:root {
  --bg: #ffffff;
  --bg-secondary: #f5f5f5;
  --text: #1a1a1a;
  --text-secondary: #666666;
  --border: #e0e0e0;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --danger: #dc2626;
  --success: #16a34a;
  --card-bg: #ffffff;
  --shadow: 0 1px 3px rgba(0,0,0,0.12);
  color-scheme: light;
}

[data-theme="dark"] {
  --bg: #0f0f0f;
  --bg-secondary: #1a1a1a;
  --text: #e5e5e5;
  --text-secondary: #999999;
  --border: #333333;
  --primary: #3b82f6;
  --primary-hover: #2563eb;
  --card-bg: #1a1a1a;
  --shadow: 0 1px 3px rgba(0,0,0,0.4);
  color-scheme: dark;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 1.5rem;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow);
}

.nav-brand h1 { font-size: 1.25rem; }

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

.btn {
  display: inline-block;
  padding: 0.5rem 1rem;
  border-radius: 0.375rem;
  text-decoration: none;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  font-size: 0.875rem;
  transition: all 0.15s;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover { background: var(--primary-hover); }

.btn-secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.btn-lg { padding: 0.75rem 1.5rem; font-size: 1rem; }

.btn-icon {
  background: none;
  border: none;
  color: var(--text);
  cursor: pointer;
  padding: 0.25rem;
  display: flex;
  align-items: center;
}

.hero {
  text-align: center;
  padding: 4rem 1rem;
}

.hero h2 { font-size: 2.5rem; margin-bottom: 1rem; }
.hero p { color: var(--text-secondary); margin-bottom: 2rem; font-size: 1.125rem; }

.dashboard { display: grid; gap: 2rem; }

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.stat-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.stat-card h3 { font-size: 0.875rem; color: var(--text-secondary); margin-bottom: 0.5rem; }
.stat-value { font-size: 2rem; font-weight: 700; }

.section { margin-top: 1rem; }
.section h2 { font-size: 1.25rem; margin-bottom: 1rem; }

.list {
  display: grid;
  gap: 0.5rem;
}

.list-item {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 0.375rem;
  padding: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.list-item .title { font-weight: 500; }
.list-item .meta { font-size: 0.8rem; color: var(--text-secondary); }

.badge {
  display: inline-block;
  padding: 0.125rem 0.5rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 500;
}

.badge-success { background: #dcfce7; color: #166534; }
.badge-warning { background: #fef3c7; color: #92400e; }
.badge-error { background: #fee2e2; color: #991b1b; }

[data-theme="dark"] .badge-success { background: #052e16; color: #4ade80; }
[data-theme="dark"] .badge-warning { background: #451a03; color: #fbbf24; }
[data-theme="dark"] .badge-error { background: #450a0a; color: #f87171; }

/* Chat styles */
.chat-container {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 64px);
  max-width: 800px;
  margin: 0 auto;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.message {
  max-width: 80%;
  padding: 0.75rem 1rem;
  border-radius: 1rem;
  line-height: 1.5;
  white-space: pre-wrap;
  word-break: break-word;
}

.message.user {
  align-self: flex-end;
  background: var(--primary);
  color: #fff;
  border-bottom-right-radius: 0.25rem;
}

.message.assistant {
  align-self: flex-start;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-bottom-left-radius: 0.25rem;
}

.chat-input {
  display: flex;
  gap: 0.5rem;
  padding: 1rem;
  border-top: 1px solid var(--border);
  background: var(--card-bg);
}

.chat-input textarea {
  flex: 1;
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 0.5rem;
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
  resize: none;
  font-family: inherit;
  min-height: 2.5rem;
  max-height: 8rem;
}

.chat-input button {
  padding: 0.75rem 1.5rem;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 0.5rem;
  cursor: pointer;
  font-weight: 500;
  align-self: flex-end;
}

.chat-input button:hover { background: var(--primary-hover); }
.chat-input button:disabled { opacity: 0.5; cursor: not-allowed; }

.typing-indicator {
  display: none;
  align-self: flex-start;
  padding: 0.75rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 1rem;
  color: var(--text-secondary);
  font-style: italic;
}