/* =====================================================
   main.css — Jekyll SEO Site Design System
   ===================================================== */

/* --- Google Font --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

/* --- CSS Variables --- */
:root {
  --color-bg:         #0d0f17;
  --color-surface:    #151824;
  --color-surface-2:  #1c2033;
  --color-border:     rgba(255,255,255,0.08);
  --color-primary:    #6c63ff;
  --color-primary-h:  #8b85ff;
  --color-accent:     #00d4aa;
  --color-text:       #e2e8f0;
  --color-muted:      #8892a4;
  --color-heading:    #f0f4ff;
  --radius-sm:        6px;
  --radius-md:        12px;
  --radius-lg:        20px;
  --shadow-glow:      0 0 40px rgba(108,99,255,0.15);
  --font-sans:        'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --transition:       0.2s ease;
  --container-max:    1200px;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
#main-content { flex: 1; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary-h); }

/* --- Container --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* =====================================================
   HEADER
   ===================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13,15,23,0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.site-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-heading) !important;
  text-decoration: none;
}
.logo-icon { font-size: 1.4rem; }
.site-nav { display: flex; align-items: center; gap: 0.25rem; }
.nav-link {
  color: var(--color-muted);
  font-weight: 500;
  font-size: 0.9rem;
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.nav-link:hover { color: var(--color-text); background: rgba(255,255,255,0.06); }
.nav-cta {
  background: var(--color-primary);
  color: #fff !important;
  font-weight: 600;
  font-size: 0.875rem;
  padding: 0.5rem 1.1rem;
  border-radius: var(--radius-sm);
  margin-left: 0.5rem;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}
.nav-cta:hover { background: var(--color-primary-h); transform: translateY(-1px); box-shadow: 0 4px 20px rgba(108,99,255,0.4); }
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
}

/* =====================================================
   HERO
   ===================================================== */
.hero {
  padding: 5rem 1.5rem 4rem;
  text-align: center;
  background:
    radial-gradient(ellipse 80% 60% at 50% -10%, rgba(108,99,255,0.2) 0%, transparent 60%),
    var(--color-bg);
}
.hero-badge {
  display: inline-block;
  background: rgba(108,99,255,0.15);
  border: 1px solid rgba(108,99,255,0.35);
  color: var(--color-primary-h);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.3rem 0.9rem;
  border-radius: 999px;
  letter-spacing: 0.04em;
  margin-bottom: 1.25rem;
}
.hero-title {
  font-size: clamp(2.2rem, 6vw, 3.8rem);
  font-weight: 800;
  color: var(--color-heading);
  line-height: 1.15;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, #f0f4ff 0%, #a5b4fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle {
  font-size: 1.1rem;
  color: var(--color-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* =====================================================
   POSTS SECTION & GRID
   ===================================================== */
.posts-section { padding: 3rem 0 5rem; }
.section-title {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--color-heading);
  margin-bottom: 2rem;
  position: relative;
  padding-left: 1rem;
}
.section-title::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 1.4em;
  background: linear-gradient(180deg, var(--color-primary), var(--color-accent));
  border-radius: 4px;
}

.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.75rem;
}

.post-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.post-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
  border-color: rgba(108,99,255,0.3);
}
.post-card-image-link img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.post-card:hover .post-card-image-link img { transform: scale(1.03); }

.post-card-body { padding: 1.5rem; flex: 1; display: flex; flex-direction: column; gap: 0.75rem; }
.post-card-meta { display: flex; align-items: center; gap: 0.75rem; }
.post-card-meta time { font-size: 0.8rem; color: var(--color-muted); }
.post-card-title { font-size: 1.15rem; font-weight: 700; line-height: 1.35; }
.post-card-title a { color: var(--color-heading); }
.post-card-title a:hover { color: var(--color-primary-h); }
.post-card-excerpt { font-size: 0.9rem; color: var(--color-muted); flex: 1; }
.read-more-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-top: auto;
  transition: gap var(--transition);
}
.read-more-btn:hover { gap: 0.6rem; }

/* Badges & chips */
.category-badge {
  display: inline-block;
  background: rgba(108,99,255,0.15);
  border: 1px solid rgba(108,99,255,0.3);
  color: var(--color-primary-h);
  font-size: 0.72rem;
  font-weight: 600;
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: background var(--transition);
}
.category-badge:hover { background: rgba(108,99,255,0.3); color: #fff; }

.tag-chip {
  display: inline-block;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 0.8rem;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition), border-color var(--transition);
}
.tag-chip:hover { color: var(--color-text); border-color: var(--color-primary); }

/* Pagination */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 3rem;
}
.pagination-btn {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.9rem;
  transition: all var(--transition);
}
.pagination-btn:hover { background: var(--color-primary); border-color: var(--color-primary); color: #fff; }
.pagination-info { font-size: 0.875rem; color: var(--color-muted); }

/* =====================================================
   POST ARTICLE
   ===================================================== */
.post-article {
  max-width: 780px;
  margin: 3rem auto;
  padding: 0 1.5rem;
}
.post-header { margin-bottom: 2.5rem; }
.post-meta-top { margin-bottom: 1rem; }
.post-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  color: var(--color-heading);
  line-height: 1.2;
  margin-bottom: 1rem;
}
.post-description { font-size: 1.1rem; color: var(--color-muted); margin-bottom: 1.25rem; }
.post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.25rem;
  padding: 1rem 1.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  color: var(--color-muted);
}
.post-meta > span { display: flex; align-items: center; gap: 0.4rem; }
.icon { width: 16px; height: 16px; fill: currentColor; opacity: 0.7; }
.post-hero-image { margin-top: 1.75rem; border-radius: var(--radius-lg); overflow: hidden; }
.post-hero-image img { width: 100%; max-height: 480px; object-fit: cover; }

/* --- Prose / Content --- */
.post-content { font-size: 1.0625rem; line-height: 1.8; }
.post-content h1,
.post-content h2,
.post-content h3,
.post-content h4 {
  color: var(--color-heading);
  font-weight: 700;
  margin: 2.25rem 0 0.85rem;
  line-height: 1.25;
}
.post-content h1 { font-size: 2rem; }
.post-content h2 { font-size: 1.5rem; border-bottom: 1px solid var(--color-border); padding-bottom: 0.5rem; }
.post-content h3 { font-size: 1.2rem; }
.post-content p  { margin-bottom: 1.25rem; }
.post-content ul,
.post-content ol { margin: 1rem 0 1.25rem 1.5rem; }
.post-content li { margin-bottom: 0.4rem; }
.post-content a  { color: var(--color-primary); text-decoration: underline; text-underline-offset: 3px; }
.post-content a:hover { color: var(--color-primary-h); }
.post-content strong { color: var(--color-heading); font-weight: 700; }
.post-content code {
  background: var(--color-surface-2);
  padding: 0.15em 0.45em;
  border-radius: 4px;
  font-size: 0.9em;
  font-family: 'Courier New', monospace;
  color: var(--color-accent);
}
.post-content pre {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  overflow-x: auto;
  margin: 1.5rem 0;
}
.post-content pre code { background: none; padding: 0; color: var(--color-text); font-size: 0.9rem; }
.post-content blockquote {
  border-left: 4px solid var(--color-primary);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  background: rgba(108,99,255,0.06);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--color-text);
  font-style: italic;
}
.post-content img {
  border-radius: var(--radius-md);
  margin: 1.5rem auto;
}
.post-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.9rem;
}
.post-content th { background: var(--color-surface-2); color: var(--color-heading); font-weight: 600; }
.post-content th,
.post-content td {
  border: 1px solid var(--color-border);
  padding: 0.65rem 1rem;
  text-align: left;
}
.post-content tr:nth-child(even) { background: rgba(255,255,255,0.02); }

/* Tags */
.post-tags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--color-border);
}
.tags-label { font-size: 0.875rem; color: var(--color-muted); font-weight: 500; }

/* Share */
.share-section {
  margin-top: 2.5rem;
  padding: 1.75rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-align: center;
}
.share-title { font-size: 1rem; font-weight: 600; color: var(--color-heading); margin-bottom: 1rem; }
.share-buttons { display: flex; justify-content: center; gap: 0.75rem; flex-wrap: wrap; }
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  transition: all var(--transition);
  cursor: pointer;
}
.share-twitter  { background: #000; color: #fff; border: 1px solid #333; }
.share-linkedin { background: #0a66c2; color: #fff; }
.share-copy     { background: var(--color-surface-2); color: var(--color-text); border: 1px solid var(--color-border); }
.share-btn:hover { transform: translateY(-2px); opacity: 0.9; color: #fff; }

/* =====================================================
   FOOTER
   ===================================================== */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  margin-top: auto;
}
.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 3rem;
  padding: 3rem 1.5rem 2rem;
}
.footer-brand { max-width: 280px; }
.footer-tagline { font-size: 0.875rem; color: var(--color-muted); margin-top: 0.75rem; line-height: 1.6; }
.footer-links { display: flex; gap: 4rem; }
.footer-col { display: flex; flex-direction: column; gap: 0.6rem; }
.footer-col h4 { font-size: 0.8rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.07em; color: var(--color-muted); margin-bottom: 0.5rem; }
.footer-col a { font-size: 0.9rem; color: var(--color-muted); transition: color var(--transition); }
.footer-col a:hover { color: var(--color-text); }
.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding: 1.25rem 1.5rem;
  text-align: center;
}
.footer-bottom p { font-size: 0.8rem; color: var(--color-muted); }
.affiliate-notice { margin-top: 0.3rem; font-style: italic; }

/* =====================================================
   PAGE CONTENT
   ===================================================== */
.page-content {
  max-width: 780px;
  margin: 3rem auto;
  padding: 0 1.5rem;
}

/* =====================================================
   RESPONSIVE
   ===================================================== */
@media (max-width: 768px) {
  .site-nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(21,24,36,0.97);
    backdrop-filter: blur(16px);
    padding: 1rem;
    border-bottom: 1px solid var(--color-border);
    gap: 0.25rem;
  }
  .site-nav.is-open { display: flex; }
  .nav-toggle { display: flex; }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-links { flex-wrap: wrap; gap: 2rem; }
  .posts-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .share-buttons { flex-direction: column; align-items: stretch; }
  .share-btn { justify-content: center; }
}