/* Amortization Calculator - Calculator.net Inspired Modern Design */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Plus+Jakarta+Sans:wght@500;600;700;800&display=swap');

:root {
  --bg-main: #0f172a;
  --bg-card: rgba(30, 41, 59, 0.85);
  --bg-card-border: rgba(255, 255, 255, 0.1);
  --bg-input: #1e293b;
  --bg-input-border: #334155;
  
  --primary: #0284c7;
  --primary-hover: #0369a1;
  --primary-light: rgba(2, 132, 199, 0.15);
  
  --accent-green: #16a34a;
  --accent-green-dark: #15803d;
  --accent-lime: #84cc16;
  --accent-maroon: #881337;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  
  --shadow-card: 0 10px 25px -5px rgba(0, 0, 0, 0.4);
  --transition: all 0.2s ease-in-out;
}

[data-theme="light"] {
  --bg-main: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-border: #e2e8f0;
  --bg-input: #f1f5f9;
  --bg-input-border: #cbd5e1;
  
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-dim: #94a3b8;
  
  --shadow-card: 0 4px 20px -2px rgba(0, 0, 0, 0.06);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  min-height: 100vh;
}

h1, h2, h3, h4 {
  font-family: 'Plus Jakarta Sans', sans-serif;
  color: var(--text-main);
}

/* Header Navigation Bar */
.app-header {
  background: rgba(15, 23, 42, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--bg-card-border);
  padding: 0.85rem 1rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-container {
  max-width: 1300px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
}

.brand-logo {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-main);
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.nav-actions {
  display: flex;
  gap: 0.5rem;
  flex-shrink: 0;
}

/* Main Container */
.app-main {
  max-width: 1300px;
  margin: 0 auto;
  padding: 1.5rem;
}

.page-title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

.sub-banner {
  background: var(--primary);
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

/* Presets Bar */
.preset-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
  align-items: center;
}

.preset-btn {
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  color: var(--text-main);
  padding: 0.4rem 0.85rem;
  border-radius: 9999px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}

.preset-btn:hover, .preset-btn.active {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* Calculator Main Grid */
.calculator-grid {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

@media (max-width: 900px) {
  .calculator-grid {
    grid-template-columns: 1fr;
  }
}

/* Cards */
.card {
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
  margin-bottom: 1.5rem;
  overflow: hidden;
}

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

.form-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
}

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

.input-prefix, .input-suffix {
  position: absolute;
  color: var(--text-dim);
  font-size: 0.9rem;
  font-weight: 600;
  pointer-events: none;
}
.input-prefix { left: 0.85rem; }
.input-suffix { right: 0.85rem; }

.form-control {
  width: 100%;
  background: var(--bg-input);
  border: 1px solid var(--bg-input-border);
  color: var(--text-main);
  padding: 0.55rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 600;
  transition: var(--transition);
}
.form-control.has-prefix { padding-left: 1.8rem; }
.form-control.has-suffix { padding-right: 2.2rem; }

.form-control:focus {
  outline: none;
  border-color: var(--primary);
}

.checkbox-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  margin-top: 0.75rem;
}

.checkbox-group input {
  accent-color: var(--primary);
  width: 16px;
  height: 16px;
}

/* Action Buttons */
.btn-row {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.btn {
  background: var(--accent-green);
  color: #fff;
  border: none;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  transition: var(--transition);
  flex: 1;
}

.btn:hover {
  background: var(--accent-green-dark);
}

.btn-secondary {
  background: var(--bg-input);
  color: var(--text-main);
  border: 1px solid var(--bg-input-border);
  font-weight: 600;
}
.btn-secondary:hover {
  background: var(--bg-card-border);
}

.btn-sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
  flex: none;
}

/* Hero Monthly Payment Card (Calculator.net Banner Style) */
.hero-payment-card {
  background: linear-gradient(135deg, #15803d, #166534);
  color: #fff;
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
  box-shadow: 0 4px 15px rgba(22, 163, 74, 0.3);
}

.hero-payment-title {
  font-size: 1.1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  opacity: 0.9;
}

.hero-payment-value {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

/* Results Split Grid */
.results-split {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 1.25rem;
  align-items: center;
}

.summary-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.summary-table td {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--bg-card-border);
}

.summary-table td:last-child {
  text-align: right;
  font-weight: 700;
}

.chart-box {
  height: 180px;
  position: relative;
  min-width: 0;
}

/* Schedule & Line Chart Side-by-Side */
.schedule-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.schedule-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.schedule-controls-right {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}

.table-responsive {
  max-height: 420px;
  overflow-y: auto;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-sm);
}

.schedule-table {
  width: 100%;
  min-width: 360px;
  border-collapse: collapse;
  font-size: 0.85rem;
  text-align: right;
}

.schedule-table th {
  position: sticky;
  top: 0;
  background: var(--bg-input);
  color: var(--text-muted);
  padding: 0.65rem 0.75rem;
  border-bottom: 2px solid var(--bg-card-border);
  white-space: nowrap;
}

.schedule-table th:first-child, .schedule-table td:first-child {
  text-align: left;
}

.schedule-table td {
  padding: 0.55rem 0.75rem;
  border-bottom: 1px solid var(--bg-card-border);
  white-space: nowrap;
}

.line-chart-container {
  height: 380px;
  position: relative;
  min-width: 0;
}

.toggle-group {
  display: flex;
  background: var(--bg-input);
  padding: 0.2rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--bg-input-border);
}

.toggle-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 0.3rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  border-radius: 4px;
  white-space: nowrap;
}

.toggle-btn.active {
  background: var(--primary);
  color: #fff;
}

/* --- RESPONSIVE BREAKPOINTS --- */

/* Tablets & small laptops */
@media (max-width: 1024px) {
  .schedule-section {
    grid-template-columns: 1fr;
  }

  .line-chart-container {
    height: 300px;
  }
}

/* Medium phones / tablets portrait */
@media (max-width: 768px) {
  .app-main {
    padding: 1rem;
  }

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

  .calculator-grid {
    grid-template-columns: 1fr;
  }

  .results-split {
    grid-template-columns: 1fr;
  }

  .chart-box {
    height: 200px;
    margin-top: 1rem;
  }

  .hero-payment-value {
    font-size: 1.8rem;
  }

  .card {
    padding: 1rem;
  }

  .line-chart-container {
    height: 260px;
  }
}

/* Small phones */
@media (max-width: 480px) {
  .app-header {
    padding: 0.6rem 0.75rem;
  }

  .brand-logo {
    font-size: 0.9rem;
  }

  .brand-logo svg {
    width: 18px;
    height: 18px;
  }

  .page-title {
    font-size: 1.25rem;
  }

  .sub-banner {
    font-size: 0.78rem;
    padding: 0.4rem 0.75rem;
  }

  .preset-btn {
    font-size: 0.75rem;
    padding: 0.3rem 0.6rem;
  }

  .hero-payment-card {
    flex-direction: column;
    align-items: flex-start;
    padding: 1rem;
  }

  .hero-payment-value {
    font-size: 1.6rem;
  }

  .results-split {
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  .summary-table {
    font-size: 0.8rem;
  }

  .chart-box {
    height: 180px;
  }

  .schedule-controls {
    flex-direction: column;
    align-items: stretch;
  }

  .toggle-group {
    width: 100%;
  }

  .toggle-btn {
    flex: 1;
    text-align: center;
    font-size: 0.75rem;
  }

  .schedule-controls-right {
    width: 100%;
  }

  .schedule-controls-right input[type="text"] {
    flex: 1;
  }

  .table-responsive {
    max-height: 300px;
  }

  .schedule-table {
    font-size: 0.78rem;
    min-width: 320px;
  }

  .schedule-table th,
  .schedule-table td {
    padding: 0.4rem 0.5rem;
  }

  .line-chart-container {
    height: 220px;
  }

  .card {
    padding: 0.85rem;
    border-radius: var(--radius-md);
  }

  .footer-links {
    flex-direction: column;
    gap: 0.3rem;
  }

  .footer-sep {
    display: none;
  }

  .btn-row {
    flex-direction: column;
  }
}

/* SEO Educational Content Styling */
.seo-content {
  margin-top: 3rem;
  border-top: 1px solid var(--bg-card-border);
  padding-top: 2rem;
}

.seo-content h2 {
  font-size: 1.5rem;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  color: var(--text-main);
  border-bottom: 2px solid var(--primary-light);
  padding-bottom: 0.35rem;
}

.seo-content h3 {
  font-size: 1.15rem;
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
  color: var(--primary);
}

.seo-content p {
  color: var(--text-muted);
  margin-bottom: 1rem;
  font-size: 0.95rem;
  line-height: 1.7;
}

.seo-content ul, .seo-content ol {
  margin-left: 1.5rem;
  margin-bottom: 1rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.seo-content li {
  margin-bottom: 0.4rem;
}

.formula-box {
  background: var(--bg-input);
  border-left: 4px solid var(--primary);
  padding: 1rem 1.25rem;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin: 1.25rem 0;
  font-family: monospace;
  font-size: 1rem;
  color: var(--text-main);
  overflow-x: auto;
}

.seo-content dl {
  margin-bottom: 1.5rem;
}

.seo-content dt {
  font-weight: 700;
  color: var(--text-main);
  font-size: 1rem;
  margin-top: 1rem;
}

.seo-content dd {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-left: 1rem;
  margin-bottom: 0.75rem;
  line-height: 1.6;
}

.seo-content code {
  background: var(--bg-input);
  border: 1px solid var(--bg-input-border);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  color: #38bdf8;
  font-family: monospace;
  font-size: 0.9em;
}

/* Isolated SEO & E-E-A-T Content Block */
.seo-content-block {
  max-width: 100%;
  overflow-x: hidden;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

.seo-content-block a {
  color: #38bdf8;
  text-decoration: underline;
  text-underline-offset: 3px;
  font-weight: 500;
  transition: color 0.2s ease;
}

.seo-content-block a:hover {
  color: var(--primary);
}

.eeat-editorial-note {
  background: rgba(2, 132, 199, 0.1);
  border: 1px solid rgba(2, 132, 199, 0.3);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  margin-bottom: 2rem;
  font-size: 0.88rem;
}

.eeat-badge {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  color: var(--text-main);
}

.eeat-badge strong {
  display: block;
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
  color: var(--text-main);
}

.eeat-badge p {
  margin-bottom: 0;
  font-size: 0.88rem;
  line-height: 1.5;
}

.eeat-icon {
  font-size: 1.4rem;
  line-height: 1;
}

/* FAQ Accordion */
.faq-list {
  margin-top: 1rem;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--bg-card-border);
  border-radius: var(--radius-sm);
  margin-bottom: 0.75rem;
  overflow: hidden;
}

.faq-question {
  padding: 1rem 1.25rem;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
}

.faq-question span:first-child {
  flex: 1;
}

.faq-answer {
  padding: 0 1.25rem 1rem 1.25rem;
  display: none;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.faq-item.open .faq-answer {
  display: block;
}

/* Footer */
.app-footer {
  text-align: center;
  padding: 2rem 1rem;
  color: var(--text-dim);
  font-size: 0.85rem;
  border-top: 1px solid var(--bg-card-border);
  margin-top: 3rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.footer-links a {
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.footer-sep {
  color: var(--text-dim);
}

/* Print Optimization */
@media print {
  .app-header, .preset-bar, .sub-banner, .btn-row, .toggle-group, .seo-content, .app-footer {
    display: none !important;
  }
  body { background: #fff; color: #000; }
  .card, .hero-payment-card { background: #fff; border: 1px solid #ccc; color: #000; }
}