:root{--accent: #ff6f0f;--bg: #f5f6f8;--surface: #ffffff;--ink: #1a1a1c;--muted: #8a8f98;--line: #e7e9ee;--radius: 16px;color-scheme:light}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{font-family:Pretendard,-apple-system,BlinkMacSystemFont,Apple SD Gothic Neo,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased}.app{max-width:980px;margin:0 auto;padding:40px 20px 32px;display:flex;flex-direction:column;gap:24px;min-height:100%}.app__hero{text-align:center}.app__title{font-size:2.4rem;font-weight:800;letter-spacing:-.02em;margin:0 0 8px}.app__dot{color:var(--accent)}.app__tagline{font-weight:600;margin:0 0 10px}.app__hint{color:var(--muted);font-size:.92rem;line-height:1.55;max-width:620px;margin:0 auto}.app__hint code{background:#fff0e6;color:var(--accent);padding:1px 6px;border-radius:6px;font-weight:700}.app__grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}@media(max-width:720px){.app__grid{grid-template-columns:1fr}}.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:0 1px 2px #1018280a;display:flex;flex-direction:column;height:460px;overflow:hidden}.panel__head{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;border-bottom:1px solid var(--line)}.panel__who{font-weight:700}.panel__who:before{content:"";display:inline-block;width:9px;height:9px;border-radius:50%;background:var(--accent);margin-right:8px;vertical-align:middle}.panel__meta{display:inline-flex;align-items:center;gap:10px;font-size:.78rem;color:var(--muted)}.status{display:inline-flex;align-items:center;gap:5px}.status__dot{width:7px;height:7px;border-radius:50%;background:var(--muted)}.status--open .status__dot{background:#1fb46b}.status--reconnecting .status__dot,.status--connecting .status__dot{background:#f0a020;animation:pulse 1s ease-in-out infinite}.status--closed .status__dot{background:#e5484d}@keyframes pulse{50%{opacity:.3}}.messages{flex:1;overflow-y:auto;padding:14px;display:flex;flex-direction:column;gap:8px;background:linear-gradient(#fafbfc,#fff)}.msg{display:flex;flex-direction:column;max-width:78%}.msg--mine{align-self:flex-end;align-items:flex-end}.msg--theirs{align-self:flex-start}.msg__name{font-size:.72rem;color:var(--muted);margin:0 0 2px 4px}.msg__bubble{padding:8px 12px;border-radius:14px;line-height:1.4;word-break:break-word;font-size:.92rem}.msg--theirs .msg__bubble{background:#eef0f3;border-bottom-left-radius:4px}.msg--mine .msg__bubble{background:var(--accent);color:#fff;border-bottom-right-radius:4px}.msg__meta{display:inline-flex;gap:6px;align-items:center;font-size:.68rem;color:var(--muted);margin-top:3px}.msg__read{color:var(--accent);font-weight:700}.typing{min-height:18px;padding:0 16px;font-size:.76rem;color:var(--muted)}.composer{display:flex;gap:8px;padding:12px;border-top:1px solid var(--line)}.composer__input{flex:1;border:1px solid var(--line);border-radius:999px;padding:10px 14px;font-size:.92rem;outline:none}.composer__input:focus{border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 18%,transparent)}.composer__send{border:none;background:var(--accent);color:#fff;font-weight:700;padding:0 18px;border-radius:999px;cursor:pointer}.composer__send:disabled{opacity:.4;cursor:not-allowed}.app__foot{text-align:center;color:var(--muted);font-size:.82rem}.app__foot a{color:var(--muted)}