:root{--bg: #0e1116;--panel: #181d25;--line: #2a323d;--ink: #eef3f7;--dim: #93a4b3;--accent: #d2603a;--good: #46c98a;--bad: #d84a4a}*{box-sizing:border-box}html,body{margin:0;height:100%}body{background:radial-gradient(900px 560px at 50% -8%,#221814,var(--bg));color:var(--ink);font-family:system-ui,-apple-system,Segoe UI,sans-serif;display:flex;justify-content:center;-webkit-user-select:none;user-select:none}#app{width:100%;max-width:520px;padding:12px 12px 26px}header{text-align:center;margin-bottom:6px}h1{margin:0;font-size:28px;letter-spacing:6px;font-weight:800;color:var(--accent)}.sub{margin:3px 0 0;color:var(--dim);font-size:13px}.bar{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;align-items:center;margin:10px 0}.seg{display:inline-flex;background:var(--panel);border:1px solid var(--line);border-radius:999px;overflow:hidden}.seg button{background:none;border:none;color:var(--dim);padding:6px 13px;font:600 13px system-ui;cursor:pointer}.seg button.active{background:var(--accent);color:#1a0d07}.btn{background:var(--panel);border:1px solid var(--line);color:var(--ink);padding:7px 14px;border-radius:999px;font:700 13px system-ui;cursor:pointer}.btn:hover{border-color:var(--accent)}.btn.primary{background:var(--accent);color:#1a0d07;border-color:var(--accent)}.scoreboard{display:flex;gap:10px;justify-content:center;margin:8px 0}.readout{background:#0a0e13;border:1px solid var(--line);border-radius:8px;padding:5px 16px;font:800 18px ui-monospace,monospace;color:var(--accent);min-width:92px;text-align:center}.readout span{color:var(--dim);font-size:11px;display:block;font-weight:600;letter-spacing:.5px}.stage{display:flex;justify-content:center}.door{width:min(94vw,460px);background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:18px 16px 16px;text-align:center;box-shadow:inset 0 0 40px #d2603a0d}.eq{font:800 clamp(26px,9vw,44px) ui-monospace,"SF Mono",monospace;letter-spacing:2px;margin:6px 0 14px;color:var(--ink);min-height:50px;display:flex;align-items:center;justify-content:center}.chargebar{height:10px;background:#0a0e13;border:1px solid var(--line);border-radius:999px;overflow:hidden;margin:0 0 8px}.chargefill{height:100%;width:100%;background:var(--accent);transition:width .1s linear}.answer{font:800 28px ui-monospace,monospace;color:var(--accent);min-height:36px;letter-spacing:2px;margin:4px 0 10px}.keypad{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.key{background:#0a0e13;border:1px solid var(--line);color:var(--ink);font:700 22px ui-monospace,monospace;padding:14px 0;border-radius:10px;cursor:pointer}.key:hover{border-color:var(--accent)}.key.fn{font-size:16px}.key.fn.ok{background:var(--accent);color:#1a0d07;border-color:var(--accent)}.key.op{font-size:28px}.msg{min-height:22px;margin-top:12px;font:700 15px system-ui}.msg.good{color:var(--good)}.msg.bad{color:var(--bad)}