:root{font-family:Segoe UI,Noto Sans TC,Microsoft JhengHei,sans-serif;color:#e8f4ee;background:#061015;font-synthesis:none;--mint:#45edca;--lime:#deff88;--muted:#92a8ab;--border:#294149;--panel:#10252d}*{box-sizing:border-box}html,body{margin:0;width:100%;height:100%;overflow:hidden}body{background:radial-gradient(ellipse at 50% 40%,#163c43 0,#0c232c 32%,#061116 70%);overscroll-behavior:none}body:before{content:"";position:fixed;inset:0;pointer-events:none;opacity:.12;background:repeating-linear-gradient(120deg,transparent 0 89px,#719796 90px,transparent 91px)}button,select{font:inherit}button{cursor:pointer;touch-action:manipulation;color:inherit;border:0}button:focus-visible,select:focus-visible,#arena-host:focus-visible{outline:2px solid var(--lime);outline-offset:3px}button:disabled{cursor:default}button:active:not(:disabled){transform:translateY(1px)}[hidden]{display:none!important}#app{position:relative;height:100vh;height:100dvh;max-width:560px;margin:auto;padding:max(8px,env(safe-area-inset-top)) max(14px,env(safe-area-inset-right)) max(6px,env(safe-area-inset-bottom)) max(14px,env(safe-area-inset-left));display:flex;flex-direction:column;gap:8px}header{height:46px;flex:none;display:flex;align-items:center;justify-content:space-between;gap:8px}.brand{display:flex;align-items:center;gap:7px;font-size:15px;font-weight:800;letter-spacing:.2px;white-space:nowrap}.brand-mark{color:var(--mint);font-size:28px}.settings{display:flex;gap:5px;align-items:center}select{color:#d1e0dc;background:#142c33;border:1px solid #31494e;border-radius:7px;height:36px;max-width:110px;font-size:12px;padding:0 6px}.icon-button{width:36px;height:36px;background:transparent;border:1px solid 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