:root{--bg: #f4f0e7;--panel: #fffaf2;--ink: #1c1a19;--accent: #0f6b6d;--accent-2: #f18f01;--muted: #6d6864;--chat-font-scale: 1}*{box-sizing:border-box}body{margin:0;min-height:100vh;color:var(--ink);background:radial-gradient(circle at 15% 20%,#fff9,#fff0 40%),radial-gradient(circle at 80% 10%,#f18f0140,#f18f0100 50%),var(--bg);font-family:Avenir Next,Segoe UI,sans-serif;font-size:calc(18px * var(--chat-font-scale))}.app{width:min(980px,100%);margin:0 auto;min-height:100vh;display:grid;grid-template-rows:auto 1fr auto auto;gap:1rem;padding:1rem}.app-header{display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap}.brand{display:flex;align-items:center;gap:.9rem}.brand-logo{width:clamp(110px,14vw,170px);height:auto;display:block}.header-actions{display:flex;align-items:center;gap:.75rem;flex-wrap:wrap}.font-control-label{font-size:.86rem;color:var(--muted);font-weight:600}.font-control-input{width:7rem;padding:0}h1{margin:0;font-size:clamp(1.6rem,3vw,2.4rem)}.messages{background:var(--panel);border:2px solid #e7dfd3;border-radius:16px;padding:1rem;overflow-y:auto}.msg{max-width:80ch;margin:.7rem 0;padding:.75rem 1rem;border-radius:12px}.msg strong{display:block;margin-bottom:.2rem;font-size:.95rem}.msg p{margin:0;line-height:1.5;white-space:pre-wrap;font-size:1.05rem}.msg-user{margin-left:auto;background:#e3f1f1;border:1px solid #c4dede}.msg-assistant{margin-right:auto;background:#fff3df;border:1px solid #f1d5a0}.chat-form{display:grid;grid-template-columns:1fr auto;gap:.75rem}input,button{font:inherit;border-radius:10px;padding:1rem 1.1rem;border:1px solid #ccc4b8}button{background:var(--accent);color:#fff;border:none;font-weight:600;cursor:pointer}button.secondary{background:var(--accent-2);color:#2b2008}button:disabled{opacity:.6;cursor:not-allowed}.status-hint{margin:0;color:var(--muted);font-size:.9rem}@media (max-width: 700px){body{font-size:calc(16px * var(--chat-font-scale))}.chat-form{grid-template-columns:1fr}.msg{max-width:100%}.font-control-input{width:100%;min-width:8rem}}