:root{--bg: #07140c;--panel: #0e2418;--panel-2: #173a26;--edge: #245a3c;--ink: #eafff2;--muted: #8fc4a6;--accent: #4ee08a;--warn: #ffcf4d;--danger: #ff6b6b;font-family:Segoe UI,system-ui,sans-serif}*{box-sizing:border-box}html,body{margin:0;height:100%}body{background:radial-gradient(800px 500px at 50% -10%,#103a24 0%,var(--bg) 60%);color:var(--ink);display:flex;justify-content:center;-webkit-font-smoothing:antialiased;overflow:hidden}#app{width:min(560px,100vw);height:100vh;padding:8px 8px 12px;display:flex;flex-direction:column}.topbar{display:flex;align-items:center;gap:8px;margin-bottom:6px}.title{font-weight:800;letter-spacing:.4px;font-size:18px}.title .k{color:var(--accent)}.spacer{flex:1}button{font:inherit;cursor:pointer;color:var(--ink);background:var(--panel-2);border:1px solid var(--edge);border-radius:9px;padding:6px 10px;transition:transform .06s,background .15s}button:hover:not(:disabled){background:#1f4a31}button:active:not(:disabled){transform:translateY(1px)}button.primary{background:linear-gradient(180deg,#5cf09a,#2bbd6c);border-color:#86f5b6;color:#04230f;font-weight:700}.icon-btn{padding:6px 9px}.seg{display:inline-flex;border:1px solid var(--edge);border-radius:9px;overflow:hidden}.seg button{border:0;border-radius:0;padding:6px 11px;font-size:13px;background:transparent}.seg button.on{background:var(--panel-2);color:#fff;font-weight:700}.seg button+button{border-left:1px solid var(--edge)}.hud{display:flex;align-items:center;gap:14px;font-size:13px;color:var(--muted);margin-bottom:6px;flex-wrap:wrap}.hud .score{font-size:22px;font-weight:800;color:var(--ink)}.hud b{color:var(--accent)}.hud .lives{color:var(--danger);letter-spacing:2px;font-size:16px}.timebar{flex:1;min-width:90px;height:10px;border-radius:6px;background:#0c2417;border:1px solid var(--edge);overflow:hidden}.timebar>i{display:block;height:100%;background:linear-gradient(90deg,var(--accent),var(--warn));transition:width .1s linear}.timebar.low>i{background:var(--danger)}.stage{position:relative;flex:1;min-height:0;display:flex;justify-content:center}canvas{display:block;height:100%;max-width:100%;border-radius:14px;border:1px solid var(--edge);background:#0a2616;touch-action:none}.overlay{position:absolute;inset:0;background:#040c08d6;backdrop-filter:blur(3px);display:flex;align-items:center;justify-content:center;z-index:20;border-radius:14px}.modal{background:var(--panel);border:1px solid var(--edge);border-radius:16px;padding:20px;width:min(400px,90%);text-align:center;box-shadow:0 10px 30px #00000080}.modal h2{margin:0 0 6px}.modal p{color:var(--muted);margin:0 0 12px;font-size:14px}.modal .row{display:flex;gap:8px;justify-content:center;margin-top:14px;flex-wrap:wrap}.stat-line{color:var(--muted);font-size:14px;margin:3px 0}.stat-line b{color:var(--accent)}.help-content{text-align:left;max-height:62vh;overflow-y:auto}.help-content h3{margin:12px 0 4px;color:var(--accent);font-size:14px}.help-content p,.help-content li{color:var(--muted);font-size:13px;line-height:1.5}.help-content ul{margin:4px 0;padding-left:18px}.help-content b{color:var(--ink)}.hint{text-align:center;color:var(--muted);font-size:12px;margin-top:6px}.hint b{color:var(--ink)}.surge-meter{display:inline-flex;align-items:center;gap:5px}.surge-pip{width:12px;height:12px;border-radius:50%;border:1px solid var(--edge);background:#0c2417}.surge-pip.on{background:radial-gradient(circle at 35% 35%,#aef0ff,#38b6ff);border-color:#8fe2ff;box-shadow:0 0 6px #50c8ffb3}