:root {
  --bg: #0d1117;
  --panel: #161b22;
  --panel-2: #1c2330;
  --border: #2d3748;
  --text: #e6edf3;
  --muted: #8b949e;
  --accent: #2ea043;
  --accent-hover: #3fb950;
  --danger: #f85149;
  --warn: #d29922;
  color-scheme: dark;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.55 ui-sans-serif, system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ---------- top bar ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 12px 20px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand { display: flex; align-items: center; gap: 12px; }
.logo { font-size: 28px; }
.brand h1 { margin: 0; font-size: 17px; }
.brand p { margin: 0; font-size: 12px; color: var(--muted); }
.brand a { color: var(--muted); }

.nav-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  padding: 7px 14px;
  cursor: pointer;
  font-size: 13px;
  margin-left: 6px;
}
.nav-btn:hover { border-color: var(--muted); }
.nav-btn.active { background: var(--accent); border-color: var(--accent); color: #fff; }

/* ---------- layout ---------- */
main { flex: 1; width: min(980px, 100%); margin: 0 auto; padding: 16px 20px; }
.view { display: flex; flex-direction: column; height: 100%; }
.hidden { display: none !important; }

/* ---------- chat ---------- */
.chat {
  flex: 1;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--panel);
  padding: 16px;
  min-height: 45vh;
}

.empty-state { text-align: center; padding: 8vh 20px; color: var(--muted); }
.empty-state h2 { color: var(--text); font-size: 19px; margin-bottom: 10px; }
.empty-state p { max-width: 620px; margin: 0 auto 20px; }

.msg { display: flex; flex-direction: column; margin-bottom: 14px; }
.msg .who {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--muted);
  margin-bottom: 4px;
}
.msg .bubble {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  border-radius: 10px;
  padding: 10px 14px;
  max-width: 92%;
}
.msg.user { align-items: flex-end; }
.msg.user .bubble { background: #1f6feb33; }
.msg.assistant .bubble { background: var(--panel-2); }
.msg.system .bubble { background: transparent; color: var(--muted); font-style: italic; max-width: 100%; }
.msg.assistant.streaming .bubble::after {
  content: "▌";
  color: var(--accent-hover);
  animation: blink 1s steps(1) infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* ---------- composer ---------- */
.composer {
  margin-top: 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--panel);
  padding: 10px;
}
.composer textarea {
  width: 100%;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  resize: vertical;
  font: inherit;
}
.composer textarea:disabled { opacity: .5; }
.composer-actions { display: flex; gap: 8px; justify-content: flex-end; margin-top: 8px; flex-wrap: wrap; }

/* ---------- buttons ---------- */
button { font: inherit; border-radius: 8px; cursor: pointer; transition: filter .15s; }
button:disabled { cursor: not-allowed; opacity: .45; }
button:not(:disabled):hover { filter: brightness(1.15); }

.primary  { background: var(--accent); border: 1px solid var(--accent); color: #fff; padding: 8px 16px; }
.secondary { background: transparent; border: 1px solid var(--accent); color: var(--accent-hover); padding: 8px 16px; }
.danger   { background: var(--danger); border: 1px solid var(--danger); color: #fff; padding: 8px 16px; }
.ghost    { background: transparent; border: 1px solid var(--border); color: var(--text); padding: 8px 14px; }

/* ---------- settings ---------- */
.settings, .report { max-width: 760px; }
.settings h2, .report h2 { margin-top: 6px; }
.settings label { display: block; margin: 16px 0 6px; font-size: 13px; font-weight: 600; }
.settings input[type="url"], .settings input[type="password"], .settings input[type="text"], .settings input[type="number"],
.settings textarea, .composer textarea {
  width: 100%;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px;
  font: inherit;
}
.grid-two { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 0 24px; }
.settings input[type="range"] { width: 100%; }
.settings-actions { display: flex; gap: 10px; margin-top: 20px; flex-wrap: wrap; }
.status { min-height: 1.5em; margin-top: 14px; font-size: 14px; }
.status.ok { color: var(--accent-hover); }
.status.err { color: var(--danger); }
.status.busy { color: var(--warn); }
.muted { color: var(--muted); }
code { background: var(--panel-2); border-radius: 4px; padding: 1px 5px; font-size: 13px; }

/* ---------- report ---------- */
.report table { border-collapse: collapse; width: 100%; margin: 8px 0 20px; font-size: 14px; }
.report th, .report td { border: 1px solid var(--border); padding: 7px 10px; text-align: left; }
.report th { background: var(--panel-2); }
.report h3 { margin: 22px 0 6px; }
.report pre { background: var(--panel-2); border: 1px solid var(--border); border-radius: 8px; padding: 12px; overflow-x: auto; }

footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 12px;
  text-align: center;
  padding: 10px 20px;
}
footer p { margin: 0; }

a { color: #58a6ff; }

@media (max-width: 720px) {
  .topbar { flex-direction: column; align-items: flex-start; }
  .msg .bubble { max-width: 100%; }
}