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

:root {
  --navy: #1e2d4a;
  --navy-light: #2a3f68;
  --blue: #3b82f6;
  --blue-light: #60a5fa;
  --green: #16a34a;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-400: #9ca3af;
  --gray-600: #4b5563;
  --gray-800: #1f2937;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: #fff;
  color: var(--gray-800);
  line-height: 1.6;
}

/* ── NAV ── */
.blog-nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(30,45,74,.97);
  backdrop-filter: blur(8px);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 48px; height: 60px;
}
.blog-nav .nav-logo {
  display: flex; align-items: center; gap: 8px;
  text-decoration: none; color: #fff; font-weight: 700; font-size: 16px;
}
.blog-nav .nav-logo-icon {
  width: 32px; height: 32px; background: var(--blue); border-radius: 7px;
  display: flex; align-items: center; justify-content: center; font-size: 16px;
}
.blog-nav .nav-links { display: flex; align-items: center; gap: 24px; }
.blog-nav .nav-links a { color: rgba(255,255,255,.7); text-decoration: none; font-size: 14px; transition: color .2s; }
.blog-nav .nav-links a:hover { color: #fff; }
.blog-nav .nav-cta {
  background: var(--blue); color: #fff !important;
  padding: 7px 18px; border-radius: 7px; font-weight: 600;
}
.blog-nav .nav-cta:hover { background: #2563eb !important; }

/* ── BLOG INDEX ── */
.blog-hero {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%);
  padding: 72px 24px 64px; text-align: center;
}
.blog-hero h1 { color: #fff; font-size: clamp(28px,4vw,48px); font-weight: 800; margin-bottom: 16px; }
.blog-hero p { color: rgba(255,255,255,.65); font-size: 18px; max-width: 520px; margin: 0 auto; }

.blog-grid-section { padding: 72px 24px; max-width: 1100px; margin: 0 auto; }
.blog-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 28px; margin-top: 48px; }

.post-card {
  border: 1px solid var(--gray-100); border-radius: 16px; overflow: hidden;
  transition: box-shadow .2s, transform .2s; text-decoration: none; display: flex; flex-direction: column;
}
.post-card:hover { box-shadow: 0 8px 32px rgba(0,0,0,.08); transform: translateY(-3px); }
.post-card-body { padding: 28px; flex: 1; display: flex; flex-direction: column; }
.post-cat {
  display: inline-block; background: rgba(59,130,246,.1); color: var(--blue);
  font-size: 11px; font-weight: 700; padding: 3px 10px; border-radius: 99px;
  text-transform: uppercase; letter-spacing: .06em; margin-bottom: 14px;
}
.post-card h2 { font-size: 18px; font-weight: 700; color: var(--navy); margin-bottom: 10px; line-height: 1.35; }
.post-card p { font-size: 14px; color: var(--gray-600); line-height: 1.65; flex: 1; }
.post-card-footer {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 20px; padding-top: 16px; border-top: 1px solid var(--gray-100);
}
.post-card-footer time { font-size: 12px; color: var(--gray-400); }
.post-card-footer .read-more { font-size: 13px; font-weight: 600; color: var(--blue); }

/* ── ARTICLE LAYOUT ── */
.article-layout {
  max-width: 1100px; margin: 0 auto;
  display: grid; grid-template-columns: 1fr 300px;
  gap: 64px; padding: 56px 24px 96px;
  align-items: start;
}

/* Article */
article { min-width: 0; }
.article-meta {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  margin-bottom: 20px; font-size: 13px; color: var(--gray-400);
}
.article-cat {
  background: rgba(59,130,246,.1); color: var(--blue);
  font-size: 11px; font-weight: 700; padding: 3px 10px; border-radius: 99px;
  text-transform: uppercase; letter-spacing: .06em;
}
article h1 {
  font-size: clamp(26px, 3.5vw, 42px); font-weight: 800;
  color: var(--navy); line-height: 1.15; margin-bottom: 20px;
}
.article-intro {
  font-size: 18px; color: var(--gray-600); line-height: 1.75;
  margin-bottom: 40px; padding-bottom: 40px;
  border-bottom: 1px solid var(--gray-100);
}

/* Article body typography */
.article-body { font-size: 16px; line-height: 1.8; color: var(--gray-800); }
.article-body h2 {
  font-size: 22px; font-weight: 700; color: var(--navy);
  margin: 40px 0 16px; padding-top: 8px;
}
.article-body h3 { font-size: 18px; font-weight: 700; color: var(--navy); margin: 28px 0 12px; }
.article-body p { margin-bottom: 18px; }
.article-body ul, .article-body ol { margin: 0 0 18px 24px; }
.article-body li { margin-bottom: 8px; }
.article-body strong { color: var(--navy); font-weight: 600; }
.article-body a { color: var(--blue); text-decoration: underline; text-underline-offset: 3px; }
.article-body blockquote {
  border-left: 3px solid var(--blue); padding: 16px 20px;
  background: rgba(59,130,246,.05); border-radius: 0 10px 10px 0;
  margin: 24px 0; font-style: italic; color: var(--gray-600);
}
.article-body .highlight-box {
  background: var(--gray-50); border: 1px solid var(--gray-100);
  border-radius: 12px; padding: 24px 28px; margin: 28px 0;
}
.article-body .highlight-box h4 { font-size: 15px; font-weight: 700; color: var(--navy); margin-bottom: 10px; }

/* Article CTA */
.article-cta {
  margin-top: 56px; background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%);
  border-radius: 16px; padding: 40px; text-align: center;
}
.article-cta h3 { color: #fff; font-size: 22px; font-weight: 700; margin-bottom: 10px; }
.article-cta p { color: rgba(255,255,255,.7); font-size: 15px; margin-bottom: 24px; }
.cta-btn {
  display: inline-block; background: var(--blue); color: #fff;
  padding: 12px 28px; border-radius: 9px; font-weight: 700; font-size: 15px;
  text-decoration: none; transition: background .2s;
}
.cta-btn:hover { background: #2563eb; }

/* Sidebar */
.article-sidebar { position: sticky; top: 80px; display: flex; flex-direction: column; gap: 24px; }
.sidebar-cta {
  background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%);
  border-radius: 14px; padding: 28px; text-align: center;
}
.sidebar-cta-icon { font-size: 32px; margin-bottom: 10px; }
.sidebar-cta h4 { color: #fff; font-weight: 700; font-size: 16px; margin-bottom: 8px; }
.sidebar-cta p { color: rgba(255,255,255,.65); font-size: 13px; line-height: 1.6; margin-bottom: 16px; }
.sidebar-cta a {
  display: block; background: var(--blue); color: #fff;
  padding: 10px 16px; border-radius: 8px; font-weight: 700; font-size: 14px;
  text-decoration: none; transition: background .2s;
}
.sidebar-cta a:hover { background: #2563eb; }
.sidebar-toc {
  background: var(--gray-50); border: 1px solid var(--gray-100);
  border-radius: 14px; padding: 24px;
}
.sidebar-toc h4 { font-size: 13px; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: var(--gray-400); margin-bottom: 14px; }
.sidebar-toc ul { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.sidebar-toc li a { font-size: 13px; color: var(--gray-600); text-decoration: none; transition: color .2s; line-height: 1.4; display: block; }
.sidebar-toc li a:hover { color: var(--blue); }

/* ── FOOTER ── */
.blog-footer {
  background: var(--navy); padding: 32px 48px;
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px;
}
.blog-footer div { color: rgba(255,255,255,.45); font-size: 13px; }
.blog-footer a { color: rgba(255,255,255,.55); text-decoration: none; }
.blog-footer a:hover { color: #fff; }

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  .blog-nav { padding: 0 20px; }
  .blog-nav .nav-links a:not(.nav-cta) { display: none; }
  .article-layout { grid-template-columns: 1fr; gap: 40px; }
  .article-sidebar { position: static; }
  .blog-footer { flex-direction: column; text-align: center; }
}