:root{--bg: #0b0b0f;--surface: #15151c;--surface-2: #1e1e27;--border: #2a2a36;--text: #e9e9f0;--muted: #8a8a9a;--accent: #5b8cff;--accent-soft: #223056;--bubble-me: #2f4fb0;--bubble-them: #22222c;--danger: #ff5b6e;--radius: 16px;--font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%;background:var(--bg);color:var(--text);font-family:var(--font);-webkit-font-smoothing:antialiased}button{font-family:inherit;cursor:pointer;border:none;border-radius:12px;transition:background .15s,transform .05s}button:active{transform:scale(.98)}input{font-family:inherit;background:var(--surface-2);border:1px solid var(--border);color:var(--text);border-radius:12px;padding:14px 16px;font-size:16px;width:100%;outline:none}input:focus{border-color:var(--accent)}.app{height:100%;display:flex;flex-direction:column;max-width:560px;margin:0 auto}.calc{height:100%;display:flex;flex-direction:column;justify-content:flex-end;padding:20px;gap:12px}.calc-display{text-align:right;font-size:56px;font-weight:300;padding:24px 12px;color:var(--text);min-height:110px;word-break:break-all}.calc-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.calc-key{aspect-ratio:1;border-radius:50%;font-size:26px;background:var(--surface-2);color:var(--text);display:flex;align-items:center;justify-content:center}.calc-key.op{background:var(--accent);color:#fff}.calc-key.fn{background:#33333f;color:var(--muted)}.screen{flex:1;display:flex;flex-direction:column;padding:20px;gap:16px;overflow-y:auto}.center{justify-content:center;align-items:center;text-align:center}.title{font-size:24px;font-weight:600}.subtitle{color:var(--muted);font-size:15px;line-height:1.5}.btn-primary{background:var(--accent);color:#fff;padding:15px;font-size:16px;font-weight:600;width:100%}.btn-ghost{background:var(--surface-2);color:var(--text);padding:15px;font-size:16px;width:100%}.btn-danger{background:transparent;color:var(--danger);padding:12px;font-size:14px}.code-box{font-size:34px;letter-spacing:4px;font-weight:700;background:var(--surface);border:1px dashed var(--border);border-radius:var(--radius);padding:24px;text-align:center}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px}.topbar{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--border)}.chat-item{display:flex;align-items:center;gap:14px;padding:14px 20px;border-bottom:1px solid var(--border)}.avatar{width:46px;height:46px;border-radius:50%;background:var(--accent-soft);display:flex;align-items:center;justify-content:center;font-weight:600;color:var(--accent)}.messages{flex:1;display:flex;flex-direction:column;gap:8px;padding:16px;overflow-y:auto}.bubble{max-width:78%;padding:10px 14px;border-radius:18px;font-size:15px;line-height:1.4;word-wrap:break-word}.bubble.me{align-self:flex-end;background:var(--bubble-me);border-bottom-right-radius:6px}.bubble.them{align-self:flex-start;background:var(--bubble-them);border-bottom-left-radius:6px}.meta{font-size:11px;color:var(--muted);margin-top:3px}.composer{display:flex;gap:10px;padding:12px 16px;border-top:1px solid var(--border);align-items:center}.composer input{flex:1}.icon-btn{width:44px;height:44px;border-radius:50%;background:var(--accent);color:#fff;font-size:20px;display:flex;align-items:center;justify-content:center;flex-shrink:0}.safety{font-size:12px;color:var(--muted);text-align:center;padding:8px;background:var(--surface);border-radius:10px}