:root{color-scheme:dark;--bg: #0b0e1a;--panel: #161b2e;--line: #2a3350;--text: #e8ecf8;--muted: #97a1c4;--accent: #6ea8ff;--danger: #ff8b8b}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,sans-serif;line-height:1.5}main{max-width:1040px;margin:0 auto;padding:24px 16px 48px}h1{font-size:1.6rem;margin:0 0 4px}h2{font-size:1.15rem;margin:0 0 12px}form[data-testid=auth-panel]{display:flex;flex-direction:column;gap:4px;max-width:420px;margin:32px auto;padding:24px;background:var(--panel);border:1px solid var(--line);border-radius:12px}form[data-testid=auth-panel] label{display:flex;flex-direction:column;gap:4px;margin-top:12px;font-weight:600}input{padding:10px 12px;font:inherit;font-weight:400;color:var(--text);background:#0f1424;border:1px solid var(--line);border-radius:8px}input:focus-visible{outline:2px solid var(--accent);outline-offset:1px}input[aria-invalid=true]{border-color:var(--danger)}small{color:var(--muted);font-size:.85rem}button{padding:10px 14px;font:inherit;font-weight:600;color:#0b0e1a;background:var(--accent);border:0;border-radius:8px;cursor:pointer}button[data-testid=toggle-mode],button[data-testid=logout]{color:var(--text);background:transparent;border:1px solid var(--line)}button:disabled{opacity:.6;cursor:progress}form[data-testid=auth-panel] button{margin-top:16px}[role=alert]{margin:6px 0 0;color:var(--danger);font-size:.9rem}header{display:flex;flex-wrap:wrap;align-items:baseline;gap:12px;margin-bottom:12px}header p{margin:0;color:var(--muted)}[data-testid=game-canvas] canvas{display:block;max-width:100%;border:1px solid var(--line);border-radius:12px}section{margin-top:20px}[data-testid=presence-list],[data-testid=chat-feed]{margin:0;padding-left:18px}[data-testid=chat-feed]{max-height:180px;overflow-y:auto}form:not([data-testid=auth-panel]){display:flex;gap:8px;margin-top:10px}form:not([data-testid=auth-panel]) input{flex:1}