:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --text: #1e293b;
  --error: #ef4444;
  --border: #e2e8f0;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg);
  color: var(--text);
  margin: 0;
  padding: 20px;
}

.app-container {
  max-width: 800px;
  margin: 0 auto;
}

header {
  text-align: center;
  margin-bottom: 30px;
}

header h1 { margin: 0; font-size: 2.5rem; color: #0f172a; }
header p { margin: 5px 0 0; color: #64748b; }

.setup-form, .results-section, .error-box {
  background: var(--card-bg);
  padding: 24px;
  border-radius: 12px;
  box-shadow: 0 4px 6px -1px rgb(0 0 0 / 0.05);
  margin-bottom: 24px;
}

.form-group {
  margin-bottom: 16px;
  display: flex;
  flex-direction: column;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

label {
  font-weight: 600;
  margin-bottom: 6px;
  font-size: 0.9rem;
}

input, select, textarea {
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 1rem;
}

textarea { height: 80px; resize: vertical; }

button {
  background: var(--primary);
  color: white;
  border: none;
  padding: 12px;
  border-radius: 6px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  width: 100%;
  transition: background 0.2s;
}

button:hover { background: var(--primary-hover); }

.hidden { display: none !important; }

.loading {
  text-align: center;
  padding: 40px 0;
}

.spinner {
  border: 4px solid var(--border);
  border-top: 4px solid var(--primary);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin: 0 auto 16px;
}

@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }

.error-box {
  border-left: 4px solid var(--error);
  color: var(--error);
  font-weight: 500;
}

.grid-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 16px;
}

@media(min-width: 600px) {
  .grid-container { grid-template-columns: repeat(2, 1fr); }
}

.meal-card {
  border: 1px solid var(--border);
  padding: 16px;
  border-radius: 8px;
  background: #fafafa;
}

.meal-card h3 { margin-top: 0; color: #0f172a; border-bottom: 2px solid var(--border); padding-bottom: 4px; }

.grocery-list {
  columns: 2;
  padding-left: 20px;
}

.grocery-list li { margin-bottom: 6px; }