:root {
  color-scheme: light dark;
  --bg: #f6f5f1;
  --surface: #ffffff;
  --surface-2: #efece5;
  --border: #d8d3c7;
  --text: #1c1d1a;
  --muted: #6b6a63;
  --accent: #2b3a2a;
  --accent-ink: #ffffff;
  --danger: #a3341f;
  --shadow: 0 1px 0 rgba(0,0,0,0.03);
  --radius: 6px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171a;
    --surface: #1c2024;
    --surface-2: #1a1d20;
    --border: #2c3237;
    --text: #e4e1d7;
    --muted: #9a978d;
    --accent: #d5c896;
    --accent-ink: #1a1d20;
    --danger: #d68471;
    --shadow: 0 1px 0 rgba(0,0,0,0.4);
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  line-height: 1.55;
}

.app { min-height: 100vh; display: grid; grid-template-rows: auto 1fr; }
.app[data-view="login"] .view-login { display: grid; }
.app[data-view="login"] .view-chat,
.app[data-view="login"] .view-loading { display: none; }
.app[data-view="chat"] .view-chat { display: grid; }
.app[data-view="chat"] .view-login,
.app[data-view="chat"] .view-loading { display: none; }
.app[data-view="loading"] .view-loading { display: grid; }
.app[data-view="loading"] .view-login,
.app[data-view="loading"] .view-chat { display: none; }

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; }
.brand-mark {
  width: 26px; height: 26px; border-radius: 4px;
  background: var(--accent); color: var(--accent-ink);
  display: inline-flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 14px;
}
.brand-text { font-weight: 600; }
.topbar-status { display: inline-flex; align-items: center; gap: 8px; }
.pill {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 3px 10px; border: 1px solid var(--border); border-radius: 999px;
  color: var(--muted); font-family: var(--mono); font-size: 12px;
}

button, .primary, .ghost {
  font: inherit; cursor: pointer;
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  padding: 8px 14px; border-radius: var(--radius);
}
button.primary {
  background: var(--accent); color: var(--accent-ink); border-color: transparent;
}
button.primary:disabled { opacity: 0.55; cursor: not-allowed; }
button.ghost { background: transparent; }
button.small { padding: 4px 10px; font-size: 12px; }

.view-loading { place-items: center; padding: 60px; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.error { color: var(--danger); margin-top: 8px; }

.view-login { place-items: center; padding: 60px 20px; }
.login-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px; width: 100%; max-width: 380px;
}
.login-card h1 { margin: 0 0 8px; font-size: 20px; }
.login-card form { display: grid; gap: 14px; margin-top: 20px; }
.login-card label { display: grid; gap: 6px; }
.login-card input {
  padding: 10px 12px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--bg); color: var(--text); font-family: var(--mono); font-size: 14px;
}

.view-chat {
  grid-template-columns: 260px 1fr; min-height: 0;
}
@media (max-width: 720px) {
  .view-chat { grid-template-columns: 1fr; }
  .chat-side { border-right: 0; border-bottom: 1px solid var(--border); }
}

.chat-side {
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 18px 16px;
  display: flex; flex-direction: column; gap: 18px;
  overflow-y: auto;
}
.side-block { display: grid; gap: 6px; }
.side-label { font-size: 11px; color: var(--muted); text-transform: uppercase; font-family: var(--mono); }
.chat-side select,
.chat-side input {
  padding: 8px 10px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--bg); color: var(--text); font-family: var(--mono); font-size: 13px;
}

.audit-list { margin: 0; padding: 0; list-style: none; display: grid; gap: 6px; }
.audit-list li {
  padding: 6px 8px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface-2); font-family: var(--mono); font-size: 12px; color: var(--muted);
}
.audit-list li.status-ok { border-color: transparent; }
.audit-list li.status-adapter_error,
.audit-list li.status-rate_limited,
.audit-list li.status-quota_exceeded,
.audit-list li.status-login_failed { color: var(--danger); }

.chat-main { display: grid; grid-template-rows: 1fr auto; min-height: 0; }
.messages {
  margin: 0; padding: 20px; list-style: none; overflow-y: auto;
  display: grid; gap: 14px;
}
.messages li {
  padding: 12px 14px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface);
  white-space: pre-wrap; word-wrap: break-word;
}
.messages li.user { background: var(--surface-2); }
.messages li.assistant.pending { color: var(--muted); font-style: italic; }
.messages li.assistant.error { color: var(--danger); }
.msg-meta {
  font-family: var(--mono); font-size: 11px; color: var(--muted);
  display: flex; gap: 10px; margin-bottom: 6px;
}

.composer {
  padding: 12px 16px; border-top: 1px solid var(--border); background: var(--surface);
  display: grid; gap: 8px;
}
.composer textarea {
  width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--bg); color: var(--text); font-family: var(--sans); font-size: 14px;
  resize: vertical; min-height: 60px; max-height: 220px;
}
.composer-row { display: flex; align-items: center; justify-content: space-between; }