/* ============================================
   Plus de Trafic — Theme CSS
   Clean tech editorial — blog d'expertise SEO
   ============================================ */

/* --- Variables --- */
:root {
  --color-accent: #2563eb;
  --color-accent-hover: #1d4ed8;
  --color-bg: #ffffff;
  --color-bg-alt: #f8fafc;
  --color-bg-card: #f8fafc;
  --color-text: #1e293b;
  --color-text-light: #64748b;
  --color-border: #e2e8f0;
  --color-footer-bg: #1e293b;
  --color-footer-text: #94a3b8;
  --font-heading: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --container: 1100px;
  --container-narrow: 720px;
  --radius: 6px;
  --gap: 24px;
}

/* --- Dark mode --- */
.dark {
  --color-bg: #0f172a;
  --color-bg-alt: #1e293b;
  --color-bg-card: #1e293b;
  --color-text: #e2e8f0;
  --color-text-light: #94a3b8;
  --color-border: #334155;
  --color-footer-bg: #020617;
  --color-footer-text: #64748b;
  --color-accent: #3b82f6;
  --color-accent-hover: #60a5fa;
}

.dark .site-header {
  background: #0f172a;
}

.dark .site-logo {
  color: #e2e8f0;
}

.dark .main-nav a {
  color: #94a3b8;
}
.dark .main-nav a:hover,
.dark .main-nav a.active {
  color: #e2e8f0;
}

.dark .card-title a { color: #e2e8f0; }
.dark .card-title a:hover { color: var(--color-accent); }

.dark .article-header h1 { color: #e2e8f0; }

.dark .list-item h2 a { color: #e2e8f0; }
.dark .list-item h2 a:hover { color: var(--color-accent); }

.dark .related-title { color: #e2e8f0; }

.dark .article-content strong { color: #e2e8f0; }

.dark .article-content thead { background: #1e293b; }

.dark .article-content th { border-bottom-color: #94a3b8; }

.dark .error-page h1 { color: #334155; }

/* --- Dark toggle --- */
.dark-toggle {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1rem;
  color: var(--color-text-light);
  transition: border-color 0.15s, color 0.15s;
  flex-shrink: 0;
}
.dark-toggle:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.dark .icon-sun { display: inline; }
.dark .icon-moon { display: none; }
:not(.dark) .icon-sun { display: none; }
:not(.dark) .icon-moon { display: inline; }

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

body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.15s;
}
a:hover { color: var(--color-accent-hover); }

img { max-width: 100%; height: auto; display: block; }

/* --- Header --- */
.site-header {
  border-bottom: 1px solid var(--color-border);
  padding: 0 var(--gap);
}

.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.site-logo {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}
.site-logo:hover { color: var(--color-accent); }

.main-nav {
  display: flex;
  gap: 28px;
}

.main-nav a {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-light);
  letter-spacing: -0.01em;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}
.main-nav a:hover,
.main-nav a.active {
  color: var(--color-text);
  border-bottom-color: var(--color-accent);
}

/* --- Hero (homepage) --- */
.hero {
  padding: 80px var(--gap) 60px;
  text-align: center;
}

.hero-inner {
  max-width: 640px;
  margin: 0 auto;
}

.hero h1 {
  font-family: var(--font-heading);
  font-size: 2.8rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--color-text);
}

.hero-tagline {
  margin-top: 16px;
  font-size: 1.15rem;
  color: var(--color-text-light);
  line-height: 1.5;
}

/* --- Articles grid (homepage) --- */
.articles-grid {
  padding: 0 var(--gap) 80px;
}

.grid-inner {
  max-width: var(--container);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--gap);
}

/* --- Card --- */
.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.15s;
}
.card:hover { border-color: var(--color-accent); }

.card-image img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.card-body {
  padding: 20px 24px 24px;
}

.card-cat {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-accent);
}

.card-title {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.02em;
  margin-top: 8px;
}
.card-title a { color: var(--color-text); }
.card-title a:hover { color: var(--color-accent); }

.card-excerpt {
  margin-top: 10px;
  font-size: 0.92rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

.card-date {
  display: block;
  margin-top: 14px;
  font-size: 0.8rem;
  color: var(--color-text-light);
}

/* --- Section header (list pages) --- */
.section-header {
  max-width: var(--container-narrow);
  margin: 0 auto;
  padding: 60px var(--gap) 32px;
}

.section-header h1 {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* --- Articles list --- */
.articles-list {
  padding: 0 var(--gap) 80px;
}

.list-inner {
  max-width: var(--container-narrow);
  margin: 0 auto;
}

.list-item {
  display: flex;
  gap: 24px;
  align-items: flex-start;
  padding: 28px 0;
  border-bottom: 1px solid var(--color-border);
}

.list-item-body { flex: 1; }

.list-item h2 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin-top: 6px;
}
.list-item h2 a { color: var(--color-text); }
.list-item h2 a:hover { color: var(--color-accent); }

.list-item-image {
  flex-shrink: 0;
  width: 160px;
}
.list-item-image img {
  width: 160px;
  height: 100px;
  object-fit: cover;
  border-radius: var(--radius);
}

/* --- Article single --- */
.article {
  max-width: var(--container-narrow);
  margin: 0 auto;
  padding: 0 var(--gap) 80px;
}

.article-header {
  padding-top: 56px;
  margin-bottom: 40px;
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: 32px;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
  font-size: 0.85rem;
}

.article-cat {
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  text-decoration: none;
}
.article-cat:hover { color: var(--color-accent-hover); }

.meta-sep {
  color: var(--color-border);
}

.article-meta time {
  font-size: 0.85rem;
  color: var(--color-text-light);
}

.article-header h1 {
  font-family: var(--font-heading);
  font-size: 2.4rem;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
}

.article-lead {
  margin-top: 20px;
  font-size: 1.15rem;
  color: var(--color-text-light);
  line-height: 1.6;
  font-style: italic;
}

.article-hero {
  margin-bottom: 36px;
}
.article-hero img {
  border-radius: var(--radius);
}

/* --- Article content --- */
.article-content h2 {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 44px 0 18px;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
}

.article-content h2:first-child {
  border-top: none;
  margin-top: 0;
  padding-top: 0;
}

.article-content h3 {
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  margin: 32px 0 12px;
}

.article-content p {
  margin-bottom: 20px;
}

.article-content > p:first-child {
  font-size: 1.05rem;
  line-height: 1.75;
}

.article-content ul, .article-content ol {
  margin: 0 0 20px 24px;
}

.article-content li {
  margin-bottom: 8px;
  line-height: 1.6;
}

.article-content strong {
  color: var(--color-text);
  font-weight: 600;
}

.article-content blockquote {
  border-left: 3px solid var(--color-accent);
  padding: 12px 0 12px 24px;
  margin: 28px 0;
  color: var(--color-text-light);
  font-style: italic;
  background: var(--color-bg-alt);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.article-content a {
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 2px;
}

.article-content img {
  border-radius: var(--radius);
  margin: 28px 0;
}

/* --- Tables --- */
.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 28px 0;
  font-size: 0.9rem;
  line-height: 1.5;
}

.article-content thead {
  background: var(--color-bg-alt);
}

.article-content th {
  font-family: var(--font-heading);
  font-weight: 600;
  text-align: left;
  padding: 12px 16px;
  border-bottom: 2px solid var(--color-text);
  font-size: 0.85rem;
  letter-spacing: -0.01em;
}

.article-content td {
  padding: 10px 16px;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}

.article-content tbody tr:hover {
  background: var(--color-bg-alt);
}

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

/* "Coût mensuel estimé" callouts */
.article-content p > strong:first-child {
  color: var(--color-accent);
}

/* --- Article footer --- */
.article-footer {
  margin-top: 48px;
  padding-top: 28px;
  border-top: 2px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.article-author-block {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
}

.author-label {
  color: var(--color-text-light);
}

.author-name {
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--color-text);
}

.article-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tag {
  display: inline-block;
  padding: 4px 12px;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 500;
  background: var(--color-bg-alt);
  color: var(--color-text-light);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  text-decoration: none;
  transition: border-color 0.15s, color 0.15s;
}
.tag:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* --- Related articles --- */
.related-articles {
  margin-top: 56px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}

.related-articles h2 {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-text-light);
  margin-bottom: 20px;
}

.related-grid {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.related-item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--color-border);
  text-decoration: none;
  transition: background 0.1s;
}
.related-item:hover {
  background: var(--color-bg-alt);
  padding-left: 12px;
  padding-right: 12px;
  margin-left: -12px;
  margin-right: -12px;
  border-radius: var(--radius);
}

.related-title {
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text);
}
.related-item:hover .related-title { color: var(--color-accent); }

.related-item time {
  font-size: 0.8rem;
  color: var(--color-text-light);
  white-space: nowrap;
}

/* --- Pagination --- */
.pagination {
  max-width: var(--container);
  margin: 40px auto 0;
  padding: 0 var(--gap);
  display: flex;
  justify-content: center;
  gap: 8px;
  list-style: none;
}

.page-link {
  display: inline-block;
  padding: 6px 14px;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text-light);
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}
.page-link:hover { border-color: var(--color-accent); color: var(--color-accent); }
.page-link.active { background: var(--color-accent); color: #fff; border-color: var(--color-accent); }

/* Hugo internal pagination (list pages) */
.page-item a, .page-item span {
  display: inline-block;
  padding: 6px 14px;
  font-family: var(--font-heading);
  font-size: 0.85rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text-light);
}
.page-item a:hover { border-color: var(--color-accent); color: var(--color-accent); }
.page-item.active span { background: var(--color-accent); color: #fff; border-color: var(--color-accent); }

/* --- 404 --- */
.error-page {
  text-align: center;
  padding: 120px var(--gap);
}
.error-page h1 {
  font-family: var(--font-heading);
  font-size: 6rem;
  font-weight: 700;
  color: var(--color-border);
  letter-spacing: -0.04em;
}
.error-page p {
  margin-top: 12px;
  color: var(--color-text-light);
}
.btn {
  display: inline-block;
  margin-top: 24px;
  padding: 10px 24px;
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 600;
  background: var(--color-accent);
  color: #fff;
  border-radius: var(--radius);
  transition: background 0.15s;
}
.btn:hover { background: var(--color-accent-hover); color: #fff; }

/* --- Footer --- */
.site-footer {
  background: var(--color-footer-bg);
  color: var(--color-footer-text);
  padding: 40px var(--gap);
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-nav {
  display: flex;
  gap: 20px;
}
.footer-nav a {
  font-size: 0.85rem;
  color: var(--color-footer-text);
}
.footer-nav a:hover { color: #fff; }

.footer-copy {
  font-size: 0.8rem;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .header-inner { height: 56px; }
  .main-nav { gap: 16px; }
  .main-nav a { font-size: 0.8rem; }
  .hero h1 { font-size: 2rem; }
  .hero { padding: 48px var(--gap) 36px; }
  .grid-inner { grid-template-columns: 1fr; }
  .list-item { flex-direction: column; }
  .list-item-image { width: 100%; }
  .list-item-image img { width: 100%; height: 200px; }
  .article-header h1 { font-size: 1.7rem; }
  .footer-inner { flex-direction: column; gap: 16px; text-align: center; }
}

@media (max-width: 480px) {
  .main-nav a { display: none; }
  .main-nav { gap: 0; }
  .hero h1 { font-size: 1.6rem; }
}