/* ACShim Stylesheet */
:root {
  --color-primary: #2563EB;
  --color-primary-dark: #1E40AF;
  --color-primary-light: #DBEAFE;
  --color-accent: #F59E0B;
  --color-accent-dark: #D97706;
  --color-text: #1F2937;
  --color-text-light: #6B7280;
  --color-bg: #F9FAFB;
  --color-surface: #FFFFFF;
  --color-border: #E5E7EB;
  --color-success: #059669;
  --color-warning: #D97706;
  --color-error: #DC2626;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --max-width: 1200px;
  --transition: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

img, svg {
  max-width: 100%;
  height: auto;
}

/* Header */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--color-text);
  font-weight: 700;
  font-size: 1.25rem;
}
.logo:hover {
  text-decoration: none;
  color: var(--color-primary);
}

.site-nav {
  display: flex;
  gap: 1.5rem;
}

.site-nav a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-light);
}

.site-nav a:hover {
  color: var(--color-primary);
}

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: white;
  padding: 4rem 0 4.5rem;
  text-align: center;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.hero-sub {
  font-size: 1.15rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto 2rem;
  line-height: 1.5;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition);
  text-decoration: none;
  line-height: 1.4;
}

.btn:hover {
  text-decoration: none;
}

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

.btn-primary:hover {
  background: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: white;
}

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

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

.btn-lg {
  padding: 0.85rem 2rem;
  font-size: 1.05rem;
  border-radius: var(--radius-md);
}

/* Planner Section */
.planner-section {
  padding: 3rem 0;
}

.planner-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: start;
}

.planner-inputs h2,
.planner-results h2 {
  font-size: 1.4rem;
  margin-bottom: 1.5rem;
  color: var(--color-text);
}

/* Form Elements */
.form-group {
  border: none;
  margin-bottom: 1.75rem;
  padding: 0;
}

.form-group legend {
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 0.75rem;
  color: var(--color-text);
}

.field-hint {
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-bottom: 0.75rem;
}

.radio-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.5rem;
}

.radio-card {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0.75rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  background: var(--color-surface);
}

.radio-card:hover {
  border-color: var(--color-primary);
}

.radio-card input[type="radio"] {
  margin-top: 0.2rem;
  accent-color: var(--color-primary);
}

.radio-card input[type="radio"]:checked + .radio-label {
  color: var(--color-primary-dark);
}

.radio-card:has(input:checked) {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.radio-label {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.radio-label strong {
  font-size: 0.9rem;
}

.radio-label small {
  font-size: 0.78rem;
  color: var(--color-text-light);
}

.input-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.input-field {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

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

.input-field input,
.input-field select {
  padding: 0.6rem 0.75rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-family: var(--font-sans);
  background: var(--color-surface);
  color: var(--color-text);
  transition: border-color var(--transition);
}

.input-field input:focus,
.input-field select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.form-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

/* Results Panel */
.results-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.result-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
}

.result-card h3 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-light);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.5rem;
}

.result-value {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  line-height: 1.3;
}

.result-note {
  font-size: 0.8rem;
  color: var(--color-text-light);
  margin-top: 0.35rem;
}

.result-card-full {
  grid-column: 1 / -1;
}

.material-list {
  list-style: none;
  padding: 0;
}

.material-list li {
  padding: 0.4rem 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.9rem;
  display: flex;
  justify-content: space-between;
}

.material-list li:last-child {
  border-bottom: none;
}

.material-qty {
  font-weight: 600;
  color: var(--color-primary-dark);
}

#window-notes {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--color-text);
}

#window-notes ul {
  padding-left: 1.25rem;
  margin-top: 0.5rem;
}

#window-notes li {
  margin-bottom: 0.35rem;
}

/* Shim Template */
.shim-template {
  margin-top: 2rem;
  padding: 1.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  display: none;
}

.shim-template.visible {
  display: block;
}

.shim-template h3 {
  margin-bottom: 0.5rem;
}

.shim-template p {
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-bottom: 1rem;
}

.template-svg {
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: white;
}

/* Guide Section */
.guide-section {
  padding: 3rem 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.guide-section h2 {
  font-size: 1.6rem;
  text-align: center;
  margin-bottom: 2rem;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.guide-card {
  background: var(--color-bg);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  border: 1px solid var(--color-border);
}

.guide-step {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: var(--color-primary);
  color: white;
  border-radius: 50%;
  font-weight: 700;
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
}

.guide-card h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.guide-card p {
  font-size: 0.88rem;
  color: var(--color-text-light);
  line-height: 1.55;
}

.assumptions-block {
  background: #FEF3C7;
  border: 1px solid #FDE68A;
  border-radius: var(--radius-md);
  padding: 1.5rem;
}

.assumptions-block h3 {
  font-size: 1rem;
  margin-bottom: 0.75rem;
  color: #92400E;
}

.assumptions-block ul {
  padding-left: 1.25rem;
}

.assumptions-block li {
  font-size: 0.88rem;
  color: #78350F;
  margin-bottom: 0.3rem;
}

/* Mistakes Section */
.mistakes-section {
  padding: 3rem 0;
}

.mistakes-section h2 {
  font-size: 1.6rem;
  text-align: center;
  margin-bottom: 2rem;
}

.mistakes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.mistake-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-error);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  box-shadow: var(--shadow-sm);
}

.mistake-card h3 {
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
  color: var(--color-error);
}

.mistake-card p {
  font-size: 0.88rem;
  color: var(--color-text-light);
  line-height: 1.55;
}

/* Troubleshoot Section */
.troubleshoot-section {
  padding: 3rem 0;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.troubleshoot-section h2 {
  font-size: 1.6rem;
  text-align: center;
  margin-bottom: 2rem;
}

.troubleshoot-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.troubleshoot-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.troubleshoot-card summary {
  padding: 1rem 1.25rem;
  cursor: pointer;
  font-size: 0.95rem;
  transition: background var(--transition);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.troubleshoot-card summary::-webkit-details-marker {
  display: none;
}

.troubleshoot-card summary::before {
  content: '+';
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-primary);
  flex-shrink: 0;
}

.troubleshoot-card[open] summary::before {
  content: '−';
}

.troubleshoot-card summary:hover {
  background: var(--color-primary-light);
}

.troubleshoot-card p {
  padding: 0 1.25rem 1rem;
  font-size: 0.88rem;
  color: var(--color-text-light);
  line-height: 1.55;
}

/* FAQ Section */
.faq-section {
  padding: 3rem 0;
}

.faq-section h2 {
  font-size: 1.6rem;
  text-align: center;
  margin-bottom: 2rem;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-list dt {
  font-weight: 700;
  font-size: 1rem;
  margin-top: 1.5rem;
  margin-bottom: 0.4rem;
  color: var(--color-text);
}

.faq-list dd {
  font-size: 0.9rem;
  color: var(--color-text-light);
  line-height: 1.6;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--color-border);
}

/* Footer */
.site-footer {
  background: var(--color-text);
  color: #9CA3AF;
  padding: 2rem 0;
  font-size: 0.85rem;
}

.footer-grid {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-meta {
  font-size: 0.8rem;
  margin-top: 0.25rem;
}

.footer-nav {
  display: flex;
  gap: 1.5rem;
}

.footer-nav a {
  color: #9CA3AF;
}

.footer-nav a:hover {
  color: white;
}

/* Print Styles */
@media print {
  .site-header,
  .site-footer,
  .hero,
  .guide-section,
  .mistakes-section,
  .troubleshoot-section,
  .faq-section,
  .form-actions,
  #planner .planner-inputs {
    display: none !important;
  }

  .planner-section {
    padding: 0;
  }

  .planner-grid {
    display: block;
  }

  .shim-template {
    display: block !important;
    page-break-before: always;
  }

  .result-card {
    break-inside: avoid;
  }
}

/* Responsive */
@media (max-width: 900px) {
  .planner-grid {
    grid-template-columns: 1fr;
  }

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

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

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

  .hero h1 {
    font-size: 2rem;
  }
}

@media (max-width: 600px) {
  .site-header .container {
    flex-direction: column;
    height: auto;
    padding: 0.75rem 1rem;
    gap: 0.5rem;
  }

  .site-nav {
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
  }

  .hero {
    padding: 2.5rem 0 3rem;
  }

  .hero h1 {
    font-size: 1.6rem;
  }

  .hero-sub {
    font-size: 1rem;
  }

  .radio-group {
    grid-template-columns: 1fr;
  }

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

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

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

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

  .form-actions {
    flex-direction: column;
  }

  .form-actions .btn {
    width: 100%;
  }

  .footer-grid {
    flex-direction: column;
    text-align: center;
  }
}

/* Focus styles for accessibility */
:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html {
    scroll-behavior: auto;
  }
}

/* Screen reader only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}



/* Factory-injected deployment helpers. The AI owns the site design above this block. */
.ad-unit {
  width: min(100%, 720px);
  min-height: 120px;
  margin: 24px auto;
  display: block;
}

.legal-page {
  width: min(900px, calc(100% - 32px));
  margin: 40px auto;
}

.factory-fallback-nav {
  width: min(900px, calc(100% - 32px));
  margin: 24px auto 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  font-size: 0.95rem;
}

.factory-fallback-nav a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}