/* FencePostCalc - Custom Styles */
:root {
  --color-primary: #2D5016;
  --color-primary-light: #4A7C23;
  --color-primary-dark: #1B3009;
  --color-accent: #D4A84B;
  --color-accent-dark: #B8922F;
  --color-bg: #FAFAF7;
  --color-surface: #FFFFFF;
  --color-surface-alt: #F5F5F0;
  --color-text: #2C2C2C;
  --color-text-muted: #6B6B6B;
  --color-border: #E0E0D8;
  --color-success: #388E3C;
  --color-error: #D32F2F;
  --color-info: #1565C0;
  --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);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --max-width: 1200px;
}

*, *::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);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--color-primary-light);
}

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;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary-dark);
}

.logo-accent {
  color: var(--color-primary-light);
}

.site-nav {
  display: flex;
  gap: 24px;
}

.site-nav a {
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 8px 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s, color 0.2s;
}

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

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-primary-light) 100%);
  color: white;
  padding: 80px 0;
  text-align: center;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 16px;
  line-height: 1.2;
}

.hero-sub {
  font-size: 1.2rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto 32px;
}

.btn-primary {
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-primary-dark);
  font-weight: 700;
  font-size: 1.1rem;
  padding: 14px 32px;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  background: var(--color-accent-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  color: var(--color-primary-dark);
}

.btn-secondary {
  display: inline-block;
  background: var(--color-surface);
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--color-primary);
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

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

/* Calculator Section */
.calculator-section {
  padding: 60px 0;
  background: var(--color-surface);
}

.calc-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}

.calc-inputs h2,
.calc-results h2 {
  font-size: 1.5rem;
  margin-bottom: 24px;
  color: var(--color-primary-dark);
}

/* Presets */
.presets {
  margin-bottom: 24px;
}

.field-label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--color-text);
}

.preset-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.preset-btn {
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s;
}

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

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

/* Form Fields */
.field {
  margin-bottom: 20px;
}

.field label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-text);
}

.field input[type="number"],
.field select {
  width: 100%;
  padding: 12px 14px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-family: var(--font-sans);
  background: var(--color-surface);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.field input[type="number"]:focus,
.field select:focus {
  outline: none;
  border-color: var(--color-primary-light);
  box-shadow: 0 0 0 3px rgba(74, 124, 35, 0.15);
}

.field-hint {
  display: block;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-top: 4px;
}

.checkbox-field label {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  font-weight: 500;
}

.checkbox-field input[type="checkbox"] {
  width: 20px;
  height: 20px;
  accent-color: var(--color-primary);
}

/* Results */
.calc-results {
  background: var(--color-surface-alt);
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid var(--color-border);
}

.result-visual {
  margin-bottom: 24px;
  text-align: center;
}

.post-diagram {
  max-width: 180px;
  margin: 0 auto;
}

.result-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 20px;
}

.result-card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: center;
  border: 1px solid var(--color-border);
}

.result-card.highlight {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
  grid-column: 1 / -1;
}

.result-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  opacity: 0.8;
  margin-bottom: 4px;
}

.result-card.highlight .result-label {
  color: rgba(255,255,255,0.9);
}

.result-value {
  display: block;
  font-size: 1.8rem;
  font-weight: 800;
  line-height: 1.2;
}

.result-unit {
  display: block;
  font-size: 0.85rem;
  opacity: 0.7;
}

.result-actions {
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.result-note {
  background: var(--color-surface);
  border-radius: var(--radius-sm);
  padding: 14px;
  font-size: 0.9rem;
  border-left: 4px solid var(--color-accent);
}

.result-note p {
  margin: 0;
}

/* Guide Section */
.guide-section {
  padding: 60px 0;
  background: var(--color-bg);
}

.guide-section h2 {
  font-size: 1.75rem;
  margin-bottom: 32px;
  color: var(--color-primary-dark);
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 32px;
}

.guide-card {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 24px;
  border: 1px solid var(--color-border);
}

.guide-card h3 {
  font-size: 1.1rem;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.guide-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.guide-scenario {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 28px;
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
}

.guide-scenario h3 {
  font-size: 1.1rem;
  color: var(--color-primary-dark);
  margin-bottom: 12px;
}

.guide-scenario p {
  margin-bottom: 12px;
  color: var(--color-text-muted);
}

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

/* Mistakes Section */
.mistakes-section {
  padding: 60px 0;
  background: var(--color-surface);
}

.mistakes-section h2 {
  font-size: 1.75rem;
  margin-bottom: 32px;
  color: var(--color-primary-dark);
}

.mistakes-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.mistake-card {
  background: var(--color-surface-alt);
  border-radius: var(--radius-md);
  padding: 24px;
  border: 1px solid var(--color-border);
}

.mistake-card h3 {
  font-size: 1.05rem;
  color: var(--color-error);
  margin-bottom: 10px;
}

.mistake-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

/* Reference Section */
.reference-section {
  padding: 60px 0;
  background: var(--color-bg);
}

.reference-section h2 {
  font-size: 1.75rem;
  margin-bottom: 12px;
  color: var(--color-primary-dark);
}

.reference-section > .container > p {
  color: var(--color-text-muted);
  margin-bottom: 24px;
}

.table-wrapper {
  overflow-x: auto;
  margin-bottom: 32px;
}

.ref-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.ref-table th,
.ref-table td {
  padding: 14px 18px;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.ref-table th {
  background: var(--color-primary);
  color: white;
  font-weight: 600;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.ref-table tr:last-child td {
  border-bottom: none;
}

.ref-table tr:hover td {
  background: var(--color-surface-alt);
}

.reference-notes {
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 24px;
  border: 1px solid var(--color-border);
}

.reference-notes h3 {
  font-size: 1.1rem;
  color: var(--color-primary-dark);
  margin-bottom: 14px;
}

.reference-notes ul {
  list-style: none;
  padding: 0;
}

.reference-notes li {
  padding: 8px 0;
  padding-left: 20px;
  position: relative;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.reference-notes li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--color-primary-light);
  font-weight: bold;
}

/* Assumptions Section */
.assumptions-section {
  padding: 60px 0;
  background: var(--color-surface);
}

.assumptions-section h2 {
  font-size: 1.75rem;
  margin-bottom: 20px;
  color: var(--color-primary-dark);
}

.assumptions-box {
  background: var(--color-surface-alt);
  border-radius: var(--radius-md);
  padding: 28px;
  border: 1px solid var(--color-border);
}

.assumptions-box p {
  margin-bottom: 14px;
  color: var(--color-text-muted);
}

.assumptions-box ul {
  margin-bottom: 16px;
  padding-left: 20px;
}

.assumptions-box li {
  margin-bottom: 6px;
  color: var(--color-text-muted);
}

.last-updated {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  font-style: italic;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

/* Footer */
.site-footer {
  background: var(--color-primary-dark);
  color: rgba(255,255,255,0.85);
  padding: 48px 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 32px;
}

.footer-brand .logo-text {
  color: white;
  font-size: 1.25rem;
}

.footer-brand p {
  margin-top: 10px;
  font-size: 0.9rem;
  opacity: 0.8;
}

.footer-links h4 {
  color: white;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 14px;
}

.footer-links a {
  display: block;
  color: rgba(255,255,255,0.75);
  font-size: 0.9rem;
  padding: 4px 0;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--color-accent);
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.15);
  text-align: center;
  font-size: 0.85rem;
}

.footer-bottom a {
  color: var(--color-accent);
}

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

/* Responsive */
@media (max-width: 900px) {
  .calc-layout {
    grid-template-columns: 1fr;
  }
  
  .guide-grid,
  .mistakes-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .hero-sub {
    font-size: 1.05rem;
  }
}

@media (max-width: 600px) {
  .site-header .container {
    flex-direction: column;
    height: auto;
    padding: 12px 20px;
    gap: 10px;
  }
  
  .site-nav {
    gap: 16px;
  }
  
  .hero {
    padding: 48px 0;
  }
  
  .hero h1 {
    font-size: 1.6rem;
  }
  
  .result-cards {
    grid-template-columns: 1fr;
  }
  
  .result-actions {
    flex-direction: column;
  }
  
  .btn-secondary {
    width: 100%;
    text-align: center;
  }
}

/* Print Styles */
@media print {
  .site-header,
  .site-footer,
  .result-actions,
  .hero {
    display: none;
  }
  
  .calc-results {
    border: 2px solid #333;
  }
  
  body {
    background: white;
  }
}

/* Focus Styles for Accessibility */
:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  
  html {
    scroll-behavior: auto;
  }
}


/* 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;
}