@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;1,9..40,300&display=swap');

:root {
  --bg:         #0d0f14;
  --bg-card:    #13161d;
  --bg-hover:   #1a1e28;
  --border:     rgba(255,255,255,0.07);
  --border-mid: rgba(255,255,255,0.13);
  --accent:     #5ee7a0;
  --accent-dim: #2a7a52;
  --text-1:     #f0f2f5;
  --text-2:     #8b909e;
  --text-3:     #545969;
  --serif:      'DM Serif Display', Georgia, serif;
  --sans:       'DM Sans', system-ui, sans-serif;
  --radius:     10px;
  --radius-lg:  18px;
  --max-w:      1120px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body { background: var(--bg); color: var(--text-1); font-family: var(--sans); font-size: 17px; line-height: 1.7; min-height: 100vh; }
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 2rem; }
.site-header { border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 100; background: rgba(13,15,20,0.92); backdrop-filter: blur(12px); }
.header-inner { max-width: var(--max-w); margin: 0 auto; padding: 0 2rem; height: 64px; display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.site-logo { font-family: var(--serif); font-size: 1.35rem; color: var(--text-1); display: flex; align-items: center; gap: 10px; }
.logo-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); flex-shrink: 0; }
.site-nav { display: flex; align-items: center; gap: 0.25rem; }
.site-nav a { font-size: 0.875rem; color: var(--text-2); padding: 0.4rem 0.85rem; border-radius: var(--radius); transition: color 0.15s, background 0.15s; }
.site-nav a:hover { color: var(--text-1); background: var(--bg-hover); }
.hero { padding: 6rem 0 5rem; border-bottom: 1px solid var(--border); }
.hero-tag { display: inline-flex; align-items: center; gap: 6px; font-size: 1.1rem; font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); margin-bottom: 1.5rem; }
.hero-tag::before { content: ''; width: 20px; height: 1px; background: var(--accent); }
.hero h1 { font-family: var(--serif); font-size: clamp(2.4rem, 5vw, 4rem); line-height: 1.15; letter-spacing: -0.02em; color: var(--text-1); max-width: 700px; margin-bottom: 1.25rem; }
.hero h1 em { font-style: italic; color: var(--accent); }
.hero-desc { font-size: 1.05rem; color: var(--text-2); max-width: 520px; margin-bottom: 2.5rem; font-weight: 300; }
.hero-stats { display: flex; gap: 2.5rem; flex-wrap: wrap; }
.hero-stat { display: flex; flex-direction: column; gap: 2px; }
.hero-stat-num { font-family: var(--serif); font-size: 1.5rem; color: var(--text-1); }
.hero-stat-label { font-size: 0.92rem; color: var(--text-3); text-transform: uppercase; letter-spacing: 0.08em; }
.articles-section { padding: 4rem 0; }
.section-header { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 2rem; }
.section-title { font-family: var(--serif); font-size: 1.5rem; color: var(--text-1); }
.section-link { font-size: 0.82rem; color: var(--text-3); border-bottom: 1px solid var(--border); padding-bottom: 1px; transition: color 0.15s; }
.section-link:hover { color: var(--accent); }
.article-featured { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; background: var(--border); border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; margin-bottom: 1px; }
.article-featured-content { background: var(--bg-card); padding: 2.5rem; display: flex; flex-direction: column; justify-content: space-between; }
.article-featured-image { background: var(--bg-hover); min-height: 320px; display: flex; align-items: center; justify-content: center; font-size: 4rem; opacity: 0.15; }
.articles-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1px; background: var(--border); border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; }
.article-card { background: var(--bg-card); padding: 1.75rem; display: flex; flex-direction: column; gap: 0.75rem; transition: background 0.15s; }
.article-card:hover { background: var(--bg-hover); }
.article-card:hover .card-title { color: var(--accent); }
.card-meta { display: flex; align-items: center; gap: 0.75rem; flex-wrap: wrap; }
.card-category { font-size: 0.72rem; font-weight: 500; letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); background: rgba(94,231,160,0.08); padding: 0.2rem 0.6rem; border-radius: 4px; }
.card-date { font-size: 0.8rem; color: var(--text-3); }
.card-title { font-family: var(--serif); font-size: 1.2rem; line-height: 1.3; color: var(--text-1); transition: color 0.15s; }
.article-featured .card-title { font-size: 1.65rem; margin-bottom: 0.5rem; }
.card-excerpt { font-size: 0.9rem; color: var(--text-2); line-height: 1.6; font-weight: 300; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.card-footer { margin-top: auto; display: flex; align-items: center; justify-content: space-between; padding-top: 0.75rem; border-top: 1px solid var(--border); }
.card-reading-time { font-size: 0.92rem; color: var(--text-3); }
.card-arrow { width: 28px; height: 28px; border-radius: 50%; border: 1px solid var(--border-mid); display: flex; align-items: center; justify-content: center; color: var(--text-3); transition: border-color 0.15s, color 0.15s; }
.article-card:hover .card-arrow { border-color: var(--accent-dim); color: var(--accent); }
.article-layout { display: grid; grid-template-columns: 1fr 280px; gap: 4rem; max-width: 1060px; margin: 0 auto; padding: 3rem 2rem 5rem; align-items: start; }
.article-header { margin-bottom: 3rem; padding-bottom: 2.5rem; border-bottom: 1px solid var(--border); }
.article-title { font-family: var(--serif); font-size: clamp(1.8rem, 4vw, 2.75rem); line-height: 1.2; letter-spacing: -0.02em; color: var(--text-1); margin-bottom: 1rem; }
.article-desc { font-size: 1.05rem; color: var(--text-2); font-weight: 300; line-height: 1.65; }
.article-body { color: var(--text-2); font-size: 1rem; line-height: 1.85; }
.article-body h2 { font-family: var(--serif); font-size: 1.6rem; color: var(--text-1); margin: 2.5rem 0 1rem; line-height: 1.3; }
.article-body h3 { font-size: 1.1rem; font-weight: 500; color: var(--text-1); margin: 2rem 0 0.75rem; }
.article-body p { margin-bottom: 1.5rem; }
.article-body a { color: var(--accent); border-bottom: 1px solid var(--accent-dim); }
.article-body a:hover { border-color: var(--accent); }
.article-body ul, .article-body ol { padding-left: 1.5rem; margin-bottom: 1.5rem; }
.article-body li { margin-bottom: 0.5rem; }
.article-body blockquote { border-left: 3px solid var(--accent); padding: 0.5rem 0 0.5rem 1.5rem; margin: 2rem 0; font-family: var(--serif); font-size: 1.15rem; font-style: italic; color: var(--text-2); }
.article-body code { font-size: 0.85em; background: var(--bg-hover); border: 1px solid var(--border); padding: 0.15em 0.45em; border-radius: 5px; color: var(--accent); }
.article-body pre { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; overflow-x: auto; margin: 2rem 0; }
.article-body pre code { background: none; border: none; padding: 0; color: var(--text-2); }
.article-body table { width: 100%; border-collapse: collapse; margin: 2rem 0; font-size: 0.9rem; }
.article-body th { text-align: left; padding: 0.75rem 1rem; background: var(--bg-hover); color: var(--text-1); font-weight: 500; font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.06em; border-bottom: 1px solid var(--border-mid); }
.article-body td { padding: 0.75rem 1rem; border-bottom: 1px solid var(--border); vertical-align: top; }
.faq-section { margin-top: 3rem; padding-top: 2.5rem; border-top: 1px solid var(--border); }
.faq-title { font-family: var(--serif); font-size: 1.6rem; color: var(--text-1); margin-bottom: 1.5rem; }
.faq-item { border-bottom: 1px solid var(--border); padding: 1.25rem 0; }
.faq-question { font-weight: 500; color: var(--text-1); font-size: 0.95rem; margin-bottom: 0.5rem; }
.faq-answer { font-size: 0.92rem; color: var(--text-2); line-height: 1.75; }
.article-sidebar { position: sticky; top: 80px; display: flex; flex-direction: column; gap: 1.5rem; }
.sidebar-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 1.5rem; }
.sidebar-card-title { font-size: 0.72rem; font-weight: 500; text-transform: uppercase; letter-spacing: 0.12em; color: var(--text-3); margin-bottom: 1rem; }
.toc-list { list-style: none; display: flex; flex-direction: column; gap: 0.4rem; }
.toc-list a { font-size: 0.85rem; color: var(--text-2); display: block; padding: 0.2rem 0 0.2rem 0.75rem; border-left: 2px solid transparent; line-height: 1.45; transition: color 0.15s; }
.toc-list a:hover, .toc-list a.active { color: var(--accent); border-left-color: var(--accent); }
.related-list { display: flex; flex-direction: column; gap: 1rem; }
.related-item { display: flex; flex-direction: column; gap: 0.25rem; padding-bottom: 1rem; border-bottom: 1px solid var(--border); }
.related-item:last-child { border-bottom: none; padding-bottom: 0; }
.related-title { font-size: 0.88rem; color: var(--text-1); font-family: var(--serif); line-height: 1.4; transition: color 0.15s; }
.related-item:hover .related-title { color: var(--accent); }
.related-date { font-size: 0.75rem; color: var(--text-3); }
.site-footer { border-top: 1px solid var(--border); padding: 3rem 0; margin-top: 4rem; }
.footer-inner { max-width: var(--max-w); margin: 0 auto; padding: 0 2rem; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 1.5rem; }
.footer-brand { font-family: var(--serif); font-size: 1.1rem; color: var(--text-2); }
.footer-links { display: flex; gap: 1.5rem; }
.footer-links a { font-size: 0.82rem; color: var(--text-3); transition: color 0.15s; }
.footer-links a:hover { color: var(--text-2); }
.footer-copy { width: 100%; font-size: 0.92rem; color: var(--text-3); padding-top: 1.5rem; border-top: 1px solid var(--border); margin-top: 0.5rem; }
@media (max-width: 900px) {
  .article-featured { grid-template-columns: 1fr; }
  .article-layout { grid-template-columns: 1fr; }
  .article-sidebar { position: static; }
  .hero { padding: 4rem 0 3rem; }
}
@media (max-width: 600px) {
  .container, .header-inner, .footer-inner { padding-left: 1.25rem; padding-right: 1.25rem; }
  .articles-grid { grid-template-columns: 1fr; }
  .article-layout { padding: 2rem 1.25rem 4rem; }
  .site-nav { display: none; }
}