:root{
  --accent:#2563eb;--accent-dark:#1d4ed8;--ink:#0f172a;--text:#2b2f3a;--muted:#6b7280;
  --line:#e5e7eb;--bg:#f4f6fb;--card:#ffffff;--navy:#0f172a;--radius:14px;
  --shadow:0 1px 2px rgba(15,23,42,.06),0 8px 24px rgba(15,23,42,.06);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font:17px/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
h1,h2,h3,h4{color:var(--ink);line-height:1.25;margin:0}
ul,ol{padding-left:1.3em}
:focus-visible{outline:3px solid #93c5fd;outline-offset:2px;border-radius:4px}
.wrap{max-width:1180px;margin:0 auto;padding:0 20px}
.sr-only{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* progress + back to top */
#progress{position:fixed;top:0;left:0;height:4px;width:0;background:var(--accent);z-index:200;transition:width .1s}
#to-top{position:fixed;right:22px;bottom:22px;width:46px;height:46px;border:0;border-radius:50%;background:var(--accent);color:#fff;font-size:22px;cursor:pointer;box-shadow:var(--shadow);opacity:0;pointer-events:none;transition:opacity .2s;z-index:90}
#to-top.show{opacity:1;pointer-events:auto}

/* top bar */
.topbar{background:var(--navy);color:#cbd5e1;font-size:13.5px}
.topbar .wrap{display:flex;justify-content:space-between;gap:16px;padding-top:8px;padding-bottom:8px}
.topbar a{color:#cbd5e1;margin-left:16px}
.topbar a:hover{color:#fff;text-decoration:none}

/* header */
.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:100}
.header-inner{display:flex;align-items:center;gap:20px;min-height:72px}
.logo{display:flex;align-items:center;gap:10px;color:var(--ink);font-weight:800;font-size:22px;letter-spacing:-.02em}
.logo:hover{text-decoration:none}
.logo-mark{display:grid;place-items:center;width:38px;height:38px;border-radius:10px;background:linear-gradient(135deg,var(--accent),#7c3aed);color:#fff;font-size:20px}
.main-nav{margin-left:auto}
.main-nav ul{list-style:none;display:flex;flex-wrap:nowrap;gap:0;margin:0;padding:0}
.main-nav a{display:block;padding:8px 10px;color:var(--ink);font-size:14px;font-weight:600;border-radius:8px;white-space:nowrap}
.main-nav a:hover,.main-nav a.active{background:#eef2ff;color:var(--accent);text-decoration:none}
.header-search{display:flex;align-items:center;border:1px solid var(--line);border-radius:999px;background:#f8fafc;padding:2px 4px 2px 14px}
.header-search input{border:0;background:transparent;font:inherit;font-size:14px;width:100px;outline:0;color:var(--ink)}
.header-search button{border:0;background:var(--accent);color:#fff;width:32px;height:32px;border-radius:50%;cursor:pointer;display:grid;place-items:center}
.nav-toggle{display:none;margin-left:auto;border:1px solid var(--line);background:#fff;border-radius:10px;width:44px;height:44px;font-size:22px;cursor:pointer;color:var(--ink)}

/* hero */
.hero{display:grid;grid-template-columns:2fr 1fr;gap:20px;margin-top:28px}
.hero-side{display:grid;grid-template-rows:1fr 1fr;gap:20px}
.hero-item{position:relative;border-radius:var(--radius);overflow:hidden;background:var(--navy);min-height:210px;box-shadow:var(--shadow)}
.hero-item.main{min-height:440px}
.hero-item img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .4s}
.hero-item:hover img{transform:scale(1.04)}
.hero-overlay{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:flex-end;gap:8px;padding:22px;background:linear-gradient(to top,rgba(15,23,42,.88),rgba(15,23,42,.1) 70%);color:#fff}
.hero-overlay h2,.hero-overlay h3{color:#fff;font-size:1.05rem}
.hero-item.main .hero-overlay h2{font-size:2rem;max-width:30ch}
.hero-overlay a{color:#fff}
.hero-overlay .meta{font-size:13.5px;color:#e2e8f0}
.hero-link{position:absolute;inset:0;z-index:1}
.hero-overlay .cat-badge{position:relative;z-index:2}

.cat-badge{display:inline-block;align-self:flex-start;padding:3px 12px;border-radius:999px;font-size:12px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:#fff!important;line-height:1.7}
.cat-badge:hover{text-decoration:none;filter:brightness(1.1)}

/* topic chips */
.topics{display:flex;flex-wrap:wrap;gap:10px;margin:28px 0 4px}
.topics a{background:#fff;border:1px solid var(--line);border-radius:999px;padding:6px 16px;font-size:14.5px;font-weight:600;color:var(--ink)}
.topics a:hover{border-color:var(--accent);color:var(--accent);text-decoration:none}

/* layout */
.page-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:32px;margin-top:32px;margin-bottom:56px;align-items:start}
.section-title{font-size:1.5rem;margin-bottom:20px;padding-bottom:10px;border-bottom:3px solid var(--line);position:relative}
.section-title::after{content:"";position:absolute;left:0;bottom:-3px;width:72px;height:3px;background:var(--accent)}

/* cards */
.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.grid.three{grid-template-columns:repeat(3,minmax(0,1fr))}
.card{background:var(--card);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);display:flex;flex-direction:column;transition:transform .2s}
.card:hover{transform:translateY(-3px)}
.card-img{display:block;aspect-ratio:16/9;overflow:hidden;background:#e2e8f0}
.card-img img{width:100%;height:100%;object-fit:cover}
.card-body{padding:18px 20px 22px;display:flex;flex-direction:column;gap:8px;flex:1}
.card-title{font-size:1.15rem}
.card-title a{color:var(--ink)}
.card-title a:hover{color:var(--accent);text-decoration:none}
.card-meta{margin:0;font-size:13.5px;color:var(--muted)}
.card-excerpt{margin:0;font-size:15.5px;color:#4b5563;flex:1}
.read-more{font-weight:700;font-size:14.5px}

/* sidebar */
.sidebar{position:sticky;top:92px}
.widget{background:#fff;border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);margin-bottom:24px}
.widget h4{font-size:1.05rem;margin-bottom:14px;padding-bottom:10px;border-bottom:2px solid var(--line);position:relative}
.widget h4::after{content:"";position:absolute;left:0;bottom:-2px;width:48px;height:2px;background:var(--accent)}
.widget p{margin:0 0 10px;font-size:15.5px}
.widget ul{list-style:none;padding:0;margin:0}
.widget .search-form{display:flex;gap:8px}
.widget .search-form input{flex:1;min-width:0;padding:10px 14px;border:1px solid var(--line);border-radius:10px;font:inherit;font-size:15px}
.widget .search-form button,.btn{background:var(--accent);color:#fff;border:0;border-radius:10px;padding:10px 16px;font:inherit;font-size:15px;font-weight:700;cursor:pointer}
.widget .search-form button:hover,.btn:hover{background:var(--accent-dark);text-decoration:none}
.about-widget{text-align:center}
.about-widget h4::after{display:none}
.avatar{display:grid;place-items:center;width:72px;height:72px;border-radius:50%;background:linear-gradient(135deg,var(--accent),#7c3aed);color:#fff;font-size:30px;font-weight:800;margin:0 auto 12px}
.recent li{display:flex;gap:12px;padding:10px 0;border-bottom:1px solid var(--line)}
.recent li:last-child{border-bottom:0;padding-bottom:0}
.recent img{width:72px;height:72px;object-fit:cover;border-radius:10px;flex:none}
.recent a{color:var(--ink);font-weight:600;font-size:15px;line-height:1.35}
.recent small{display:block;color:var(--muted);font-size:12.5px;margin-top:4px}
.cat-list li{display:flex;justify-content:space-between;padding:9px 0;border-bottom:1px dashed var(--line);font-size:15.5px}
.cat-list li:last-child{border-bottom:0}
.cat-list span{color:var(--muted);font-size:13.5px;background:#f1f5f9;border-radius:999px;padding:0 10px}
.notice{background:#fff7ed;border:1px solid #fed7aa;color:#7c2d12}
.notice h4{border-color:#fed7aa}

/* single post */
.breadcrumb{font-size:14px;color:var(--muted);margin-bottom:14px}
.breadcrumb a{color:var(--muted)}
.breadcrumb a:hover{color:var(--accent)}
.post{background:#fff;border-radius:var(--radius);padding:38px 40px;box-shadow:var(--shadow)}
.post-header{display:flex;flex-direction:column;gap:14px;margin-bottom:22px}
.post-header h1{font-size:2.15rem;letter-spacing:-.02em}
.post-meta{display:flex;flex-wrap:wrap;gap:6px 16px;align-items:center;font-size:14.5px;color:var(--muted)}
.post-meta strong{color:var(--ink)}
.post-meta .dot-avatar{display:grid;place-items:center;width:30px;height:30px;border-radius:50%;background:var(--accent);color:#fff;font-weight:800;font-size:14px}
.post-image{margin:0 0 26px;border-radius:12px;overflow:hidden;aspect-ratio:16/9;background:#e2e8f0}
.post-image img{width:100%;height:100%;object-fit:cover}
.toc{border:1px solid var(--line);border-left:5px solid var(--accent);background:#f8fafc;border-radius:10px;padding:16px 22px;margin:0 0 28px}
.toc-head{display:flex;justify-content:space-between;align-items:center;gap:12px}
.toc-head strong{color:var(--ink);font-size:1.05rem}
.toc-toggle{border:0;background:transparent;color:var(--accent);font:inherit;font-size:14px;font-weight:700;cursor:pointer}
.toc ul{list-style:none;margin:12px 0 0;padding:0;font-size:15.5px}
.toc li{margin:5px 0}
.toc.closed ul{display:none}
.entry{font-size:18px}
.entry h2{font-size:1.6rem;margin:2em 0 .6em;padding-top:.2em;scroll-margin-top:96px}
.entry p{margin:0 0 1.15em}
.entry ul,.entry ol{margin:0 0 1.3em}
.entry li{margin:.45em 0}
.entry a{text-decoration:underline}
.share{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:36px 0 0;padding-top:22px;border-top:1px solid var(--line)}
.share strong{color:var(--ink);margin-right:4px}
.share a,.share button{border:0;border-radius:999px;padding:7px 16px;font:inherit;font-size:14px;font-weight:700;color:#fff;cursor:pointer}
.share a:hover,.share button:hover{filter:brightness(1.1);text-decoration:none}
.sh-fb{background:#1877f2}.sh-x{background:#111827}.sh-wa{background:#25d366}.sh-in{background:#0a66c2}.sh-copy{background:#64748b}
.author-box{display:flex;gap:18px;align-items:center;margin-top:28px;padding:22px;border-radius:12px;background:#f8fafc;border:1px solid var(--line)}
.author-box .avatar{margin:0;flex:none}
.author-box h4{font-size:1.05rem;margin-bottom:4px}
.author-box p{margin:0;font-size:15.5px}
.post-nav{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:24px}
.post-nav a{display:block;padding:16px 18px;border:1px solid var(--line);border-radius:12px;color:var(--ink);font-weight:700;line-height:1.35}
.post-nav a:hover{border-color:var(--accent);text-decoration:none}
.post-nav small{display:block;color:var(--muted);font-weight:600;font-size:12.5px;text-transform:uppercase;letter-spacing:.05em;margin-bottom:4px}
.post-nav .next{text-align:right}
.related{margin-top:36px}

/* plain pages */
.page-card{background:#fff;border-radius:var(--radius);padding:38px 40px;box-shadow:var(--shadow)}
.page-card h1{font-size:2rem;margin-bottom:16px}
.page-card h2{font-size:1.4rem;margin:1.6em 0 .5em}
.page-card p,.page-card li{font-size:17.5px}
.archive-head{margin-bottom:22px}
.archive-head h1{font-size:1.9rem}
.archive-head p{margin:6px 0 0;color:var(--muted)}
.empty{background:#fff;border-radius:var(--radius);padding:28px;box-shadow:var(--shadow)}

/* footer */
.site-footer{background:var(--navy);color:#cbd5e1;margin-top:20px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:36px;padding-top:48px;padding-bottom:36px}
.site-footer h4{color:#fff;font-size:1.05rem;margin-bottom:14px}
.site-footer p{margin:0;font-size:15.5px}
.site-footer ul{list-style:none;margin:0;padding:0}
.site-footer li{margin:7px 0}
.site-footer a{color:#cbd5e1}
.site-footer a:hover{color:#fff}
.footer-bottom{border-top:1px solid #1e293b;font-size:14px;padding:16px 0;color:#94a3b8}

/* responsive */
@media (max-width:1100px){
  .nav-toggle{display:block}
  .header-inner{flex-wrap:wrap;padding-top:12px;padding-bottom:12px}
  .main-nav{display:none;width:100%;order:3;margin-left:0}
  .main-nav.open{display:block}
  .main-nav ul{flex-direction:column}
  .main-nav a{white-space:normal}
  .header-search{display:none}
  .page-layout{grid-template-columns:1fr}
  .sidebar{position:static}
  .grid.three{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:820px){
  .hero{grid-template-columns:1fr}
  .hero-item.main{min-height:340px}
  .hero-item.main .hero-overlay h2{font-size:1.5rem}
  .hero-side{grid-template-rows:none;grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:1fr}
}
@media (max-width:640px){
  body{font-size:16.5px}
  .grid,.grid.three{grid-template-columns:1fr}
  .hero-side{grid-template-columns:1fr}
  .post,.page-card{padding:24px 20px}
  .post-header h1{font-size:1.65rem}
  .entry{font-size:17px}
  .post-nav{grid-template-columns:1fr}
  .post-nav .next{text-align:left}
  .topbar .wrap>span:last-child{display:none}
  .author-box{flex-direction:column;text-align:center}
}