:root {
  --bg: #f4f7f9;
  --card: #fff;
  --text: #1a2b36;
  --muted: #5c6f7d;
  --accent: #1e6b8a;
  --accent2: #2a9d8f;
  --border: #d8e2ea;
  --done: #2a9d8f;
  --partial: #e9c46a;
  --open: #cbd5df;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100dvh;
}
.login-page {
  display: grid;
  place-items: center;
  padding: 1.5rem;
}
.login-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  width: min(400px, 100%);
  display: grid;
  gap: 0.75rem;
}
.muted { color: var(--muted); font-size: 0.9rem; }
.label { font-size: 0.85rem; font-weight: 600; }
.input, textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.65rem 0.75rem;
  font: inherit;
}
.btn {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 8px;
  padding: 0.55rem 0.9rem;
  font: inherit;
  cursor: pointer;
}
.btn.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn.ghost { text-decoration: none; color: var(--text); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.alert.err { background: #fde8e8; color: #9b1c1c; padding: 0.5rem; border-radius: 6px; }

.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}
.title { font-weight: 700; font-size: 1.1rem; }
.sub { font-size: 0.8rem; color: var(--muted); }

.layout {
  display: grid;
  grid-template-columns: minmax(220px, 280px) 1fr;
  gap: 0;
  min-height: calc(100dvh - 56px);
}
@media (max-width: 800px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { border-bottom: 1px solid var(--border); max-height: 40vh; overflow: auto; }
}
.sidebar, .panel { padding: 1rem; }
.sidebar { background: #eef3f7; border-right: 1px solid var(--border); overflow: auto; }
.chapter-list { display: grid; gap: 0.5rem; }
.chapter-btn {
  text-align: left;
  padding: 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--card);
  cursor: pointer;
}
.chapter-btn.active { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.chapter-btn .meta { font-size: 0.75rem; color: var(--muted); margin-top: 0.25rem; }

.objectives { margin-bottom: 1rem; }
.obj-list { list-style: none; padding: 0; margin: 0.5rem 0 0; display: grid; gap: 0.5rem; }
.obj-item {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.65rem 0.75rem;
  border-left: 4px solid var(--open);
}
.obj-item.partial { border-left-color: var(--partial); }
.obj-item.done { border-left-color: var(--done); }
.obj-item .cap { font-size: 0.85rem; color: var(--muted); margin-top: 0.35rem; }
.obj-item .fc { font-size: 0.8rem; color: #b45309; margin-top: 0.25rem; }

.chat { display: flex; flex-direction: column; min-height: 50vh; }
.messages {
  flex: 1;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 0.5rem 0 1rem;
  max-height: 55vh;
}
.bubble {
  max-width: 92%;
  padding: 0.75rem 0.9rem;
  border-radius: 12px;
  line-height: 1.45;
  white-space: pre-wrap;
}
.bubble.user { align-self: flex-end; background: #dbeafe; }
.bubble.assistant { align-self: flex-start; background: var(--card); border: 1px solid var(--border); }
.composer { display: grid; gap: 0.5rem; }
.voice-row { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; font-size: 0.85rem; }
.hint { color: var(--muted); }
.toggle { display: flex; align-items: center; gap: 0.35rem; margin-left: auto; }