/* StainCalc — Fence & Deck Stain Coverage Planner */
:root {
  --color-bg: #FAF8F4;
  --color-surface: #FFFFFF;
  --color-surface-alt: #F3EDE0;
  --color-primary: #6B4F10;
  --color-primary-light: #8B6914;
  --color-primary-dark: #4A3508;
  --color-accent: #C4882A;
  --color-accent-light: #E8C47A;
  --color-text: #2C2418;
  --color-text-secondary: #6B5D4A;
  --color-text-muted: #9A8B76;
  --color-border: #D9CDB8;
  --color-border-light: #EDE6D8;
  --color-success: #3A7D44;
  --color-error: #B93A3A;
  --color-focus: #C4882A;
  --shadow-sm: 0 1px 3px rgba(44,36,24,0.08);
  --shadow-md: 0 4px 12px rgba(44,36,24,0.10);
  --shadow-lg: 0 8px 24px rgba(44,36,24,0.12);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', SFMono-Regular, Consolas, 'Liberation Mono', Menlo, monospace;
  --max-width: 1160px;
  --header-height: 64px;
}

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

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) + 16px); }

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--color-primary-light); text-decoration: none; }
a:hover, a:focus-visible { color: var(--color-primary-dark); text-decoration: underline; }

img, svg { display: block; max-width: 100%; }

.container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }

.skip-link {
  position: absolute; top: -100%; left: 16px; z-index: 9999;
  background: var(--color-primary); color: #fff;
  padding: 8px 16px; border-radius: var(--radius-sm);
  font-weight: 600;
}
.skip-link:focus { top: 8px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border-light);
  height: var(--header-height);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 100%;
}
.logo {
  display: flex; align-items: center; gap: 10px;
  color: var(--color-primary); font-weight: 700; font-size: 1.2rem;
}
.logo:hover, .logo:focus-visible { color: var(--color-primary-dark); text-decoration: none; }
.logo-icon { flex-shrink: 0; }

.main-nav ul { display: flex; list-style: none; gap: 4px; }
.main-nav a {
  display: block; padding: 8px 14px;
  color: var(--color-text-secondary); font-size: 0.9rem; font-weight: 500;
  border-radius: var(--radius-sm); transition: all 0.15s;
}
.main-nav a:hover, .main-nav a:focus-visible,
.main-nav a.active {
  color: var(--color-primary);
  background: var(--color-surface-alt);
  text-decoration: none;
}

/* Hero */
.hero-section {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-primary-light) 100%);
  color: #fff; padding: 64px 0 56px;
}
.hero-content { max-width: 640px; }
.hero-content h1 { font-size: 2.4rem; font-weight: 800; line-height: 1.2; margin-bottom: 16px; }
.hero-sub { font-size: 1.1rem; opacity: 0.9; margin-bottom: 32px; line-height: 1.5; }
.hero-stats { display: flex; gap: 32px; }
.stat { display: flex; flex-direction: column; }
.stat strong { font-size: 1.4rem; font-weight: 800; }
.stat span { font-size: 0.8rem; opacity: 0.8; text-transform: uppercase; letter-spacing: 0.5px; }

/* Planner */
.planner-section { padding: 48px 0 56px; }
.planner-layout {
  display: grid; grid-template-columns: 1fr 380px;
  gap: 32px; align-items: start;
}

.planner-form-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
}
.planner-form-panel h2 { font-size: 1.3rem; margin-bottom: 24px; }

fieldset { border: none; margin-bottom: 24px; }
legend { font-weight: 600; font-size: 0.95rem; margin-bottom: 10px; color: var(--color-text); }

.radio-group { display: flex; gap: 12px; }
.radio-card {
  flex: 1;
  display: flex; align-items: center; justify-content: center;
  padding: 14px; border: 2px solid var(--color-border);
  border-radius: var(--radius-md); cursor: pointer;
  transition: all 0.15s;
}
.radio-card input { position: absolute; opacity: 0; width: 0; height: 0; }
.radio-card:has(input:checked) {
  border-color: var(--color-primary-light);
  background: var(--color-surface-alt);
}
.radio-label { font-weight: 600; font-size: 0.95rem; }

.field { margin-bottom: 16px; }
.field label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 4px; color: var(--color-text-secondary); }
.field input[type="number"], .field select {
  width: 100%; padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.95rem; font-family: var(--font-sans);
  background: var(--color-bg); color: var(--color-text);
  transition: border-color 0.15s;
}
.field input:focus, .field select:focus {
  outline: none; border-color: var(--color-focus);
  box-shadow: 0 0 0 3px rgba(196,136,42,0.2);
}
.field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.field-note { font-size: 0.8rem; color: var(--color-text-muted); margin-top: 4px; }
.checkbox-field label {
  display: flex; align-items: center; gap: 8px;
  font-size: 0.9rem; font-weight: 500; cursor: pointer;
}
.checkbox-field input[type="checkbox"] {
  width: 18px; height: 18px; accent-color: var(--color-primary-light);
}

.btn-primary {
  display: block; width: 100%;
  padding: 14px; border: none; border-radius: var(--radius-md);
  background: var(--color-primary); color: #fff;
  font-size: 1rem; font-weight: 700; cursor: pointer;
  transition: background 0.15s;
}
.btn-primary:hover, .btn-primary:focus-visible { background: var(--color-primary-dark); }

/* Results panel */
.results-panel {
  position: sticky; top: calc(var(--header-height) + 24px);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
}
.results-panel h2 { font-size: 1.2rem; margin-bottom: 20px; }
.results-empty {
  text-align: center; padding: 32px 16px;
  color: var(--color-text-muted);
}
.results-empty svg { margin: 0 auto 12px; opacity: 0.5; }

.result-cards {
  display: grid; grid-template-columns: 1fr 1fr; gap: 12px;
  margin-bottom: 24px;
}
.result-card {
  background: var(--color-surface-alt);
  border-radius: var(--radius-md);
  padding: 16px; text-align: center;
}
.result-card.highlight {
  grid-column: 1 / -1;
  background: var(--color-primary);
  color: #fff;
}
.result-value { display: block; font-size: 1.8rem; font-weight: 800; line-height: 1.2; }
.result-card.highlight .result-value { font-size: 2.4rem; }
.result-label { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.5px; opacity: 0.8; }

.result-breakdown { margin-bottom: 20px; }
.result-breakdown h3 { font-size: 0.9rem; margin-bottom: 8px; color: var(--color-text-secondary); }
.breakdown-table { width: 100%; font-size: 0.85rem; }
.breakdown-table td { padding: 4px 0; border-bottom: 1px solid var(--color-border-light); }
.breakdown-table td:last-child { text-align: right; font-weight: 600; }

.result-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.btn-secondary {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 14px; border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-bg); color: var(--color-text);
  font-size: 0.82rem; font-weight: 600; cursor: pointer;
  transition: all 0.15s;
}
.btn-secondary:hover, .btn-secondary:focus-visible {
  background: var(--color-surface-alt);
  border-color: var(--color-primary-light);
}

.notice {
  margin-top: 12px; padding: 8px 12px;
  background: #E8F5E9; color: var(--color-success);
  border-radius: var(--radius-sm);
  font-size: 0.85rem; font-weight: 500;
}

/* Products section */
.products-section { padding: 48px 0; background: var(--color-surface); }
.products-section h2 { font-size: 1.5rem; margin-bottom: 8px; }
.section-intp { color: var(--color-text-secondary); margin-bottom: 24px; max-width: 600px; }

.table-wrap { overflow-x: auto; margin-bottom: 20px; }
.comparison-table {
  width: 100%; border-collapse: collapse;
  font-size: 0.9rem;
}
.comparison-table th {
  text-align: left; padding: 12px 16px;
  background: var(--color-surface-alt);
  font-weight: 700; font-size: 0.8rem;
  text-transform: uppercase; letter-spacing: 0.5px;
  color: var(--color-text-secondary);
  border-bottom: 2px solid var(--color-border);
}
.comparison-table td {
  padding: 12px 16px; border-bottom: 1px solid var(--color-border-light);
}
.comparison-table tr:hover td { background: var(--color-surface-alt); }

.product-tip {
  background: #FFF8E7; border-left: 4px solid var(--color-accent);
  padding: 14px 18px; border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.9rem;
}

/* Guide section */
.guide-section { padding: 48px 0 56px; }
.guide-section h2 { font-size: 1.5rem; margin-bottom: 24px; }
.guide-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 20px; margin-bottom: 40px;
}
.guide-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 22px;
}
.guide-card h3 { font-size: 1rem; margin-bottom: 8px; color: var(--color-primary); }
.guide-card p, .guide-card li { font-size: 0.9rem; color: var(--color-text-secondary); }
.guide-card ul { padding-left: 18px; }
.guide-card li { margin-bottom: 4px; }

.scenario-walkthrough {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
}
.scenario-walkthrough h3 { font-size: 1.1rem; margin-bottom: 12px; }
.scenario-walkthrough p { color: var(--color-text-secondary); margin-bottom: 12px; font-size: 0.92rem; }
.scenario-walkthrough ol { padding-left: 20px; margin-bottom: 12px; }
.scenario-walkthrough li { font-size: 0.9rem; color: var(--color-text-secondary); margin-bottom: 4px; font-family: var(--font-mono); }

/* FAQ */
.faq-section { padding: 48px 0; background: var(--color-surface); }
.faq-section h2 { font-size: 1.5rem; margin-bottom: 24px; }
.faq-list { display: flex; flex-direction: column; gap: 0; }
.faq-item {
  border-bottom: 1px solid var(--color-border-light);
  padding: 18px 0;
}
.faq-item dt { font-weight: 700; font-size: 0.95rem; margin-bottom: 6px; }
.faq-item dd { font-size: 0.9rem; color: var(--color-text-secondary); }

/* Footer */
.site-footer {
  background: var(--color-primary-dark); color: rgba(255,255,255,0.8);
  padding: 40px 0 32px; font-size: 0.85rem;
}
.footer-inner { display: flex; flex-direction: column; gap: 20px; }
.footer-brand .logo-text { color: #fff; font-weight: 700; font-size: 1.1rem; }
.footer-brand p { margin-top: 8px; max-width: 360px; }
.footer-brand a { color: var(--color-accent-light); }
.footer-nav { display: flex; flex-wrap: wrap; gap: 16px; }
.footer-nav a { color: rgba(255,255,255,0.7); }
.footer-nav a:hover { color: #fff; }
.footer-meta { color: rgba(255,255,255,0.5); font-size: 0.8rem; }

/* Responsive */
@media (max-width: 900px) {
  .planner-layout { grid-template-columns: 1fr; }
  .results-panel { position: static; }
  .guide-grid { grid-template-columns: repeat(2, 1fr); }
  .hero-content h1 { font-size: 1.8rem; }
  .hero-stats { gap: 20px; }
}

@media (max-width: 600px) {
  .container { padding: 0 16px; }
  .hero-section { padding: 40px 0 36px; }
  .hero-content h1 { font-size: 1.5rem; }
  .hero-stats { flex-direction: column; gap: 8px; }
  .planner-form-panel { padding: 20px; }
  .field-row { grid-template-columns: 1fr; }
  .radio-group { flex-direction: column; }
  .guide-grid { grid-template-columns: 1fr; }
  .result-cards { grid-template-columns: 1fr 1fr; }
  .result-card.highlight { grid-column: 1 / -1; }
  .main-nav ul { gap: 0; }
  .main-nav a { padding: 6px 10px; font-size: 0.82rem; }
}

@media print {
  .site-header, .site-footer, .hero-section, .products-section, .guide-section, .faq-section, .result-actions { display: none; }
  .planner-section { padding: 0; }
  .planner-layout { display: block; }
  .results-panel { border: none; padding: 0; }
  body { background: #fff; color: #000; }
}

/* Focus visible */
:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

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



/* 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;
}