:root{
  --c-primary:#1A56DB;
  --c-primary-alt:#0D6EFD;
  --c-cyan:#06B6D4;
  --c-bg:#06102B;
  --c-bg-2:#0B1838;
  --c-surface:#0F1F44;
  --c-surface-border:#1E3362;
  --c-text:#E7ECF7;
  --c-text-muted:#92A1C4;
  --c-text-dim:#5E6D92;
  --c-tag-bg:rgba(13,110,253,0.14);
  --c-tag-border:rgba(13,110,253,0.35);
  --font-heading:'Sora',sans-serif;
  --font-body:'Inter',sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{
  font-family:var(--font-body);
  background:var(--c-bg);
  color:var(--c-text);
  line-height:1.5;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;}
.wrap{max-width:1280px;margin:0 auto;padding:0 32px;}
.skip-link{position:absolute;left:-9999px;top:0;background:var(--c-primary);color:#fff;padding:10px 16px;z-index:999;}
.skip-link:focus{left:16px;top:16px;}
.sr-only{position:absolute;left:-9999px;}

/* ===== Header ===== */
header.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(6,16,43,0.88);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--c-surface-border);
}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:76px;}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--font-heading);font-weight:800;font-size:1.3rem;letter-spacing:-0.01em;}
.brand-mark{
  width:34px;height:34px;border-radius:9px;
  background:linear-gradient(135deg,var(--c-primary) 0%,var(--c-cyan) 100%);
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-heading);font-weight:800;color:#fff;font-size:1rem;
  flex:none;
}
.brand small{display:block;font-family:var(--font-body);font-weight:600;font-size:0.62rem;letter-spacing:0.14em;color:var(--c-cyan);text-transform:uppercase;margin-top:1px;}
nav.primary-nav{display:flex;align-items:center;gap:36px;}
nav.primary-nav a{font-size:0.92rem;font-weight:500;color:var(--c-text-muted);transition:color .15s;}
nav.primary-nav a:hover,nav.primary-nav a.active{color:#fff;}
nav.primary-nav a.active{color:var(--c-cyan);}
.header-actions{display:flex;align-items:center;gap:14px;}
.search-btn{
  display:flex;align-items:center;gap:10px;
  background:var(--c-surface);border:1px solid var(--c-surface-border);
  border-radius:8px;padding:8px 12px;color:var(--c-text-dim);font-size:0.85rem;cursor:pointer;
}
.search-btn kbd{background:var(--c-bg-2);border:1px solid var(--c-surface-border);border-radius:4px;padding:1px 6px;font-size:0.72rem;color:var(--c-text-muted);}
.cta-btn{
  background:linear-gradient(135deg,var(--c-primary) 0%,var(--c-primary-alt) 100%);
  color:#fff;padding:9px 18px;border-radius:8px;font-size:0.85rem;font-weight:600;white-space:nowrap;
}

/* ===== Layout ===== */
main{padding:40px 0 80px;}
.layout{display:grid;grid-template-columns:240px 1fr;gap:48px;align-items:start;}
.layout--article{grid-template-columns:1fr 320px;}

/* ===== Sidebar: topics ===== */
aside.topics{position:sticky;top:96px;}
aside.topics h2{
  font-family:var(--font-body);font-size:0.72rem;font-weight:700;letter-spacing:0.12em;
  color:var(--c-text-dim);text-transform:uppercase;margin-bottom:16px;
}
.topic-list{list-style:none;display:flex;flex-direction:column;}
.topic-list li a{
  display:flex;align-items:center;justify-content:space-between;
  padding:9px 10px;border-radius:7px;font-size:0.88rem;color:var(--c-text-muted);
}
.topic-list li a:hover{background:var(--c-surface);color:#fff;}
.topic-list li a.active{background:var(--c-tag-bg);color:var(--c-cyan);font-weight:600;}
.topic-list li a span.count{font-size:0.76rem;color:var(--c-text-dim);}
.topic-list li a.active span.count{color:var(--c-cyan);}

/* ===== Hero / Featured ===== */
.featured{
  display:block;border:1px solid var(--c-surface-border);border-radius:16px;overflow:hidden;
  background:var(--c-surface);margin-bottom:56px;transition:border-color .15s;
}
.featured:hover{border-color:var(--c-primary-alt);}
.featured-media{aspect-ratio:16/6.2;width:100%;position:relative;overflow:hidden;}
.featured-media svg{position:absolute;inset:0;width:100%;height:100%;}
.featured-body{padding:28px 32px 32px;}
.tag-row{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:14px;}
.tag{
  font-size:0.68rem;font-weight:700;letter-spacing:0.05em;text-transform:uppercase;
  background:var(--c-tag-bg);border:1px solid var(--c-tag-border);color:var(--c-cyan);
  padding:4px 10px;border-radius:5px;
}
.featured-body h1{
  font-family:var(--font-heading);font-size:clamp(1.6rem,2.6vw,2.2rem);font-weight:700;
  letter-spacing:-0.01em;margin-bottom:12px;max-width:46ch;
}
.featured-body p.excerpt{color:var(--c-text-muted);font-size:1rem;max-width:62ch;margin-bottom:20px;}
.byline{display:flex;align-items:center;gap:10px;font-size:0.85rem;color:var(--c-text-dim);flex-wrap:wrap;}
.avatar{width:30px;height:30px;border-radius:50%;background:linear-gradient(135deg,var(--c-cyan),var(--c-primary));flex:none;}
.byline b{color:var(--c-text-muted);font-weight:600;}
.dot{width:3px;height:3px;border-radius:50%;background:var(--c-text-dim);flex:none;}
.readtime{background:var(--c-bg-2);border:1px solid var(--c-surface-border);padding:2px 9px;border-radius:20px;font-size:0.75rem;}

/* ===== Section heading ===== */
.section-head{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:22px;}
.section-head h2{font-family:var(--font-heading);font-size:1.25rem;font-weight:700;}
.section-head a{font-size:0.85rem;color:var(--c-cyan);font-weight:600;}

/* ===== Page hero (category) ===== */
.page-hero{margin-bottom:40px;}
.page-hero h1{font-family:var(--font-heading);font-size:clamp(1.6rem,3vw,2.1rem);font-weight:700;margin-bottom:8px;}
.page-hero p{color:var(--c-text-muted);}

/* ===== Article grid ===== */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:56px;}
.card{
  border:1px solid var(--c-surface-border);border-radius:14px;overflow:hidden;
  background:var(--c-surface);display:flex;flex-direction:column;
  transition:transform .15s, border-color .15s;
}
.card:hover{transform:translateY(-3px);border-color:var(--c-primary-alt);}
.card-media{aspect-ratio:16/10;position:relative;overflow:hidden;border-bottom:3px solid var(--accent,var(--c-primary-alt));}
.card-media svg{width:100%;height:100%;}
.card-body{padding:18px 20px 20px;display:flex;flex-direction:column;gap:10px;flex:1;}
.card-body .tag-row{margin-bottom:0;}
.card-body h3{font-family:var(--font-heading);font-size:1.02rem;font-weight:700;line-height:1.35;}
.card-body h3 a{transition:color .15s;}
.card:hover h3 a{color:var(--c-cyan);}
.card-meta{margin-top:auto;display:flex;align-items:center;gap:8px;font-size:0.78rem;color:var(--c-text-dim);}
.grid--empty{color:var(--c-text-dim);font-size:0.95rem;padding:32px 0;}

.divider{height:1px;background:var(--c-surface-border);margin:0 0 48px;}

/* ===== Pagination ===== */
.pagination{display:flex;justify-content:center;align-items:center;gap:8px;}
.pagination a,.pagination span{
  width:38px;height:38px;display:flex;align-items:center;justify-content:center;
  border-radius:8px;border:1px solid var(--c-surface-border);font-size:0.85rem;color:var(--c-text-muted);
}
.pagination a.active{background:var(--c-primary);border-color:var(--c-primary);color:#fff;font-weight:700;}
.pagination a:hover:not(.active):not(.disabled){border-color:var(--c-primary-alt);color:#fff;}
.pagination a.disabled,.pagination span.disabled{opacity:0.35;pointer-events:none;}

/* ===== Newsletter ===== */
.newsletter{
  margin:72px 0 0;padding:44px 40px;border-radius:18px;
  background:linear-gradient(120deg,#0C1F52 0%,#0B3A66 100%);
  border:1px solid var(--c-surface-border);
  display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap;
}
.newsletter h2{font-family:var(--font-heading);font-size:1.4rem;margin-bottom:6px;}
.newsletter p{color:var(--c-text-muted);font-size:0.92rem;max-width:40ch;}
.newsletter form{display:flex;gap:10px;flex:none;}
.newsletter input[type=email]{
  width:260px;padding:12px 14px;border-radius:8px;border:1px solid var(--c-surface-border);
  background:rgba(6,16,43,0.6);color:#fff;font-size:0.88rem;
}
.newsletter input::placeholder{color:var(--c-text-dim);}
.newsletter button{
  background:#fff;color:#0B1838;border:none;padding:12px 20px;border-radius:8px;font-weight:700;font-size:0.88rem;cursor:pointer;
}

/* ===== Article detail ===== */
.breadcrumbs{display:flex;align-items:center;gap:8px;font-size:0.82rem;color:var(--c-text-dim);margin-bottom:22px;flex-wrap:wrap;}
.breadcrumbs a:hover{color:var(--c-cyan);}
.article-hero-media{aspect-ratio:16/7;border-radius:16px;overflow:hidden;border:1px solid var(--c-surface-border);margin-bottom:24px;position:relative;}
.article-hero-media svg{position:absolute;inset:0;width:100%;height:100%;}
.article-head h1{font-family:var(--font-heading);font-size:clamp(1.7rem,3.2vw,2.4rem);font-weight:700;line-height:1.25;margin:14px 0 18px;max-width:38ch;}
.prose{font-size:1.02rem;color:var(--c-text);}
.prose p{margin-bottom:20px;color:var(--c-text-muted);}
.prose h2{font-family:var(--font-heading);font-size:1.3rem;font-weight:700;margin:36px 0 16px;color:#fff;}
.prose code{background:var(--c-surface);border:1px solid var(--c-surface-border);padding:2px 6px;border-radius:5px;font-size:0.88em;color:var(--c-cyan);}
.article-foot{margin-top:40px;padding-top:28px;border-top:1px solid var(--c-surface-border);display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;}
.share-row{display:flex;align-items:center;gap:10px;}
.share-row span{font-size:0.72rem;letter-spacing:0.1em;color:var(--c-text-dim);text-transform:uppercase;margin-right:6px;}
.share-btn{
  width:36px;height:36px;border-radius:50%;border:1px solid var(--c-surface-border);
  display:flex;align-items:center;justify-content:center;color:var(--c-text-muted);transition:border-color .15s, color .15s;
}
.share-btn:hover{border-color:var(--c-cyan);color:var(--c-cyan);}

/* Sidebar: recent (CSR) */
aside.detail-sidebar{display:flex;flex-direction:column;gap:32px;position:sticky;top:96px;}
.sidebar-block h2{
  font-size:0.72rem;font-weight:700;letter-spacing:0.12em;text-transform:uppercase;color:var(--c-text-dim);margin-bottom:16px;
}
.sidebar-list{list-style:none;display:flex;flex-direction:column;}
.sidebar-item{display:flex;gap:12px;padding:10px 0;border-bottom:1px solid var(--c-surface-border);}
.sidebar-item:last-child{border-bottom:none;}
.sidebar-thumb{width:56px;height:56px;border-radius:8px;flex:none;overflow:hidden;}
.sidebar-thumb svg{width:100%;height:100%;}
.sidebar-item h3{font-size:0.86rem;font-weight:600;line-height:1.3;margin-bottom:4px;}
.sidebar-item time{font-size:0.75rem;color:var(--c-text-dim);}
.sidebar-view-all{display:inline-block;margin-top:14px;font-size:0.85rem;color:var(--c-cyan);font-weight:600;}

/* Loading skeletons (CSR placeholders) */
.skeleton{background:linear-gradient(90deg,var(--c-surface) 25%,var(--c-surface-border) 37%,var(--c-surface) 63%);background-size:400% 100%;animation:skeleton-loading 1.4s ease infinite;border-radius:8px;}
@keyframes skeleton-loading{0%{background-position:100% 50%;}100%{background-position:0 50%;}}
.skeleton-line{height:12px;margin-bottom:8px;}
.skeleton-thumb{width:56px;height:56px;border-radius:8px;flex:none;}
.skeleton-card{aspect-ratio:16/10;border-radius:14px;}

/* Related articles (CSR) */
.related-section{margin-top:64px;}

/* ===== Footer ===== */
footer.site-footer{border-top:1px solid var(--c-surface-border);background:var(--c-bg-2);padding:56px 0 28px;margin-top:72px;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px;}
.footer-brand p{color:var(--c-text-dim);font-size:0.88rem;margin-top:12px;max-width:34ch;}
.footer-col h3{font-size:0.76rem;letter-spacing:0.08em;text-transform:uppercase;color:var(--c-text-dim);margin-bottom:14px;}
.footer-col ul{list-style:none;display:flex;flex-direction:column;gap:10px;}
.footer-col a{font-size:0.88rem;color:var(--c-text-muted);}
.footer-col a:hover{color:#fff;}
.footer-bottom{
  display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;
  padding-top:24px;border-top:1px solid var(--c-surface-border);
  font-size:0.8rem;color:var(--c-text-dim);
}

@media (max-width:980px){
  .layout,.layout--article{grid-template-columns:1fr;}
  aside.topics,aside.detail-sidebar{position:static;}
  .topic-list{flex-direction:row;flex-wrap:wrap;}
  .grid{grid-template-columns:repeat(2,1fr);}
  nav.primary-nav{display:none;}
  .footer-grid{grid-template-columns:1fr 1fr;}
}
@media (max-width:620px){
  .grid{grid-template-columns:1fr;}
  .wrap{padding:0 18px;}
  .newsletter{flex-direction:column;align-items:flex-start;}
  .newsletter input[type=email]{width:100%;}
  .footer-grid{grid-template-columns:1fr;}
}