:root,
:root[data-theme="dark"] {
  --bg: #0b0b0e;
  --panel: #15151a;
  --panel-2: #1d1d24;
  --text: #f4f0e8;
  --muted: #9b9aa3;
  --accent: #c9a96e;
  --accent-2: #e6c98a;
  --border: #2a2a33;
  --user: #2a2a36;
  --bot: #1f1f27;
  --on-accent: #1a1208;
  --body-gradient: radial-gradient(1200px 600px at 80% -10%, #1a1620 0%, var(--bg) 60%);
  --shadow-card: 0 20px 60px rgba(0, 0, 0, 0.5);
  --shadow-panel: 0 8px 30px rgba(0, 0, 0, 0.35);
  --err-bg: rgba(255, 100, 100, 0.08);
  --err-border: rgba(255, 100, 100, 0.3);
  --err-text: #ff9d9d;
}

:root[data-theme="ivory"] {
  --bg: #f7f1e7;
  --panel: #fbf6ec;
  --panel-2: #f1e9d8;
  --text: #2b231a;
  --muted: #7a6a55;
  --accent: #b8954c;
  --accent-2: #d4ad63;
  --border: #e1d4ba;
  --user: #ece1c8;
  --bot: #fbf6ec;
  --on-accent: #20180c;
  --body-gradient: radial-gradient(1200px 600px at 80% -10%, #fffaf0 0%, var(--bg) 60%);
  --shadow-card: 0 14px 40px rgba(120, 95, 50, 0.12);
  --shadow-panel: 0 8px 24px rgba(120, 95, 50, 0.1);
  --err-bg: rgba(180, 50, 50, 0.06);
  --err-border: rgba(180, 50, 50, 0.3);
  --err-text: #a3342b;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--body-gradient);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  min-height: 100vh;
}

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 24px; border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 12px; }
.logo {
  width: 36px; height: 36px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--on-accent); font-weight: 700; display: grid; place-items: center;
  font-family: Georgia, serif;
}
.brand-name { font-weight: 600; letter-spacing: .04em; }
.status { color: var(--muted); font-size: 13px; }
.status.ok { color: #8fd19e; }
.status.err { color: #ff8a8a; }

.shell { max-width: 820px; margin: 32px auto; padding: 0 16px; }
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
  box-shadow: 0 8px 30px rgba(0,0,0,.35);
}

.label { display: block; font-size: 12px; color: var(--muted); margin-bottom: 6px; }
.select {
  width: 100%;
  background: var(--panel-2); color: var(--text);
  border: 1px solid var(--border); border-radius: 10px;
  padding: 10px 12px; margin-bottom: 16px;
}

.chat {
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px;
  height: 50vh; min-height: 320px;
  overflow-y: auto;
  display: flex; flex-direction: column; gap: 10px;
}
.msg {
  max-width: 80%;
  padding: 10px 12px; border-radius: 12px;
  line-height: 1.45; font-size: 15px; white-space: pre-wrap; word-wrap: break-word;
}
.msg.user { align-self: flex-end; background: var(--user); }
.msg.bot  { align-self: flex-start; background: var(--bot); border: 1px solid var(--border); }
.msg.bot.typing { color: var(--muted); font-style: italic; }

.composer { display: flex; gap: 8px; margin-top: 14px; }
.input {
  flex: 1; background: var(--panel-2); color: var(--text);
  border: 1px solid var(--border); border-radius: 10px;
  padding: 12px 14px; font-size: 15px;
}
.input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }

.btn {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--on-accent); border: 0; border-radius: 10px;
  padding: 0 16px; font-weight: 600; cursor: pointer;
}
.btn:disabled { opacity: .6; cursor: not-allowed; }
.btn.ghost {
  background: transparent; color: var(--text);
  border: 1px solid var(--border);
}

.footnote { color: var(--muted); font-size: 12px; margin: 14px 2px 0; }

/* ---- Theme toggle (segmented control) ---- */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px;
  font-size: 12px;
  line-height: 1;
}
.theme-toggle button {
  background: transparent;
  color: var(--muted);
  border: 0;
  border-radius: 999px;
  padding: 6px 12px;
  cursor: pointer;
  font: inherit;
  letter-spacing: 0.02em;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.theme-toggle button:hover { color: var(--text); }
.theme-toggle button[aria-pressed="true"] {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--on-accent);
  font-weight: 600;
}
.theme-toggle .theme-ico { font-size: 13px; line-height: 1; }

/* On the login card, top-right corner */
.auth-card { position: relative; }
.auth-card .theme-toggle {
  position: absolute;
  top: 14px;
  right: 14px;
}
@media (max-width: 480px) {
  .auth-card .theme-toggle { top: 10px; right: 10px; }
  .theme-toggle button { padding: 5px 9px; font-size: 11px; }
}