:root {
  color-scheme: light;
  --ink: #18212f;
  --muted: #6d7785;
  --line: #dfe4e8;
  --paper: #f7f8f6;
  --panel: #ffffff;
  --accent: #c94d32;
  --accent-dark: #9d3622;
  --user: #eaf0f3;
  --shadow: 0 20px 60px rgba(24, 33, 47, 0.09);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  color: var(--ink);
  background: radial-gradient(circle at 12% 0%, #fff8ed 0, transparent 32rem), var(--paper);
  font-family: Georgia, 'Times New Roman', serif;
}

button, textarea { font: inherit; }
button { cursor: pointer; }

.app-shell { min-height: 100vh; display: flex; flex-direction: column; }
.topbar { width: min(980px, calc(100% - 40px)); margin: 0 auto; padding: 26px 0 20px; display: flex; align-items: center; gap: 22px; }
.brand { color: var(--ink); display: inline-flex; align-items: center; gap: 10px; font-size: 18px; font-weight: 700; text-decoration: none; }
.brand-mark { color: var(--accent); font-size: 24px; line-height: 1; }
.connection { display: flex; align-items: center; gap: 8px; color: var(--muted); font: 12px/1.2 Arial, sans-serif; }
.model-picker { display: flex; align-items: center; gap: 8px; margin-left: auto; color: var(--muted); font: 11px Arial, sans-serif; }
.model-picker select { max-width: 180px; border: 1px solid var(--line); border-radius: 7px; color: var(--ink); background: rgba(255,255,255,.75); padding: 7px 25px 7px 9px; font: 12px Arial, sans-serif; }
.model-picker select:disabled { cursor: wait; opacity: .6; }
.status-dot { width: 7px; height: 7px; border-radius: 50%; background: #4a9b72; box-shadow: 0 0 0 4px rgba(74, 155, 114, .12); }
.status-dot.busy { background: var(--accent); animation: pulse 1.2s infinite; }
.status-dot.error { background: #b33131; }

.conversation { flex: 1; width: min(980px, calc(100% - 40px)); margin: 0 auto; overflow: auto; }
.conversation-inner { min-height: 100%; padding: 72px 0 38px; }
.welcome { max-width: 700px; padding: 8vh 0 10vh; animation: rise .5s ease both; }
.eyebrow { margin: 0 0 18px; color: var(--accent); font: 700 11px/1 Arial, sans-serif; letter-spacing: .12em; text-transform: uppercase; }
h1 { max-width: 650px; margin: 0; font-size: clamp(42px, 7vw, 76px); font-weight: 400; line-height: .98; letter-spacing: 0; }
.welcome-copy { max-width: 470px; margin: 25px 0 0; color: var(--muted); font-size: 18px; line-height: 1.5; }
.suggestions { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 35px; }
.suggestions button, .clear-button { border: 1px solid var(--line); border-radius: 999px; color: var(--ink); background: rgba(255,255,255,.65); padding: 9px 13px; font: 12px Arial, sans-serif; transition: border-color .2s, color .2s, transform .2s; }
.suggestions button:hover, .clear-button:hover { border-color: var(--accent); color: var(--accent-dark); transform: translateY(-1px); }

.message { display: flex; gap: 14px; max-width: 760px; margin: 0 0 27px; animation: rise .25s ease both; }
.message.user { margin-left: auto; flex-direction: row-reverse; }
.message-label { flex: 0 0 29px; width: 29px; height: 29px; border-radius: 50%; display: grid; place-items: center; color: #fff; background: var(--accent); font: 700 11px Arial, sans-serif; }
.message.assistant .message-label { color: var(--accent-dark); background: #f4d8ca; }
.message-body { max-width: 680px; padding-top: 5px; font-size: 17px; line-height: 1.55; white-space: pre-wrap; overflow-wrap: anywhere; }
.message.user .message-body { padding: 12px 16px; border-radius: 16px 4px 16px 16px; background: var(--user); }
.message.assistant .message-body { padding-right: 12px; }

.composer-area { width: min(980px, calc(100% - 40px)); margin: 0 auto; padding: 0 0 25px; }
.composer { border: 1px solid #cfd6db; border-radius: 16px; background: var(--panel); box-shadow: var(--shadow); padding: 14px 16px 11px; transition: border-color .2s, box-shadow .2s; }
.composer:focus-within { border-color: var(--accent); box-shadow: 0 20px 65px rgba(201, 77, 50, .13); }
textarea { display: block; width: 100%; min-height: 28px; max-height: 180px; resize: none; border: 0; outline: 0; color: var(--ink); background: transparent; font-size: 17px; line-height: 1.45; }
textarea::placeholder { color: #9ba3ab; }
.composer-footer { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 10px; }
.composer-hint, .footer-note { color: #929ba3; font: 11px Arial, sans-serif; }
.composer-actions { display: flex; align-items: center; gap: 10px; }
.send-button { display: inline-flex; align-items: center; gap: 10px; border: 0; border-radius: 8px; color: #fff; background: var(--accent); padding: 10px 14px; font: 700 12px Arial, sans-serif; transition: background .2s, opacity .2s; }
.send-button:hover { background: var(--accent-dark); }
.send-button:disabled { cursor: wait; opacity: .55; }
.error-message { margin: 12px 4px 0; color: #a02f2f; font: 12px/1.4 Arial, sans-serif; }
.footer-note { margin: 13px 3px 0; text-align: center; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }

@keyframes rise { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }
@keyframes pulse { 50% { opacity: .35; } }
@media (max-width: 600px) {
  .topbar, .conversation, .composer-area { width: min(100% - 28px, 980px); }
  .topbar { flex-wrap: wrap; padding-top: 18px; }
  .model-picker { order: 3; width: 100%; margin-left: 0; justify-content: space-between; }
  .model-picker select { flex: 1; max-width: none; }
  .conversation-inner { padding-top: 42px; }
  h1 { font-size: 48px; }
  .welcome-copy { font-size: 16px; }
  .composer-hint { display: none; }
  .composer-footer { justify-content: flex-end; }
  .message-body { font-size: 16px; }
}