:root{
  --navy:#071a33; --navy2:#0b294b; --blue:#0b7db3; --cyan:#22c4e8;
  --ink:#172334; --muted:#607087; --paper:#f7fafc; --white:#fff;
  --line:#dfe7ef; --shadow:0 18px 55px rgba(6,31,56,.10);
  --radius:18px; --max:1180px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;color:var(--ink);background:var(--paper);line-height:1.65}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{width:min(var(--max),calc(100% - 36px));margin:auto}
.site-header{position:sticky;top:0;z-index:50;background:rgba(7,26,51,.94);backdrop-filter:blur(15px);border-bottom:1px solid rgba(255,255,255,.08)}
.nav{height:76px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{display:flex;align-items:center;gap:12px;color:white;font-weight:800;letter-spacing:-.04em}
.brand img{width:46px;height:46px;object-fit:cover;border-radius:10px}
.brand span{font-size:1.25rem}.brand em{font-style:normal;color:#9ba9ba;font-weight:500}
.menu{display:flex;align-items:center;gap:4px}.menu a{color:#dce8f4;padding:10px 12px;border-radius:10px;font-size:.94rem}.menu a:hover,.menu a.active{background:rgba(255,255,255,.09);color:white}
.menu-toggle{display:none;border:0;background:none;color:white;font-size:1.7rem}
.hero{position:relative;overflow:hidden;background:linear-gradient(110deg,rgba(4,20,39,.98),rgba(7,47,76,.91)),url("../assets/serpraxis-hero.jpg") center/cover;min-height:650px;color:white;display:flex;align-items:center}
.hero:after{content:"";position:absolute;inset:0;background:radial-gradient(circle at 72% 40%,rgba(34,196,232,.18),transparent 34%)}
.hero-inner{position:relative;z-index:1;padding:92px 0 100px;max-width:850px}
.kicker{display:inline-flex;gap:8px;align-items:center;color:#75e4fb;text-transform:uppercase;letter-spacing:.15em;font-weight:800;font-size:.75rem}
.hero h1{font-size:clamp(2.5rem,6vw,5rem);line-height:1.02;letter-spacing:-.065em;margin:18px 0}
.hero h1 span{color:#69ddf4}
.hero p{font-size:1.15rem;color:#d3e0eb;max-width:760px}
.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid transparent;border-radius:12px;padding:12px 18px;font-weight:800;cursor:pointer;transition:.2s}
.btn-primary{background:var(--cyan);color:#042037}.btn-primary:hover{transform:translateY(-2px);filter:brightness(1.05)}
.btn-ghost{border-color:rgba(255,255,255,.25);color:white;background:rgba(255,255,255,.05)}.btn-ghost:hover{background:rgba(255,255,255,.1)}
.section{padding:82px 0}.section.alt{background:white}
.section-head{display:flex;justify-content:space-between;gap:30px;align-items:end;margin-bottom:30px}
.section-head h2{margin:0;font-size:clamp(1.8rem,3vw,2.8rem);letter-spacing:-.045em;color:var(--navy)}
.section-head p{margin:8px 0 0;color:var(--muted);max-width:720px}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.card{background:white;border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:0 8px 25px rgba(8,31,55,.04)}
.card h3{margin:8px 0 8px;color:var(--navy);font-size:1.25rem;line-height:1.25}.card p{color:var(--muted);margin:0}
.icon{width:46px;height:46px;display:grid;place-items:center;border-radius:13px;background:#e8f7fb;color:#087ca9;font-size:1.35rem}
.tag{display:inline-block;border-radius:999px;background:#e9f6fb;color:#086b90;padding:5px 10px;font-size:.75rem;font-weight:800}
.article-card{display:flex;flex-direction:column;min-height:230px}.article-card .meta{color:#7b8a9a;font-size:.8rem;margin-top:auto;padding-top:18px}
.split{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center}
.feature{background:linear-gradient(135deg,#071a33,#0b4268);color:white;border-radius:24px;padding:38px;box-shadow:var(--shadow)}
.feature h2{font-size:2rem;line-height:1.15;margin:0 0 12px}.feature p{color:#d0deea}
.feature ul{padding-left:20px;color:#dce9f2}
.statbar{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:30px}.stat{border:1px solid rgba(255,255,255,.12);border-radius:14px;padding:16px}.stat strong{display:block;font-size:1.5rem}.stat span{color:#a9c1d3;font-size:.85rem}
.page-hero{padding:70px 0;background:linear-gradient(120deg,#061a31,#0b4268);color:white}.page-hero h1{font-size:clamp(2.2rem,5vw,3.8rem);letter-spacing:-.055em;margin:0 0 10px}.page-hero p{color:#c9d9e5;max-width:760px}
.searchbar{display:flex;gap:10px;margin:0 0 28px}.searchbar input{flex:1;border:1px solid var(--line);border-radius:12px;padding:13px 15px;font:inherit;background:white}
.course{position:relative;overflow:hidden}.course:before{content:"AI";position:absolute;right:-20px;top:-35px;font-size:9rem;font-weight:900;color:#e9f6fb;z-index:0}.course>*{position:relative;z-index:1}
.cta{padding:48px;border-radius:24px;background:linear-gradient(120deg,#0a3156,#0a789e);color:white}.cta h2{margin-top:0;font-size:2rem}.cta p{color:#d9edf5}
.form-note{font-size:.85rem;color:#728094}
.footer{background:#061528;color:#b6c6d6;padding:48px 0 25px}.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:30px}.footer h3,.footer h4{color:white;margin-top:0}.footer a:hover{color:white}.footer-bottom{border-top:1px solid rgba(255,255,255,.1);margin-top:35px;padding-top:18px;font-size:.8rem;display:flex;justify-content:space-between;gap:20px}
.notice{padding:14px 16px;border-left:4px solid var(--cyan);background:#eefaff;border-radius:10px;color:#31566b}
.breadcrumb{font-size:.85rem;color:#7790a5;margin-bottom:22px}.article{max-width:850px;margin:auto}.article h2{font-size:1.8rem;color:var(--navy);margin-top:42px}.article h3{color:var(--navy)}.article blockquote{border-left:4px solid var(--cyan);margin:25px 0;padding:8px 20px;background:white;color:#4d6175}
.filters{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:24px}.filter{border:1px solid var(--line);background:white;border-radius:999px;padding:8px 13px;cursor:pointer}.filter.active{background:var(--navy);color:white}
@media(max-width:900px){.menu{display:none;position:absolute;top:76px;left:0;right:0;background:#071a33;padding:12px 18px 18px;flex-direction:column;align-items:stretch}.menu.open{display:flex}.menu-toggle{display:block}.grid{grid-template-columns:1fr 1fr}.split,.grid-2{grid-template-columns:1fr}.hero{min-height:590px}.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.container{width:min(var(--max),calc(100% - 24px))}.grid,.statbar,.footer-grid{grid-template-columns:1fr}.section{padding:60px 0}.hero-inner{padding:70px 0}.hero h1{font-size:2.8rem}.footer-bottom{flex-direction:column}.brand span{font-size:1.05rem}}