:root{--bg: #04050d;--panel: #0e1120;--panel-2: #181d2e;--edge: #283150;--ink: #e8ecff;--muted: #8b97bf;--cyan: #9ff7ff;--gold: #ffd24a;--red: #ff5470;font-family:Segoe UI,system-ui,sans-serif}*{box-sizing:border-box}html,body{margin:0;height:100%}body{background:radial-gradient(900px 600px at 50% -10%,#101933 0%,var(--bg) 60%);color:var(--ink);display:flex;justify-content:center;-webkit-font-smoothing:antialiased;overflow:hidden}#app{width:min(480px,100vw);padding:8px 10px 14px;display:flex;flex-direction:column;height:100vh}.topbar{display:flex;align-items:center;gap:8px;margin-bottom:6px}.title{font-weight:900;letter-spacing:3px;font-size:20px}.title .k{color:var(--gold)}.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,border-color .15s}button:hover:not(:disabled){background:#222a44;border-color:#3a4670}button:active:not(:disabled){transform:translateY(1px)}button.primary{background:linear-gradient(180deg,#ffd24a,#e0a41c);border-color:#ffe79e;font-weight:700;color:#1a1206}.icon-btn{padding:6px 9px}.hud{display:flex;align-items:center;gap:12px;font-size:13px;color:var(--muted);margin-bottom:6px}.hud b{color:var(--ink)}.lives{color:var(--cyan);letter-spacing:2px}.chal{color:var(--gold);font-weight:800;letter-spacing:1px}.dual{color:var(--cyan);font-weight:800;letter-spacing:1px}.stage{position:relative;flex:1;min-height:0;display:flex;justify-content:center}canvas{display:block;height:100%;max-width:100%;border-radius:14px;background:#05071a;border:1px solid var(--edge);touch-action:none}.fire-btn{position:absolute;bottom:12px;right:12px;z-index:5;width:92px;height:92px;border-radius:50%;font-weight:800;font-size:13px;background:radial-gradient(circle at 50% 35%,#9ff7ff47,#9ff7ff14);border:2px solid var(--cyan);color:var(--cyan);user-select:none;touch-action:none;box-shadow:0 0 18px #9ff7ff40}.fire-btn.on{background:radial-gradient(circle at 50% 35%,#9ff7ff8c,#9ff7ff33)}.overlay{position:absolute;inset:0;background:#04050dd6;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(--gold)}.help-content{text-align:left;max-height:64vh;overflow-y:auto}.help-content h3{margin:12px 0 4px;color:var(--cyan);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)}