:root{
  --ink:#1f2733; --muted:#5d6b7e; --line:#e6eaf0;
  --brand:#2f6f5e; --brand-dark:#235448; --accent:#e8b04b; --bg:#ffffff; --soft:#f6f8f9;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--ink);line-height:1.6;background:var(--bg);-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
:focus-visible{outline:3px solid var(--brand);outline-offset:2px;border-radius:4px}
.wrap{max-width:1080px;margin:0 auto;padding:0 24px}
h1,h2,h3{line-height:1.2;letter-spacing:-.01em}
.eyebrow{display:inline-block;font-size:13px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--brand);margin-bottom:14px}

.btn{display:inline-block;padding:13px 26px;border-radius:999px;font-weight:600;font-size:15px;transition:transform .15s ease,box-shadow .15s ease}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 6px 18px rgba(47,111,94,.28)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(47,111,94,.34)}
.btn-ghost{border:1.5px solid var(--line);color:var(--ink)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand)}

.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.9);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{font-weight:800;font-size:18px;color:var(--brand)}
.site-nav{display:flex;gap:6px}
.site-nav a{padding:8px 14px;border-radius:999px;font-size:14px;font-weight:600;color:var(--muted)}
.site-nav a:hover,.site-nav a.active{color:var(--brand);background:var(--soft)}

.site-footer{background:var(--soft);border-top:1px solid var(--line);padding:40px 0;text-align:center;margin-top:40px}
.site-footer p{font-size:14px;margin-bottom:6px}
.site-footer .muted{color:var(--muted)}
.site-footer .footer-logo{height:80px;width:auto;margin:0 auto 14px;opacity:.8}

.page-hero{background:radial-gradient(900px 400px at 80% -20%,rgba(232,176,75,.16),transparent 60%),linear-gradient(160deg,#fbfdfc 0%,#eef4f2 100%);border-bottom:1px solid var(--line);padding:56px 0 44px}
.page-hero h1{font-size:38px;font-weight:800;margin-bottom:12px}
.page-hero p{color:var(--muted);font-size:18px;max-width:42em}
.page-hero .back{font-size:14px;font-weight:600;color:var(--brand)}

main{min-height:40vh}
.section{padding:48px 0}
.section h2{font-size:24px;font-weight:800;margin-bottom:20px}

.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:20px}
.card{display:block;background:#fff;border:1px solid var(--line);border-radius:16px;padding:24px;transition:transform .15s ease,box-shadow .15s ease,border-color .15s ease}
.card:hover{transform:translateY(-4px);box-shadow:0 14px 32px rgba(31,39,51,.1);border-color:var(--brand)}
.card .tag{font-size:12px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--accent)}
.card h3{font-size:20px;margin:8px 0 6px}
.card p{font-size:14px;color:var(--muted)}
.card .meta{margin-top:14px;font-weight:600;color:var(--brand);font-size:14px}

.filter{margin:0 0 22px;display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.filter input{flex:1;min-width:220px;padding:12px 16px;border:1.5px solid var(--line);border-radius:999px;font-size:15px;font-family:inherit}
.filter input:focus{outline:none;border-color:var(--brand)}
.filter .n{font-size:13px;color:var(--muted);white-space:nowrap}

.lesson-rows{display:flex;flex-direction:column;gap:10px}
.row{display:flex;justify-content:space-between;align-items:center;gap:14px;background:#fff;border:1px solid var(--line);border-radius:12px;padding:15px 20px;transition:border-color .15s ease,transform .15s ease}
.row:hover{border-color:var(--brand);transform:translateX(3px)}
.row .t{font-weight:600}
.row .s{font-size:13px;color:var(--muted)}
.row .n{font-size:13px;color:var(--muted);white-space:nowrap}
.empty{color:var(--muted);padding:18px 0}

@media(max-width:820px){
  .page-hero{padding:44px 0 34px}
  .page-hero h1{font-size:30px}
  .site-header .wrap{height:56px}
  .brand{font-size:16px}
  .site-nav a{padding:8px 10px}
}
@media(prefers-reduced-motion:reduce){*{transition:none!important}html{scroll-behavior:auto}}