:root{
  --brand:#0f3d66;
  --accent:#1f8dce;
  --ink:#101418;
  --muted:#5c6b77;
  --bg:#f7f9fb;
  --card:#ffffff;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Apple Color Emoji,Segoe UI Emoji,Arial,sans-serif;color:var(--ink);background:var(--bg)}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:1080px;margin:0 auto;padding:24px}
header{background:var(--brand);color:#fff;position:sticky;top:0;z-index:50}
.header-inner{display:flex;gap:24px;align-items:center;justify-content:space-between;padding:16px 24px}
nav a{color:#eaf4ff;margin:0 10px;font-weight:600}
nav a.active, nav a:hover{color:#fff;text-decoration:underline}
.hero{background:linear-gradient(180deg,#0f3d66 0%,#19527f 100%);color:#fff;padding:64px 24px}
.hero h1{margin:0 0 12px 0;font-size:40px;line-height:1.1}
.hero p{margin:0;color:#d7e7f7;max-width:800px}
.grid{display:grid;gap:16px}
.grid.cols-3{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.card{background:var(--card);border-radius:16px;box-shadow:0 6px 18px rgba(16,20,24,.06);padding:18px}
.card h3{margin:0 0 8px}
.btn{display:inline-block;background:var(--accent);color:#fff;padding:12px 18px;border-radius:10px;font-weight:700;box-shadow:0 4px 12px rgba(31,141,206,.25)}
.btn.secondary{background:#e9f5ff;color:#0f3d66}
.btn:hover{filter:brightness(.95)}
footer{background:#0e263d;color:#b7c6d6;margin-top:48px}
footer .container{padding:28px}
.section{padding:32px 24px}
.badge{display:inline-block;background:#e9f5ff;color:#0f3d66;padding:6px 10px;border-radius:999px;font-weight:700;font-size:13px}
.tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:12px}
.tab{padding:10px 12px;border-radius:10px;border:1px solid #d8e6f2;background:#fff;cursor:pointer;font-weight:700}
.tab.active{background:var(--accent);color:#fff;border-color:transparent}
.list{display:none}
.list.active{display:block}
.figure{display:flex;gap:16px;align-items:center}
.figure img{width:100%;max-width:240px;border-radius:12px;box-shadow:0 6px 18px rgba(0,0,0,.1)}
.tag{font-size:12px;color:var(--muted)}
hr{border:0;border-top:1px solid #e5edf5;margin:24px 0}
.downloads{display:flex;gap:12px;flex-wrap:wrap}
.responsive-yt{position:relative;padding-bottom:56.25%;height:0;overflow:hidden;border-radius:16px;box-shadow:0 6px 18px rgba(0,0,0,.2)}
.responsive-yt iframe{position:absolute;top:0;left:0;width:100%;height:100%;border:0}
.kv{display:flex;gap:24px;align-items:center;flex-wrap:wrap}
.kv img{max-width:340px;width:100%;border-radius:14px;box-shadow:0 8px 24px rgba(0,0,0,.2);background:#fff}
.small{font-size:13px;color:var(--muted)}