:root{--bg: #f4f5f7;--panel: #ffffff;--ink: #1b1f24;--muted: #6b7280;--line: #aab1bb;--frame: #5b6370;--clue-bg: #2b2f36;--clue-ink: #eef0f3;--accent: #2f6f4f;--cell: 56px}*{box-sizing:border-box}html,body{height:100%}body{margin:0;font-family:Segoe UI,system-ui,-apple-system,Arial,sans-serif;background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased;overflow:hidden}.wrap{max-width:900px;margin:0 auto;padding:24px 16px 64px;height:100%;overflow-y:auto}.app-shell{height:var(--app-h, 100dvh);display:flex;flex-direction:column;padding:8px;overflow:hidden}.room,.game{display:flex;flex-direction:column;flex:1 1 auto;min-height:0;gap:8px}header h1{margin:0 0 4px;font-size:1.5rem}header p{margin:0 0 18px;color:var(--muted)}.board{position:relative;flex:1 1 auto;min-height:0;width:100%;display:flex;flex-direction:column;background:var(--panel);border-radius:14px;padding:8px;overflow:hidden;box-shadow:0 8px 30px 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