/**
 * RoofPitchCalculator.co.uk — Master Theme CSS
 * Version: 5.0.0 Pro Suite (Mobile-Hardened & All-Device Optimized)
 */

:root {
  --color-slate-900: #0f172a;
  --color-slate-800: #1e293b;
  --color-slate-700: #334155;
  --color-slate-600: #475569;
  --color-slate-500: #64748b;
  --color-slate-400: #94a3b8;
  --color-slate-300: #cbd5e1;
  --color-slate-200: #e2e8f0;
  --color-slate-100: #f1f5f9;
  --color-slate-50: #f8fafc;
  --color-brand-primary: #2563eb;
  --color-brand-hover: #1d4ed8;
  --color-brand-light: #eff6ff;
  --color-emerald-600: #059669;
  --color-emerald-50: #ecfdf5;
  --color-amber-600: #d97706;
  --color-amber-50: #fffbeb;
  --color-red-600: #dc2626;
  --color-red-50: #fef2f2;
  --font-family-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-family-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

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

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

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-family-sans);
  color: var(--color-slate-800);
  background-color: #f8fafc;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Containers */
.site-container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

@media (max-width: 640px) {
  .site-container {
    padding: 0 1rem;
  }
}

/* Header & Nav */
.site-header {
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-slate-200);
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.site-header-container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0.75rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

@media (max-width: 640px) {
  .site-header-container {
    padding: 0.65rem 1rem;
  }
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--color-slate-900);
  transition: opacity 0.15s ease;
}

.site-brand:hover {
  opacity: 0.9;
}

.site-logo-img {
  height: 44px;
  width: auto;
  display: block;
}

.footer-logo-img {
  height: 42px;
  width: auto;
  display: block;
}

@media (max-width: 480px) {
  .site-logo-img {
    height: 38px;
  }
  .footer-logo-img {
    height: 36px;
  }
}

.brand-icon {
  color: var(--color-brand-primary);
  flex-shrink: 0;
}

.brand-name {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--color-slate-900);
}

.brand-suffix {
  color: var(--color-brand-primary);
}

.primary-nav {
  display: flex;
  align-items: center;
}

.nav-menu-list {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 0.5rem;
}

.nav-menu-list a {
  display: inline-block;
  padding: 0.55rem 0.9rem;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--color-slate-700);
  text-decoration: none;
  border-radius: 6px;
  transition: all 0.15s ease;
  min-height: 40px;
}

.nav-menu-list a:hover {
  color: var(--color-brand-primary);
  background-color: var(--color-slate-100);
}

.mobile-menu-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--color-slate-800);
  cursor: pointer;
  padding: 0.5rem;
  min-width: 44px;
  min-height: 44px;
  touch-action: manipulation;
}

@media (max-width: 860px) {
  .mobile-menu-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }
  .primary-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #ffffff;
    border-bottom: 1px solid var(--color-slate-200);
    padding: 1rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  }
  .primary-nav.is-open {
    display: block;
  }
  .nav-menu-list {
    flex-direction: column;
    gap: 0.35rem;
  }
  .nav-menu-list a {
    width: 100%;
    padding: 0.75rem 1rem;
  }
}

/* Breadcrumbs */
.breadcrumbs-wrapper {
  background: #ffffff;
  border-bottom: 1px solid var(--color-slate-200);
  padding: 0.6rem 0;
}

.site-breadcrumbs ol {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--color-slate-500);
  align-items: center;
  flex-wrap: wrap;
}

.site-breadcrumbs a {
  color: var(--color-slate-600);
  text-decoration: none;
  font-weight: 600;
}

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

.site-breadcrumbs .separator {
  color: var(--color-slate-400);
}

/* Main Content */
.site-main {
  padding: 2rem 0 4rem 0;
}

@media (max-width: 640px) {
  .site-main {
    padding: 1.25rem 0 3rem 0;
  }
}

.entry-header {
  margin-bottom: 1.75rem;
}

.entry-title {
  font-size: clamp(1.75rem, 4vw, 2.35rem);
  font-weight: 900;
  color: var(--color-slate-900);
  letter-spacing: -0.03em;
  margin: 0 0 0.75rem 0;
  line-height: 1.2;
}

.hero-feature-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.feature-pill {
  display: inline-flex;
  align-items: center;
  background: #ffffff;
  border: 1px solid var(--color-slate-300);
  border-radius: 9999px;
  padding: 0.3rem 0.85rem;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-slate-700);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.entry-content {
  color: var(--color-slate-700);
  font-size: 1rem;
  line-height: 1.7;
}

.entry-content h2 {
  font-size: clamp(1.3rem, 3vw, 1.6rem);
  font-weight: 800;
  color: var(--color-slate-900);
  margin: 2.5rem 0 1rem 0;
  letter-spacing: -0.02em;
}

.entry-content h3 {
  font-size: clamp(1.1rem, 2.5vw, 1.25rem);
  font-weight: 700;
  color: var(--color-slate-800);
  margin: 1.75rem 0 0.75rem 0;
}

.entry-content p {
  margin: 0 0 1.25rem 0;
}

.entry-content ul, .entry-content ol {
  margin: 0 0 1.5rem 0;
  padding-left: 1.5rem;
}

.entry-content li {
  margin-bottom: 0.5rem;
}

/* Callout Box */
.direct-answer-box {
  background: #ffffff;
  border-left: 4px solid var(--color-brand-primary);
  border-radius: 0 10px 10px 0;
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0 2rem 0;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
  font-size: 1rem;
  line-height: 1.65;
}

.direct-answer-box p {
  margin: 0;
}

/* Formula Card */
.formula-card {
  background: #ffffff;
  border: 1px solid var(--color-slate-200);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  margin: 1.25rem 0;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
}

.formula-card-title {
  font-size: 0.8125rem;
  font-weight: 800;
  text-transform: uppercase;
  color: var(--color-slate-500);
  letter-spacing: 0.05em;
  margin-bottom: 0.4rem;
}

.formula-card-code {
  font-family: var(--font-family-mono);
  font-size: clamp(0.95rem, 2.5vw, 1.15rem);
  font-weight: 800;
  color: var(--color-brand-primary);
  background: var(--color-slate-50);
  padding: 0.6rem 0.85rem;
  border-radius: 6px;
  display: inline-block;
  margin: 0.25rem 0 0.5rem 0;
  word-break: break-word;
}

.formula-card-desc {
  font-size: 0.875rem;
  color: var(--color-slate-600);
  margin: 0.25rem 0 0 0;
}

/* Worked Example Card */
.worked-example-card {
  background: #ffffff;
  border: 1.5px solid var(--color-slate-200);
  border-radius: 14px;
  padding: 1.5rem;
  margin: 1.5rem 0;
  box-shadow: 0 4px 8px -2px rgba(0, 0, 0, 0.05);
}

.worked-example-card h4 {
  margin: 0 0 0.75rem 0;
  font-size: 1.1rem;
  color: var(--color-slate-900);
}

.worked-example-card ul {
  margin-bottom: 0;
}

/* Content Tables */
.content-table-wrapper {
  overflow-x: auto;
  margin: 1.75rem 0;
  background: #ffffff;
  border: 1px solid var(--color-slate-200);
  border-radius: 12px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
  -webkit-overflow-scrolling: touch;
}

.content-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.875rem;
  min-width: 540px;
}

.content-table th {
  background: var(--color-slate-100);
  color: var(--color-slate-800);
  font-weight: 800;
  padding: 0.85rem 1.1rem;
  border-bottom: 1px solid var(--color-slate-200);
}

.content-table td {
  padding: 0.85rem 1.1rem;
  border-bottom: 1px solid var(--color-slate-100);
  color: var(--color-slate-700);
}

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

.content-table tr:hover td {
  background: var(--color-slate-50);
}

/* Quick Link Card */
.quick-link-card {
  display: block;
  background: #ffffff;
  border: 1.5px solid var(--color-slate-200);
  border-radius: 12px;
  padding: 1.25rem;
  text-decoration: none;
  transition: all 0.15s ease;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.quick-link-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-brand-primary);
  box-shadow: 0 8px 16px -2px rgba(37, 99, 235, 0.15);
}

/* FAQ Accordion */
.faq-accordion-group {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin: 1.5rem 0;
}

.faq-item {
  background: #ffffff;
  border: 1px solid var(--color-slate-200);
  border-radius: 10px;
  overflow: hidden;
}

.faq-question {
  padding: 1.1rem 1.25rem;
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--color-slate-900);
  cursor: pointer;
  user-select: none;
  background: #ffffff;
  transition: background 0.12s ease;
  touch-action: manipulation;
}

.faq-question:hover {
  background: var(--color-slate-50);
}

.faq-answer {
  padding: 0 1.25rem 1.25rem 1.25rem;
  font-size: 0.875rem;
  color: var(--color-slate-700);
  line-height: 1.65;
}

.faq-answer p:last-child {
  margin-bottom: 0;
}

/* Audit Tag */
.meta-audit-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-slate-500);
  background: var(--color-slate-100);
  padding: 0.45rem 0.85rem;
  border-radius: 8px;
  margin-top: 2rem;
}

/* Footer */
.site-footer {
  background: var(--color-slate-900);
  color: var(--color-slate-300);
  padding: 3.5rem 0 2rem 0;
  font-size: 0.875rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 3rem;
}

@media (max-width: 900px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

@media (max-width: 540px) {
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.75rem;
  }
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.2rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 0.75rem;
}

.footer-desc {
  color: var(--color-slate-400);
  font-size: 0.8125rem;
  line-height: 1.5;
  margin: 0 0 1rem 0;
}

.footer-audit-note {
  font-size: 0.75rem;
  color: var(--color-slate-400);
}

.footer-heading {
  font-size: 0.875rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #ffffff;
  margin: 0 0 1rem 0;
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-links a {
  color: var(--color-slate-400);
  text-decoration: none;
  transition: color 0.12s ease;
  display: inline-block;
  padding: 0.15rem 0;
}

.footer-links a:hover {
  color: #ffffff;
}

.footer-bottom {
  border-top: 1px solid var(--color-slate-800);
  padding-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  font-size: 0.75rem;
  color: var(--color-slate-400);
}