/* blog.css — feuille unique partagée par les 10 articles et la page index
   Charte cohérente avec le site GS Travaux Rénovation :
   - palette amber/gray (Tailwind amber-700 = #B45309, gray-900 = #111827)
   - polices system, espacements 8px, titres gras, boutons arrondis
*/

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

:root {
  --amber-50: #fffbeb;
  --amber-100: #fef3c7;
  --amber-500: #f59e0b;
  --amber-600: #d97706;
  --amber-700: #b45309;
  --amber-800: #92400e;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --white: #ffffff;
  --max-width: 800px;
  --max-width-narrow: 720px;
}

html { scroll-behavior: smooth; }

body {
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--gray-50);
  color: var(--gray-700);
  line-height: 1.6;
  font-size: 1rem;
  -webkit-font-smoothing: antialiased;
}

/* ── Header ────────────────────────────────────── */
.blog-header {
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  padding: 1rem 1.5rem;
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}
.blog-header a {
  color: var(--amber-700);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.25rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.blog-header a:hover { color: var(--amber-800); }

/* ── Breadcrumb ────────────────────────────────── */
.breadcrumb {
  max-width: var(--max-width);
  margin: 1.5rem auto 0;
  padding: 0 1.5rem;
  font-size: 0.875rem;
  color: var(--gray-500);
}
.breadcrumb a {
  color: var(--gray-500);
  text-decoration: none;
}
.breadcrumb a:hover { color: var(--amber-700); }
.breadcrumb span { margin: 0 0.5rem; color: var(--gray-300); }

/* ── Article layout ────────────────────────────── */
article {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

h1 {
  font-size: 2.25rem;
  font-weight: 800;
  color: var(--gray-900);
  line-height: 1.2;
  margin-bottom: 1.5rem;
}

h2 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--gray-900);
  line-height: 1.3;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
}

h3 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--gray-800);
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

p {
  margin-bottom: 1.25rem;
  color: var(--gray-600);
  line-height: 1.7;
}

ul, ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
  color: var(--gray-600);
}
li { margin-bottom: 0.5rem; line-height: 1.7; }

a {
  color: var(--amber-700);
  text-decoration: underline;
  text-underline-offset: 2px;
}
a:hover { color: var(--amber-800); }

strong { font-weight: 600; color: var(--gray-900); }

/* ── Hero image ────────────────────────────────── */
.hero-img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 0.75rem;
  box-shadow: 0 10px 25px rgba(0,0,0,0.12);
  margin-bottom: 2rem;
  display: block;
}

/* ── Interior figure ───────────────────────────── */
figure {
  margin: 2rem 0;
}
figure img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 0.5rem;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
  display: block;
}
figcaption {
  text-align: center;
  font-size: 0.875rem;
  color: var(--gray-500);
  margin-top: 0.5rem;
  font-style: italic;
}

/* ── Conclusion ────────────────────────────────── */
.conclusion {
  background: var(--amber-50);
  border-left: 4px solid var(--amber-600);
  padding: 1.5rem 2rem;
  border-radius: 0 0.5rem 0.5rem 0;
  margin-top: 2.5rem;
}
.conclusion p { color: var(--gray-700); margin-bottom: 0; }

/* ── Articles similaires ───────────────────────── */
.similar {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
}
.similar h2 {
  font-size: 1.5rem;
  border-bottom: 2px solid var(--gray-200);
  padding-bottom: 0.75rem;
  margin-bottom: 1.5rem;
}
.similar ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
}
.similar li a {
  display: block;
  padding: 0.75rem 1rem;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 0.5rem;
  text-decoration: none;
  color: var(--gray-700);
  font-weight: 500;
  transition: all 0.2s ease;
}
.similar li a:hover {
  border-color: var(--amber-500);
  background: var(--amber-50);
  color: var(--amber-800);
}

/* ── Footer ────────────────────────────────────── */
.blog-footer {
  background: var(--gray-900);
  color: var(--gray-300);
  text-align: center;
  padding: 2rem 1.5rem;
  margin-top: auto;
}
.blog-footer a {
  color: var(--amber-500);
  text-decoration: none;
}
.blog-footer a:hover { color: var(--amber-400); }
.blog-footer p { color: var(--gray-400); font-size: 0.875rem; margin-top: 0.5rem; }

/* ── Blog index page ───────────────────────────── */
.blog-index {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.5rem 4rem;
}
.blog-index h1 {
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: 3rem;
}
.cluster-group {
  margin-bottom: 3rem;
}
.cluster-group h2 {
  font-size: 1.5rem;
  color: var(--amber-700);
  border-bottom: 2px solid var(--amber-100);
  padding-bottom: 0.75rem;
  margin-bottom: 1.5rem;
}
.cluster-group ul {
  list-style: none;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}
.cluster-group li a {
  display: block;
  padding: 0.875rem 1.25rem;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: 0.5rem;
  text-decoration: none;
  color: var(--gray-700);
  font-weight: 500;
  transition: all 0.2s ease;
}
.cluster-group li a:hover {
  border-color: var(--amber-500);
  background: var(--amber-50);
  color: var(--amber-800);
  transform: translateX(4px);
}

/* ── Responsive ────────────────────────────────── */
@media (max-width: 640px) {
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.4rem; }
  article { padding: 1.5rem 1rem 3rem; }
  .hero-img { aspect-ratio: 4 / 3; }
}