:root{
  --blue:#194fb6;
  --blue2:#0b3b8f;
  --ink:#172033;
  --muted:#59657a;
  --paper:#ffffff;
  --soft:#f4f7fb;
  --line:#dfe6f0;
  --green:#087f5b;
  --amber:#b45309;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,Arial,Helvetica,sans-serif;background:var(--soft);color:var(--ink);line-height:1.72}
a{color:var(--blue)}
a:hover{text-decoration-thickness:2px}
.site-header{background:linear-gradient(135deg,var(--blue2),var(--blue));color:#fff}
.nav-wrap{max-width:1180px;margin:auto;padding:18px 24px;display:flex;gap:22px;align-items:center;flex-wrap:wrap}
.brand{font-size:21px;font-weight:900;color:#fff;text-decoration:none;margin-right:auto}
nav{display:flex;gap:17px;flex-wrap:wrap}
nav a{color:#fff;text-decoration:none;font-weight:750}
.hero{background:linear-gradient(135deg,#f7fbff,#e8f0ff);border-bottom:1px solid var(--line)}
.hero-inner{max-width:1180px;margin:auto;padding:64px 24px 54px}
.eyebrow{display:inline-block;background:#dbeafe;color:#1747a6;padding:6px 12px;border-radius:999px;font-weight:850;font-size:14px}
h1{font-size:clamp(34px,5vw,56px);line-height:1.08;margin:16px 0 18px;max-width:980px}
.hero p{font-size:19px;max-width:880px;color:#2c3950}
main{max-width:1180px;margin:auto;padding:32px 24px 56px}
.card{background:var(--paper);border:1px solid var(--line);border-radius:18px;padding:26px;margin:20px 0;box-shadow:0 8px 24px rgba(20,42,82,.06)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(270px,1fr));gap:18px}
.lesson-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px;display:flex;flex-direction:column}
.lesson-card h3{margin:0 0 10px;line-height:1.3}
.lesson-card p{color:var(--muted);flex:1}
.meta{display:flex;gap:10px;flex-wrap:wrap;color:var(--muted);font-size:14px;margin:12px 0}
.tag{display:inline-block;background:#edf4ff;color:#1747a6;padding:4px 9px;border-radius:999px;font-size:13px;font-weight:800}
.author-box{background:#eef6ff;border-left:5px solid var(--blue);padding:16px 18px;border-radius:10px;margin:20px 0}
.objectives li{margin:8px 0}
.question{border:1px solid var(--line);border-radius:14px;padding:18px;margin:14px 0;background:#fbfdff}
.question summary{font-weight:850;cursor:pointer}
.answer{margin-top:12px;padding-top:12px;border-top:1px dashed #cbd5e1}
.answer strong{color:var(--green)}
.note{background:#fff8e8;border:1px solid #f2d49a;border-radius:14px;padding:18px}
.cta{display:inline-block;background:var(--blue);color:white;text-decoration:none;font-weight:850;padding:11px 16px;border-radius:11px}
.breadcrumbs{font-size:14px;color:var(--muted);margin-bottom:18px}
footer{background:#111a2d;color:#dce5f3}
.footer-inner{max-width:1180px;margin:auto;padding:34px 24px}
footer a{color:#fff;margin-right:16px}
table{width:100%;border-collapse:collapse}
th,td{border:1px solid var(--line);padding:12px;text-align:left;vertical-align:top}
th{background:#edf4ff}
@media(max-width:720px){
  .nav-wrap{align-items:flex-start}
  .brand{width:100%}
  h1{font-size:36px}
  .hero-inner{padding-top:44px}
}