:root {
  --blue: #4fb7d8;
  --blue-dark: #137b9c;
  --green: #7bcf9b;
  --green-soft: #e8faee;
  --sky: #e8f8fc;
  --mint: #f2fff6;
  --ink: #16323a;
  --muted: #567078;
  --line: #c9ebef;
  --white: #ffffff;
  --shadow: 0 18px 48px rgba(22, 50, 58, .12);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Tahoma", "Arial", sans-serif;
  color: var(--ink);
  background: linear-gradient(180deg, var(--sky), #fff 420px);
  line-height: 1.75;
}
a { color: var(--blue-dark); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; display: block; }
.container { width: min(1140px, calc(100% - 32px)); margin: 0 auto; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, .9);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--ink); font-weight: 700; font-size: 20px; }
.brand img { border-radius: 8px; }
.nav nav { display: flex; gap: 18px; flex-wrap: wrap; font-size: 15px; }
.nav-call { background: var(--green); color: #07361b; padding: 10px 14px; border-radius: 8px; font-weight: 700; white-space: nowrap; }
.home-hero, .article-hero { padding: 70px 0 56px; }
.two-col { display: grid; grid-template-columns: minmax(0, 1.02fr) minmax(300px, .98fr); gap: 38px; align-items: center; }
.eyebrow { display: inline-flex; background: var(--green-soft); color: #247346; padding: 5px 12px; border-radius: 999px; font-weight: 700; margin: 0 0 14px; }
h1, h2, h3 { line-height: 1.28; margin: 0 0 14px; }
h1 { font-size: clamp(34px, 5vw, 58px); letter-spacing: 0; }
h2 { font-size: clamp(25px, 3vw, 36px); }
h3 { font-size: 22px; }
.lead { font-size: 20px; color: var(--muted); margin: 0 0 24px; }
.cta-row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 11px 18px;
  border-radius: 8px;
  font-weight: 700;
  border: 1px solid transparent;
}
.btn.primary { background: var(--blue-dark); color: #fff; }
.btn.soft { background: var(--green-soft); color: #185f34; border-color: #bce8ca; }
.btn.outline { background: #fff; border-color: var(--blue); color: var(--blue-dark); }
.btn.full { width: 100%; margin-top: 10px; }
.image-link {
  display: block;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow);
  background: #fff;
}
.image-link img { width: 100%; aspect-ratio: 1.45 / 1; object-fit: cover; }
.image-link.wide { margin: 28px 0; }
.quick-answer, .topics, .faq-block, .reviews, .related { padding: 54px 0; }
.quick-answer { background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 30px; box-shadow: 0 12px 28px rgba(22, 50, 58, .06); }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 24px; }
.feature-card, .topic-group, .sticky-card, details, .review-card {
  background: rgba(255, 255, 255, .92);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 10px 24px rgba(22, 50, 58, .07);
}
.feature-card { padding: 18px; color: var(--ink); }
.feature-card span { display: block; color: var(--muted); font-size: 14px; }
.feature-card strong { display: block; margin-top: 6px; }
.section-lead { color: var(--muted); margin-bottom: 28px; }
.topic-group { padding: 24px; margin: 18px 0; scroll-margin-top: 92px; }
.topic-links, .link-list { columns: 2; padding-left: 20px; }
.topic-links li, .link-list li { break-inside: avoid; margin: 5px 0; }
.content-grid { display: grid; grid-template-columns: minmax(0, 1fr) 310px; gap: 34px; padding: 54px 0; }
.content-main { background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 30px; }
.breadcrumb { font-size: 14px; color: var(--muted); margin-bottom: 20px; }
.check-list { padding-left: 22px; }
.check-list li { margin: 8px 0; }
.sidebar { position: relative; }
.sticky-card { position: sticky; top: 96px; padding: 22px; }
.text-link { display: inline-block; margin-top: 12px; font-weight: 700; }
details { padding: 16px 18px; margin: 12px 0; }
summary { cursor: pointer; font-weight: 700; }
details p { margin-bottom: 0; color: var(--muted); }
.review-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.review-card { overflow: hidden; color: var(--ink); font-weight: 700; }
.review-card img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; }
.review-card span { display: block; padding: 12px 14px; }
.register-band { background: linear-gradient(135deg, var(--blue-dark), #35a678); color: #fff; padding: 44px 0; margin-top: 30px; }
.register-band p { color: rgba(255,255,255,.88); }
.register-band .btn.primary { background: #fff; color: var(--blue-dark); justify-self: end; }
.site-footer { background: #13333a; color: #e9fbff; margin-top: 0; padding: 42px 0 20px; }
.footer-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; gap: 28px; }
.site-footer a { color: #aaf0c1; }
.copyright { border-top: 1px solid rgba(255,255,255,.16); padding-top: 18px; margin-top: 24px; font-size: 14px; color: #b9d5da; }
@media (max-width: 860px) {
  .nav { align-items: flex-start; flex-direction: column; padding: 12px 0; }
  .nav nav { gap: 12px; }
  .two-col, .content-grid, .footer-grid { grid-template-columns: 1fr; }
  .feature-grid, .review-grid { grid-template-columns: 1fr; }
  .topic-links, .link-list { columns: 1; }
  .home-hero, .article-hero { padding-top: 42px; }
  .content-main { padding: 22px; }
}