body {
  display: flex;
  flex-direction: column;
}

#app {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.page {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ── Nav ── */

#nav {
  padding: .75em 1.5em;
  border-bottom: 1px solid #444;
  display: flex;
  align-items: center;
  gap: 2em;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  gap: 1em;
}

.nav-link {
  color: #888;
  text-decoration: none;
  padding: .25em .5em;
}

.nav-link:hover { color: #eee; }
.nav-link.active { color: #eee; border-bottom: 2px solid #eee; }

/* ── Dashboard ── */

.dashboard {
  padding: 2em;
  overflow-y: auto;
}

.dashboard section {
  margin-bottom: 2em;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1em;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1em;
}

.card {
  background: #333;
  border: 1px solid #444;
  padding: 1em;
  display: flex;
  flex-direction: column;
  gap: .5em;
}

.card.clickable { cursor: pointer; }
.card.clickable:hover { border-color: #888; }

.card-icon { font-size: 2em; }
.card-title { font-weight: bold; }
.card-sub { color: #888; }

.card.placeholder {
  border-style: dashed;
  color: #666;
}

/* ── Session Page ── */

.session-page {
  display: flex;
  flex-direction: column;
}

.session-header {
  padding: .75em 1.5em;
  border-bottom: 1px solid #444;
  display: flex;
  align-items: center;
  gap: 1em;
  flex-shrink: 0;
}

.back-btn {
  background: none;
  border: none;
  padding: .25em .5em;
}

.editable-title {
  cursor: pointer;
}

.editable-title:hover {
  text-decoration: underline;
  text-decoration-style: dotted;
}

/* ── Placeholder Pages ── */

.placeholder-page {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1em;
  color: #888;
}

.placeholder-icon {
  font-size: 4em;
}