:root{color-scheme:light;--bg: #f4f1ec;--panel: #fffdf8;--ink: #1f2428;--muted: #65706c;--line: #d8d2c7;--user: #143f64;--assistant: #e8f0e9;--accent: #247060;--accent-strong: #174d43;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:linear-gradient(135deg,rgba(36,112,96,.12),transparent 32%),linear-gradient(315deg,rgba(180,77,57,.1),transparent 35%),var(--bg);color:var(--ink)}button,textarea{font:inherit}.shell{min-height:100vh;display:grid;place-items:center;padding:clamp(14px,3vw,32px)}.chat{width:min(940px,100%);height:min(760px,calc(100vh - 28px));min-height:520px;display:grid;grid-template-rows:auto 1fr auto;overflow:hidden;border:1px solid var(--line);border-radius:8px;background:#fffdf8f0;box-shadow:0 24px 80px #1f242829}.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 20px;border-bottom:1px solid var(--line);background:var(--panel)}h1{margin:0;font-size:1.1rem;line-height:1.2}.topbar p{margin:4px 0 0;color:var(--muted);font-size:.88rem}.icon-button,.composer button{width:42px;height:42px;display:grid;place-items:center;flex:0 0 auto;border:1px solid transparent;border-radius:999px;cursor:pointer}.icon-button{background:#f2eee6;color:var(--ink);font-size:1.45rem}.messages{overflow-y:auto;padding:22px 20px;display:flex;flex-direction:column;gap:14px}.message{max-width:min(76ch,86%);padding:12px 14px;border-radius:8px;line-height:1.45;white-space:pre-wrap;overflow-wrap:anywhere}.message.user{align-self:flex-end;color:#fff;background:var(--user)}.message.assistant{align-self:flex-start;background:var(--assistant);border:1px solid #cfddcf}.message.system{align-self:center;color:var(--muted);background:transparent;border:1px dashed var(--line);font-size:.92rem}.composer{display:flex;align-items:flex-end;gap:10px;padding:14px;border-top:1px solid var(--line);background:var(--panel)}textarea{width:100%;max-height:180px;min-height:46px;resize:none;border:1px solid var(--line);border-radius:8px;padding:12px 14px;background:#fff;color:var(--ink);outline:none}textarea:focus{border-color:var(--accent);box-shadow:0 0 0 3px #24706029}.composer button{background:var(--accent);color:#fff;font-size:1.35rem}.composer button:disabled{cursor:wait;opacity:.62}@media(max-width:640px){.shell{padding:0}.chat{height:100vh;min-height:100vh;border:0;border-radius:0}.message{max-width:94%}}