* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: #f8f9fa;
  color: #1a1a1a;
  line-height: 1.6;
  min-height: 100vh;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  background: #fff;
  border-bottom: 1px solid #e0e0e0;
}

header h1 {
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

#auth-section {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

#user-info {
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
}

#user-info:not([hidden]) {
  display: flex;
}

#user-info span {
  color: #555;
}

#sign-out-btn {
  background: none;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 0.25rem 0.5rem;
  font-size: 0.8rem;
  cursor: pointer;
  color: #666;
}

#sign-out-btn:hover {
  border-color: #999;
  color: #333;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 2rem;
  background: #fff;
  border-bottom: 1px solid #e0e0e0;
}

.nav-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-controls button {
  background: none;
  border: 1px solid #ddd;
  border-radius: 4px;
  padding: 0.25rem 0.75rem;
  font-size: 1rem;
  cursor: pointer;
  color: #555;
}

.nav-controls button:hover:not(:disabled) {
  background: #f0f0f0;
  border-color: #bbb;
}

.nav-controls button:disabled {
  opacity: 0.3;
  cursor: not-allowed;
}

#current-date {
  font-size: 1rem;
  font-weight: 500;
  min-width: 8rem;
  text-align: center;
}

.view-tabs {
  display: flex;
  gap: 0.25rem;
}

.tab {
  background: none;
  border: 1px solid transparent;
  border-radius: 4px;
  padding: 0.35rem 0.75rem;
  font-size: 0.85rem;
  cursor: pointer;
  color: #888;
}

.tab:hover {
  color: #333;
}

.tab.active {
  background: #f0f0f0;
  border-color: #ddd;
  color: #1a1a1a;
  font-weight: 500;
}

main {
  max-width: 48rem;
  margin: 2rem auto;
  padding: 0 1.5rem;
}

/* Session cards */
.session-card {
  background: #fff;
  border: 1px solid #e8e8e8;
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
}

.session-header {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.session-time {
  font-size: 0.8rem;
  color: #888;
  font-variant-numeric: tabular-nums;
  flex-shrink: 0;
}

.session-id {
  font-size: 0.7rem;
  color: #bbb;
  font-family: monospace;
}

.session-summary {
  font-size: 0.95rem;
  color: #333;
  line-height: 1.7;
  white-space: pre-line;
}

.session-details {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid #f0f0f0;
  font-size: 0.88rem;
  color: #555;
  line-height: 1.8;
  white-space: pre-line;
}

/* Day summary */
#day-summary {
  margin-top: 2rem;
  padding: 1.5rem;
  background: #fafbfc;
  border: 1px solid #e8e8e8;
  border-radius: 8px;
  border-left: 3px solid #4a9eff;
}

#day-summary h3 {
  font-size: 0.85rem;
  font-weight: 600;
  color: #555;
  margin-bottom: 0.75rem;
}

#day-summary p {
  font-size: 0.92rem;
  color: #444;
  line-height: 1.8;
  white-space: pre-line;
}

#day-summary .day-details {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px dashed #ddd;
  font-size: 0.88rem;
  color: #555;
  line-height: 1.8;
  white-space: pre-line;
}

/* Weekly view */
#weekly-content {
  background: #fff;
  border: 1px solid #e8e8e8;
  border-radius: 8px;
  padding: 1.5rem;
}

#weekly-content h2 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
  color: #333;
}

#weekly-content .markdown {
  font-size: 0.9rem;
  line-height: 1.8;
}

#weekly-content .markdown h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
}

#weekly-content .markdown ul {
  padding-left: 1.25rem;
}

#weekly-content .markdown li {
  margin-bottom: 0.25rem;
}

#weekly-content .weekly-details {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px dashed #ddd;
}

/* Empty state */
#empty-state {
  text-align: center;
  padding: 4rem 1rem;
  color: #999;
}

/* Private badge */
.private-badge {
  display: inline-block;
  font-size: 0.65rem;
  background: #e8f4fd;
  color: #1976d2;
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
  margin-left: 0.5rem;
  vertical-align: middle;
  font-weight: 500;
}

/* Responsive */
@media (max-width: 640px) {
  header {
    flex-direction: column;
    gap: 0.75rem;
    padding: 1rem;
  }

  nav {
    flex-direction: column;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
  }

  main {
    padding: 0 1rem;
    margin: 1rem auto;
  }

  .session-card {
    padding: 1rem;
  }
}