/* ===========================================
   Yuvi's Monthly Money Tracker - Styles
   Modern, minimal design with pastel accents
   =========================================== */

/* ---------- CSS Variables / Design Tokens ---------- */
:root {
  /* Colors */
  --bg-primary: #f8f9fa;
  --bg-secondary: #ffffff;
  --text-primary: #2d3436;
  --text-secondary: #636e72;
  --text-muted: #b2bec3;
  
  /* Pastel Accents */
  --accent-mint: #00b894;
  --accent-coral: #ff7675;
  --accent-lavender: #a29bfe;
  --accent-sky: #74b9ff;
  --accent-peach: #fdcb6e;
  --accent-pink: #fd79a8;
  
  /* Card Colors */
  --card-income: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%);
  --card-expense: linear-gradient(135deg, #ff9a9e 0%, #fecfef 100%);
  --card-left: linear-gradient(135deg, #a1c4fd 0%, #c2e9fb 100%);
  --card-savings: linear-gradient(135deg, #d299c2 0%, #fef9d7 100%);
  
  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.1);
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  font-weight: 600;
  line-height: 1.3;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1rem; }

/* ---------- Layout ---------- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-md);
}

/* ---------- Header ---------- */
.header {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md);
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  border-radius: 0 0 var(--radius-xl) var(--radius-xl);
  margin-bottom: var(--spacing-lg);
  box-shadow: var(--shadow-lg);
}

.header h1 {
  font-size: 2.25rem;
  margin-bottom: var(--spacing-xs);
  font-weight: 700;
}

.header p {
  font-size: 1.1rem;
  opacity: 0.9;
}

.header-emoji {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

/* ---------- Summary Cards ---------- */
.summary-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.summary-card {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.summary-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
}

.summary-card--income::before { background: var(--accent-mint); }
.summary-card--expense::before { background: var(--accent-coral); }
.summary-card--left::before { background: var(--accent-sky); }
.summary-card--savings::before { background: var(--accent-lavender); }

.summary-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.summary-card__icon {
  font-size: 2rem;
  margin-bottom: var(--spacing-xs);
}

.summary-card__label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--spacing-xs);
}

.summary-card__value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
}

.summary-card--income .summary-card__value { color: var(--accent-mint); }
.summary-card--expense .summary-card__value { color: var(--accent-coral); }
.summary-card--left .summary-card__value { color: var(--accent-sky); }
.summary-card--savings .summary-card__value { color: var(--accent-lavender); }

/* ---------- Section Cards ---------- */
.section {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  box-shadow: var(--shadow-md);
}

.section__header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--bg-primary);
}

.section__icon {
  font-size: 1.5rem;
}

.section__title {
  font-size: 1.25rem;
  font-weight: 600;
}

/* ---------- Income Section ---------- */
.income-form {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--spacing-md);
  align-items: end;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-group input,
.form-group select {
  padding: var(--spacing-sm);
  border: 2px solid #e9ecef;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-family: inherit;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent-lavender);
  box-shadow: 0 0 0 3px rgba(162, 155, 254, 0.2);
}

.form-group input[type="number"] {
  -moz-appearance: textfield;
}

.form-group input[type="number"]::-webkit-outer-spin-button,
.form-group input[type="number"]::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

/* ---------- Expense Table ---------- */
.expense-table-container {
  overflow-x: auto;
  margin: 0 calc(var(--spacing-md) * -1);
  padding: 0 var(--spacing-md);
}

.expense-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.expense-table th,
.expense-table td {
  padding: var(--spacing-sm);
  text-align: left;
  border-bottom: 1px solid #e9ecef;
}

.expense-table th {
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: var(--bg-primary);
  position: sticky;
  top: 0;
}

.expense-table tbody tr {
  transition: background var(--transition-fast);
}

.expense-table tbody tr:hover {
  background: #f8f9fa;
}

.expense-table input {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid #dee2e6;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color var(--transition-fast);
}

.expense-table input:focus {
  outline: none;
  border-color: var(--accent-lavender);
}

.expense-table input.category-input {
  font-weight: 500;
}

.expense-table input.amount-input {
  text-align: right;
  max-width: 120px;
}

.expense-table__totals {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

.expense-table__totals td {
  font-weight: 600;
  padding: var(--spacing-sm) var(--spacing-sm);
  border: none;
}

/* ---------- Transaction Logger ---------- */
.transaction-form {
  display: grid;
  grid-template-columns: 1fr 2fr 1fr auto;
  gap: var(--spacing-sm);
  align-items: end;
}

.btn {
  padding: var(--spacing-sm) var(--spacing-md);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: inherit;
}

.btn--primary {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.btn--danger {
  background: linear-gradient(135deg, #ff6b6b 0%, #ee5a5a 100%);
  color: white;
}

.btn--danger:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(255, 107, 107, 0.4);
}

.transaction-list {
  margin-top: var(--spacing-md);
  max-height: 200px;
  overflow-y: auto;
}

.transaction-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm);
  background: var(--bg-primary);
  border-radius: var(--radius-sm);
  margin-bottom: var(--spacing-xs);
}

.transaction-item__info {
  display: flex;
  gap: var(--spacing-sm);
  align-items: center;
}

.transaction-item__date {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.transaction-item__category {
  font-weight: 500;
}

.transaction-item__amount {
  font-weight: 600;
  color: var(--accent-coral);
}

.transaction-item__delete {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 1.2rem;
  padding: 0.25rem;
  transition: color var(--transition-fast);
}

.transaction-item__delete:hover {
  color: var(--accent-coral);
}

/* ---------- Charts ---------- */
.charts-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
}

.chart-wrapper {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  box-shadow: var(--shadow-md);
}

.chart-wrapper h3 {
  text-align: center;
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
}

.chart-container {
  position: relative;
  max-width: 350px;
  margin: 0 auto;
}

/* ---------- Footer / Notes ---------- */
.footer {
  text-align: center;
  padding: var(--spacing-lg);
  color: var(--text-secondary);
}

.footer__note {
  font-size: 0.9rem;
  margin-bottom: var(--spacing-md);
  padding: var(--spacing-sm);
  background: #fff3cd;
  border-radius: var(--radius-sm);
  display: inline-block;
}

.footer__reset {
  margin-top: var(--spacing-sm);
}

/* ---------- Responsive Design ---------- */
@media (max-width: 768px) {
  .header h1 {
    font-size: 1.75rem;
  }
  
  .header p {
    font-size: 1rem;
  }
  
  .summary-cards {
    grid-template-columns: 1fr 1fr;
  }
  
  .income-form {
    grid-template-columns: 1fr;
  }
  
  .transaction-form {
    grid-template-columns: 1fr 1fr;
  }
  
  .transaction-form .form-group:nth-child(2) {
    grid-column: 1 / -1;
  }
  
  .charts-container {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .container {
    padding: var(--spacing-sm);
  }
  
  .header {
    padding: var(--spacing-lg) var(--spacing-sm);
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  }
  
  .summary-cards {
    grid-template-columns: 1fr;
  }
  
  .summary-card__value {
    font-size: 1.5rem;
  }
  
  .section {
    padding: var(--spacing-sm);
  }
  
  .expense-table th,
  .expense-table td {
    padding: var(--spacing-xs);
  }
  
  .expense-table input.amount-input {
    max-width: 80px;
  }
  
  .transaction-form {
    grid-template-columns: 1fr;
  }
  
  .transaction-form .form-group:nth-child(2) {
    grid-column: auto;
  }
}

/* ---------- Scrollbar Styling ---------- */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb {
  background: #cbd5e0;
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: #a0aec0;
}

/* ---------- Animations ---------- */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.section {
  animation: fadeIn 0.4s ease forwards;
}

.summary-card {
  animation: fadeIn 0.4s ease forwards;
}

.summary-card:nth-child(1) { animation-delay: 0.1s; }
.summary-card:nth-child(2) { animation-delay: 0.2s; }
.summary-card:nth-child(3) { animation-delay: 0.3s; }
.summary-card:nth-child(4) { animation-delay: 0.4s; }

/* ---------- Empty State ---------- */
.empty-state {
  text-align: center;
  padding: var(--spacing-lg);
  color: var(--text-muted);
}

.empty-state__icon {
  font-size: 2rem;
  margin-bottom: var(--spacing-sm);
}