/* ==========================================================================
   DESIGN TOKENS & ROOT VARIABLES
   ========================================================================== */
:root {
  --font-family: 'Outfit', 'Sarabun', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  
  /* Light Mode Palette */
  --bg-color: #f3f4f6;
  --bg-gradient: linear-gradient(135deg, #eef2f7 0%, #d5deea 100%);
  --panel-bg: rgba(255, 255, 255, 0.7);
  --panel-border: rgba(255, 255, 255, 0.4);
  --text-main: #1e293b;
  --text-muted: #64748b;
  
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-glow: rgba(99, 102, 241, 0.15);
  
  --success: #10b981;
  --success-hover: #059669;
  --success-glow: rgba(16, 185, 129, 0.15);
  
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --danger-glow: rgba(239, 68, 68, 0.15);
  
  --warning: #f59e0b;
  --warning-glow: rgba(245, 158, 11, 0.15);

  --accent-blue: #0ea5e9;
  --accent-purple: #a855f7;
  
  --card-shadow: 0 10px 30px 0 rgba(31, 38, 135, 0.06), 
                 0 1px 3px 0 rgba(0, 0, 0, 0.05);
  --input-border: #cbd5e1;
  --input-focus-border: #6366f1;
  --table-header-bg: rgba(241, 245, 249, 0.5);
  --table-row-hover: rgba(241, 245, 249, 0.4);
  
  --glass-blur: 15px;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  /* Dark Mode Palette */
  --bg-color: #0b0f19;
  --bg-gradient: linear-gradient(135deg, #0b0f17 0%, #111827 100%);
  --panel-bg: rgba(17, 24, 39, 0.65);
  --panel-border: rgba(255, 255, 255, 0.07);
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  
  --primary: #818cf8;
  --primary-hover: #6366f1;
  --primary-glow: rgba(129, 140, 248, 0.25);
  
  --success: #34d399;
  --success-hover: #10b981;
  --success-glow: rgba(52, 211, 153, 0.25);
  
  --danger: #f87171;
  --danger-hover: #ef4444;
  --danger-glow: rgba(248, 113, 113, 0.25);
  
  --warning: #fbbf24;
  --warning-glow: rgba(251, 191, 36, 0.25);
  
  --card-shadow: 0 10px 30px 0 rgba(0, 0, 0, 0.35);
  --input-border: #334155;
  --input-focus-border: #818cf8;
  --table-header-bg: rgba(30, 41, 59, 0.4);
  --table-row-hover: rgba(30, 41, 59, 0.3);
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  background-image: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text-main);
  min-height: 100vh;
  line-height: 1.6;
  position: relative;
  overflow-x: hidden;
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Glow Background Elements */
.glow-bg-1, .glow-bg-2 {
  position: fixed;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  filter: blur(100px);
  z-index: -1;
  opacity: 0.35;
  pointer-events: none;
  transition: background var(--transition-normal);
}

.glow-bg-1 {
  top: -100px;
  right: -50px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.4) 0%, rgba(168, 85, 247, 0.1) 70%);
}

.glow-bg-2 {
  bottom: -100px;
  left: -50px;
  background: radial-gradient(circle, rgba(16, 185, 129, 0.3) 0%, rgba(14, 165, 233, 0.1) 70%);
}

[data-theme="dark"] .glow-bg-1 {
  background: radial-gradient(circle, rgba(99, 102, 241, 0.25) 0%, rgba(168, 85, 247, 0.05) 70%);
}

[data-theme="dark"] .glow-bg-2 {
  background: radial-gradient(circle, rgba(52, 211, 153, 0.2) 0%, rgba(14, 165, 233, 0.05) 70%);
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: 10px;
  opacity: 0.3;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--primary);
}

/* ==========================================================================
   APP CONTAINER & HEADER
   ========================================================================== */
.app-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
  min-height: 100vh;
}

.app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 2rem;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  transition: background var(--transition-normal), border var(--transition-normal);
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logo-icon {
  width: 46px;
  height: 46px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent-purple) 100%);
  color: white;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
}

.logo-text h1 {
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.2;
}

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

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

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  text-decoration: none;
}

.btn-primary {
  background: var(--primary);
  color: white;
  box-shadow: 0 4px 14px var(--primary-glow);
}

.btn-primary:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--primary-glow);
}

.btn-outline {
  background: transparent;
  border-color: var(--input-border);
  color: var(--text-main);
}

.btn-outline:hover {
  background: var(--table-header-bg);
  border-color: var(--text-muted);
}

.btn-danger-outline {
  background: transparent;
  border: 1px solid var(--danger-glow);
  color: var(--danger);
  padding: 0.4rem 0.75rem;
  font-size: 0.85rem;
  border-radius: var(--radius-sm);
}

.btn-danger-outline:hover {
  background: var(--danger);
  color: white;
}

.btn-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: transparent;
  border: 1px solid var(--panel-border);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.1rem;
  transition: all var(--transition-fast);
}

.btn-icon:hover {
  background: var(--panel-bg);
  border-color: var(--primary);
  color: var(--primary);
  transform: scale(1.05);
}

/* ==========================================================================
   DASHBOARD CARDS
   ========================================================================== */
.dashboard-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.card {
  position: relative;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.75rem;
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  overflow: hidden;
  transition: transform var(--transition-normal), border var(--transition-normal), box-shadow var(--transition-normal);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 35px 0 rgba(31, 38, 135, 0.1);
}

.card-glow {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--primary);
}

.card-balance .card-glow {
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
}

.card-income .card-glow {
  background: var(--success);
}

.card-expense .card-glow {
  background: var(--danger);
}

.card-content {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.card-label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.card-value {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.card-footer {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* Color Classes */
.text-success { color: var(--success) !important; }
.text-danger { color: var(--danger) !important; }

/* ==========================================================================
   CHARTS SECTION
   ========================================================================== */
.charts-section {
  display: grid;
  grid-template-columns: 2fr 3fr;
  gap: 1.5rem;
}

.chart-card {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.chart-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.chart-wrapper {
  position: relative;
  flex-grow: 1;
  min-height: 280px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.chart-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  color: var(--text-muted);
  text-align: center;
}

.chart-placeholder i {
  font-size: 2.5rem;
  opacity: 0.4;
}

/* ==========================================================================
   TRANSACTIONS LIST & FILTERS
   ========================================================================== */
.transactions-section {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: var(--card-shadow);
  backdrop-filter: blur(var(--glass-blur));
  -webkit-backdrop-filter: blur(var(--glass-blur));
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.section-title-wrapper {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.section-title-wrapper h2 {
  font-size: 1.25rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.badge {
  background: var(--primary-glow);
  color: var(--primary);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.6rem;
  border-radius: 20px;
}

/* Filters UI */
.filters-container {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.search-box {
  position: relative;
  display: flex;
  align-items: center;
}

.search-box i {
  position: absolute;
  left: 1rem;
  color: var(--text-muted);
}

.search-box input {
  width: 100%;
  padding: 0.65rem 1rem 0.65rem 2.5rem;
  border: 1px solid var(--input-border);
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text-main);
  font-family: var(--font-family);
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--transition-fast);
}

.search-box input:focus {
  border-color: var(--input-focus-border);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

.filters-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.filter-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.filter-group label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

.filter-group select {
  padding: 0.65rem 1.5rem 0.65rem 1rem;
  border: 1px solid var(--input-border);
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text-main);
  font-family: var(--font-family);
  font-size: 0.9rem;
  outline: none;
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

[data-theme="dark"] .filter-group select option {
  background-color: var(--bg-color);
  color: var(--text-main);
}

.filter-group select:focus {
  border-color: var(--input-focus-border);
}

/* Table Design */
.table-container {
  overflow-x: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--panel-border);
}

.transaction-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

.transaction-table th, 
.transaction-table td {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--panel-border);
}

.transaction-table th {
  background: var(--table-header-bg);
  font-weight: 600;
  color: var(--text-muted);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

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

.transaction-table tbody tr:hover {
  background: var(--table-row-hover);
}

.transaction-table tbody tr:last-child td {
  border-bottom: none;
}

/* Badges for Categories and Types */
.type-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
}

.type-badge-income {
  background: var(--success-glow);
  color: var(--success);
}

.type-badge-expense {
  background: var(--danger-glow);
  color: var(--danger);
}

.category-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  color: var(--text-main);
}

.category-icon {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  color: white;
}

/* Empty State */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4rem 2rem;
  text-align: center;
  color: var(--text-muted);
}

.empty-icon {
  font-size: 3.5rem;
  margin-bottom: 1rem;
  opacity: 0.35;
}

.empty-state h3 {
  font-weight: 600;
  margin-bottom: 0.25rem;
  color: var(--text-main);
}

.empty-state p {
  font-size: 0.9rem;
}

.hidden {
  display: none !important;
}

/* ==========================================================================
   MODAL POPUP
   ========================================================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(15, 23, 42, 0.4);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-normal);
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  box-shadow: var(--card-shadow);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 520px;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  overflow: hidden;
  transform: translateY(20px) scale(0.95);
  transition: transform var(--transition-normal);
}

.modal-overlay.open .modal-card {
  transform: translateY(0) scale(1);
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--panel-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h2 {
  font-size: 1.2rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.btn-close {
  background: transparent;
  border: none;
  font-size: 1.75rem;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
  transition: color var(--transition-fast);
}

.btn-close:hover {
  color: var(--danger);
}

.modal-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.modal-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--panel-border);
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  background: var(--table-header-bg);
}

/* Form inputs & controls */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
}

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

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.input-icon {
  position: absolute;
  left: 1rem;
  color: var(--text-muted);
}

.input-wrapper input,
.input-wrapper select {
  width: 100%;
  padding: 0.75rem 1rem 0.75rem 2.5rem;
  border: 1px solid var(--input-border);
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text-main);
  font-family: var(--font-family);
  font-size: 0.95rem;
  outline: none;
  transition: all var(--transition-fast);
}

.input-wrapper select option {
  background: var(--bg-color);
  color: var(--text-main);
}

[data-theme="dark"] .input-wrapper select option {
  background-color: #1e293b;
}

.input-wrapper input:focus,
.input-wrapper select:focus {
  border-color: var(--input-focus-border);
  box-shadow: 0 0 0 3px var(--primary-glow);
}

/* Form Grid Layout */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

/* Radio buttons styled as nice toggle button tabs */
.type-selector-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
  background: var(--table-header-bg);
  padding: 0.25rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--panel-border);
}

.type-selector-wrapper input[type="radio"] {
  display: none;
}

.type-label {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.type-label:hover {
  color: var(--text-main);
}

.type-selector-wrapper input[type="radio"]:checked + .type-label {
  background: white;
  color: var(--text-main);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] .type-selector-wrapper input[type="radio"]:checked + .type-label {
  background: #334155;
}

.type-selector-wrapper input[type="radio"]#type-income:checked + .type-label-income {
  color: var(--success);
  border: 1px solid rgba(16, 185, 129, 0.2);
}

.type-selector-wrapper input[type="radio"]#type-expense:checked + .type-label-expense {
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.2);
}

/* Error validation states */
.error-msg {
  font-size: 0.8rem;
  color: var(--danger);
  display: none;
}

.form-group.has-error input,
.form-group.has-error select {
  border-color: var(--danger);
}

.form-group.has-error .error-msg {
  display: block;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.app-footer {
  margin-top: auto;
  text-align: center;
  padding: 2rem 0 1rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--panel-border);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.tech-tag {
  font-size: 0.75rem;
  opacity: 0.7;
}

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

@media (max-width: 768px) {
  body {
    padding: 0;
  }

  .app-container {
    padding: 1rem;
    gap: 1.25rem;
  }

  .app-header {
    padding: 1rem 1.25rem;
    border-radius: var(--radius-md);
  }

  .dashboard-cards {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .card {
    padding: 1.25rem 1.5rem;
  }

  .card-value {
    font-size: 1.85rem;
  }

  .filters-container {
    grid-template-columns: 1fr;
  }

  .filters-row {
    flex-direction: column;
    width: 100%;
  }

  .filter-group {
    justify-content: space-between;
    width: 100%;
  }

  .filter-group select {
    width: 70%;
  }
}

@media (max-width: 480px) {
  .form-grid {
    grid-template-columns: 1fr;
  }
}