/* Clean, functional, student-friendly */
:root{
  --bg:#0b0f14;
  --panel:#0f1620;
  --text:#e8eef6;
  --muted:#b6c2d1;
  --link:#7dd3fc;
  --rule:#223043;
  --ok:#34d399;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}
a{color:var(--link);text-decoration:none}
a:hover{text-decoration:underline}
.container{width:min(980px,92vw);margin:0 auto;padding:18px 0}
header{position:sticky;top:0;background:rgba(11,15,20,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--rule);z-index:10}
.header-row{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap}
h1{margin:0;font-size:1.25rem}
.sub{color:var(--muted);font-size:.95rem;margin-top:4px}
nav{display:flex;gap:12px;flex-wrap:wrap}
main{padding:10px 0 26px}
section{padding:16px 0}
hr{border:none;border-top:1px solid var(--rule);margin:16px 0}
.lead{color:var(--muted);max-width:80ch}
.notice{margin-top:10px;padding:10px 12px;border-left:3px solid var(--link);color:var(--muted);background:rgba(255,255,255,.02)}
.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.card{border:1px solid var(--rule);border-radius:14px;padding:14px;background:rgba(255,255,255,.02)}
h2{margin:0 0 8px}
h3{margin:0 0 6px;font-size:1.05rem}
ul{margin:8px 0 0 20px}
li{margin:6px 0}
.btn{display:inline-block;margin-top:10px;padding:10px 12px;border:1px solid var(--rule);background:rgba(125,211,252,.10);color:var(--text);border-radius:10px;cursor:pointer}
.btn:hover{background:rgba(125,211,252,.16)}
.footer{border-top:1px solid var(--rule);color:var(--muted);font-size:.9rem;padding:14px 0}
.faq-item{border:1px solid var(--rule);border-radius:12px;padding:12px;background:rgba(255,255,255,.02);margin:10px 0}
.faq-q{display:flex;align-items:center;justify-content:space-between;gap:10px;cursor:pointer}
.faq-q span{color:var(--muted)}
.faq-a{display:none;margin-top:10px;color:var(--muted)}
.badge{display:inline-flex;align-items:center;gap:8px;color:var(--muted);font-size:.9rem}
.dot{width:10px;height:10px;border-radius:50%;background:var(--ok);display:inline-block}
@media(max-width:860px){.grid{grid-template-columns:1fr}}