/* CSS Variables for theming */
:root {
  --bg-primary: #f5f7fa;
  --bg-secondary: #ffffff;
  --bg-tertiary: #e8ecf1;
  --text-primary: #1a1a2e;
  --text-secondary: #4a5568;
  --text-muted: #718096;
  --accent-primary: #4a90d9;
  --accent-secondary: #38b2ac;
  --accent-success: #48bb78;
  --accent-warning: #ed8936;
  --accent-danger: #f56565;
  --border-color: #e2e8f0;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all 0.3s ease;
}

[data-theme="dark"] {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-tertiary: #0f3460;
  --text-primary: #e8e8e8;
  --text-secondary: #a0aec0;
  --text-muted: #718096;
  --accent-primary: #5a9fe9;
  --accent-secondary: #4fd1c5;
  --accent-success: #68d391;
  --accent-warning: #fbd38d;
  --accent-danger: #fc8181;
  --border-color: #2d3748;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.4);
}

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

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

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

/* Header */
.header {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: white;
  padding: 1.5rem;
  text-align: center;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-lg);
}

.header-title-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}

.header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.share-btn {
  background: rgba(255, 255, 255, 0.2);
  border: none;
  color: white;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  margin-bottom: 0.25rem;
}

.share-btn:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: scale(1.1);
}

.share-btn:active {
  transform: scale(0.95);
}

.header-controls-wrapper {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1rem;
  position: relative;
  width: 100%;
}

.header-controls {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
}

.other-apps-btn {
  position: absolute;
  right: 0;
  text-decoration: none;
}

.header-btn {
  background: rgba(255, 255, 255, 0.2);
  border: none;
  color: white;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.875rem;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.header-btn:hover {
  background: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

/* Main container */
.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 1.5rem;
}

/* Cards */
.card {
  background: var(--bg-secondary);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

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

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Summary Stats */
.summary-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
}

.stat-card {
  background: var(--bg-tertiary);
  padding: 1.25rem;
  border-radius: var(--radius-sm);
  text-align: center;
  transition: var(--transition);
}

.stat-card:hover {
  transform: translateY(-3px);
}

.stat-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
}

.stat-value.income { color: var(--accent-success); }
.stat-value.expense { color: var(--accent-danger); }
.stat-value.balance { color: var(--accent-primary); }

/* Forms */
.form-group {
  margin-bottom: 1rem;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
}

label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

input, select, textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  background: var(--bg-secondary);
  color: var(--text-primary);
  transition: var(--transition);
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(74, 144, 217, 0.2);
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.btn-primary {
  background: var(--accent-primary);
  color: white;
}

.btn-primary:hover {
  background: #3a7fc9;
  transform: translateY(-2px);
}

.btn-success {
  background: var(--accent-success);
  color: white;
}

.btn-success:hover {
  background: #38a169;
}

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

.btn-danger:hover {
  background: #e53e3e;
}

.btn-secondary {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background: var(--border-color);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
}

.btn-block {
  width: 100%;
}

/* Transaction List */
.transaction-list {
  max-height: 400px;
  overflow-y: auto;
}

.transaction-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem;
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

.transaction-item:hover {
  background: var(--bg-tertiary);
}

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

.transaction-info {
  flex: 1;
}

.transaction-description {
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.transaction-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
  display: flex;
  gap: 1rem;
}

.transaction-amount {
  font-weight: 700;
  font-size: 1.125rem;
  margin-right: 1rem;
}

.transaction-amount.income { color: var(--accent-success); }
.transaction-amount.expense { color: var(--accent-danger); }

.delete-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.5rem;
  border-radius: 50%;
  transition: var(--transition);
}

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

/* Charts */
.chart-container {
  position: relative;
  height: 300px;
  margin-top: 1rem;
}

/* Budget Table */
.budget-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 1rem;
}

.budget-table th,
.budget-table td {
  padding: 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.budget-table th {
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.budget-table input {
  width: 100px;
  padding: 0.5rem;
}

.progress-bar {
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: 4px;
  overflow: hidden;
  min-width: 100px;
}

.progress-fill {
  height: 100%;
  border-radius: 4px;
  transition: width 0.5s ease;
}

.progress-fill.green { background: var(--accent-success); }
.progress-fill.yellow { background: var(--accent-warning); }
.progress-fill.red { background: var(--accent-danger); }

/* Categories */
.category-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.category-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--bg-tertiary);
  border-radius: 20px;
  font-size: 0.875rem;
}

.category-tag button {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0;
  font-size: 1rem;
  line-height: 1;
}

.category-tag button:hover {
  color: var(--accent-danger);
}

/* Alerts */
.alert {
  padding: 1rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.alert-warning {
  background: rgba(237, 137, 54, 0.15);
  border-left: 4px solid var(--accent-warning);
  color: var(--accent-warning);
}

.alert-danger {
  background: rgba(245, 101, 101, 0.15);
  border-left: 4px solid var(--accent-danger);
  color: var(--accent-danger);
}

.alert-success {
  background: rgba(72, 187, 120, 0.15);
  border-left: 4px solid var(--accent-success);
  color: var(--accent-success);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  padding: 1rem 1.5rem;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  box-shadow: var(--shadow-lg);
  animation: slideIn 0.3s ease;
  max-width: 350px;
}

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

/* Tabs */
.tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 0.5rem;
}

.tab {
  padding: 0.75rem 1.5rem;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  font-weight: 500;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  transition: var(--transition);
}

.tab:hover {
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

.tab.active {
  color: var(--accent-primary);
  border-bottom: 2px solid var(--accent-primary);
  margin-bottom: -2px;
}

/* Filter Section */
.filter-section {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
  padding: 1rem;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
}

/* Data Management Buttons */
.data-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 3rem;
  color: var(--text-muted);
}

.empty-state svg {
  width: 64px;
  height: 64px;
  margin-bottom: 1rem;
  opacity: 0.5;
}

/* Responsive */
@media (max-width: 768px) {
  .header h1 {
    font-size: 1.5rem;
  }

  .container {
    padding: 1rem;
  }

  .card {
    padding: 1rem;
  }

  .summary-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .transaction-item {
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .budget-table {
    display: block;
    overflow-x: auto;
  }

  .chart-container {
    height: 250px;
  }

  .header-controls {
    flex-wrap: wrap;
  }

  .header-controls-wrapper {
    flex-direction: column;
    gap: 0.75rem;
  }

  .other-apps-btn {
    position: static;
  }

  .filter-section {
    grid-template-columns: 1fr;
  }
}

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

  .stat-value {
    font-size: 1.25rem;
  }

  .tabs {
    overflow-x: auto;
  }

  .tab {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
  }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}

/* Focus visible for keyboard navigation */
button:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

/* Print styles */
@media print {
  .header-controls,
  .btn,
  .delete-btn {
    display: none;
  }

  .card {
    break-inside: avoid;
    box-shadow: none;
    border: 1px solid #ddd;
  }
}

/* ========== User Guide Styles ========== */

.guide-section {
  scroll-margin-top: 100px;
}

.guide-toc {
  background: var(--bg-tertiary);
  padding: 1.25rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
}

.guide-toc h3 {
  margin-bottom: 0.75rem;
  font-size: 1rem;
}

.guide-toc ul {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.5rem;
}

.guide-toc a {
  color: var(--accent-primary);
  text-decoration: none;
  font-size: 0.9rem;
  display: block;
  padding: 0.35rem 0;
  transition: var(--transition);
}

.guide-toc a:hover {
  color: var(--accent-secondary);
  padding-left: 0.5rem;
}

.guide-heading {
  font-size: 1.25rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--border-color);
  color: var(--text-primary);
}

.guide-steps {
  margin: 1.5rem 0;
}

.guide-step {
  display: flex;
  gap: 1rem;
  margin-bottom: 1.25rem;
  align-items: flex-start;
}

.step-number {
  background: var(--accent-primary);
  color: white;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
}

.guide-step strong {
  display: block;
  margin-bottom: 0.25rem;
}

.guide-step p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin: 0;
}

.guide-list {
  margin: 1rem 0;
  padding-left: 1.5rem;
}

.guide-list li {
  margin-bottom: 0.75rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

.guide-list li strong {
  color: var(--text-primary);
}

.guide-list ul {
  margin-top: 0.5rem;
  margin-bottom: 0;
}

.guide-section h4 {
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
  font-size: 1rem;
}

.guide-tip {
  background: rgba(72, 187, 120, 0.1);
  border-left: 4px solid var(--accent-success);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}

.guide-warning {
  background: rgba(245, 101, 101, 0.1);
  border-left: 4px solid var(--accent-danger);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}

.guide-tip-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.guide-tip-card {
  background: var(--bg-tertiary);
  padding: 1.25rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.guide-tip-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.guide-tip-card h4 {
  margin: 0 0 0.5rem 0;
  font-size: 1rem;
}

.guide-tip-card p {
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.5;
}

/* FAQ Accordion */
.faq-item {
  border-bottom: 1px solid var(--border-color);
  padding: 0;
}

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

.faq-item summary {
  padding: 1rem 0;
  cursor: pointer;
  font-weight: 500;
  color: var(--text-primary);
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: var(--transition);
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: '+';
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--accent-primary);
  transition: var(--transition);
}

.faq-item[open] summary::after {
  content: '-';
}

.faq-item summary:hover {
  color: var(--accent-primary);
}

.faq-item p {
  padding: 0 0 1rem 0;
  margin: 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* Guide responsive */
@media (max-width: 768px) {
  .guide-toc ul {
    grid-template-columns: 1fr;
  }

  .guide-tip-grid {
    grid-template-columns: 1fr;
  }

  .guide-step {
    flex-direction: column;
    gap: 0.5rem;
  }
}