:root{--hd:#0f1626;--acc:#2563eb;--acc2:#f59e0b;--ink:#17202e;--mut:#5b6779;--bg:#f6f8fb;--card:#fff;--line:#e5eaf1}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,'Segoe UI',Roboto,Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.65;font-size:16px}
img{max-width:100%;display:block}a{color:var(--acc);text-decoration:none}a:hover{text-decoration:underline}
.container{max-width:1180px;margin:0 auto;padding:0 20px}
.sr-only{position:absolute;left:-9999px}
.skip-link{position:absolute;left:-9999px;top:0;background:var(--acc);color:#fff;padding:8px 14px;z-index:99}
.skip-link:focus{left:8px;top:8px}
:focus-visible{outline:3px solid var(--acc2);outline-offset:2px}
h1,h2,h3,h4{line-height:1.25}
.site-header{background:var(--hd);position:sticky;top:0;z-index:50;box-shadow:0 2px 10px rgba(0,0,0,.18)}
.header-inner{display:flex;align-items:center;gap:18px;padding:12px 20px;flex-wrap:wrap}
.logo{color:#fff;font-size:1.35rem;font-weight:800}
.logo-accent,.logo-bolt{color:var(--acc2)}
.main-nav{display:flex;gap:16px;flex-wrap:wrap}
.main-nav a{color:#c9d4e6;font-size:.92rem;font-weight:500}
.main-nav a:hover{color:#fff;text-decoration:none}
.nav-toggle{display:none;background:none;border:1px solid #33405a;color:#fff;border-radius:8px;padding:6px 12px;font-size:1.1rem;cursor:pointer}
.header-search{display:flex;margin-left:auto}
.header-search input{padding:8px 12px;border:1px solid #33405a;border-radius:8px 0 0 8px;background:#1c2740;color:#fff;width:200px}
.header-search button{padding:8px 14px;border:none;background:var(--acc);color:#fff;border-radius:0 8px 8px 0;cursor:pointer}
@media(max-width:900px){.nav-toggle{display:block}.main-nav{display:none;width:100%;flex-direction:column;padding:10px 0}.main-nav.open{display:flex}.header-search{margin-left:0;width:100%}.header-search input{flex:1;width:auto}}
.layout{display:grid;grid-template-columns:1fr 320px;gap:28px;padding:26px 0 50px}
@media(max-width:960px){.layout{grid-template-columns:1fr}.sidebar{display:none}}
.section-title{font-size:1.4rem;margin:26px 0 14px;padding-left:12px;border-left:4px solid var(--acc)}
.section-title a{color:var(--ink)}
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:20px}
.card{background:var(--card);border:1px solid var(--line);border-radius:12px;overflow:hidden;box-shadow:0 1px 3px rgba(16,24,40,.06);display:flex;flex-direction:column}
.card-img img{width:100%;height:150px;object-fit:cover;background:#0f1626}
.card-body{padding:14px 16px 16px;display:flex;flex-direction:column;gap:8px;flex:1}
.card-cat{font-size:.72rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--acc2)}
.card-title{font-size:1.02rem}.card-title a{color:var(--ink)}
.card-excerpt{font-size:.88rem;color:var(--mut);flex:1}
.card-meta{font-size:.78rem;color:var(--mut)}
.featured-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:20px}
@media(max-width:900px){.featured-grid{grid-template-columns:1fr}}
.featured-big{position:relative;border-radius:14px;overflow:hidden;min-height:340px;display:flex;align-items:flex-end}
.featured-big img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.featured-big .fb-body{position:relative;background:linear-gradient(transparent,rgba(8,12,22,.92));color:#fff;padding:22px;width:100%}
.featured-big .fb-body h2{font-size:1.45rem}.featured-big .fb-body a{color:#fff}
.breadcrumb{font-size:.82rem;color:var(--mut);margin-bottom:14px}
.breadcrumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px}
.breadcrumb li+li::before{content:"›";margin-right:6px;color:#aab4c4}
.article-head h1{font-size:2.05rem;margin:8px 0 10px}
.article-meta{color:var(--mut);font-size:.88rem;margin-bottom:18px;display:flex;gap:14px;flex-wrap:wrap}
.article-hero{border-radius:14px;overflow:hidden;margin-bottom:22px}
.article-hero img{width:100%;max-height:440px;object-fit:cover}
.article-body{font-size:1.03rem;max-width:760px}
.article-body h2{font-size:1.45rem;margin:30px 0 12px}
.article-body h3{font-size:1.15rem;margin:22px 0 10px}
.article-body p{margin-bottom:16px}
.article-body ul,.article-body ol{margin:0 0 16px 24px}
.article-body li{margin-bottom:8px}
.article-body pre{background:#0f1626;color:#dbe4f5;padding:14px;border-radius:10px;overflow-x:auto;font-size:.85rem;margin-bottom:16px}
.article-body code{background:#eef2f8;padding:2px 6px;border-radius:5px;font-size:.9em}
.article-body blockquote{border-left:4px solid var(--acc2);background:#fffaf0;padding:12px 16px;border-radius:0 10px 10px 0;margin-bottom:16px}
.article-tags{margin:26px 0;display:flex;gap:8px;flex-wrap:wrap}
.article-tags a{background:#eef2f8;padding:4px 12px;border-radius:999px;font-size:.82rem}
.faq-box{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px 20px;margin:26px 0}
.faq-box h2{margin-bottom:12px;font-size:1.25rem}
.faq-box details{border-top:1px solid var(--line);padding:10px 0}
.faq-box summary{cursor:pointer;font-weight:600}
.faq-box details p{margin-top:8px;color:var(--mut)}
.share-row{display:flex;gap:10px;align-items:center;margin:24px 0;flex-wrap:wrap}
.share-row a{background:var(--hd);color:#fff;padding:7px 14px;border-radius:999px;font-size:.85rem}
.prev-next{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:26px 0}
.prev-next a{background:var(--card);border:1px solid var(--line);padding:14px 16px;border-radius:10px;color:var(--ink)}
.prev-next .pn-label{font-size:.72rem;text-transform:uppercase;color:var(--mut);letter-spacing:.06em}
.pagination ul{list-style:none;display:flex;gap:8px;margin:26px 0;flex-wrap:wrap}
.pagination a{display:block;padding:8px 14px;background:var(--card);border:1px solid var(--line);border-radius:8px;color:var(--acc)}
.pagination a.on{background:var(--acc);color:#fff;border-color:var(--acc)}
.widget{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:18px;margin-bottom:20px}
.widget h2{font-size:.82rem;margin-bottom:12px;text-transform:uppercase;letter-spacing:.05em;color:var(--mut)}
.widget-list{list-style:none}.widget-list li{margin-bottom:10px;font-size:.92rem}
.widget-list.two-col{columns:2}
.newsletter-form{display:flex}
.newsletter-form input{flex:1;padding:9px 12px;border:1px solid var(--line);border-radius:8px 0 0 8px}
.newsletter-form button{padding:9px 14px;border:none;background:var(--acc);color:#fff;border-radius:0 8px 8px 0;cursor:pointer}
.page-title{font-size:2rem;margin:22px 0 8px}
.page-lede{color:var(--mut);margin-bottom:24px;max-width:720px}
.prose{max-width:760px;font-size:1.02rem}
.prose p{margin-bottom:16px}.prose h2{margin:26px 0 12px;font-size:1.35rem}
.prose ul{margin:0 0 16px 24px}
.form-card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:24px;max-width:620px}
.form-card label{display:block;font-weight:600;font-size:.9rem;margin:14px 0 5px}
.form-card input,.form-card textarea,.form-card select{width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:8px;font:inherit}
.form-card button{margin-top:16px;background:var(--acc);color:#fff;border:none;border-radius:8px;padding:11px 20px;cursor:pointer;font-size:1rem}
.form-ok{color:#15803d;font-weight:600;margin-top:10px}
.form-err{color:#b91c1c;font-weight:600;margin-top:10px}
.hp-field{position:absolute;left:-9999px;opacity:0}
.site-footer{background:var(--hd);color:#9aa7bd;margin-top:40px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:26px;padding:40px 20px 24px}
@media(max-width:800px){.footer-grid{grid-template-columns:1fr 1fr}}
.footer-logo{color:#fff;font-weight:800;font-size:1.2rem}
.footer-logo span{color:var(--acc2)}
.footer-desc{font-size:.86rem;margin-top:8px;max-width:300px}
.site-footer h2{font-size:.78rem;text-transform:uppercase;letter-spacing:.08em;color:#7c8aa3;margin-bottom:12px}
.site-footer nav a{display:block;color:#b8c4d9;font-size:.88rem;margin-bottom:8px}
.footer-bottom{border-top:1px solid #1f2b44;padding:16px 20px;font-size:.82rem;text-align:center;color:#7c8aa3}

/* dark mode */
body.dark,.dark-start body{--ink:#d7dfea;--mut:#8894a8;--bg:#0f141c;--card:#1a2230;--line:#26314a}
body.dark,.dark-start body{background:#0f141c;color:#d7dfea}
body.dark .article-body code,body.dark .article-tags a{background:#22304d;color:#d7dfea}
#dmToggle{background:none;border:1px solid #33405a;color:#cfd6e4;border-radius:8px;padding:5px 11px;cursor:pointer;font-size:.95rem}