:root {
  color-scheme: dark;
  --bg: #0f172a;
  --panel: #111827;
  --panel-2: #172033;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --accent: #38bdf8;
  --ok: #22c55e;
  --warn: #f59e0b;
  --bad: #f87171;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; background: var(--bg); color: var(--text); }
button, textarea, select { font: inherit; }

.split-shell {
  display: grid;
  grid-template-columns: minmax(420px, 1fr) minmax(420px, 1fr);
  height: 100vh;
  width: 100vw;
}

.chat-pane, .browser-pane {
  min-width: 0;
  min-height: 0;
  display: flex;
  flex-direction: column;
  background: var(--panel);
}

.chat-pane { border-right: 1px solid rgba(148, 163, 184, 0.22); padding: 18px; gap: 14px; }
.browser-pane { background: #020617; }

.pane-header, .session-bar, .chat-form, .status-grid article {
  background: var(--panel-2);
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 16px;
  padding: 14px;
}

.pane-header { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.pane-header h1, .pane-header h2 { margin: 0; font-size: 1.15rem; }
.eyebrow { margin: 0 0 4px; color: var(--accent); font-size: 0.75rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; }

button, #open-vnc {
  border: 0;
  border-radius: 999px;
  background: var(--accent);
  color: #03121f;
  cursor: pointer;
  font-weight: 800;
  padding: 10px 14px;
  text-decoration: none;
}

.session-bar { display: grid; grid-template-columns: auto 1fr; align-items: center; gap: 10px; }
select, textarea {
  width: 100%;
  border: 1px solid rgba(148, 163, 184, 0.28);
  border-radius: 12px;
  background: #020617;
  color: var(--text);
  padding: 10px;
}

.messages {
  flex: 1 1 30%;
  min-height: 180px;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-right: 4px;
}

.message {
  border-radius: 14px;
  padding: 12px;
  max-width: 92%;
  background: #1f2937;
  border: 1px solid rgba(148, 163, 184, 0.16);
  white-space: pre-wrap;
}
.message.user { align-self: flex-end; background: #075985; }
.message.worker, .message.assistant { align-self: flex-start; }
.message .meta { display:block; color: var(--muted); font-size: 0.72rem; margin-bottom: 4px; text-transform: uppercase; letter-spacing: .05em; }

.chat-form { display: flex; flex-direction: column; gap: 10px; }
.status-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; min-height: 180px; }
.status-grid article { min-width: 0; overflow: hidden; }
.status-grid h2 { font-size: 0.85rem; margin: 0 0 8px; color: var(--muted); }
.compact-list { display: flex; flex-direction: column; gap: 8px; max-height: 150px; overflow: auto; font-size: 0.78rem; }
.compact-card { background: #020617; border: 1px solid rgba(148, 163, 184, 0.16); border-radius: 10px; padding: 8px; overflow-wrap: anywhere; }
.status-completed { color: var(--ok); }
.status-started, .status-queued { color: var(--warn); }
.status-failed { color: var(--bad); }

.browser-header { margin: 18px 18px 12px; flex: 0 0 auto; }
#vnc-frame { width: calc(100% - 36px); height: calc(100% - 112px); margin: 0 18px 18px; border: 1px solid rgba(148, 163, 184, 0.25); border-radius: 16px; background: #000; }

@media (max-width: 900px) {
  .split-shell { grid-template-columns: 1fr; grid-template-rows: 1fr 1fr; }
  .chat-pane { border-right: 0; border-bottom: 1px solid rgba(148, 163, 184, 0.22); }
  .status-grid { grid-template-columns: 1fr; }
}

.login-body { min-height: 100vh; display: grid; place-items: center; background: #080b12; color: #f8fafc; }
.login-card { width: min(420px, calc(100vw - 32px)); display: grid; gap: 14px; padding: 28px; border: 1px solid rgba(255,255,255,.12); border-radius: 18px; background: rgba(15,23,42,.92); box-shadow: 0 24px 80px rgba(0,0,0,.35); }
.login-card h1 { margin: 0; }
.login-card label { display: grid; gap: 6px; font-size: 13px; color: #cbd5e1; }
.login-card input { border: 1px solid rgba(255,255,255,.14); border-radius: 10px; background: rgba(2,6,23,.75); color: #f8fafc; padding: 11px 12px; }
.login-card button, .logout-button { border: 0; border-radius: 10px; background: #facc15; color: #111827; font-weight: 700; padding: 11px 14px; cursor: pointer; }
.login-error { border: 1px solid rgba(248,113,113,.45); background: rgba(127,29,29,.35); color: #fecaca; border-radius: 10px; padding: 10px; font-size: 13px; }
.muted { color: #94a3b8; margin: 0; }
.logout-button { padding: 8px 10px; font-size: 12px; }


.teach-controls { display: grid; grid-template-columns: 1fr auto auto; gap: 8px; align-items: center; padding: 10px; border: 1px solid rgba(250,204,21,.24); border-radius: 12px; background: rgba(250,204,21,.08); }
.teach-controls input { min-width: 0; border: 1px solid rgba(255,255,255,.12); border-radius: 9px; background: rgba(2,6,23,.55); color: #f8fafc; padding: 9px 10px; }
.teach-controls button { border: 0; border-radius: 9px; background: #facc15; color: #111827; font-weight: 700; padding: 9px 10px; cursor: pointer; }
.teach-controls span { grid-column: 1 / -1; color: #fde68a; font-size: 12px; }
.header-actions { display: flex; gap: 8px; align-items: center; }