:root {
  --bg0: #14110e;
  --bg1: #1c1814;
  --bg2: #26201a;
  --line: rgba(232, 214, 184, 0.14);
  --ink: #f3ebe0;
  --muted: #a89886;
  --accent: #d4a35c;
  --accent-2: #6f9e8a;
  --user: #2a332c;
  --bot: #221c17;
  --danger: #c45c4a;
  --radius: 14px;
  --font: "Noto Sans SC", "DM Sans", system-ui, sans-serif;
  --display: "DM Sans", "Noto Sans SC", sans-serif;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(900px 500px at 0% 0%, #2a2218 0%, transparent 55%),
    radial-gradient(700px 420px at 100% 10%, #1a2a24 0%, transparent 50%),
    var(--bg0);
}

.app {
  display: grid;
  grid-template-columns: 300px 1fr;
  min-height: 100%;
  max-width: 1280px;
  margin: 0 auto;
}

.rail {
  padding: 28px 20px 20px;
  border-right: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg1) 88%, transparent);
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-height: 100vh;
  position: sticky;
  top: 0;
}

.brand-mark {
  margin: 0;
  font-family: var(--display);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.72rem;
  color: var(--accent);
}
.brand h1 {
  margin: 6px 0 4px;
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.brand-sub { margin: 0; color: var(--muted); font-size: 0.85rem; }

.field { display: grid; gap: 6px; font-size: 0.8rem; color: var(--muted); }
.field select,
.field textarea,
.composer textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--bg2);
  color: var(--ink);
  border-radius: 10px;
  padding: 10px 12px;
  font: inherit;
  resize: vertical;
}
.field select:focus,
.field textarea:focus,
.composer textarea:focus {
  outline: 2px solid color-mix(in srgb, var(--accent) 55%, transparent);
  outline-offset: 1px;
}

.agents { display: grid; gap: 8px; flex: 1; align-content: start; }
.agent-btn {
  text-align: left;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  border-radius: 12px;
  padding: 12px 12px 10px;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
.agent-btn:hover { border-color: color-mix(in srgb, var(--accent) 45%, var(--line)); }
.agent-btn.active {
  background: color-mix(in srgb, var(--accent) 14%, var(--bg2));
  border-color: color-mix(in srgb, var(--accent) 55%, var(--line));
}
.agent-btn strong { display: block; font-size: 0.92rem; margin-bottom: 2px; }
.agent-btn span { color: var(--muted); font-size: 0.75rem; line-height: 1.35; }

.rail-foot { font-size: 0.78rem; color: var(--muted); display: grid; gap: 4px; }
.rail-foot #quotaText { color: var(--accent-2); }

.stage {
  display: grid;
  grid-template-rows: auto 1fr auto;
  min-height: 100vh;
  min-width: 0;
}

.stage-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
  padding: 24px 28px 12px;
  border-bottom: 1px solid var(--line);
}
.eyebrow {
  margin: 0;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}
.stage-head h2 { margin: 4px 0 6px; font-size: 1.35rem; }
.muted { color: var(--muted); margin: 0; font-size: 0.88rem; }

.ghost {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  border-radius: 999px;
  padding: 8px 14px;
  cursor: pointer;
  font: inherit;
}
.ghost:hover { color: var(--ink); }

.thread {
  overflow: auto;
  padding: 22px 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.bubble {
  max-width: min(720px, 92%);
  padding: 12px 14px;
  border-radius: var(--radius);
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-word;
  border: 1px solid var(--line);
}
.bubble.user {
  align-self: flex-end;
  background: var(--user);
  border-bottom-right-radius: 4px;
}
.bubble.bot {
  align-self: flex-start;
  background: var(--bot);
  border-bottom-left-radius: 4px;
}
.bubble .meta {
  display: block;
  font-size: 0.72rem;
  color: var(--muted);
  margin-bottom: 6px;
}
.bubble.system {
  align-self: center;
  max-width: 560px;
  background: transparent;
  color: var(--muted);
  border-style: dashed;
  font-size: 0.85rem;
  text-align: center;
}
.bubble.error { border-color: color-mix(in srgb, var(--danger) 50%, var(--line)); color: #f0c4bc; }

.composer {
  padding: 12px 28px 22px;
  border-top: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg1) 75%, transparent);
  backdrop-filter: blur(8px);
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 10px; }
.chip {
  border: 1px solid var(--line);
  background: var(--bg2);
  color: var(--muted);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 0.78rem;
  cursor: pointer;
}
.chip:hover { color: var(--ink); border-color: var(--accent); }
.composer-row { display: grid; grid-template-columns: 1fr auto; gap: 10px; align-items: end; }
#sendBtn {
  border: 0;
  background: var(--accent);
  color: #1a140e;
  font-weight: 700;
  border-radius: 12px;
  padding: 12px 20px;
  cursor: pointer;
  font: inherit;
  min-height: 48px;
}
#sendBtn:disabled { opacity: 0.5; cursor: wait; }

.whoami {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--bg2);
}
.whoami p { margin: 0; font-size: 0.9rem; }

.login-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}
.login-card {
  width: min(420px, 100%);
  padding: 28px 24px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: color-mix(in srgb, var(--bg1) 92%, transparent);
}
.login-card h1 { margin: 8px 0 6px; font-size: 1.6rem; }
.login-card .field { margin-top: 14px; }
.login-card input {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--bg2);
  color: var(--ink);
  border-radius: 10px;
  padding: 12px;
  font: inherit;
}
.login-card button[type="submit"] {
  margin-top: 18px;
  width: 100%;
  border: 0;
  background: var(--accent);
  color: #1a140e;
  font-weight: 700;
  border-radius: 12px;
  padding: 12px;
  font: inherit;
  cursor: pointer;
}
.err { color: #f0c4bc; font-size: 0.88rem; margin: 10px 0 0; }

@media (max-width: 860px) {
  .app { grid-template-columns: 1fr; }
  .rail {
    position: static;
    min-height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .agents {
    grid-template-columns: 1fr 1fr;
  }
  .stage-head, .thread, .composer { padding-left: 16px; padding-right: 16px; }
}