:root{color-scheme:dark;--bg:#0d121b;--panel:#151d29;--edge:#283444;--text:#e5edf8;--muted:#91a2b8;--cyan:#67d8f3;--gold:#ffd166;font-family:system-ui,-apple-system,"Segoe UI","Noto Sans JP",sans-serif}*{box-sizing:border-box}body{margin:0;background:radial-gradient(ellipse at 10% 0%,#182b3b 0,transparent 45%),var(--bg);color:var(--text);font-size:14px}header,main,footer{max-width:1440px;margin:auto;padding:24px 32px}header{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--edge)}.brand{display:flex;gap:14px;align-items:center}.brand img{border-radius:12px}h1{font-size:21px;letter-spacing:-.6px;margin:3px 0}a{color:var(--cyan);text-decoration:none}a:hover{text-decoration:underline}.eyebrow{font-size:10px;font-weight:700;letter-spacing:2px;color:var(--muted)}.intro{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:10px 0 26px}h2{font-size:27px;letter-spacing:.02em;margin:0 0 10px}.intro p{color:var(--muted);margin:0;line-height:1.8}#status{border:1px solid var(--edge);border-radius:30px;padding:8px 14px;color:var(--cyan);white-space:nowrap;font-size:12px}#status.error{color:#ff9f9f;white-space:normal}.workspace{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:20px}.panel{background:var(--panel);border:1px solid var(--edge);border-radius:16px;overflow:hidden}.panel-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:17px 22px}.panel-head h3{margin:0;font-size:14px}.view-controls{display:flex;align-items:center;gap:12px}.view-controls span{color:var(--muted);font-size:11px}.view-controls button{font-size:11px;padding:7px 10px}.simulation{grid-column:1;grid-row:1}canvas{display:block;width:100%}#board{height:370px;background:#101721}#chart{height:220px}.stats{display:grid;grid-template-columns:repeat(4,1fr);padding:20px 22px;gap:12px;border-top:1px solid var(--edge)}.stats span{display:block;font-size:11px;color:var(--muted);margin-bottom:6px}.stats strong{font-size:24px;font-weight:600;font-variant-numeric:tabular-nums}.stats small{font-size:11px;color:var(--muted);font-weight:400}.controls{grid-column:2;grid-row:1 / span 2}.controls fieldset{border:0;margin:0;padding:3px 22px 16px;min-width:0}button{font:inherit;color:var(--text);background:#202d3d;border:1px solid #35455a;border-radius:8px;padding:10px 14px;cursor:pointer;transition:background .15s}button:hover{background:#304256}button:disabled{opacity:.5;cursor:wait}button.primary{width:100%;background:var(--cyan);color:#092331;font-weight:700;border:0;padding:13px}button.primary:hover{background:#a0eafa}.button-row{display:flex;gap:8px;margin:10px 0 20px}.button-row button{flex:1}label{display:flex;align-items:center;justify-content:space-between;margin:21px 0 8px;font-size:12px}output{color:var(--cyan);font-variant-numeric:tabular-nums}input[type=range]{width:100%;accent-color:var(--cyan);cursor:pointer;margin:8px 0}input[type=checkbox]{accent-color:var(--cyan);width:18px;height:18px}.toggle{border-top:1px solid var(--edge);padding-top:17px}.hint{font-size:11px;line-height:1.7;color:var(--muted);margin:5px 0}.tip{margin:0 22px 22px;padding:16px;background:#1c2b38;border-radius:10px;font-size:12px;line-height:1.8}.tip p{color:var(--muted);margin:6px 0 0}.distribution{grid-column:1;grid-row:2}.distribution>.hint{padding:0 22px 16px}.legend{display:flex;gap:15px;font-size:11px;color:var(--cyan)}.legend span+span{color:var(--gold)}.explanation{display:grid;grid-template-columns:230px 1fr;gap:24px;padding:30px 8px 8px}.explanation h3{font-size:21px;margin:8px 0}.explanation p{color:var(--muted);line-height:1.95;font-size:13px;margin:0}footer{display:flex;justify-content:space-between;gap:15px;flex-wrap:wrap;border-top:1px solid var(--edge);color:var(--muted);font-size:11px;line-height:1.9}button:focus-visible,input:focus-visible,a:focus-visible{outline:2px solid var(--gold);outline-offset:4px}@media(max-width:950px){.workspace{grid-template-columns:minmax(0,1fr) 260px}.panel-head{padding:15px}.view-controls span{display:none}.stats{padding:16px}.stats strong{font-size:20px}#board{height:320px}}@media(max-width:720px){header,main,footer{padding:20px 16px}h1{font-size:17px}.eyebrow{font-size:9px}.intro{display:block}h2{font-size:23px}.intro p{font-size:12px}#status{display:inline-block;margin-top:15px}.workspace{display:flex;flex-direction:column}.simulation{order:0}.controls{order:2}.distribution{order:1}#board{height:250px}.stats{gap:8px;padding:14px}.stats span{font-size:10px}.stats strong{font-size:19px}.explanation{grid-template-columns:1fr;gap:12px}.legend{gap:8px;font-size:10px}footer{display:block}footer>span{display:block;margin-bottom:8px}}