,.4);border-radius:12px;padding:32px 40px;min-width:340px;max-width:480px}.help-panel h2{font-size:20px;font-weight:700;color:var(--accent);margin-bottom:20px}.help-panel ul{list-style:none;display:flex;flex-direction:column;gap:10px;margin-bottom:20px}.help-panel li{font-size:14px;color:#ffffffd9;display:flex;gap:10px;align-items:center}.help-panel kbd{background:#8b5cf633;border:1px solid rgba(139,92,246,.4);border-radius:4px;padding:2px 7px;font-family:var(--font-mono);font-size:12px;color:#c4b5fd;white-space:nowrap}.help-footer{font-size:11px;color:var(--text-muted);margin-bottom:16px;font-family:var(--font-mono)}#help-close{background:var(--accent);color:#fff;border:none;border-radius:6px;padding:8px 20px;font-size:14px;font-weight:600;cursor:pointer;transition:opacity .15s}#help-close:hover{opacity:.85}