:root{--bg:#f6f8fc;--panel:#fff;--ink:#17202e;--muted:#64708a;--accent:#2d7d6a;--line:#e3e8f1}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--ink);line-height:1.6}
.wrap{max-width:1000px;margin:0 auto;padding:0 20px}
a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}
h1,h2,h3{letter-spacing:-.02em}
.btn{display:inline-block;background:var(--accent);color:#fff;border:0;padding:12px 24px;border-radius:10px;font:inherit;font-weight:600;cursor:pointer}
.btn:hover{opacity:.92}.btn.ghost{background:0;border:1px solid var(--line);color:var(--ink)}
.nav{background:var(--panel);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
.nav .wrap{display:flex;align-items:center;gap:18px;height:64px}
.brand{font-weight:700;font-size:1.15rem;color:var(--ink)}
.nav nav{margin-left:auto;display:flex;gap:20px}.nav nav a{color:var(--muted)}
.hero{padding:88px 0;text-align:center;background:radial-gradient(1000px 380px at 50% -10%,rgba(45,125,106,.14),transparent)}
.hero h1{font-size:2.6rem;margin:0 0 14px}.hero p{max-width:560px;margin:0 auto 26px;color:var(--muted);font-size:1.12rem}
section{margin:72px auto}h2{font-size:1.7rem}
.levels{display:flex;gap:10px;flex-wrap:wrap;margin:18px 0 24px}
.lv{background:var(--panel);border:1px solid var(--line);color:var(--muted);padding:8px 16px;border-radius:999px;cursor:pointer;font:inherit}
.lv.active{background:var(--accent);color:#fff;border-color:var(--accent)}
.courses{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.course{background:var(--panel);border:1px solid var(--line);border-radius:14px;overflow:hidden;display:flex;flex-direction:column}
.course .thumb{height:96px}
.course .body{padding:18px;display:flex;flex-direction:column;gap:8px;flex:1}
.course h3{margin:0;font-size:1.1rem}
.badge{align-self:flex-start;font-size:.72rem;padding:2px 9px;border-radius:999px;background:var(--line);color:var(--muted)}
.course p{margin:0;color:var(--muted);font-size:.92rem;flex:1}
.course .enroll{margin-top:6px;background:0;border:1px solid var(--accent);color:var(--accent);padding:9px;border-radius:9px;cursor:pointer;font:inherit;font-weight:600}
.course .enroll:hover{background:var(--accent);color:#fff}
.how ol{list-style:none;counter-reset:s;padding:0;display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.how li{counter-increment:s;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:22px;display:flex;flex-direction:column;gap:6px}
.how li:before{content:counter(s);width:34px;height:34px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700}
.how b{font-size:1.05rem}.how span{color:var(--muted)}
footer{background:var(--panel);border-top:1px solid var(--line);padding:26px 20px;text-align:center;color:var(--muted);margin-top:40px}
.muted{color:var(--muted)}
.modal{position:fixed;inset:0;background:rgba(10,15,25,.55);display:flex;align-items:center;justify-content:center;z-index:20}
.modal[hidden]{display:none}
.box{background:var(--panel);border-radius:16px;padding:32px;width:min(420px,92vw);position:relative;border:1px solid var(--line)}
.x{position:absolute;top:12px;right:16px;background:0;border:0;color:var(--muted);font-size:1.6rem;cursor:pointer}
#enrollForm{display:flex;flex-direction:column;gap:12px;margin-top:14px}
#enrollForm input{padding:12px;border-radius:10px;border:1px solid var(--line);background:var(--bg);color:var(--ink);font:inherit}
.ok{color:#2d7d6a}
@media(max-width:760px){.courses,.how ol{grid-template-columns:1fr}.hero h1{font-size:2rem}.nav nav{display:none}}