/* CSS Variables - Light Theme (default) */
:root {
  /* Primary gradient colors */
  --primary-color: #6366f1;
  --primary-hover: #4f46e5;
  --primary-light: rgba(99, 102, 241, 0.1);
  --primary-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);

  /* Secondary colors */
  --secondary-color: #64748b;
  --success-color: #10b981;
  --success-light: rgba(16, 185, 129, 0.1);
  --success-gradient: linear-gradient(135deg, #10b981 0%, #34d399 100%);
  --danger-color: #ef4444;
  --danger-light: rgba(239, 68, 68, 0.1);
  --danger-gradient: linear-gradient(135deg, #ef4444 0%, #f87171 100%);
  --warning-color: #f59e0b;
  --warning-gradient: linear-gradient(135deg, #f59e0b 0%, #fbbf24 100%);

  /* Background & surfaces */
  --background: #f8fafc;
  --background-gradient: linear-gradient(135deg, #f0f4ff 0%, #faf5ff 50%, #fdf2f8 100%);
  --surface: rgba(255, 255, 255, 0.8);
  --surface-solid: #ffffff;
  --surface-hover: rgba(255, 255, 255, 0.95);

  /* Text */
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;

  /* Borders & effects */
  --border-color: rgba(148, 163, 184, 0.2);
  --border-light: rgba(255, 255, 255, 0.5);
  --focus-ring: 0 0 0 3px rgba(99, 102, 241, 0.3);
  --glass-blur: blur(20px);
  --glass-border: 1px solid rgba(255, 255, 255, 0.3);

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 40px -10px rgba(0, 0, 0, 0.15);
  --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.15);
  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.08);

  /* Sizing */
  --radius: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  /* Typography */
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;

  --sidebar-width: 260px;
}

/* Dark Theme */
[data-theme="dark"] {
  --primary-color: #818cf8;
  --primary-hover: #a5b4fc;
  --primary-light: rgba(129, 140, 248, 0.15);
  --primary-gradient: linear-gradient(135deg, #818cf8 0%, #a78bfa 100%);

  --secondary-color: #94a3b8;
  --success-color: #34d399;
  --success-light: rgba(52, 211, 153, 0.15);
  --success-gradient: linear-gradient(135deg, #34d399 0%, #6ee7b7 100%);
  --danger-color: #f87171;
  --danger-light: rgba(248, 113, 113, 0.15);
  --danger-gradient: linear-gradient(135deg, #f87171 0%, #fca5a5 100%);
  --warning-color: #fbbf24;
  --warning-gradient: linear-gradient(135deg, #fbbf24 0%, #fcd34d 100%);

  --background: #0f172a;
  --background-gradient: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #1e1338 100%);
  --surface: rgba(30, 41, 59, 0.8);
  --surface-solid: #1e293b;
  --surface-hover: rgba(30, 41, 59, 0.95);

  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --border-color: rgba(148, 163, 184, 0.15);
  --border-light: rgba(255, 255, 255, 0.1);
  --focus-ring: 0 0 0 3px rgba(129, 140, 248, 0.4);
  --glass-border: 1px solid rgba(255, 255, 255, 0.1);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.4);
  --shadow-xl: 0 20px 40px -10px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px rgba(129, 140, 248, 0.2);
  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.3);
}

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

/* Base */
html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

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

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--primary-gradient);
  color: white;
  padding: var(--spacing-sm) var(--spacing-md);
  z-index: 100;
  text-decoration: none;
  border-radius: var(--radius);
}

.skip-link:focus {
  top: var(--spacing-md);
  left: var(--spacing-md);
}

/* Focus styles for accessibility */
:focus {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  box-shadow: var(--focus-ring);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }

/* Layout */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.main-content {
  flex: 1;
  padding: var(--spacing-lg);
  padding-bottom: calc(80px + var(--spacing-lg));
  max-width: 100%;
}

/* ==========================================
   GLASSMORPHISM HEADER
   ========================================== */
.app-header {
  background: var(--surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: var(--glass-border);
  padding: var(--spacing-md) var(--spacing-lg);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: var(--shadow-sm);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1400px;
  margin: 0 auto;
}

.app-logo {
  font-size: var(--font-size-xl);
  font-weight: 800;
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

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

/* Header Action Buttons */
.header-action-btn {
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-sm);
  min-height: 42px;
  border-radius: var(--radius);
}

.header-action-btn svg {
  flex-shrink: 0;
}

.header-btn-text {
  display: none;
}

@media (min-width: 520px) {
  .header-btn-text {
    display: inline;
  }

  .header-actions {
    gap: var(--spacing-md);
  }
}

/* ==========================================
   GLASSMORPHISM NAVIGATION
   ========================================== */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-top: var(--glass-border);
  display: flex;
  justify-content: space-around;
  padding: var(--spacing-sm) var(--spacing-xs);
  z-index: 50;
  box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.1);
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--spacing-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  border: none;
  background: none;
  cursor: pointer;
  min-width: 60px;
  border-radius: var(--radius);
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
}

.nav-item::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--primary-gradient);
  border-radius: var(--radius);
  opacity: 0;
  transition: opacity 0.3s;
}

.nav-item:hover::before,
.nav-item.active::before {
  opacity: 0.1;
}

.nav-item:hover,
.nav-item:focus-visible {
  color: var(--primary-color);
  transform: translateY(-2px);
}

.nav-item.active {
  color: var(--primary-color);
  font-weight: 600;
}

.nav-item svg {
  width: 24px;
  height: 24px;
  margin-bottom: 4px;
  position: relative;
  z-index: 1;
  transition: transform 0.3s;
}

.nav-item:hover svg {
  transform: scale(1.1);
}

.nav-item span {
  font-size: 0.7rem;
  position: relative;
  z-index: 1;
}

/* ==========================================
   MODERN CARDS WITH GLASSMORPHISM
   ========================================== */
.card {
  background: var(--surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-card);
  border: var(--glass-border);
  transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
  box-shadow: var(--shadow-lg);
}

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

.card-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
}

/* ==========================================
   ANIMATED STATS CARDS
   ========================================== */
.stats-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-xl);
}

.stat-card {
  background: var(--surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  text-align: center;
  border: var(--glass-border);
  box-shadow: var(--shadow-card);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: var(--primary-gradient);
  opacity: 0;
  transition: opacity 0.3s;
}

.stat-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl), var(--shadow-glow);
}

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

.stat-label {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 600;
}

.stat-value {
  font-size: var(--font-size-3xl);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.stat-value.positive {
  background: var(--success-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-value.negative {
  background: var(--danger-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ==========================================
   MODERN BUTTONS
   ========================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: 600;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  text-decoration: none;
  min-height: 46px;
  min-width: 46px;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, transparent 50%);
  opacity: 0;
  transition: opacity 0.3s;
}

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

.btn-primary {
  background: var(--primary-gradient);
  color: white;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.35);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(99, 102, 241, 0.45);
}

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

.btn-secondary:hover,
.btn-secondary:focus-visible {
  background: var(--surface-hover);
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.btn-success {
  background: var(--success-gradient);
  color: white;
  box-shadow: 0 4px 15px rgba(16, 185, 129, 0.35);
}

.btn-success:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(16, 185, 129, 0.45);
}

.btn-danger {
  background: var(--danger-gradient);
  color: white;
  box-shadow: 0 4px 15px rgba(239, 68, 68, 0.35);
}

.btn-danger:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(239, 68, 68, 0.45);
}

.btn-outline {
  background: var(--surface);
  backdrop-filter: var(--glass-blur);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

.btn-outline:hover,
.btn-outline:focus-visible {
  background: var(--surface-hover);
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.btn-icon {
  padding: var(--spacing-sm);
}

.btn-block {
  width: 100%;
}

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

/* ==========================================
   FORMS - MODERN STYLE
   ========================================== */
.form-group {
  margin-bottom: var(--spacing-md);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: var(--spacing-md);
  font-size: var(--font-size-base);
  border: 2px solid var(--border-color);
  border-radius: var(--radius);
  background: var(--surface-solid);
  color: var(--text-primary);
  min-height: 48px;
  transition: all 0.3s;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--primary-color);
  box-shadow: var(--focus-ring);
  background: var(--surface-hover);
}

.form-input::placeholder {
  color: var(--text-muted);
}

.form-textarea {
  min-height: 100px;
  resize: vertical;
}

.form-error {
  color: var(--danger-color);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-xs);
}

/* Toggle Group */
.toggle-group {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.toggle-option {
  flex: 1;
}

.toggle-option input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.toggle-option label {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md);
  text-align: center;
  border: 2px solid var(--border-color);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.3s;
  min-height: 48px;
  font-weight: 600;
  background: var(--surface-solid);
}

.toggle-option input:checked + label {
  border-color: var(--primary-color);
  background: var(--primary-light);
  color: var(--primary-color);
}

.toggle-option input:focus-visible + label {
  box-shadow: var(--focus-ring);
}

/* Autocomplete */
.autocomplete-wrapper {
  position: relative;
}

.autocomplete-list {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--surface-solid);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  max-height: 200px;
  overflow-y: auto;
  z-index: 100;
  box-shadow: var(--shadow-xl);
  margin-top: var(--spacing-xs);
}

.autocomplete-item {
  padding: var(--spacing-md);
  cursor: pointer;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  min-height: 48px;
  display: flex;
  align-items: center;
  transition: background 0.2s;
  color: var(--text-primary);
}

.autocomplete-item:hover,
.autocomplete-item:focus,
.autocomplete-item.highlighted {
  background: var(--primary-light);
}

.autocomplete-item.create-new {
  color: var(--primary-color);
  font-weight: 600;
  border-top: 1px solid var(--border-color);
}

/* Spending Items (Repeater) */
.spending-items {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.spending-item {
  background: var(--background);
  border-radius: var(--radius);
  padding: var(--spacing-md);
  position: relative;
  border: 1px solid var(--border-color);
}

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

.spending-item-number {
  font-weight: 700;
  color: var(--text-secondary);
}

.remove-item-btn {
  color: var(--danger-color);
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-xs);
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  transition: all 0.2s;
}

.remove-item-btn:hover {
  background: var(--danger-light);
}

/* ==========================================
   MODERN TABLES
   ========================================== */
.table-container {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-sm);
}

.data-table th,
.data-table td {
  padding: var(--spacing-md);
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.data-table th {
  background: var(--primary-light);
  font-weight: 700;
  white-space: nowrap;
  color: var(--text-primary);
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 1px;
}

.data-table tbody tr {
  transition: all 0.2s;
}

.data-table tbody tr:hover {
  background: var(--primary-light);
}

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

/* Mobile table cards */
@media (max-width: 600px) {
  .data-table thead {
    display: none;
  }

  .data-table tbody tr {
    display: block;
    margin-bottom: var(--spacing-md);
    background: var(--surface-solid);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
  }

  .data-table td {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: none;
    padding: var(--spacing-xs) 0;
  }

  .data-table td::before {
    content: attr(data-label);
    font-weight: 700;
    color: var(--text-secondary);
    margin-right: var(--spacing-sm);
  }

  .data-table td:last-child {
    justify-content: flex-end;
  }
}

/* ==========================================
   MODERN TABS
   ========================================== */
.tabs {
  display: flex;
  background: var(--surface);
  border-radius: var(--radius);
  padding: var(--spacing-xs);
  margin-bottom: var(--spacing-lg);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  gap: var(--spacing-xs);
}

.tab {
  padding: var(--spacing-md) var(--spacing-lg);
  border: none;
  background: transparent;
  cursor: pointer;
  font-weight: 600;
  color: var(--text-secondary);
  border-radius: var(--radius);
  white-space: nowrap;
  min-height: 44px;
  transition: all 0.3s;
  position: relative;
}

.tab:hover,
.tab:focus-visible {
  color: var(--primary-color);
  background: var(--primary-light);
}

.tab.active {
  color: white;
  background: var(--primary-gradient);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

/* ==========================================
   GLASSMORPHISM MODAL
   ========================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.6);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  z-index: 1000;
  padding: var(--spacing-md);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.modal {
  background: var(--surface-solid);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  width: 100%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideUp 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: var(--shadow-xl);
}

@keyframes slideUp {
  from {
    transform: translateY(100%);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  background: var(--surface-solid);
  z-index: 1;
}

.modal-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
}

.modal-close {
  background: var(--surface);
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
  color: var(--text-secondary);
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all 0.2s;
}

.modal-close:hover {
  background: var(--danger-light);
  color: var(--danger-color);
}

.modal-body {
  padding: var(--spacing-lg);
}

.modal-footer {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  padding: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
  background: var(--surface);
}

.modal-footer .btn {
  flex: 1 1 auto;
  min-width: 100px;
}

/* Stack buttons on small screens when there are 3+ buttons */
@media (max-width: 480px) {
  .modal-footer {
    flex-direction: column;
  }

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

/* ==========================================
   MODERN LOGIN PAGE
   ========================================== */
.login-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: var(--spacing-md);
}

.login-card {
  background: var(--surface);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-xl), var(--shadow-glow);
  border: var(--glass-border);
}

.login-title {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  font-size: var(--font-size-2xl);
  background: var(--primary-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Language Switcher */
.language-switcher {
  display: flex;
  gap: var(--spacing-xs);
}

.lang-btn {
  padding: var(--spacing-xs) var(--spacing-md);
  border: 2px solid var(--border-color);
  background: var(--surface);
  border-radius: var(--radius);
  cursor: pointer;
  font-size: var(--font-size-sm);
  min-width: 44px;
  min-height: 38px;
  transition: all 0.3s;
  font-weight: 600;
  color: var(--text-primary);
}

.lang-btn:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.lang-btn.active {
  background: var(--primary-gradient);
  color: white;
  border-color: transparent;
}

/* Toast/Notification */
.toast-container {
  position: fixed;
  top: var(--spacing-lg);
  right: var(--spacing-lg);
  left: var(--spacing-lg);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  pointer-events: none;
}

.toast {
  background: var(--surface-solid);
  border-radius: var(--radius);
  padding: var(--spacing-md) var(--spacing-lg);
  box-shadow: var(--shadow-xl);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  animation: toastIn 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: auto;
  border-left: 4px solid;
}

.toast.success {
  border-left-color: var(--success-color);
  background: linear-gradient(90deg, var(--success-light) 0%, var(--surface-solid) 100%);
}

.toast.error {
  border-left-color: var(--danger-color);
  background: linear-gradient(90deg, var(--danger-light) 0%, var(--surface-solid) 100%);
}

@keyframes toastIn {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Charts Container */
.chart-container {
  position: relative;
  height: 300px;
  margin-bottom: var(--spacing-lg);
  background: var(--surface);
  border-radius: var(--radius);
  padding: var(--spacing-md);
}

/* Recent Spendings List */
.spendings-list {
  display: flex;
  flex-direction: column;
}

.spending-list-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border-color);
  transition: all 0.2s;
  border-radius: var(--radius);
  margin: 0 calc(-1 * var(--spacing-md));
}

.spending-list-item:last-child {
  border-bottom: none;
}

.spending-list-item:hover {
  background: var(--primary-light);
}

.spending-info {
  flex: 1;
}

.spending-name {
  font-weight: 600;
  margin-bottom: 2px;
}

.spending-date {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.spending-amount {
  font-weight: 700;
  font-size: var(--font-size-lg);
}

.spending-amount:not(.positive) {
  background: var(--danger-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.spending-amount.positive {
  background: var(--success-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Dashboard Cards Grid */
.dashboard-cards {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

/* Loading Spinner */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-2xl);
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border-color);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Empty State */
.empty-state {
  text-align: center;
  padding: var(--spacing-2xl);
  color: var(--text-secondary);
}

.empty-state svg {
  width: 64px;
  height: 64px;
  margin-bottom: var(--spacing-md);
  opacity: 0.5;
}

/* Spending Details Modal */
.spending-details {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.detail-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--border-color);
}

.detail-label {
  font-weight: 600;
  color: var(--text-secondary);
}

.detail-value {
  font-weight: 600;
  text-align: right;
}

.detail-section-title {
  font-size: var(--font-size-base);
  font-weight: 700;
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.detail-items-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  background: var(--background);
  padding: var(--spacing-md);
  border-radius: var(--radius);
}

.detail-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--border-color);
}

.detail-item:last-child {
  border-bottom: none;
}

.detail-item-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.detail-item-name {
  font-weight: 600;
}

.detail-item-category {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.detail-item-amount {
  font-weight: 700;
}

.detail-total {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) 0;
  margin-top: var(--spacing-md);
  border-top: 2px solid var(--border-color);
  font-size: var(--font-size-lg);
  font-weight: 700;
}

/* Settings Page */
.settings-container {
  max-width: 500px;
}

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

/* Clickable Table Rows */
.clickable-row {
  cursor: pointer;
  transition: all 0.2s;
}

.clickable-row:hover {
  background: var(--primary-light);
  transform: scale(1.01);
}

.chevron-icon {
  color: var(--text-secondary);
  transition: all 0.3s;
}

.clickable-row:hover .chevron-icon {
  transform: translateX(4px);
  color: var(--primary-color);
}

/* Day Spendings Modal */
.day-spendings-list {
  display: flex;
  flex-direction: column;
}

.day-spending-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--border-color);
}

.day-spending-item:last-child {
  border-bottom: none;
}

.day-spending-info {
  flex: 1;
}

.day-spending-name {
  font-weight: 600;
  margin-bottom: 2px;
}

.day-spending-meta {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.day-spending-amount {
  font-weight: 700;
  font-size: var(--font-size-lg);
}

.day-total {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md);
  margin-top: var(--spacing-md);
  background: var(--primary-light);
  border-radius: var(--radius);
  font-size: var(--font-size-lg);
  font-weight: 700;
}

/* Month Switcher */
.month-switcher {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  background: var(--surface);
  padding: var(--spacing-sm);
  border-radius: var(--radius);
}

.month-display {
  font-weight: 700;
  font-size: var(--font-size-lg);
  min-width: 160px;
  text-align: center;
  text-transform: capitalize;
  color: var(--text-primary);
}

/* Custom Range Group */
.custom-range-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-color);
  align-items: flex-end;
}

.custom-range-group .form-group {
  flex: 1;
  min-width: 120px;
  margin-bottom: 0;
}

.custom-range-group .btn {
  flex-shrink: 0;
}

/* Utility Classes */
.hidden {
  display: none !important;
}

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

.text-center {
  text-align: center;
}

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

/* ============================================
   DESKTOP STYLES (768px and up)
   ============================================ */
@media (min-width: 768px) {
  :root {
    --font-size-3xl: 2.25rem;
    --font-size-4xl: 3rem;
  }

  .app-container {
    flex-direction: row;
    flex-wrap: wrap;
  }

  /* Header spans full width */
  .app-header {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-xl);
  }

  .app-logo {
    font-size: var(--font-size-2xl);
  }

  /* Sidebar Navigation */
  .bottom-nav {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    flex-direction: column;
    justify-content: flex-start;
    padding: var(--spacing-xl) var(--spacing-md);
    padding-top: 90px;
    border-top: none;
    border-right: var(--glass-border);
    box-shadow: var(--shadow-lg);
    gap: var(--spacing-xs);
    z-index: 40;
  }

  .nav-item {
    flex-direction: row;
    justify-content: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    min-width: auto;
    width: 100%;
    border-radius: var(--radius);
  }

  .nav-item svg {
    margin-bottom: 0;
    width: 22px;
    height: 22px;
  }

  .nav-item span {
    font-size: var(--font-size-base);
  }

  .nav-item.active {
    background: var(--primary-light);
  }

  .nav-item:hover {
    transform: translateX(4px);
  }

  /* Main Content with sidebar offset */
  .main-content {
    margin-left: var(--sidebar-width);
    padding: var(--spacing-xl) var(--spacing-2xl);
    padding-bottom: var(--spacing-xl);
    max-width: calc(100% - var(--sidebar-width));
    min-height: calc(100vh - 70px);
  }

  /* Center content on very wide screens */
  .main-content > * {
    max-width: 1200px;
  }

  /* Stats Grid */
  .stats-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
  }

  .stat-card {
    padding: var(--spacing-xl);
  }

  .stat-value {
    font-size: var(--font-size-4xl);
  }

  /* Cards */
  .card {
    padding: var(--spacing-xl);
  }

  .card-header {
    margin-bottom: var(--spacing-xl);
  }

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

  /* Dashboard Cards Grid */
  .dashboard-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
  }

  /* Modal */
  .modal-overlay {
    align-items: center;
  }

  .modal {
    border-radius: var(--radius-xl);
    max-width: 560px;
    max-height: 85vh;
    animation: fadeInScale 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  }

  @keyframes fadeInScale {
    from {
      opacity: 0;
      transform: scale(0.9);
    }
    to {
      opacity: 1;
      transform: scale(1);
    }
  }

  .modal-header,
  .modal-body,
  .modal-footer {
    padding: var(--spacing-xl);
  }

  /* Toast */
  .toast-container {
    left: auto;
    right: var(--spacing-xl);
    max-width: 400px;
  }

  /* Tables */
  .data-table th,
  .data-table td {
    padding: var(--spacing-md) var(--spacing-lg);
  }

  /* Charts */
  .chart-container {
    height: 350px;
  }

  /* Login */
  .login-card {
    padding: var(--spacing-2xl) var(--spacing-2xl);
  }
}

/* ============================================
   LARGE DESKTOP STYLES (1200px and up)
   ============================================ */
@media (min-width: 1200px) {
  :root {
    --sidebar-width: 280px;
  }

  .main-content {
    padding: var(--spacing-2xl) var(--spacing-2xl) var(--spacing-2xl) calc(var(--spacing-2xl) + 20px);
  }

  .stats-grid {
    grid-template-columns: repeat(3, 1fr);
    max-width: 1000px;
  }

  .chart-container {
    height: 400px;
  }
}

/* ============================================
   EXTRA LARGE DESKTOP (1600px and up)
   ============================================ */
@media (min-width: 1600px) {
  .main-content {
    padding: var(--spacing-2xl) 80px;
  }

  .main-content > * {
    max-width: 1400px;
  }
}

/* Print styles */
@media print {
  .bottom-nav,
  .app-header,
  .btn {
    display: none !important;
  }

  .main-content {
    margin-left: 0;
    padding: 0;
    max-width: 100%;
  }

  body {
    background: white;
  }
}

/* Smooth scroll */
html {
  scroll-behavior: smooth;
}

/* Selection color */
::selection {
  background: var(--primary-light);
  color: var(--primary-color);
}