/* =====================
   ROOT VARIABLES
===================== */
:root {
  /* Colors */
  --income-color: #22c55e;
  --expense-color: #ef4444;
  --balance-color: #3b82f6;
  --warning-color: #f59e0b;
  --success-color: #10b981;
  
  /* Dark Theme */
  --bg-color: #020617;
  --bg-gradient: radial-gradient(circle at top, #0b1120, #000);
  --surface: rgba(255, 255, 255, 0.06);
  --surface-hover: rgba(255, 255, 255, 0.1);
  --surface-strong: rgba(255, 255, 255, 0.12);
  --border-color: rgba(255, 255, 255, 0.14);
  
  --text-primary: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  
  --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.35);
  --shadow-card: 0 16px 40px rgba(15, 23, 42, 0.45);
  --shadow-hover: 0 20px 50px rgba(0, 0, 0, 0.5);
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition: 0.25s ease;
  --transition-slow: 0.35s ease;
  
  /* Font Sizes */
  --font-xs: 0.75rem;
  --font-sm: 0.875rem;
  --font-base: 1rem;
  --font-lg: 1.125rem;
  --font-xl: 1.25rem;
  --font-2xl: 1.5rem;
  --font-3xl: 1.875rem;
  
  /* Z-index */
  --z-dropdown: 10;
  --z-sticky: 50;
  --z-modal: 100;
  --z-toast: 150;
  --z-loader: 200;
}

/* Light Theme */
body.light-theme {
  --bg-color: #f8fafc;
  --bg-gradient: radial-gradient(circle at top, #ffffff, #e2e8f0);
  --surface: rgba(15, 23, 42, 0.04);
  --surface-hover: rgba(15, 23, 42, 0.08);
  --surface-strong: rgba(15, 23, 42, 0.08);
  --border-color: rgba(15, 23, 42, 0.12);
  
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  
  --shadow-soft: 0 8px 24px rgba(15, 23, 42, 0.12);
  --shadow-card: 0 16px 32px rgba(15, 23, 42, 0.16);
  --shadow-hover: 0 20px 40px rgba(15, 23, 42, 0.2);
}

/* =====================
   RESET & BASE
===================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  background: var(--bg-color);
  background-image: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
}

/* Improved Focus Styles */
*:focus-visible {
  outline: 2px solid var(--balance-color);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

button:focus-visible {
  outline-color: currentColor;
}

/* Better Text Selection */
::selection {
  background-color: var(--balance-color);
  color: white;
}

/* =====================
   TYPOGRAPHY
===================== */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.section-title {
  font-size: var(--font-2xl);
  margin-bottom: var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--text-primary);
}

.section-title i {
  color: var(--balance-color);
  font-size: var(--font-xl);
}

/* =====================
   HEADER
===================== */
.app-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg) var(--spacing-xl);
  background: color-mix(in srgb, var(--bg-color) 70%, transparent);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-color);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.app-title {
  font-size: var(--font-2xl);
  font-weight: 700;
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.app-title i {
  color: var(--balance-color);
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.primary-nav ul {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
}

.primary-nav a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: var(--font-sm);
  font-weight: 500;
  transition: color var(--transition);
  position: relative;
  padding: var(--spacing-xs) 0;
}

.primary-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--balance-color);
  transition: width var(--transition);
}

.primary-nav a:hover {
  color: var(--text-primary);
}

.primary-nav a:hover::after {
  width: 100%;
}

#themeToggle {
  background: var(--surface);
  border: 1px solid var(--border-color);
  font-size: var(--font-xl);
  cursor: pointer;
  color: var(--text-secondary);
  border-radius: var(--radius);
  padding: var(--spacing-xs) var(--spacing-sm);
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
}

#themeToggle:hover {
  background: var(--surface-hover);
  border-color: var(--balance-color);
  transform: rotate(20deg);
}

/* =====================
   MAIN LAYOUT
===================== */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-lg) var(--spacing-2xl);
}

section {
  margin-bottom: var(--spacing-2xl);
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

/* =====================
   SUMMARY CARDS
===================== */
.summary-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--spacing-lg);
}

.card {
  background: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-lg);
  backdrop-filter: blur(16px);
  transition: transform var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--balance-color), var(--success-color));
  opacity: 0;
  transition: opacity var(--transition);
}

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

.card:hover::before {
  opacity: 1;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-sm);
}

.card h3 {
  font-size: var(--font-sm);
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.card-icon {
  font-size: var(--font-xl);
  opacity: 0.6;
}

.card-amount {
  font-size: var(--font-3xl);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.card-income .card-amount { color: var(--income-color); }
.card-income .card-icon { color: var(--income-color); }

.card-expense .card-amount { color: var(--expense-color); }
.card-expense .card-icon { color: var(--expense-color); }

.card-balance .card-amount { color: var(--balance-color); }
.card-balance .card-icon { color: var(--balance-color); }

/* =====================
   FORMS
===================== */
form {
  background: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  backdrop-filter: blur(16px);
  box-shadow: var(--shadow-soft);
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group:last-child {
  margin-bottom: 0;
}

label {
  display: block;
  font-size: var(--font-sm);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
  font-weight: 500;
}

.required {
  color: var(--expense-color);
}

input,
select,
textarea {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  background: color-mix(in srgb, var(--bg-color) 85%, transparent);
  color: var(--text-primary);
  font-size: var(--font-base);
  font-family: inherit;
  transition: all var(--transition);
}

input:hover,
select:hover {
  border-color: color-mix(in srgb, var(--border-color) 50%, var(--balance-color));
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--balance-color);
  outline: none;
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

input::placeholder {
  color: var(--text-muted);
  opacity: 0.7;
}

input[type="number"] {
  font-variant-numeric: tabular-nums;
}

/* Custom Radio Buttons */
.radio-group {
  border: none;
  margin-bottom: var(--spacing-lg);
}

.radio-group legend {
  font-weight: 600;
  font-size: var(--font-sm);
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
}

.radio-wrapper {
  display: flex;
  gap: var(--spacing-lg);
}

.radio-label {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
  position: relative;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius);
  transition: background var(--transition);
}

.radio-label:hover {
  background: var(--surface-hover);
}

.radio-label input[type="radio"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.radio-custom {
  width: 20px;
  height: 20px;
  border: 2px solid var(--border-color);
  border-radius: 50%;
  position: relative;
  transition: all var(--transition);
}

.radio-label input[type="radio"]:checked + .radio-custom {
  border-color: var(--balance-color);
  background: var(--balance-color);
}

.radio-custom::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: white;
  transition: transform var(--transition);
}

.radio-label input[type="radio"]:checked + .radio-custom::after {
  transform: translate(-50%, -50%) scale(1);
}

.radio-text {
  font-size: var(--font-sm);
  font-weight: 500;
  color: var(--text-primary);
}

/* =====================
   BUTTONS
===================== */
button {
  border: none;
  border-radius: var(--radius);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-weight: 600;
  font-size: var(--font-sm);
  cursor: pointer;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-family: inherit;
  white-space: nowrap;
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

.btn-primary {
  background: linear-gradient(135deg, var(--balance-color), #2563eb);
  color: white;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
  background: var(--surface-strong);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--surface-hover);
  border-color: var(--balance-color);
}

.btn-danger {
  background: linear-gradient(135deg, var(--expense-color), #dc2626);
  color: white;
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

.btn-danger:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(239, 68, 68, 0.4);
}

button:active:not(:disabled) {
  transform: scale(0.98);
}

/* =====================
   TRANSACTIONS LIST
===================== */
.transaction-count {
  font-size: var(--font-sm);
  color: var(--text-muted);
  background: var(--surface);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
}

.transactions-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.transactions-list li {
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg);
  background: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  transition: all var(--transition);
  position: relative;
}

.transactions-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  border-radius: var(--radius-lg) 0 0 var(--radius-lg);
}

.transactions-list li.income::before {
  background: var(--income-color);
}

.transactions-list li.expense::before {
  background: var(--expense-color);
}

.transactions-list li:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-card);
}

.transaction-details {
  min-width: 0;
}

.transaction-description {
  font-size: var(--font-base);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-xs);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.transaction-meta {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  font-size: var(--font-xs);
  color: var(--text-muted);
}

.transaction-category,
.transaction-date {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.transaction-amount {
  font-size: var(--font-xl);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.transaction-actions {
  display: flex;
  gap: var(--spacing-xs);
}

.transaction-actions button {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-xs);
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: var(--spacing-2xl) var(--spacing-lg);
  color: var(--text-muted);
  background: var(--surface);
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-lg);
  grid-column: 1 / -1;
}

.empty-icon {
  font-size: 4rem;
  margin-bottom: var(--spacing-md);
  opacity: 0.5;
}

.empty-state h3 {
  font-size: var(--font-xl);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

.empty-state p {
  font-size: var(--font-sm);
}

/* Pagination Controls */
.pagination-controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  grid-column: 1 / -1;
  background: transparent !important;
  border: none !important;
  box-shadow: none !important;
}

.pagination-controls:hover {
  transform: none !important;
}

.pagination-controls span {
  color: var(--text-secondary);
  font-size: var(--font-sm);
  font-weight: 500;
}

/* =====================
   CHARTS
===================== */
.charts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-xl);
}

.chart-container {
  background: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-soft);
}

.chart-title {
  font-size: var(--font-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

.chart-wrapper {
  position: relative;
  height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.chart-wrapper canvas {
  max-height: 100%;
}

.report-actions {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

/* =====================
   MODALS
===================== */
.modal {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg);
  opacity: 0;
  transition: opacity var(--transition);
}

.modal:not(.hidden) {
  opacity: 1;
}

.modal.hidden {
  display: none;
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(2, 6, 23, 0.75);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.modal-content {
  position: relative;
  background: var(--surface);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  width: 100%;
  max-width: 500px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-card);
  max-height: 90vh;
  overflow-y: auto;
  animation: modalSlideIn var(--transition-slow);
}

@keyframes modalSlideIn {
  from {
    transform: translateY(-20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.modal-small {
  max-width: 400px;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xl);
}

.modal-header h2 {
  font-size: var(--font-xl);
  color: var(--text-primary);
}

.modal-close {
  background: none;
  color: var(--text-muted);
  font-size: var(--font-xl);
  padding: var(--spacing-xs);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--surface-hover);
  color: var(--text-primary);
}

.modal-body {
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.warning-icon {
  font-size: 3rem;
  color: var(--warning-color);
  margin-bottom: var(--spacing-md);
}

.modal-body p {
  margin-bottom: var(--spacing-sm);
}

.text-muted {
  color: var(--text-muted);
  font-size: var(--font-sm);
}

.modal-footer {
  display: flex;
  gap: var(--spacing-md);
  justify-content: flex-end;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
}

.modal-form {
  background: transparent;
  border: none;
  padding: 0;
  box-shadow: none;
}

/* =====================
   TOAST NOTIFICATIONS
===================== */
.toast {
  position: fixed;
  bottom: var(--spacing-xl);
  right: var(--spacing-xl);
  z-index: var(--z-toast);
  background: var(--surface);
  border: 1px solid var(--border-color);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-lg);
  display: none;
  align-items: center;
  gap: var(--spacing-md);
  box-shadow: var(--shadow-card);
  min-width: 300px;
  max-width: 500px;
  animation: toastSlideIn var(--transition);
}

@keyframes toastSlideIn {
  from {
    transform: translateX(400px);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

.toast-icon {
  font-size: var(--font-xl);
  flex-shrink: 0;
}

.toast-success {
  border-color: var(--success-color);
  background: color-mix(in srgb, var(--success-color) 10%, var(--surface));
}

.toast-success .toast-icon {
  color: var(--success-color);
}

.toast-success .toast-icon::before {
  content: '\f058'; /* fa-circle-check */
}

.toast-error {
  border-color: var(--expense-color);
  background: color-mix(in srgb, var(--expense-color) 10%, var(--surface));
}

.toast-error .toast-icon {
  color: var(--expense-color);
}

.toast-error .toast-icon::before {
  content: '\f06a'; /* fa-circle-exclamation */
}

.toast-info .toast-icon {
  color: var(--balance-color);
}

.toast-info .toast-icon::before {
  content: '\f05a'; /* fa-circle-info */
}

#toastMessage {
  flex: 1;
  font-size: var(--font-sm);
  color: var(--text-primary);
}

.toast-close {
  background: none;
  color: var(--text-muted);
  padding: var(--spacing-xs);
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
}

.toast-close:hover {
  background: var(--surface-hover);
  color: var(--text-primary);
}

/* =====================
   LOADING OVERLAY
===================== */
.loading-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-loader);
  background: rgba(2, 6, 23, 0.9);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-lg);
}

.loading-overlay.hidden {
  display: none;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border-color);
  border-top-color: var(--balance-color);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-overlay p {
  color: var(--text-secondary);
  font-size: var(--font-base);
}

/* =====================
   FOOTER
===================== */
.app-footer {
  text-align: center;
  padding: var(--spacing-xl);
  color: var(--text-muted);
  border-top: 1px solid var(--border-color);
  margin-top: var(--spacing-2xl);
}

.app-footer a {
  color: var(--balance-color);
  text-decoration: none;
  transition: color var(--transition);
}

.app-footer a:hover {
  color: color-mix(in srgb, var(--balance-color) 80%, white);
  text-decoration: underline;
}

/* =====================
   PRINT STYLES
===================== */
@media print {
  body {
    background: white !important;
    color: black !important;
  }

  .app-header,
  .transaction-section,
  .filters-section,
  .app-footer,
  .transaction-actions,
  .report-actions,
  button,
  #themeToggle {
    display: none !important;
  }

  .summary-cards,
  .chart-container,
  .transactions-section li {
    page-break-inside: avoid;
  }

  .card,
  .chart-container,
  .transactions-section li {
    box-shadow: none !important;
    border: 1px solid #ccc !important;
  }
}

/* =====================
   RESPONSIVE DESIGN
===================== */
@media (max-width: 1024px) {
  .charts-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --spacing-xl: 1.5rem;
    --spacing-2xl: 2rem;
  }

  .app-header {
    flex-direction: column;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
  }

  .app-title {
    font-size: var(--font-xl);
  }

  .primary-nav {
    width: 100%;
    justify-content: space-between;
  }

  .primary-nav ul {
    gap: var(--spacing-md);
  }

  .primary-nav a {
    font-size: var(--font-xs);
  }

  main {
    padding: var(--spacing-lg) var(--spacing-md);
  }

  .section-title {
    font-size: var(--font-xl);
  }

  .summary-cards {
    grid-template-columns: 1fr;
  }

  .card-amount {
    font-size: var(--font-2xl);
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .radio-wrapper {
    flex-direction: column;
    gap: var(--spacing-sm);
  }

  .transactions-list li {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }

  .transaction-amount {
    font-size: var(--font-lg);
  }

  .transaction-actions {
    justify-content: stretch;
  }

  .transaction-actions button {
    flex: 1;
  }

  .section-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .report-actions {
    width: 100%;
  }

  .report-actions button {
    flex: 1;
  }

  .modal-content {
    margin: var(--spacing-md);
    max-height: calc(100vh - 2 * var(--spacing-md));
  }

  .modal-footer {
    flex-direction: column-reverse;
  }

  .modal-footer button {
    width: 100%;
  }

  .toast {
    bottom: var(--spacing-md);
    right: var(--spacing-md);
    left: var(--spacing-md);
    min-width: auto;
  }

  .filter-actions {
    margin-top: var(--spacing-md);
  }

  .filter-actions button {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .app-title {
    font-size: var(--font-lg);
  }

  .app-title i {
    display: none;
  }

  .card-amount {
    font-size: var(--font-xl);
  }

  .chart-wrapper {
    height: 250px;
  }
}

/* =====================
   ACCESSIBILITY
===================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --border-color: rgba(255, 255, 255, 0.3);
  }

  body.light-theme {
    --border-color: rgba(0, 0, 0, 0.3);
  }

  button,
  input,
  select {
    border-width: 2px;
  }
}

/* Screen reader only class */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* =====================
   BROWSER COMPATIBILITY FALLBACKS
===================== */

/* Fallback for backdrop-filter (Firefox support) */
@supports not (backdrop-filter: blur(20px)) {
  .app-header {
    background: var(--bg-color);
    opacity: 0.95;
  }

  .modal-overlay {
    background: rgba(2, 6, 23, 0.85);
  }

  .loading-overlay {
    background: rgba(2, 6, 23, 0.95);
  }

  .card,
  form,
  .chart-container {
    background: var(--surface);
    opacity: 0.98;
  }
}

/* Fallback for color-mix() (older browsers) */
@supports not (background: color-mix(in srgb, white 50%, black)) {
  input,
  select,
  textarea {
    background: var(--surface);
  }

  .btn-secondary:hover:not(:disabled) {
    background: var(--surface-hover);
  }
}