/* ========================================
   BudgetPulse - Dark Theme Styles
   ======================================== */

/* CSS Custom Properties (Variables) */
:root {
  /* Dark theme colors */
  --bg-primary: #0f0f1a;
  --bg-secondary: #1a1a2e;
  --bg-card: #16213e;
  --bg-input: #1a1a2e;

  /* Text colors */
  --text-primary: #eaeaea;
  --text-secondary: #a0a0a0;
  --text-muted: #6c6c6c;

  /* Accent colors */
  --accent-primary: #4f46e5;
  --accent-primary-hover: #6366f1;
  --accent-secondary: #06b6d4;

  /* Status colors */
  --color-income: #10b981;
  --color-income-bg: rgba(16, 185, 129, 0.1);
  --color-expense: #ef4444;
  --color-expense-bg: rgba(239, 68, 68, 0.1);
  --color-warning: #f59e0b;
  --color-error: #ef4444;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);

  /* Border radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

/* Light theme colors */
[data-theme="light"] {
  --bg-primary: #f5f5f7;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-input: #f5f5f7;

  --text-primary: #1d1d1f;
  --text-secondary: #6e6e73;
  --text-muted: #86868b;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.15);
}

/* 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;
}

/* ========================================
   Header Styles
   ======================================== */
.app-header {
  background: linear-gradient(
    135deg,
    var(--bg-secondary) 0%,
    var(--bg-card) 100%
  );
  padding: var(--spacing-lg) var(--spacing-xl);
  text-align: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  position: relative;
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
}

.app-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
}

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

.app-tagline {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-top: var(--spacing-xs);
}

.theme-toggle {
  position: absolute;
  top: var(--spacing-lg);
  right: var(--spacing-xl);
  background: var(--bg-card);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--accent-secondary);
  font-size: 1.2rem;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.theme-toggle:hover {
  background: var(--accent-primary);
  color: white;
  transform: rotate(180deg) scale(1.1);
  box-shadow: var(--shadow-md);
}

.theme-toggle:active {
  transform: rotate(180deg) scale(0.95);
}

/* ========================================
   Main Layout
   ======================================== */
.app-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xl);
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
}

/* ========================================
   Card Styles
   ======================================== */
.card {
  background-color: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(255, 255, 255, 0.05);
  transition: box-shadow var(--transition-normal),
    transform var(--transition-normal);
}

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

.section-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.section-title i {
  color: var(--accent-secondary);
  transition: transform var(--transition-fast), color var(--transition-fast);
}

.card:hover .section-title i {
  transform: scale(1.1);
  color: var(--accent-primary);
}

/* ========================================
   Budget Panel Styles
   ======================================== */
.budget-controls {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.month-selector,
.budget-limit-input {
  flex: 1;
  min-width: 200px;
}

.month-selector label,
.budget-limit-input label {
  display: block;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
}

.month-input,
.budget-input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--bg-input);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 1rem;
  transition: border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.month-input:hover,
.budget-input:hover {
  border-color: rgba(255, 255, 255, 0.2);
}

.month-input:focus,
.budget-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

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

.currency-symbol {
  color: var(--text-secondary);
  font-weight: 500;
}

.budget-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--spacing-md);
}

.summary-item {
  background-color: var(--bg-secondary);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  text-align: center;
  transition: transform var(--transition-fast),
    background-color var(--transition-fast), box-shadow var(--transition-fast);
}

.summary-item:hover {
  transform: translateY(-2px);
  background-color: rgba(26, 26, 46, 0.8);
  box-shadow: var(--shadow-sm);
}

.summary-label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--spacing-xs);
}

.summary-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.summary-value.income {
  color: var(--color-income);
}

.summary-value.expense {
  color: var(--color-expense);
}

.summary-value.savings {
  color: var(--accent-secondary);
}

.budget-status {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
}

.budget-status.within {
  background-color: var(--color-income-bg);
  color: var(--color-income);
}

.budget-status.over {
  background-color: var(--color-expense-bg);
  color: var(--color-expense);
}

/* Status icon animation */
.budget-status i {
  transition: transform var(--transition-fast);
}

.budget-status:hover i {
  transform: scale(1.1);
}

/* ========================================
   Button Styles
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 0.875rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color var(--transition-fast),
    transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

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

.btn-primary:hover {
  background-color: var(--accent-primary-hover);
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.4);
}

.btn-danger {
  background-color: transparent;
  color: var(--color-expense);
  padding: var(--spacing-xs);
}

.btn-danger:hover {
  background-color: var(--color-expense-bg);
  transform: scale(1.1);
}

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

/* Icon hover effects */
.btn-danger i {
  transition: transform var(--transition-fast);
}

.btn-add {
  width: 100%;
  padding: var(--spacing-md);
  font-size: 1rem;
  margin-top: var(--spacing-md);
}

/* ========================================
   Form Styles
   ======================================== */
.transaction-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.form-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.form-group {
  flex: 1;
  min-width: 150px;
}

.form-group.flex-grow {
  flex: 2;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
}

.form-input {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--bg-input);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 1rem;
  transition: border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.form-input:hover {
  border-color: rgba(255, 255, 255, 0.2);
}

.form-input:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

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

.form-input.error {
  border-color: var(--color-error);
}

.error-message {
  display: block;
  font-size: 0.75rem;
  color: var(--color-error);
  margin-top: var(--spacing-xs);
  min-height: 1rem;
}

/* ========================================
   Transaction List Styles
   ======================================== */
.transaction-list-container {
  overflow-x: auto;
}

.transaction-table {
  width: 100%;
  border-collapse: collapse;
}

.transaction-table th,
.transaction-table td {
  padding: var(--spacing-md);
  text-align: left;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.transaction-table th {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background-color: var(--bg-secondary);
}

.transaction-table th:first-child {
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}

.transaction-table th:last-child {
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

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

.transaction-table tbody tr:hover {
  background-color: rgba(255, 255, 255, 0.02);
}

.transaction-type {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
}

.transaction-type.income {
  background-color: var(--color-income-bg);
  color: var(--color-income);
}

.transaction-type.expense {
  background-color: var(--color-expense-bg);
  color: var(--color-expense);
}

/* Transaction type icon styling */
.transaction-type i {
  font-size: 0.65rem;
}

.transaction-amount {
  font-weight: 600;
  font-family: "SF Mono", "Monaco", "Consolas", monospace;
}

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

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

.empty-message {
  text-align: center;
  color: var(--text-secondary);
  padding: var(--spacing-xl);
  font-style: italic;
}

/* ========================================
   Chart Section Styles
   ======================================== */
.chart-container {
  position: relative;
  height: 300px;
  width: 100%;
}

.chart-fallback {
  text-align: center;
  padding: var(--spacing-xl);
  color: var(--text-secondary);
}

/* ========================================
   Footer Styles
   ======================================== */
.app-footer {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-lg);
  color: var(--text-secondary);
  font-size: 0.875rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  background: var(--bg-secondary);
}

.footer-text {
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
}

.footer-text i {
  color: #ef4444;
  animation: heartbeat 1.5s ease-in-out infinite;
}

.footer-link {
  color: var(--accent-primary);
  text-decoration: none;
  font-weight: 600;
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--accent-secondary);
  text-decoration: underline;
}

.social-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  margin: var(--spacing-md) 0;
}

.social-link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 1.2rem;
  text-decoration: none;
  transition: all var(--transition-normal);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.social-link:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.social-link:nth-child(1):hover {
  background: #0077b5;
  color: white;
  border-color: #0077b5;
}

.social-link:nth-child(2):hover {
  background: linear-gradient(
    45deg,
    #f09433 0%,
    #e6683c 25%,
    #dc2743 50%,
    #cc2366 75%,
    #bc1888 100%
  );
  color: white;
  border-color: #bc1888;
}

.social-link:nth-child(3):hover {
  background: #ff0000;
  color: white;
  border-color: #ff0000;
}

.footer-copyright {
  margin-top: var(--spacing-md);
  color: var(--text-muted);
  font-size: 0.8rem;
}

@keyframes heartbeat {
  0%,
  100% {
    transform: scale(1);
  }
  25% {
    transform: scale(1.2);
  }
  50% {
    transform: scale(1);
  }
}

/* ========================================
   Responsive Design
   ======================================== */

/* Mobile First - Base styles for mobile (< 768px) */
/* All sections stack vertically by default */
.app-main {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  padding: var(--spacing-md);
}

/* Tablet (768px - 1023px) */
@media (min-width: 768px) {
  .app-main {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
    padding: var(--spacing-xl);
  }

  .budget-panel {
    grid-column: 1 / -1;
  }

  .transaction-form-section {
    grid-column: 1 / -1;
  }

  .chart-section {
    grid-column: 1 / -1;
  }

  .transaction-list-section {
    grid-column: 1 / -1;
  }
}

/* Desktop (1024px+) */
@media (min-width: 1024px) {
  .app-main {
    grid-template-columns: repeat(2, 1fr);
  }

  .budget-panel {
    grid-column: 1 / -1;
  }

  .transaction-form-section {
    grid-column: 1;
  }

  .chart-section {
    grid-column: 2;
  }

  .transaction-list-section {
    grid-column: 1 / -1;
  }
}

/* Mobile specific styles (< 768px) */
@media (max-width: 767px) {
  html {
    font-size: 14px;
  }

  .app-header {
    padding: var(--spacing-md);
  }

  .app-title {
    font-size: 1.5rem;
  }

  .card {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
  }

  .section-title {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-md);
  }

  /* Budget controls stack vertically */
  .budget-controls {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .month-selector,
  .budget-limit-input {
    min-width: 100%;
  }

  /* Input group adjustments for mobile */
  .input-group {
    flex-wrap: nowrap;
  }

  .budget-input {
    flex: 1;
    min-width: 0;
  }

  /* Budget summary 2x2 grid on mobile */
  .budget-summary {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-sm);
  }

  .summary-item {
    padding: var(--spacing-sm);
  }

  .summary-value {
    font-size: 1.1rem;
  }

  .summary-label {
    font-size: 0.65rem;
  }

  /* Form rows stack vertically */
  .form-row {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .form-group {
    min-width: 100%;
  }

  .form-group.flex-grow {
    flex: 1;
  }

  /* Transaction table adjustments */
  .transaction-table th,
  .transaction-table td {
    padding: var(--spacing-sm);
    font-size: 0.8rem;
  }

  .transaction-type {
    font-size: 0.65rem;
    padding: 2px 6px;
  }

  .transaction-amount {
    font-size: 0.85rem;
  }

  /* Chart container responsive height */
  .chart-container {
    height: 220px;
    min-height: 180px;
  }

  /* Button adjustments */
  .btn-add {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.9rem;
  }

  .btn-danger {
    padding: 4px;
  }

  /* Footer adjustments */
  .app-footer {
    padding: var(--spacing-md);
    font-size: 0.75rem;
  }
}

/* Small mobile (< 480px) */
@media (max-width: 480px) {
  html {
    font-size: 13px;
  }

  .app-main {
    padding: var(--spacing-sm);
    gap: var(--spacing-sm);
  }

  .app-header {
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .app-title {
    font-size: 1.3rem;
  }

  .app-tagline {
    font-size: 0.85rem;
  }

  .card {
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
  }

  /* Hide description column on very small screens */
  .transaction-table th:nth-child(2),
  .transaction-table td:nth-child(2) {
    display: none;
  }

  /* Compact table on very small screens */
  .transaction-table th,
  .transaction-table td {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
  }

  .transaction-table th:first-child,
  .transaction-table td:first-child {
    padding-left: var(--spacing-xs);
  }

  .transaction-table th:last-child,
  .transaction-table td:last-child {
    padding-right: var(--spacing-xs);
  }

  /* Smaller chart on very small screens */
  .chart-container {
    height: 180px;
    min-height: 150px;
  }

  /* Budget summary adjustments */
  .budget-summary {
    gap: var(--spacing-xs);
  }

  .summary-value {
    font-size: 1rem;
  }

  .budget-status {
    font-size: 0.7rem;
    padding: 2px 6px;
  }
}

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

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

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

.card {
  animation: fadeIn 0.3s ease-out;
}

/* Focus visible for accessibility */
:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

/* Custom scrollbar for webkit browsers */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}