:root {
  --bg0: #0e1110;
  --bg1: #161b19;
  --bg2: #1e2623;
  --line: #2c3732;
  --text: #e8eee9;
  --muted: #8a9a92;
  --accent: #c8f560;
  --accent-dim: #9bbb3a;
  --danger: #ff7b72;
  --ok: #6ee7a8;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --display: "Syne", system-ui, sans-serif;
  --radius: 10px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(1200px 600px at 10% -10%, #1a2a22 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #1c2218 0%, transparent 50%),
    var(--bg0);
  color: var(--text);
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.45;
}

/* —— Login —— */
.page-login {
  display: grid;
  place-items: center;
  min-height: 100vh;
  padding: 24px;
}

.login-shell {
  width: min(400px, 100%);
  padding: 32px 28px;
  background: linear-gradient(160deg, var(--bg1), var(--bg2));
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 4px);
  animation: rise 0.45s ease-out;
}

.login-brand { margin-bottom: 28px; }

.brand-mark {
  font-family: var(--display);
  font-weight: 700;
  font-size: 2rem;
  letter-spacing: -0.03em;
  margin: 0;
  color: var(--accent);
}

.brand-host {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.login-form label {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 0.8rem;
}

.login-form input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg0);
  color: var(--text);
  font: inherit;
  margin-bottom: 14px;
}

.login-form input:focus,
.chat-controls select:focus,
.chat-controls input:focus,
.composer textarea:focus {
  outline: 2px solid color-mix(in srgb, var(--accent) 55%, transparent);
  border-color: var(--accent-dim);
}

.login-form button,
.composer button[type="submit"] {
  width: 100%;
  padding: 12px 16px;
  border: 0;
  border-radius: var(--radius);
  background: var(--accent);
  color: #121510;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, filter 0.15s ease;
}

.login-form button:hover,
.composer button[type="submit"]:hover {
  filter: brightness(1.05);
  transform: translateY(-1px);
}

.form-error {
  color: var(--danger);
  margin: 0 0 12px;
  font-size: 0.85rem;
}

/* —— Chat shell —— */
.page-chat {
  min-height: 100vh;
  display: grid;
  grid-template-rows: auto 1fr auto;
}

.chat-top {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg1) 88%, transparent);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 2;
}

.chat-brand {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.chat-brand .brand-mark {
  font-size: 1.35rem;
}

.chat-brand .brand-host {
  margin: 0;
  font-size: 0.75rem;
}

.chat-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: end;
}

.ctrl {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.7rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.ctrl select,
.ctrl input {
  min-width: 140px;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--bg0);
  color: var(--text);
  font: inherit;
  text-transform: none;
  letter-spacing: 0;
}

.btn-ghost {
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: transparent;
  color: var(--text);
  font: inherit;
  cursor: pointer;
}

.btn-ghost:hover { border-color: var(--accent-dim); color: var(--accent); }

.logout-form { margin: 0; }

.messages {
  padding: 20px 18px 12px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: 920px;
  width: 100%;
  margin: 0 auto;
}

.msg {
  max-width: 100%;
  padding: 12px 14px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--bg1);
  animation: rise 0.28s ease-out;
  white-space: pre-wrap;
  word-break: break-word;
}

.msg.user {
  align-self: flex-end;
  background: #1a2620;
  border-color: #314038;
}

.msg.assistant { align-self: stretch; }

.msg .role {
  display: block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
  margin-bottom: 6px;
}

.msg.assistant .role { color: var(--accent-dim); }

.tool-block {
  margin-top: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: var(--bg0);
}

.tool-block summary {
  cursor: pointer;
  padding: 8px 10px;
  font-size: 0.8rem;
  color: var(--ok);
  list-style: none;
}

.tool-block summary::-webkit-details-marker { display: none; }

.tool-block summary::before {
  content: "▸ ";
  color: var(--muted);
}

.tool-block[open] summary::before { content: "▾ "; }

.tool-block pre {
  margin: 0;
  padding: 10px;
  border-top: 1px solid var(--line);
  font-size: 0.75rem;
  color: var(--muted);
  overflow-x: auto;
  max-height: 280px;
}

.composer {
  border-top: 1px solid var(--line);
  background: var(--bg1);
  padding: 14px 18px 18px;
}

.composer form {
  max-width: 920px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: end;
}

.composer textarea {
  width: 100%;
  resize: vertical;
  min-height: 56px;
  max-height: 180px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg0);
  color: var(--text);
  font: inherit;
}

.composer button[type="submit"] {
  width: auto;
  min-width: 96px;
}

.composer button[type="submit"]:disabled {
  opacity: 0.55;
  cursor: wait;
  transform: none;
}

.status {
  max-width: 920px;
  margin: 8px auto 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.status.error { color: var(--danger); }

.empty-hint {
  color: var(--muted);
  text-align: center;
  margin: 48px 12px;
  animation: fade 0.5s ease;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fade {
  from { opacity: 0; }
  to { opacity: 1; }
}

@media (max-width: 720px) {
  .composer form { grid-template-columns: 1fr; }
  .chat-controls { width: 100%; }
  .ctrl select, .ctrl input { min-width: 0; width: 100%; }
}