@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700;900&family=JetBrains+Mono:wght@400;700&display=swap');
:root {
    --bg: #0a0e1a; --panel: rgba(15,20,35,0.92); --border: rgba(99,102,241,0.2);
    --text: #e2e8f0; --muted: #64748b; --accent: #818cf8; --cyan: #22d3ee;
    --emerald: #34d399; --rose: #fb7185; --amber: #fbbf24;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:'Inter',sans-serif;background:var(--bg);color:var(--text);overflow:hidden;height:100vh}
#canvas-container{position:fixed;inset:0;z-index:0}
#loading{position:fixed;inset:0;z-index:999;display:flex;flex-direction:column;align-items:center;justify-content:center;background:var(--bg);transition:opacity .5s}
#loading.hidden{opacity:0;pointer-events:none}
#loading h1{font-size:28px;font-weight:900;letter-spacing:4px;color:var(--accent);margin-bottom:8px}
#loading p{color:var(--muted);font-size:13px;margin-bottom:16px}
.loading-bar{width:200px;height:3px;background:rgba(99,102,241,.15);border-radius:2px;overflow:hidden}
.loading-bar-fill{height:100%;width:0;background:linear-gradient(90deg,var(--accent),var(--cyan));animation:sweep 1.2s ease-in-out infinite}
@keyframes sweep{0%{width:0}50%{width:70%}100%{width:100%}}

#top-bar{position:fixed;top:0;left:0;right:0;z-index:10;padding:10px 20px;
    display:flex;align-items:center;justify-content:space-between;
    background:var(--panel);backdrop-filter:blur(16px);border-bottom:1px solid var(--border)}
.logo{font-size:16px;font-weight:900;letter-spacing:2px;color:var(--accent)}
.top-controls{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--muted)}
.ctrl-select{background:rgba(99,102,241,.1);border:1px solid var(--border);color:var(--text);
    padding:6px 12px;border-radius:6px;font-family:'JetBrains Mono';font-size:14px;cursor:pointer}

#step-bar{position:fixed;bottom:0;left:0;right:0;z-index:10;padding:12px 20px;
    display:flex;align-items:center;justify-content:center;gap:16px;
    background:var(--panel);backdrop-filter:blur(16px);border-top:1px solid var(--border)}
.step-btn{padding:8px 18px;border-radius:8px;border:1px solid var(--border);
    background:rgba(99,102,241,.08);color:var(--text);font-size:13px;font-weight:600;
    cursor:pointer;transition:all .2s;font-family:'Inter'}
.step-btn:hover{background:rgba(99,102,241,.2);border-color:var(--accent)}
#step-label{font-family:'JetBrains Mono';font-size:14px;color:var(--cyan);font-weight:700;min-width:120px;text-align:center}

#info-panel{position:fixed;top:50px;right:12px;width:320px;z-index:10;
    background:var(--panel);backdrop-filter:blur(16px);border:1px solid var(--border);
    border-radius:12px;padding:16px;max-height:calc(100vh - 120px);overflow-y:auto}
#info-panel h2{font-size:15px;font-weight:700;color:var(--accent);margin-bottom:8px}
#info-panel p{font-size:12px;color:var(--muted);line-height:1.7;margin-bottom:8px}
#info-shape{font-family:'JetBrains Mono';font-size:11px;color:var(--cyan)}

::-webkit-scrollbar{width:4px}
::-webkit-scrollbar-thumb{background:rgba(99,102,241,.3);border-radius:2px}

/* Matrix overlay */
.matrix-overlay{position:fixed;inset:0;z-index:100;background:rgba(5,8,18,0.96);
    display:flex;flex-direction:column;overflow:hidden}
.matrix-overlay.hidden{display:none}
.overlay-header{padding:16px 24px;border-bottom:1px solid var(--border);flex-shrink:0;
    display:flex;align-items:center;gap:20px}
.overlay-header h2{font-size:18px;font-weight:800;color:var(--accent);white-space:nowrap}
.overlay-header p{font-size:12px;color:var(--muted);line-height:1.5;flex:1;white-space:pre-line}
.overlay-close{padding:6px 14px;border-radius:6px;border:1px solid var(--border);
    background:rgba(251,113,133,.1);color:var(--rose);font-size:12px;font-weight:600;
    cursor:pointer;white-space:nowrap;flex-shrink:0}
.overlay-close:hover{background:rgba(251,113,133,.25)}
.overlay-table-wrap{flex:1;overflow:auto;padding:12px}
.overlay-table-wrap table{border-collapse:collapse;font-family:'JetBrains Mono',monospace;font-size:12px}
.overlay-table-wrap th{padding:3px 8px;font-size:11px;color:var(--muted);font-weight:400;
    position:sticky;top:0;background:rgba(5,8,18,0.95);border-bottom:1px solid var(--border)}
.overlay-table-wrap th.row-header{position:sticky;left:0;background:rgba(5,8,18,0.95);
    border-right:1px solid var(--border);color:var(--amber);font-weight:700;font-size:13px;z-index:2}
.overlay-table-wrap th.corner{position:sticky;top:0;left:0;z-index:3;background:rgba(5,8,18,0.95)}
.overlay-table-wrap td{padding:3px 6px;text-align:right;border:1px solid rgba(99,102,241,0.06);
    white-space:nowrap}