:root {
    --blue:#2563EB; --blue-dark:#1D4ED8; --blue-light:#DBEAFE;
    --blue-bright:#60A5FA; --indigo:#818CF8;
    --black:#0F172A; --hero-bg:#030711;
    --gray-500:#64748B; --gray-200:#E2E8F0; --gray-50:#F8FAFC; --white:#FFFFFF;
    --ease:cubic-bezier(0.16,1,0.3,1);
}
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Inter',sans-serif;background:var(--white);color:var(--black);overflow-x:hidden}

/* nav */
nav{position:fixed;top:0;left:0;right:0;z-index:500;height:68px;display:flex;align-items:center;justify-content:space-between;padding:0 clamp(20px,5vw,80px);background:rgba(255,255,255,.88);backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px);border-bottom:1px solid rgba(0,0,0,.06);box-shadow:0 4px 32px rgba(0,0,0,.07)}
.logo{display:flex;align-items:center;text-decoration:none}
.logo img{height:32px;width:auto;display:block}
.nav-links{display:flex;align-items:center;gap:28px}
.nav-link{font-size:14px;font-weight:600;color:var(--gray-500);text-decoration:none;transition:color .25s}
.nav-link:hover,.nav-link.active{color:var(--blue)}
.nav-btn{display:inline-flex;align-items:center;gap:8px;padding:10px 22px;background:var(--blue);color:#fff;font-size:14px;font-weight:700;border-radius:100px;text-decoration:none;transition:background .3s var(--ease),transform .3s var(--ease),box-shadow .3s var(--ease)}
.nav-btn:hover{background:var(--blue-dark);transform:translateY(-1px);box-shadow:0 8px 30px rgba(37,99,235,.4)}

/* blog hero */
.blog-hero{padding:150px clamp(20px,5vw,80px) 60px;background:var(--hero-bg);color:#fff}
.blog-hero .label-tag{color:var(--blue-bright)}
.blog-hero .label-tag::before{background:var(--blue-bright)}
.blog-hero h1{font-size:clamp(38px,6vw,72px);font-weight:900;letter-spacing:-2.5px;line-height:1.02;margin-bottom:20px}
.blog-hero h1 .accent{background:linear-gradient(90deg,var(--blue-bright),var(--indigo));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.blog-hero p{font-size:clamp(15px,1.8vw,18px);color:rgba(255,255,255,.55);line-height:1.65;max-width:560px}

.label-tag{display:inline-flex;align-items:center;gap:10px;font-size:11px;font-weight:700;letter-spacing:2px;text-transform:uppercase;color:var(--blue);margin-bottom:18px}
.label-tag::before{content:'';width:24px;height:2px;background:var(--blue)}

/* listing */
.post-section{padding:70px clamp(20px,5vw,80px) 40px}
.post-section h2{font-size:clamp(24px,3vw,32px);font-weight:900;letter-spacing:-1px;margin-bottom:32px}
.post-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:24px}
.post-card{display:flex;flex-direction:column;padding:36px 32px;border:1.5px solid var(--gray-200);border-radius:22px;text-decoration:none;color:var(--black);position:relative;overflow:hidden;transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease)}
.post-card::before{content:'';position:absolute;inset:0;background:linear-gradient(135deg,rgba(37,99,235,.05) 0%,transparent 60%);opacity:0;transition:opacity .3s}
.post-card:hover{transform:translateY(-6px);box-shadow:0 24px 60px rgba(0,0,0,.09);border-color:var(--blue)}
.post-card:hover::before{opacity:1}
.post-tag{display:inline-block;align-self:flex-start;font-size:11px;font-weight:700;letter-spacing:1.5px;text-transform:uppercase;color:var(--blue);background:var(--blue-light);padding:5px 12px;border-radius:100px;margin-bottom:18px}
.post-title{font-size:21px;font-weight:800;letter-spacing:-.5px;line-height:1.25;margin-bottom:12px}
.post-excerpt{font-size:14.5px;color:var(--gray-500);line-height:1.65;flex:1;margin-bottom:24px}
.post-meta{font-size:13px;font-weight:600;color:var(--blue);display:inline-flex;align-items:center;gap:8px}

/* article */
.article-head{padding:150px clamp(20px,5vw,80px) 48px;max-width:840px;margin:0 auto}
.breadcrumb{font-size:13px;font-weight:600;color:var(--gray-500);margin-bottom:26px}
.breadcrumb a{color:var(--blue);text-decoration:none}
.article-head h1{font-size:clamp(32px,4.6vw,52px);font-weight:900;letter-spacing:-1.8px;line-height:1.06;margin-bottom:20px}
.article-info{display:flex;flex-wrap:wrap;gap:16px;font-size:13.5px;color:var(--gray-500);font-weight:500}
.article-info strong{color:var(--black)}

.article-body{max-width:840px;margin:0 auto;padding:0 clamp(20px,5vw,80px) 60px}
.article-body p{font-size:17px;line-height:1.8;color:#334155;margin-bottom:22px}
.article-body h2{font-size:clamp(23px,2.8vw,30px);font-weight:900;letter-spacing:-.8px;line-height:1.2;margin:48px 0 18px}
.article-body h3{font-size:19px;font-weight:800;letter-spacing:-.4px;margin:34px 0 14px}
.article-body ul,.article-body ol{margin:0 0 22px 22px}
.article-body li{font-size:17px;line-height:1.8;color:#334155;margin-bottom:10px}
.article-body a{color:var(--blue);font-weight:600;text-decoration:none;border-bottom:1.5px solid var(--blue-light);transition:border-color .25s}
.article-body a:hover{border-color:var(--blue)}
.article-body strong{color:var(--black)}

.highlight-box{background:var(--gray-50);border:1.5px solid var(--gray-200);border-left:4px solid var(--blue);border-radius:14px;padding:24px 28px;margin:28px 0}
.highlight-box p,.highlight-box li{margin-bottom:0;font-size:16px}
.highlight-box p+p{margin-top:12px}
.highlight-box .hl-title{font-size:12px;font-weight:800;letter-spacing:1.5px;text-transform:uppercase;color:var(--blue);margin-bottom:10px}

.warn-box{background:#FEF2F2;border:1.5px solid #FECACA;border-left:4px solid #DC2626;border-radius:14px;padding:24px 28px;margin:28px 0}
.warn-box .hl-title{font-size:12px;font-weight:800;letter-spacing:1.5px;text-transform:uppercase;color:#DC2626;margin-bottom:10px}
.warn-box p,.warn-box li{margin-bottom:0;font-size:16px}

.comparison-table{width:100%;border-collapse:collapse;margin:28px 0;font-size:15.5px}
.comparison-table th{background:var(--black);color:#fff;font-weight:700;text-align:left;padding:14px 18px}
.comparison-table th:first-child{border-radius:12px 0 0 0}
.comparison-table th:last-child{border-radius:0 12px 0 0}
.comparison-table td{padding:14px 18px;border-bottom:1.5px solid var(--gray-200);color:#334155;line-height:1.5}
.comparison-table tr:nth-child(even) td{background:var(--gray-50)}
.table-wrap{overflow-x:auto}

/* article CTA */
.article-cta{background:var(--black);border-radius:24px;padding:48px clamp(28px,5vw,56px);margin:52px 0;position:relative;overflow:hidden}
.article-cta::before{content:'';position:absolute;border-radius:50%;width:420px;height:420px;background:radial-gradient(circle,rgba(37,99,235,.3) 0%,transparent 65%);top:-180px;right:-60px;pointer-events:none}
.article-cta h3{position:relative;font-size:clamp(22px,3vw,30px);font-weight:900;letter-spacing:-1px;line-height:1.15;color:#fff;margin:0 0 12px}
.article-cta h3 .grad{background:linear-gradient(90deg,#60A5FA,#818CF8);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.article-cta p{position:relative;font-size:15.5px;color:rgba(255,255,255,.6);line-height:1.6;margin-bottom:28px;max-width:440px}
.btn-light{position:relative;display:inline-flex;align-items:center;gap:10px;padding:15px 30px;background:#fff;color:var(--black);font-size:15px;font-weight:700;border-radius:100px;text-decoration:none;transition:background .3s var(--ease),color .3s,transform .3s var(--ease),box-shadow .3s var(--ease)}
.btn-light:hover{background:var(--blue);color:#fff;transform:translateY(-3px);box-shadow:0 16px 48px rgba(37,99,235,.4)}

/* related */
.related{max-width:840px;margin:0 auto;padding:0 clamp(20px,5vw,80px) 90px}
.related h2{font-size:22px;font-weight:900;letter-spacing:-.6px;margin-bottom:22px}
.related-links{display:grid;gap:12px}
.related-links a{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 24px;border:1.5px solid var(--gray-200);border-radius:14px;text-decoration:none;color:var(--black);font-size:15.5px;font-weight:700;letter-spacing:-.2px;transition:border-color .3s,transform .3s var(--ease),box-shadow .3s var(--ease)}
.related-links a:hover{border-color:var(--blue);transform:translateY(-2px);box-shadow:0 12px 32px rgba(0,0,0,.07)}
.related-links a span{color:var(--blue);flex-shrink:0}

footer{padding:40px clamp(20px,5vw,80px);display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;border-top:1px solid var(--gray-200)}
.footer-logo img{height:34px;width:auto;display:block}
.footer-copy{font-size:13px;color:var(--gray-500)}

@media(max-width:640px){
    .nav-links{gap:16px}
    .nav-link{display:none}
    .article-body p,.article-body li{font-size:16px}
}