:root {
  --bg: #f6f4ef;
  --surface: #ffffff;
  --surface-alt: #ece8df;
  --text: #1f231a;
  --text-muted: #5a6050;
  --accent: #2f6b3a;
  --accent-dark: #1e4a26;
  --accent-light: #e4efe6;
  --border: #d6d2c4;
  --radius: 10px;
  --shadow: 0 2px 8px rgba(31,35,26,0.06);
  --max-width: 1100px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
}

a { color: var(--accent); }
a:hover { color: var(--accent-dark); }

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

/* Header */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.1rem;
}
.brand svg { color: var(--accent); }
.site-nav {
  display: flex;
  gap: 20px;
}
.site-nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
}
.site-nav a:hover { color: var(--accent); }

/* Intro */
.intro {
  padding: 48px 0 24px;
  max-width: 720px;
}
.eyebrow {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  font-weight: 700;
  margin: 0 0 8px;
}
.intro h1 {
  font-size: 2.2rem;
  line-height: 1.2;
  margin: 0 0 16px;
}
.lead {
  font-size: 1.1rem;
  color: var(--text-muted);
  margin: 0 0 12px;
}
.meta-note {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: italic;
}

/* Worksheet */
.worksheet {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin: 32px 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
}
.worksheet-left h2,
.worksheet-right h2 {
  font-size: 1.3rem;
  margin: 0 0 12px;
}

.measure-steps {
  padding-left: 20px;
  margin: 16px 0;
}
.measure-steps li {
  margin-bottom: 14px;
  padding-left: 4px;
}

.diagram {
  margin: 24px 0;
  padding: 16px;
  background: var(--surface-alt);
  border-radius: var(--radius);
  text-align: center;
}
.diagram svg {
  max-width: 200px;
  height: auto;
  color: var(--accent);
}
.diagram figcaption {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 8px;
}

.common-mistakes {
  background: #fdf6e3;
  border-left: 4px solid #d4a017;
  padding: 16px 20px;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin-top: 24px;
}
.common-mistakes h3 {
  margin: 0 0 8px;
  font-size: 1rem;
}
.common-mistakes ul {
  margin: 0;
  padding-left: 18px;
}
.common-mistakes li { margin-bottom: 6px; }

/* Form */
.fit-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.field { display: flex; flex-direction: column; gap: 4px; }
.field label {
  font-weight: 600;
  font-size: 0.9rem;
}
.input-group {
  display: flex;
  gap: 8px;
}
.input-group input,
.input-group select,
.field select {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 1rem;
  background: var(--surface);
  color: var(--text);
  font-family: var(--font);
}
.input-group input { flex: 1; }
.input-group select { width: 90px; }
.field select { width: 100%; }
.help {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: 0;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 12px 20px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 6px;
  cursor: pointer;
  font-family: var(--font);
  margin-top: 8px;
}
.btn-primary:hover { background: var(--accent-dark); }
.btn-secondary {
  background: var(--surface-alt);
  color: var(--text);
  border: 1px solid var(--border);
  padding: 10px 16px;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 6px;
  cursor: pointer;
  font-family: var(--font);
}
.btn-secondary:hover { background: var(--border); }

/* Results */
.results {
  margin-top: 24px;
  padding: 20px;
  background: var(--accent-light);
  border-radius: var(--radius);
  border: 1px solid var(--accent);
}
.results-empty {
  color: var(--text-muted);
  font-size: 0.95rem;
}
.results-empty p { margin: 0; }
.result-row {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}
.result-row:last-child { border-bottom: none; }
.result-label { font-weight: 600; }
.result-value { color: var(--accent-dark); font-weight: 600; }
.result-note {
  margin-top: 12px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Brand table */
.brand-section { margin: 48px 0; }
.brand-section h2 { font-size: 1.5rem; margin-bottom: 8px; }
.brand-section p { color: var(--text-muted); }
.table-wrap {
  overflow-x: auto;
  margin-top: 20px;
}
.brand-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.brand-table th,
.brand-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border);
}
.brand-table th {
  background: var(--accent);
  color: #fff;
  font-weight: 600;
}
.brand-table tr:nth-child(even) { background: var(--surface-alt); }
.brand-table tr:hover { background: var(--accent-light); }
.table-note {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 12px;
  font-style: italic;
}

/* Load section */
.load-section { margin: 48px 0; }
.load-section h2 { font-size: 1.5rem; margin-bottom: 8px; }
.load-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-top: 20px;
}
.load-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
}
.load-card h3 {
  margin: 0 0 4px;
  font-size: 1.1rem;
  color: var(--accent);
}
.load-vol {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin: 0 0 8px;
  font-weight: 600;
}
.load-card p { margin: 4px 0; font-size: 0.9rem; }
.load-tip {
  margin-top: 24px;
  background: var(--surface-alt);
  padding: 20px;
  border-radius: var(--radius);
  border-left: 4px solid var(--accent);
}
.load-tip h3 { margin: 0 0 8px; font-size: 1rem; }
.load-tip p { margin: 0; color: var(--text-muted); }

/* Record card */
.record-section { margin: 48px 0; }
.record-section h2 { font-size: 1.5rem; margin-bottom: 8px; }
.record-card {
  background: var(--surface);
  border: 2px solid var(--accent);
  border-radius: var(--radius);
  padding: 24px;
  margin-top: 20px;
  box-shadow: var(--shadow);
}
.record-header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 12px;
  margin-bottom: 16px;
}
.record-header h3 {
  margin: 0 0 4px;
  color: var(--accent);
}
.record-header p {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.record-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}
.record-item {
  display: flex;
  flex-direction: column;
  padding: 8px 0;
}
.record-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}
.record-value {
  font-weight: 600;
  font-size: 1.05rem;
}
.record-brands {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  font-size: 0.95rem;
}
.record-brands p { margin: 4px 0; }
.record-actions {
  display: flex;
  gap: 12px;
  margin-top: 16px;
  flex-wrap: wrap;
}
.copy-confirm {
  font-size: 0.85rem;
  color: var(--accent);
  margin-top: 8px;
  min-height: 1.2em;
}

/* Troubleshoot */
.troubleshoot {
  margin: 48px 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}
.troubleshoot h2 { font-size: 1.3rem; margin: 0 0 8px; }
.troubleshoot ul {
  padding-left: 20px;
  margin: 12px 0 0;
}
.troubleshoot li { margin-bottom: 8px; }

/* Footer */
.site-footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  margin-top: 48px;
  padding: 24px 0;
}
.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.footer-inner p { margin: 0; }
.footer-nav {
  display: flex;
  gap: 16px;
  margin-top: 8px;
}
.footer-nav a { color: var(--text-muted); }
.footer-nav a:hover { color: var(--accent); }

/* Responsive */
@media (max-width: 768px) {
  .worksheet {
    grid-template-columns: 1fr;
    padding: 20px;
  }
  .intro h1 { font-size: 1.7rem; }
  .site-nav { gap: 12px; }
  .site-nav a { font-size: 0.85rem; }
  .brand span { font-size: 1rem; }
  .record-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .header-inner { flex-direction: column; gap: 10px; }
  .record-grid { grid-template-columns: 1fr; }
  .record-actions { flex-direction: column; }
  .record-actions button { width: 100%; }
}

@media print {
  .site-header, .site-footer, .record-actions, .worksheet-right form, .btn-primary, .btn-secondary { display: none; }
  .record-card { border: 2px solid #000; box-shadow: none; }
  body { background: #fff; }
}



/* 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;
}