:root {
  --color-primary: #0d47a1; /* Navy Blue */
  --color-secondary: #1976d2; /* Tech Blue */
  --color-accent: #00bcd4; /* Cyan */
  --color-text: #333333;
  --color-bg: #f8f9fa;
  --color-white: #ffffff;
  --color-border: #e0e0e0;
  --font-base: 'Inter', sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--font-base); color: var(--color-text); line-height: 1.6; background-color: var(--color-bg); }
a { color: var(--color-primary); text-decoration: none; transition: color 0.3s ease; }
a:hover { color: var(--color-accent); }
img { max-width: 100%; height: auto; display: block; }
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }
.container--narrow { max-width: 800px; }

/* HEADER */
.site-header { background: var(--color-white); border-bottom: 1px solid var(--color-border); padding: 15px 0; position: sticky; top: 0; z-index: 100; box-shadow: 0 2px 5px rgba(0,0,0,0.05); }
.site-header__inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; }
.site-nav { display: flex; gap: 20px; font-weight: 600; }
.site-nav a { padding: 5px 0; }
.site-nav a:hover { color: var(--color-secondary); }

/* HERO */
.hero { background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%); color: var(--color-white); padding: 80px 20px; text-align: center; }
.hero-title { font-size: 3rem; margin-bottom: 20px; font-weight: 700; letter-spacing: -0.5px; }
.hero-subtitle { font-size: 1.25rem; max-width: 700px; margin: 0 auto 30px; opacity: 0.9; }
.hero-btn { display: inline-block; background: var(--color-accent); color: var(--color-white); padding: 12px 30px; border-radius: 5px; font-weight: bold; text-transform: uppercase; letter-spacing: 1px; transition: transform 0.2s, background 0.3s; }
.hero-btn:hover { background: #00acc1; transform: translateY(-2px); color: white; }

/* PAGE HEADER */
.page-header { background: var(--color-white); padding: 40px 20px; margin-bottom: 40px; border-bottom: 1px solid var(--color-border); text-align: center; }
.page-title { font-size: 2.2rem; color: var(--color-primary); }

/* MAIN CONTENT */
main { padding: 40px 20px; min-height: 50vh; }
.section-title { font-size: 1.8rem; border-bottom: 2px solid var(--color-accent); padding-bottom: 10px; margin-bottom: 20px; color: var(--color-primary); display: inline-block;}
.grid-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 30px; margin-bottom: 40px; }
.card { background: var(--color-white); border-radius: 8px; overflow: hidden; box-shadow: 0 4px 15px rgba(0,0,0,0.05); padding: 25px; transition: transform 0.3s; border-top: 4px solid var(--color-secondary); }
.card:hover { transform: translateY(-5px); box-shadow: 0 8px 25px rgba(0,0,0,0.1); }
.card h3 { margin-bottom: 15px; font-size: 1.4rem; }
.card p { color: #666; margin-bottom: 20px; font-size: 0.95rem; }

/* ARTICLE BODY */
.content-body { max-width: 800px; margin: 0 auto; background: var(--color-white); padding: 40px; border-radius: 8px; box-shadow: 0 2px 10px rgba(0,0,0,0.03); }
.content-body h2 { font-size: 1.8rem; color: var(--color-primary); margin: 30px 0 15px; }
.content-body h3 { font-size: 1.4rem; color: var(--color-secondary); margin: 25px 0 10px; }
.content-body p { margin-bottom: 20px; font-size: 1.1rem; line-height: 1.8; color: #444; }
.content-body ul, .content-body ol { margin-bottom: 20px; padding-left: 20px; font-size: 1.1rem; }
.content-body li { margin-bottom: 10px; }
.lead { font-size: 1.25rem !important; font-weight: 600; color: #555 !important; border-left: 4px solid var(--color-accent); padding-left: 15px; }
.article-image { margin: 30px 0; }
.article-image img { width: 100%; border-radius: 8px; box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
.article-image figcaption { text-align: center; font-style: italic; color: #777; margin-top: 10px; font-size: 0.9rem; }

/* BREADCRUMB & META */
.breadcrumb { max-width: 800px; margin: 0 auto 20px; font-size: 0.9rem; color: #666; }
.breadcrumb a { color: var(--color-primary); }
.article-meta { max-width: 800px; margin: 0 auto 30px; display: flex; align-items: center; gap: 15px; font-size: 0.95rem; color: #666; padding-bottom: 15px; border-bottom: 1px solid var(--color-border); }

/* AUTHOR BOX */
.author-box { display: flex; gap: 20px; background: #f0f4f8; padding: 25px; border-radius: 8px; margin: 40px auto; max-width: 800px; align-items: center; border-left: 4px solid var(--color-primary); }
.author-box__avatar img { border-radius: 50%; object-fit: cover; border: 2px solid var(--color-white); box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.author-box__info h3 { color: var(--color-primary); margin-bottom: 5px; }
.author-box__info p { margin-bottom: 0; font-size: 0.95rem; }

/* RELATED POSTS */
.related-posts { max-width: 800px; margin: 0 auto 40px; background: var(--color-white); padding: 30px; border-radius: 8px; }
.related-posts h3 { margin-bottom: 20px; font-size: 1.4rem; color: var(--color-primary); }
.related-posts ul { list-style: none; padding: 0; }
.related-posts li { margin-bottom: 15px; padding-bottom: 15px; border-bottom: 1px dashed var(--color-border); }
.related-posts li::before { content: "»"; color: var(--color-accent); margin-right: 10px; font-weight: bold; }
.related-posts li:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }

/* FOOTER */
.site-footer { background: #111827; color: #d1d5db; padding: 60px 20px 20px; margin-top: 40px; }
.footer-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 40px; margin-bottom: 40px; }
.footer-col h3 { color: var(--color-white); margin-bottom: 20px; font-size: 1.2rem; }
.footer-col ul { list-style: none; padding: 0; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { color: #9ca3af; }
.footer-col a:hover { color: var(--color-white); }
.footer-bottom { text-align: center; padding-top: 20px; border-top: 1px solid #374151; font-size: 0.9rem; }

@media (max-width: 768px) {
  .hero-title { font-size: 2rem; }
  .content-body { padding: 20px; }
  .author-box { flex-direction: column; text-align: center; }
}