:root {
  --ink: #14201c;
  --paper: #f3efe6;
  --panel: rgba(255, 252, 245, 0.88);
  --line: rgba(20, 32, 28, 0.12);
  --accent: #c45c26;
  --accent-deep: #8f3d12;
  --mint: #1f6f5b;
  --warn: #7a3b12;
  --warn-bg: #f6e2c8;
  --shadow: 0 18px 50px rgba(20, 32, 28, 0.12);
  --radius: 18px;
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Figtree", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  color: var(--ink);
  font-family: var(--font-body);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(31, 111, 91, 0.22), transparent 55%),
    radial-gradient(900px 500px at 100% 0%, rgba(196, 92, 38, 0.18), transparent 50%),
    linear-gradient(160deg, #e8e1d2 0%, #f3efe6 45%, #dfe8e3 100%);
  background-attachment: fixed;
}

.page-login {
  min-height: 100%;
  display: grid;
  place-items: center;
  padding: 2rem;
}
.login-shell {
  width: min(920px, 100%);
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2rem;
  align-items: stretch;
}
@media (max-width: 800px) {
  .login-shell { grid-template-columns: 1fr; }
}
.login-brand h1 {
  font-family: var(--font-display);
  font-size: clamp(3rem, 8vw, 4.5rem);
  margin: 0.2rem 0 0.6rem;
  letter-spacing: -0.03em;
}
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.75rem;
  color: var(--mint);
  font-weight: 600;
  margin: 0;
}
.lede { max-width: 28ch; opacity: 0.85; line-height: 1.5; }
.login-card, .chat-top, .sidebar, .thread-wrap, .banner-warn {
  background: var(--panel);
  backdrop-filter: blur(10px);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.login-card {
  border-radius: var(--radius);
  padding: 1.75rem;
  display: grid;
  gap: 1rem;
}
.login-card label {
  display: grid;
  gap: 0.35rem;
  font-size: 0.9rem;
  font-weight: 500;
}
.login-card input, .ctrl select, .composer textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.7rem 0.85rem;
  font: inherit;
  background: #fffdf8;
  color: var(--ink);
}
.form-error { color: var(--accent-deep); margin: 0; font-size: 0.9rem; }

.btn-primary, .btn-ghost {
  font: inherit;
  font-weight: 600;
  border-radius: 999px;
  padding: 0.7rem 1.15rem;
  cursor: pointer;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--ink);
  color: #f7f3ea;
}
.btn-primary:hover { background: var(--mint); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--ink);
}
.btn-ghost:hover { border-color: var(--mint); color: var(--mint); }

.page-chat { min-height: 100%; display: flex; flex-direction: column; }
.chat-top {
  margin: 1rem 1rem 0;
  border-radius: var(--radius);
  padding: 0.85rem 1.1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
  align-items: center;
  justify-content: space-between;
}
.brand {
  font-family: var(--font-display);
  font-size: 1.55rem;
  font-weight: 700;
  margin-right: 0.65rem;
}
.user-chip {
  font-size: 0.85rem;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  background: rgba(31, 111, 91, 0.12);
  color: var(--mint);
  font-weight: 600;
}
.controls { display: flex; flex-wrap: wrap; gap: 0.55rem; align-items: center; }
.ctrl {
  display: flex;
  gap: 0.4rem;
  align-items: center;
  font-size: 0.85rem;
  font-weight: 500;
}
.ctrl select { width: auto; min-width: 7rem; padding: 0.45rem 0.6rem; }
.inline-form { display: inline; margin: 0; }

.banner-warn {
  margin: 0.75rem 1rem 0;
  padding: 0.75rem 1rem;
  border-radius: 12px;
  background: var(--warn-bg);
  color: var(--warn);
  border-color: rgba(122, 59, 18, 0.2);
}
.banner-warn code { font-size: 0.9em; }

.chat-layout {
  flex: 1;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 1rem;
  padding: 1rem;
  min-height: 0;
}
@media (max-width: 860px) {
  .chat-layout { grid-template-columns: 1fr; }
  .sidebar { max-height: 160px; }
}
.sidebar, .thread-wrap {
  border-radius: var(--radius);
  min-height: 0;
}
.sidebar {
  padding: 1rem;
  overflow: auto;
}
.sidebar h2 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin: 0 0 0.75rem;
}
.conv-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.35rem; }
.conv-item {
  width: 100%;
  text-align: left;
  border: 1px solid transparent;
  background: transparent;
  border-radius: 10px;
  padding: 0.55rem 0.65rem;
  cursor: pointer;
  font: inherit;
  color: inherit;
}
.conv-item:hover, .conv-item.active {
  background: rgba(31, 111, 91, 0.1);
  border-color: rgba(31, 111, 91, 0.18);
}
.muted { opacity: 0.65; font-size: 0.9rem; }

.thread-wrap {
  display: flex;
  flex-direction: column;
  padding: 1rem;
}
.messages {
  flex: 1;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  padding-bottom: 0.75rem;
  min-height: 280px;
}
.bubble {
  max-width: min(720px, 92%);
  padding: 0.85rem 1rem;
  border-radius: 16px;
  line-height: 1.55;
  white-space: pre-wrap;
  word-break: break-word;
}
.bubble.user {
  align-self: flex-end;
  background: var(--ink);
  color: #f7f3ea;
  border-bottom-right-radius: 6px;
}
.bubble.assistant {
  align-self: flex-start;
  background: #fffdf8;
  border: 1px solid var(--line);
  border-bottom-left-radius: 6px;
}
.bubble.system {
  align-self: center;
  font-size: 0.85rem;
  opacity: 0.8;
  background: transparent;
  border: none;
  padding: 0.25rem;
}
.run-status {
  margin: 0 0 0.5rem;
  font-size: 0.85rem;
  color: var(--mint);
  font-weight: 600;
}
.composer {
  display: grid;
  gap: 0.65rem;
  border-top: 1px solid var(--line);
  padding-top: 0.85rem;
}
.composer-actions { display: flex; justify-content: flex-end; }