/* ==========================================
   MORTGAGE CALCULATOR - MODERN SAAS DESIGN
   ========================================== */

/* CSS Variables for Theming */
:root {
  /* Colors - Light Mode */
  --primary-color: #3b82f6;
  --primary-hover: #2563eb;
  --secondary-color: #64748b;
  --secondary-hover: #475569;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --danger-color: #ef4444;
  --info-color: #06b6d4;
  
  /* Grays */
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;
  
  /* Backgrounds */
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  
  /* Text */
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-tertiary: #64748b;
  --text-inverse: #ffffff;
  
  /* Borders */
  --border-color: #e2e8f0;
  --border-hover: #cbd5e1;
  --border-focus: #3b82f6;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.75rem;
  --radius-2xl: 1rem;
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode Variables */
[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  
  --text-primary: #f8fafc;
  --text-secondary: #e2e8f0;
  --text-tertiary: #cbd5e1;
  --text-inverse: #0f172a;
  
  --border-color: #334155;
  --border-hover: #475569;
  --border-focus: #60a5fa;
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4), 0 2px 4px -2px rgb(0 0 0 / 0.4);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.4), 0 4px 6px -4px rgb(0 0 0 / 0.4);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.5), 0 8px 10px -6px rgb(0 0 0 / 0.5);
}

/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 1.875rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

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

/* Layout Components */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* Header */
.header {
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  background-color: rgba(255, 255, 255, 0.9);
}

[data-theme="dark"] .header {
  background-color: rgba(15, 23, 42, 0.9);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary-color);
}

.logo i {
  font-size: 1.5rem;
}

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

.currency-select,
.language-select,
.dark-mode-toggle {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-size: 0.875rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.currency-select:hover,
.language-select:hover,
.dark-mode-toggle:hover {
  border-color: var(--border-hover);
  background-color: var(--bg-secondary);
}

.dark-mode-toggle {
  padding: var(--spacing-sm);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Advertisement Banners */
.ad-banner-top,
.ad-banner-bottom {
  background-color: var(--bg-tertiary);
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--border-color);
}

.ad-banner-bottom {
  border-bottom: none;
  border-top: 1px solid var(--border-color);
}

.ad-container {
  text-align: center;
  padding: var(--spacing-xl);
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-lg);
  background-color: var(--bg-secondary);
}

.ad-text {
  color: var(--text-tertiary);
  font-size: 0.875rem;
  margin: 0;
}

.ad-space-sidebar .ad-container {
  margin: var(--spacing-lg) 0;
  padding: var(--spacing-lg);
}

/* Main Content */
.main {
  min-height: calc(100vh - 80px);
  padding: var(--spacing-2xl) 0;
}

/* Hero Section */
.hero {
  text-align: center;
  margin-bottom: var(--spacing-3xl);
}

.hero-title {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.hero-subtitle {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
}

/* Calculator Layout */
.calculator-layout {
  display: grid;
  grid-template-columns: 1fr 400px;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-3xl);
}

/* Cards */
.card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  overflow: hidden;
  transition: all var(--transition-normal);
}

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

.card-header {
  padding: var(--spacing-lg);
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.card-header h2 {
  margin: 0;
  font-size: 1.25rem;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

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

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

.form-group label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
  color: var(--text-primary);
}

.form-control {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-size: 1rem;
  transition: all var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-control:read-only {
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
}

/* Input Groups */
.input-group {
  position: relative;
  display: flex;
  align-items: center;
}

.input-prefix,
.input-suffix {
  position: absolute;
  padding: 0 var(--spacing-md);
  color: var(--text-tertiary);
  font-weight: 500;
  pointer-events: none;
}

.input-prefix {
  left: 0;
}

.input-suffix {
  right: 0;
}

.input-group .form-control {
  padding-left: calc(var(--spacing-md) + 1rem);
  padding-right: calc(var(--spacing-md) + 1rem);
}

.input-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--spacing-sm);
}

/* Advanced Options */
.advanced-toggle {
  margin-bottom: var(--spacing-md);
}

.advanced-options {
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-color);
  transition: all var(--transition-normal);
}

.advanced-options.hidden {
  display: none;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary {
  background-color: var(--primary-color);
  color: var(--text-inverse);
  border-color: var(--primary-color);
}

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

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

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

.btn-outline {
  background-color: transparent;
  color: var(--primary-color);
  border-color: var(--primary-color);
}

.btn-outline:hover:not(:disabled) {
  background-color: var(--primary-color);
  color: var(--text-inverse);
}

.btn-link {
  background-color: transparent;
  color: var(--primary-color);
  border: none;
  padding: var(--spacing-sm);
}

.btn-link:hover:not(:disabled) {
  color: var(--primary-hover);
}

.btn-block {
  width: 100%;
}

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: 0.75rem;
}

/* Results Panel */
.results-panel {
  position: relative;
}

.results-sticky {
  position: sticky;
  top: 120px;
}

.results-card {
  margin-bottom: var(--spacing-lg);
}

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

.monthly-payment .currency {
  font-size: 1.5rem;
  color: var(--text-secondary);
  vertical-align: top;
}

.monthly-payment .amount {
  font-size: 3rem;
  font-weight: 700;
  color: var(--primary-color);
}

.monthly-payment .period {
  font-size: 1rem;
  color: var(--text-secondary);
}

.payment-breakdown {
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-md);
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
}

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

.breakdown-item:last-child {
  margin-bottom: 0;
}

.breakdown-item .label {
  color: var(--text-secondary);
}

.breakdown-item .value {
  font-weight: 500;
}

.results-summary {
  border-top: 1px solid var(--border-color);
  padding-top: var(--spacing-md);
}

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

.summary-item:last-child {
  margin-bottom: 0;
}

.summary-item .label {
  color: var(--text-secondary);
}

.summary-item .value {
  font-weight: 600;
}

/* CTA Section */
.cta-section {
  margin-bottom: var(--spacing-lg);
}

.cta-section .btn {
  margin-bottom: var(--spacing-sm);
}

.cta-section .btn:last-child {
  margin-bottom: 0;
}

/* Email Capture */
.email-capture {
  background-color: var(--bg-secondary);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  text-align: center;
}

.email-capture h3 {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-sm);
}

.email-capture p {
  font-size: 0.875rem;
  margin-bottom: var(--spacing-md);
}

.email-capture input[type="email"] {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
  background-color: var(--bg-primary);
  color: var(--text-primary);
}

/* Scenario Controls */
.scenario-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.scenario-results {
  padding: var(--spacing-md);
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
}

.scenario-comparison {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--spacing-sm);
}

.scenario-comparison:last-child {
  margin-bottom: 0;
}

.scenario-comparison .label {
  color: var(--text-secondary);
}

.scenario-comparison .current {
  color: var(--text-primary);
}

.scenario-comparison .scenario {
  color: var(--success-color);
  font-weight: 600;
}

.savings {
  color: var(--success-color);
  font-weight: 600;
}

.cost {
  color: var(--danger-color);
  font-weight: 600;
}

/* Charts Section */
.charts-section {
  margin-bottom: var(--spacing-3xl);
}

.charts-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
}

.charts-grid .card {
  height: 400px;
}

.charts-grid canvas {
  max-height: 300px;
}

/* Amortization Section */
.amortization-section {
  margin-bottom: var(--spacing-3xl);
}

.amortization-content.hidden {
  display: none;
}

.amortization-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
}

.view-toggle {
  display: flex;
  gap: var(--spacing-xs);
}

.view-toggle .btn {
  border-radius: var(--radius-sm);
}

.table-container {
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
}

.amortization-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

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

.amortization-table th {
  background-color: var(--bg-secondary);
  font-weight: 600;
  color: var(--text-primary);
}

.amortization-table tbody tr:hover {
  background-color: var(--bg-secondary);
}

.amortization-table .payment-number {
  font-weight: 500;
}

.amortization-table .payment-amount {
  font-weight: 600;
}

.amortization-table .principal {
  color: var(--success-color);
}

.amortization-table .interest {
  color: var(--danger-color);
}

.amortization-table .balance {
  font-weight: 600;
}

/* Examples Section */
.examples-section {
  margin-bottom: var(--spacing-3xl);
}

.examples-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
}

.example-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  text-align: center;
  cursor: pointer;
  transition: all var(--transition-normal);
}

.example-card:hover {
  border-color: var(--primary-color);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.example-card h3 {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.example-card p {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-sm);
}

.example-rate {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-sm);
  background-color: var(--primary-color);
  color: var(--text-inverse);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 500;
}

/* Footer */
.footer {
  background-color: var(--bg-primary);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.footer-section h3,
.footer-section h4 {
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: var(--spacing-sm);
}

.footer-section a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-section a:hover {
  color: var(--primary-color);
}

.footer-bottom {
  text-align: center;
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--border-color);
  color: var(--text-secondary);
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
}

.modal-content {
  background-color: var(--bg-primary);
  margin: 10% auto;
  padding: var(--spacing-2xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  width: 90%;
  max-width: 500px;
  position: relative;
}

.close {
  position: absolute;
  right: var(--spacing-lg);
  top: var(--spacing-lg);
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-secondary);
}

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

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

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

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

.text-success {
  color: var(--success-color);
}

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

.text-muted {
  color: var(--text-tertiary);
}

.font-weight-bold {
  font-weight: 700;
}

.font-weight-semibold {
  font-weight: 600;
}

/* Responsive Design */
@media (max-width: 1024px) {
  .calculator-layout {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }
  
  .results-sticky {
    position: relative;
    top: 0;
  }
  
  .charts-grid {
    grid-template-columns: 1fr;
  }
  
  .examples-grid {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-md);
  }
  
  .hero-title {
    font-size: 2rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .header-content {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .header-controls {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .input-grid {
    grid-template-columns: 1fr;
  }
  
  .scenario-controls {
    grid-template-columns: 1fr;
  }
  
  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .monthly-payment .amount {
    font-size: 2rem;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 1.75rem;
  }
  
  .card-body {
    padding: var(--spacing-md);
  }
  
  .examples-grid {
    grid-template-columns: 1fr;
  }
  
  .amortization-table {
    font-size: 0.75rem;
  }
  
  .amortization-table th,
  .amortization-table td {
    padding: var(--spacing-xs);
  }
}

/* Print Styles */
@media print {
  .header,
  .footer,
  .ad-banner-top,
  .ad-banner-bottom,
  .ad-space-sidebar,
  .cta-section,
  .email-capture,
  .dark-mode-toggle,
  .currency-select,
  .language-select {
    display: none !important;
  }
  
  body {
    background-color: white;
    color: black;
  }
  
  .card {
    box-shadow: none;
    border: 1px solid #ccc;
  }
  
  .main {
    padding: 0;
  }
}