:root{--brand:#10b981;--ink:#0f172a;--muted:#475569;--bg:#ffffff;--bubble:#f8fafc;--radius:14px}
*{box-sizing:border-box}html,body{margin:0;height:100%;font-family:Inter,system-ui,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:var(--ink)}
.chat-header{position:sticky;top:0;z-index:10;background:#fff;border-bottom:1px solid #e5e7eb;display:flex;align-items:center;justify-content:space-between;padding:10px 14px}
.logo{display:flex;gap:10px;align-items:center;text-decoration:none;color:inherit;font-weight:800}
.logo img{width:30px;height:30px;border-radius:8px}.header-actions{display:flex;gap:10px;align-items:center}
.pill{padding:8px 12px;border-radius:999px;background:var(--brand);color:#fff;text-decoration:none;font-weight:700}
.icon-btn{font-size:18px;border:1px solid #cbd5e1;border-radius:10px;background:#fff;padding:6px 10px;cursor:pointer}
.chat-main{height:calc(100dvh - 140px);overflow:auto;padding:14px}.messages{display:flex;flex-direction:column;gap:10px;max-width:920px;margin:0 auto}
.msg{display:flex;gap:10px}.msg .avatar{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;font-weight:800}
.msg.user .avatar{background:#e2e8f0;color:#0f172a}.msg.ai .avatar{background:var(--brand);color:#fff}
.bubble{background:var(--bubble);border:1px solid #e5e7eb;border-radius:14px;padding:10px 12px;max-width:78%}
.msg.user .bubble{margin-left:auto;background:#e7f9f2;border-color:#bbf7d0}.msg.ai .bubble{margin-right:auto}
.chat-input{position:sticky;bottom:0;background:#fff;border-top:1px solid #e5e7eb;padding:10px 14px}
.input-wrap{max-width:920px;margin:0 auto;display:flex;gap:8px}#txt{flex:1;border:1.5px solid #cbd5e1;border-radius:12px;padding:12px 14px;font-size:16px}
.send,.mic{border:0;background:var(--brand);color:#fff;border-radius:12px;padding:0 14px;font-weight:800}.mic{display:grid;place-items:center}
.hint{display:block;max-width:920px;margin:6px auto 0;color:var(--muted)}@media (max-width:640px){.bubble{max-width:88%}}