:root {
  --bg: #f8f9fa;
  --card-bg: #ffffff;
  --text: #1a1a2e;
  --text-secondary: #6c757d;
  --accent: #e85d04;
  --accent-hover: #dc2f02;
  --green: #2d6a4f;
  --red: #d00000;
  --yellow: #e9c46a;
  --border: #e9ecef;
  --shadow: 0 2px 12px rgba(0,0,0,0.06);
  --radius: 12px;
  --breakfast-color: #f4a261;
  --lunch-color: #2a9d8f;
  --dinner-color: #264653;
}

* { 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;
}

.app {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

header {
  text-align: center;
  margin-bottom: 2rem;
}

header h1 {
  font-size: 2.4rem;
  color: var(--accent);
  letter-spacing: -0.5px;
}

.tagline {
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 1.75rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

h2 {
  font-size: 1.3rem;
  margin-bottom: 1.25rem;
  color: var(--text);
}

h3 {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
}

.form-group label {
  font-weight: 600;
  font-size: 0.85rem;
  margin-bottom: 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
}

select {
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
  background: var(--card-bg);
  cursor: pointer;
}

select:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.checkbox-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.chip {
  display: inline-flex;
  align-items: center;
  cursor: pointer;
}

.chip input { display: none; }

.chip span {
  padding: 0.35rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.85rem;
  transition: all 0.2s;
  user-select: none;
}

.chip input:checked + span {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.stepper {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.stepper-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--card-bg);
  font-size: 1.1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

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

.stepper-value {
  font-size: 1.3rem;
  font-weight: 700;
  min-width: 2rem;
  text-align: center;
}

.primary-btn {
  display: block;
  width: 100%;
  margin-top: 1.25rem;
  padding: 0.85rem;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, opacity 0.2s;
}

.primary-btn:hover:not(:disabled) {
  background: var(--accent-hover);
}

.primary-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.secondary-btn {
  padding: 0.5rem 1.2rem;
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

.secondary-btn:hover {
  background: rgba(232, 93, 4, 0.08);
}

.hidden { display: none !important; }

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

.results-header h2 { margin-bottom: 0; }

.meal-plan-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.meal-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 1.25rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}

.meal-badge {
  display: inline-block;
  padding: 0.2rem 0.65rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: white;
  margin-bottom: 0.5rem;
}

.meal-badge.breakfast { background: var(--breakfast-color); }
.meal-badge.lunch { background: var(--lunch-color); }
.meal-badge.dinner { background: var(--dinner-color); }

.meal-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.ingredient-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.ingredient-list li {
  background: var(--bg);
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.substitution-section {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px dashed var(--border);
}

.substitution-section h4 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
}

.substitution-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.82rem;
  margin-bottom: 0.2rem;
  color: var(--text-secondary);
}

.substitution-item .original {
  text-decoration: line-through;
  color: var(--red);
}

.substitution-item .arrow {
  color: var(--accent);
}

.substitution-item .replacement {
  color: var(--green);
  font-weight: 600;
}

.grocery-card h2 { margin-bottom: 1rem; }

.grocery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.6rem;
}

.grocery-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.5rem 0.75rem;
  background: var(--bg);
  border-radius: 8px;
  font-size: 0.9rem;
}

.grocery-item .item-name {
  font-weight: 500;
}

.grocery-item .item-qty {
  color: var(--text-secondary);
  font-size: 0.82rem;
}

.grocery-item .item-price {
  font-weight: 600;
  color: var(--green);
  font-size: 0.85rem;
}

.grocery-total {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 2px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 1.1rem;
  font-weight: 700;
}

.budget-status {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.budget-status.within { color: var(--green); }
.budget-status.over { color: var(--red); }
.budget-status.near { color: #e76f51; }

.budget-bar-container {
  background: var(--bg);
  border-radius: 8px;
  height: 16px;
  overflow: hidden;
  margin-bottom: 0.75rem;
}

.budget-bar {
  height: 100%;
  border-radius: 8px;
  transition: width 0.5s ease;
}

.budget-bar.within { background: var(--green); }
.budget-bar.over { background: var(--red); }
.budget-bar.near { background: #e76f51; }

.budget-details {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.budget-details strong {
  color: var(--text);
}

@media (min-width: 640px) {
  .meal-plan-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .form-grid {
    grid-template-columns: 1fr;
  }

  .results-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }
}