:root{
  --bg:#f6f8fb;--surface:#fff;--text:#152033;--muted:#657185;--line:#d9e0e8;
  --accent:#2457a6;--accent-soft:#eaf1fb;--max:1120px;
  font-family:Inter,Segoe UI,Arial,sans-serif;color:var(--text);background:var(--bg)
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);line-height:1.55}a{color:var(--accent)}
.wrap{width:min(var(--max),calc(100% - 40px));margin-inline:auto}
.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:10}.header-row{min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{text-decoration:none;font-size:1.35rem;font-weight:750;color:var(--text);letter-spacing:-.02em}.brand span{color:var(--accent)}nav{display:flex;gap:20px;flex-wrap:wrap}nav a{text-decoration:none;color:var(--muted);font-weight:600;font-size:.95rem}nav a:hover,nav a.active{color:var(--accent)}
.hero{padding:76px 0 52px}.eyebrow{font-size:.76rem;letter-spacing:.12em;font-weight:800;color:var(--accent);margin:0 0 12px}.hero h1,.course-page h1,.not-found h1{font-size:clamp(2.2rem,5vw,4.4rem);line-height:1.04;letter-spacing:-.04em;margin:.15em 0 .35em;max-width:900px}.lead{font-size:1.14rem;color:var(--muted);max-width:780px}.lead.compact{max-width:720px}
.section{padding:42px 0}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:30px;border-bottom:1px solid var(--line);padding-bottom:18px;margin-bottom:24px}.section-heading h2,.chapter-section h2{font-size:2rem;margin:0}.section-heading>p{max-width:520px;margin:0;color:var(--muted)}
.course-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.course-card,.future-card{background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:26px}.course-meta{display:flex;justify-content:space-between;gap:14px;align-items:center;color:var(--accent);font-weight:800;font-size:.82rem}.status{display:inline-block;background:var(--accent-soft);color:var(--accent);border-radius:999px;padding:5px 10px;font-size:.78rem;font-weight:800}.course-card h3,.future-card h3{font-size:1.45rem;margin:18px 0 8px}.course-card p,.future-card p{color:var(--muted)}.chapter-count{font-size:.88rem}.button{display:inline-block;text-decoration:none;background:var(--accent);color:#fff;border-radius:6px;padding:10px 15px;font-weight:750;margin-top:6px}.button:hover{filter:brightness(.95)}
.future-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.future-card{min-height:185px}.future-card .eyebrow{margin-bottom:6px}.future-card h3{margin-top:0}
.site-footer{margin-top:48px;border-top:1px solid var(--line);background:#fff;color:var(--muted);padding:22px 0;font-size:.9rem}
.course-page{padding:54px 0 20px;min-height:70vh}.back-link{text-decoration:none;color:var(--muted);display:inline-block;margin-bottom:38px}.status-line{margin:20px 0 40px}.chapter-section{border-top:1px solid var(--line);padding-top:30px}.chapter-list{margin-top:20px;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:#fff}.chapter-row{display:grid;grid-template-columns:130px 1fr 24px;align-items:center;gap:16px;padding:18px 20px;text-decoration:none;color:var(--text);border-bottom:1px solid var(--line)}.chapter-row:last-child{border-bottom:0}.chapter-row:hover{background:#f9fbfe}.chapter-label{font-size:.8rem;font-weight:800;color:var(--accent)}.chapter-title{font-weight:650}.chapter-arrow{color:var(--accent);font-size:1.2rem}.not-found{padding:100px 0}.error{color:#9b1c1c}
@media(max-width:760px){.header-row,.section-heading{align-items:flex-start;flex-direction:column;padding-block:15px}.site-header{position:static}.course-grid,.future-grid{grid-template-columns:1fr}.hero{padding-top:48px}.chapter-row{grid-template-columns:1fr 24px}.chapter-label{grid-column:1}.chapter-title{grid-column:1}.chapter-arrow{grid-column:2;grid-row:1/3}.wrap{width:min(var(--max),calc(100% - 28px))}}