:root{
  --bg:#eef2f5;
  --surface:#ffffff;
  --surface-2:#f8fafc;
  --text:#12313f;
  --muted:#5f7380;
  --primary:#194d5f;
  --accent:#ef6b63;
  --line:#d8e1e8;
  --shadow:0 16px 40px rgba(18,49,63,.10);
  --radius-xl:28px;
  --radius-lg:20px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:Inter,Arial,Helvetica,sans-serif;
  background:linear-gradient(180deg,#f6f8fa 0%,#eef2f5 100%);
  color:var(--text);
}
img{display:block;max-width:100%}
a{text-decoration:none;color:inherit}
.hero{
  background:
    radial-gradient(circle at top right,rgba(239,107,99,.28),transparent 28%),
    linear-gradient(135deg,#113846 0%,#194d5f 55%,#2b6675 100%);
  color:#fff;
  padding:64px 20px;
}
.hero__inner{max-width:1200px;margin:0 auto}
.eyebrow{margin:0 0 12px;font-size:12px;font-weight:700;letter-spacing:.18em;text-transform:uppercase;opacity:.82}
.hero h1{margin:0;font-size:clamp(34px,6vw,64px);line-height:1.02}
.subtitle{max-width:760px;margin:16px 0 0;font-size:17px;line-height:1.7;opacity:.92}
.actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:28px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:48px;padding:0 20px;border-radius:999px;
  font-weight:700;background:#fff;color:var(--primary);
  box-shadow:0 8px 24px rgba(0,0,0,.15);
}
.btn--ghost{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.42);box-shadow:none}
.layout{
  max-width:1400px;
  margin:0 auto;
  padding:28px 20px 60px;
  display:grid;
  grid-template-columns:300px minmax(0,1fr);
  gap:24px;
}
.sidebar__sticky{
  position:sticky;top:20px;
  background:rgba(255,255,255,.84);
  backdrop-filter:blur(10px);
  border:1px solid rgba(216,225,232,.95);
  border-radius:var(--radius-xl);
  padding:20px;
  box-shadow:var(--shadow);
}
.sidebar__header{display:flex;align-items:center;justify-content:space-between;gap:12px}
.sidebar h2{margin:0;font-size:24px}
.badge{
  display:inline-flex;align-items:center;justify-content:center;
  min-width:70px;padding:8px 12px;border-radius:999px;
  font-size:13px;font-weight:700;background:#eaf1f5;color:var(--primary)
}
.sidebar__note{margin:8px 0 18px;color:var(--muted);font-size:14px;line-height:1.6}
.thumb-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.thumb-link{
  overflow:hidden;border-radius:16px;background:var(--surface);
  border:1px solid var(--line);box-shadow:0 8px 18px rgba(18,49,63,.06);
  transition:transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.thumb-link:hover{transform:translateY(-2px);box-shadow:0 14px 26px rgba(18,49,63,.12);border-color:#bfd0da}
.thumb-link img{aspect-ratio:1 / 1;object-fit:cover}
.content{display:grid;gap:22px}
.page-card{
  background:rgba(255,255,255,.88);
  backdrop-filter:blur(8px);
  border:1px solid var(--line);
  border-radius:var(--radius-xl);
  padding:20px;
  box-shadow:var(--shadow);
}
.page-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:14px}
.page-meta{font-size:13px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);margin-bottom:6px}
.page-head h3{margin:0;font-size:24px;line-height:1.2;color:var(--primary)}
.page-jump{
  white-space:nowrap;
  font-size:14px;font-weight:700;color:var(--primary);
  background:#edf4f7;border:1px solid #d8e5eb;border-radius:999px;padding:10px 14px;
}
.page-card img{width:100%;height:auto;border-radius:18px;border:1px solid #edf1f4;background:#fff}
@media (max-width:1024px){
  .layout{grid-template-columns:1fr}
  .sidebar__sticky{position:static}
  .thumb-grid{grid-template-columns:repeat(5,minmax(0,1fr))}
}
@media (max-width:760px){
  .hero{padding:48px 16px}
  .layout{padding:18px 16px 40px}
  .thumb-grid{grid-template-columns:repeat(3,minmax(0,1fr))}
  .page-card{padding:14px;border-radius:22px}
  .page-head{flex-direction:column;align-items:flex-start}
  .page-head h3{font-size:20px}
}
@media (max-width:520px){
  .thumb-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .subtitle{font-size:15px}
  .btn{width:100%}
}