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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: #333;
  background-color: #f8fafc;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

header {
  text-align: center;
  margin: 3rem;
}

header h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
  color: #1e293b;
}

header p {
  color: #64748b;
  font-size: 1.1rem;
}

/* form container */
.card {
  background-color: white;
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  margin-bottom: 2rem;
}

.card h2 {
  margin-bottom: 1.5rem;
  color: #1e293b;
}

/* form styles */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

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

.form-group label {
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: #374151;
}

.form-group input,
.form-group select {
  padding: 0.75rem;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: #3b82f6;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.co2-preview {
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
  border-radius: 8px;
  padding: 1rem;
  margin-bottom: 1rem;
  color: #166534;
}

.co2-preview.hidden {
  display: none;
}

/* add activity button */
.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-primary {
  background: #3b82f6;
  color: white;
  width: 100%;
}

.btn-primary:hover {
  background: #2563eb;
}

.btn-primary:disabled {
  background: #9ca3af;
  cursor: not-allowed;
}

/* ??? */
.btn-danger {
  background: #ef4444;
  color: white;
  padding: 0.5rem;
  font-size: 0.875rem;
}

.btn-danger:hover {
  background: #dc2626;
}
/* ??? */

/* Summary Cards */
.summary-section {
  margin: 3rem 0;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
}

.summary-card {
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.summary-card.total-emissions {
  background: linear-gradient(135deg, #fef2f2 0%, #fee2e2 100%);
  border-left: 4px solid #ef4444;
}

.summary-card.today-emissions {
  background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
  border-left: 4px solid #3b82f6;
}

.summary-card.activities-count {
  background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
  border-left: 4px solid #22c55e;
}

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

.summary-header h3 {
  font-size: 0.875rem;
  font-weight: 500;
  color: #6b7280;
}

.summary-header .icon {
  font-size: 1.25rem;
}

.summary-value {
  font-size: 2rem;
  font-weight: bold;
  color: #1e293b;
  margin-bottom: 0.25rem;
}

.summary-label {
  font-size: 0.75rem;
  color: #6b7280;
}

/* Filter Buttons */
.filter-section {
  margin: 3rem 0;
}

.filter-section h2 {
  margin-bottom: 1rem;
  color: #1e293b;
}

.filter-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.filter-btn {
  padding: 0.5rem 1rem;
  border: 1px solid #d1d5db;
  background: white;
  border-radius: 20px;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.2s;
}

.filter-btn:hover {
  background: #f3f4f6;
}

.filter-btn.active {
  background: #3b82f6;
  color: white;
  border-color: #3b82f6;
}

/* Charts */
.charts-section {
  margin: 3rem 0;
}

.charts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 2rem;
}

.chart-card {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.chart-card h3 {
  margin-bottom: 1rem;
  color: #1e293b;
}

.chart-container {
  position: relative;
  height: 300px;
}

/* Activities List */
.activities-section {
  margin: 3rem 0;
}

.activities-section h2 {
  margin-bottom: 1.5rem;
  color: #1e293b;
}

.activities-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.activity-item {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  transition: box-shadow 0.2s;
}

.activity-item:hover {
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.activity-header {
  display: flex;
  justify-content: between;
  align-items: flex-start;
  gap: 1rem;
}

.activity-info {
  flex: 1;
}

.activity-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.activity-title .icon {
  font-size: 1.25rem;
}

.activity-title h3 {
  font-size: 1.1rem;
  color: #1e293b;
}

.activity-badge {
  padding: 0.25rem 0.75rem;
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 500;
}

.activity-badge.transport {
  background: #dbeafe;
  color: #1e40af;
}

.activity-badge.food {
  background: #dcfce7;
  color: #166534;
}

.activity-badge.energy {
  background: #fef3c7;
  color: #92400e;
}

.activity-badge.other {
  background: #ede9fe;
  color: #7c3aed;
}

.activity-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.875rem;
  color: #6b7280;
}

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

.activity-emission {
  font-weight: bold;
  color: #ef4444;
  font-size: 1.1rem;
}

.empty-state {
  text-align: center;
  padding: 3rem;
  color: #6b7280;
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.empty-subtitle {
  font-size: 0.875rem;
  margin-top: 0.5rem;
}