:root {
  --ink: #1a1a2e;
  --ink-light: #4a4a5a;
  --bg: #f8f7f4;
  --bg-card: #ffffff;
  --accent: #c0392b;
  --accent-dark: #962d23;
  --accent-light: #f9e5e3;
  --border: #e0ddd8;
  --success: #27ae60;
  --warning: #e67e22;
  --info: #2980b9;
  --radius: 8px;
  --shadow: 0 2px 8px rgba(0,0,0,0.06);
  --shadow-lg: 0 4px 20px rgba(0,0,0,0.1);
  --max-w: 820px;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", "Fira Code", "Consolas", monospace;
}

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

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; transition: color .15s; }
a:hover { color: var(--accent-dark); text-decoration: underline; }

/* NAV */
.site-nav {
  background: var(--ink);
  color: #fff;
  padding: 0.8rem 1.5rem;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 12px rgba(0,0,0,0.15);
}
.site-nav .nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.site-nav .logo {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
  color: #fff;
  white-space: nowrap;
}
.site-nav .logo:hover { text-decoration: none; color: #ddd; }
.site-nav .nav-links { display: flex; gap: 1.2rem; flex-wrap: wrap; }
.site-nav .nav-links a { color: #ccc; font-size: 0.85rem; }
.site-nav .nav-links a:hover { color: #fff; text-decoration: none; }

/* HERO */
.hero {
  background: linear-gradient(135deg, var(--ink) 0%, #2d2d44 100%);
  color: #fff;
  padding: 3.5rem 1.5rem 3rem;
  text-align: center;
}
.hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 0.6rem;
  line-height: 1.2;
}
.hero p {
  font-size: 1.05rem;
  color: #b0b0c0;
  max-width: 540px;
  margin: 0 auto;
}

/* CONTAINER */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* BREADCRUMB */
.breadcrumb {
  font-size: 0.82rem;
  color: var(--ink-light);
  margin-bottom: 1.5rem;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--border);
}
.breadcrumb a { color: var(--ink-light); }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb span { margin: 0 0.4rem; opacity: 0.5; }

/* CARDS */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow);
  transition: box-shadow .2s, transform .2s;
}
.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-1px);
}
.card h3 { margin-bottom: 0.4rem; font-size: 1.1rem; }
.card h3 a { color: var(--ink); }
.card h3 a:hover { color: var(--accent); }
.card p { color: var(--ink-light); font-size: 0.92rem; }

/* APPLIANCE GRID */
.appliance-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.2rem;
  margin: 2rem 0;
}
.appliance-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.8rem;
  text-align: center;
  box-shadow: var(--shadow);
  transition: box-shadow .2s, transform .2s;
}
.appliance-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}
.appliance-card .appliance-icon {
  font-size: 2.5rem;
  margin-bottom: 0.8rem;
  display: block;
}
.appliance-card h2 {
  font-size: 1.15rem;
  margin-bottom: 0.3rem;
}
.appliance-card h2 a { color: var(--ink); }
.appliance-card h2 a:hover { color: var(--accent); text-decoration: none; }
.appliance-card .model { color: var(--ink-light); font-size: 0.85rem; margin-bottom: 0.8rem; }
.appliance-card .count {
  display: inline-block;
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 600;
  font-size: 0.8rem;
  padding: 0.25rem 0.7rem;
  border-radius: 20px;
}

/* ERROR PAGE */
.error-header {
  margin-bottom: 2rem;
}
.error-header h1 {
  font-size: clamp(1.4rem, 3.5vw, 1.9rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.25;
  margin-bottom: 0.5rem;
}
.error-code-badge {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 1.1rem;
  padding: 0.35rem 1rem;
  border-radius: 6px;
  margin-bottom: 1rem;
}
.error-code-badge.symptom {
  background: var(--warning);
}
.error-meta {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--ink-light);
  margin-top: 0.5rem;
}
.error-meta strong { color: var(--ink); }

/* SECTIONS */
.section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-bottom: 1.2rem;
  box-shadow: var(--shadow);
}
.section h2 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.8rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--accent-light);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.section h2 .icon { font-size: 1.2rem; }
.section p { margin-bottom: 0.6rem; }

/* STEPS */
.steps { counter-reset: step; list-style: none; padding: 0; }
.steps li {
  counter-increment: step;
  padding: 0.7rem 0 0.7rem 3rem;
  position: relative;
  border-bottom: 1px solid #f0eeea;
}
.steps li:last-child { border-bottom: none; }
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0.7rem;
  width: 2rem;
  height: 2rem;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
}

/* CAUSES TABLE */
.causes-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}
.causes-table th {
  text-align: left;
  background: var(--bg);
  padding: 0.6rem 0.8rem;
  font-weight: 600;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink-light);
  border-bottom: 2px solid var(--border);
}
.causes-table td {
  padding: 0.7rem 0.8rem;
  border-bottom: 1px solid #f0eeea;
  vertical-align: top;
}
.causes-table tr:last-child td { border-bottom: none; }

/* SPECS BOX */
.specs-box {
  background: #f0f7ff;
  border: 1px solid #c8ddf0;
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  margin: 0.8rem 0;
  font-size: 0.9rem;
}
.specs-box strong { color: var(--info); }
.specs-box code {
  font-family: var(--mono);
  background: #fff;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.85rem;
}

/* WARNING BOX */
.warning-box {
  background: #fdf3ec;
  border-left: 4px solid var(--warning);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 1rem 1.2rem;
  margin: 0.8rem 0;
  font-size: 0.9rem;
}

/* RELATED */
.related-errors {
  margin-top: 2rem;
}
.related-errors h2 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
}
.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 0.8rem;
}
.related-grid .card { margin-bottom: 0; }

/* ERROR LIST */
.error-list { list-style: none; padding: 0; }
.error-list li {
  border-bottom: 1px solid #f0eeea;
}
.error-list li:last-child { border-bottom: none; }
.error-list a {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  padding: 0.9rem 0.4rem;
  color: var(--ink);
  transition: background .15s;
  border-radius: 4px;
}
.error-list a:hover {
  background: var(--accent-light);
  text-decoration: none;
}
.error-list .code {
  font-family: var(--mono);
  background: var(--ink);
  color: #fff;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 600;
  min-width: 60px;
  text-align: center;
  flex-shrink: 0;
}
.error-list .code.symptom {
  background: var(--warning);
}
.error-list .desc { font-size: 0.92rem; }

/* CATEGORY */
.category-header {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-light);
  font-weight: 700;
  margin: 1.5rem 0 0.5rem;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid var(--border);
}
.category-header:first-child { margin-top: 0; }

/* FOOTER */
.site-footer {
  background: var(--ink);
  color: #888;
  padding: 2rem 1.5rem;
  text-align: center;
  font-size: 0.82rem;
}
.site-footer a { color: #aaa; }
.site-footer a:hover { color: #fff; }

/* FAQ SCHEMA SECTION */
.faq-item { margin-bottom: 1rem; }
.faq-item h3 {
  font-size: 0.98rem;
  font-weight: 600;
  margin-bottom: 0.3rem;
  color: var(--ink);
}
.faq-item p { font-size: 0.9rem; color: var(--ink-light); }

/* PARTS CTA */
.parts-cta {
  background: linear-gradient(135deg, #f0faf4 0%, #e8f5ee 100%);
  border: 1px solid #b8dfc8;
  border-radius: var(--radius);
  padding: 1.5rem;
  margin: 1.5rem 0;
}
.parts-cta h2 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.8rem;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.parts-cta .part-links {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.parts-cta .part-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  background: #fff;
  border: 1px solid #d4eadc;
  border-radius: 6px;
  padding: 0.7rem 1rem;
  flex-wrap: wrap;
}
.parts-cta .part-name {
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--ink);
  flex: 1;
  min-width: 150px;
}
.parts-cta .part-spec {
  font-size: 0.8rem;
  color: var(--ink-light);
  font-family: var(--mono);
}
.parts-cta .part-buttons {
  display: flex;
  gap: 0.5rem;
  flex-shrink: 0;
}
.parts-cta .btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.9rem;
  border-radius: 5px;
  font-size: 0.8rem;
  font-weight: 600;
  text-decoration: none;
  transition: background .15s, transform .1s;
  white-space: nowrap;
}
.parts-cta .btn:hover {
  transform: translateY(-1px);
  text-decoration: none;
}
.parts-cta .btn-rc {
  background: #1a7f37;
  color: #fff;
}
.parts-cta .btn-rc:hover { background: #15692d; color: #fff; }
.parts-cta .btn-az {
  background: #ff9900;
  color: #111;
}
.parts-cta .btn-az:hover { background: #e68a00; color: #111; }
.parts-cta .disclosure {
  font-size: 0.72rem;
  color: var(--ink-light);
  margin-top: 0.8rem;
  font-style: italic;
}

/* LEAD GEN CTA */
.leadgen-cta {
  background: linear-gradient(135deg, #1a1a2e 0%, #2d2d44 100%);
  border-radius: var(--radius);
  padding: 1.8rem;
  margin: 1.5rem 0;
  text-align: center;
  color: #fff;
}
.leadgen-cta h2 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  color: #fff;
}
.leadgen-cta p {
  color: #b0b0c0;
  font-size: 0.9rem;
  margin-bottom: 1.2rem;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}
.leadgen-cta .cta-buttons {
  display: flex;
  justify-content: center;
  gap: 0.8rem;
  flex-wrap: wrap;
}
.leadgen-cta .btn-lead {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.65rem 1.4rem;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  transition: background .15s, transform .1s;
}
.leadgen-cta .btn-lead:hover {
  transform: translateY(-1px);
  text-decoration: none;
}
.leadgen-cta .btn-thumbtack {
  background: #009fd9;
  color: #fff;
}
.leadgen-cta .btn-thumbtack:hover { background: #0089bc; color: #fff; }
.leadgen-cta .btn-angi {
  background: #ff6153;
  color: #fff;
}
.leadgen-cta .btn-angi:hover { background: #e5524a; color: #fff; }
.leadgen-cta .lead-disclosure {
  font-size: 0.7rem;
  color: #777;
  margin-top: 1rem;
  font-style: italic;
}

/* RESPONSIVE */
@media (max-width: 640px) {
  .container { padding: 1.2rem 1rem 3rem; }
  .hero { padding: 2.5rem 1rem 2rem; }
  .section { padding: 1.2rem; }
  .error-meta { flex-direction: column; gap: 0.3rem; }
  .site-nav .nav-links { display: none; }
  .causes-table { font-size: 0.82rem; }
  .causes-table th, .causes-table td { padding: 0.5rem; }
}