:root {
  --bg: #eef3f8;
  --panel: #ffffff;
  --panel-soft: #f7f9fc;
  --text: #172033;
  --muted: #627086;
  --cyan: #2a5fbf;
  --purple: #174793;
  --accent: #2a5fbf;
  --gold: #ffd326;
  --deep: #10203d;
  --line: rgba(33, 70, 126, .14);
  --content: #ffffff;
  --body: #20293a;
  --max: 1360px;
  --radius: 8px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--bg); }
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--body);
  background: var(--bg);
  line-height: 1.65;
  text-rendering: optimizeSpeed;
  overflow-x: hidden;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background: linear-gradient(180deg, #ffffff 0, #eef3f8 190px, #e7edf5 100%);
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }
.vh-site-header {
  position: sticky; top: 0; z-index: 20;
  background: rgba(255, 255, 255, .96);
  border-bottom: 1px solid rgba(33,70,126,.12);
  box-shadow: 0 10px 28px rgba(24, 54, 94, .1);
  backdrop-filter: blur(12px);
}
.vh-header-inner {
  min-height: 78px; width: 100%; margin: 0 auto; padding: 0 28px; display: grid; grid-template-columns: minmax(172px, 230px) minmax(0, 1fr) auto; align-items: center; gap: 18px;
}
.vh-logo { justify-self: start; min-width: 0; }
.vh-logo img { width: 188px; max-height: 64px; object-fit: contain; }
.vh-site-nav { display: flex; align-items: center; gap: 7px; font-size: 11px; font-weight: 800; text-transform: uppercase; color: var(--text); flex-wrap: nowrap; justify-content: center; min-width: 0; }
.vh-site-nav a { text-decoration: none; white-space: nowrap; padding: 7px 9px; border-radius: 8px; background: #f5f8fc; border: 1px solid rgba(42,95,191,.16); color: #23304a; transition: background .18s ease, border-color .18s ease, color .18s ease, box-shadow .18s ease; }
.vh-site-nav a:hover,
.vh-site-nav a:focus-visible { background: #ffffff; border-color: rgba(42,95,191,.55); color: var(--accent); box-shadow: 0 8px 18px rgba(42,95,191,.14); outline: 0; }
.vh-header-actions { display: flex; gap: 10px; justify-self: end; }
.vh-btn, .vh-header-actions a {
  display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 10px 20px;
  border-radius: 8px; border: 1px solid rgba(25,73,153,.18); background: linear-gradient(135deg, #326ed0 0%, #2459b7 58%, #174793 100%);
  color: #ffffff; font-weight: 900; line-height: 1; text-decoration: none; box-shadow: 0 12px 24px rgba(42,95,191,.24), inset 0 1px 0 rgba(255,255,255,.26); transition: transform .18s ease, background .18s ease, border-color .18s ease, box-shadow .18s ease, color .18s ease;
}
.vh-btn:hover,
.vh-btn:focus-visible,
.vh-header-actions a:hover,
.vh-header-actions a:focus-visible { background: linear-gradient(135deg, #3f7ae0 0%, #2459b7 62%, #123e84 100%); border-color: rgba(255,255,255,.32); color: #ffffff; box-shadow: 0 16px 34px rgba(42,95,191,.34), 0 0 0 1px rgba(255,255,255,.12), inset 0 1px 0 rgba(255,255,255,.24); transform: translateY(-1px); outline: 0; }
.vh-header-actions a { white-space: nowrap; }
.vh-btn-dark { background: #eef2f7 !important; color: #182338 !important; border-color: rgba(42,95,191,.14) !important; box-shadow: inset 0 0 0 1px rgba(255,255,255,.55) !important; }
.vh-btn-dark:hover,
.vh-btn-dark:focus-visible { background: #dfe7f2 !important; border-color: rgba(42,95,191,.32) !important; color: var(--accent) !important; box-shadow: 0 12px 26px rgba(42,95,191,.18), inset 0 1px 0 rgba(255,255,255,.8) !important; }
.vh-menu-toggle { display: none; width: 44px; height: 44px; border: 1px solid rgba(42,95,191,.2); border-radius: 8px; background: #f4f7fb; color: var(--accent); justify-self: end; }
.vh-menu-toggle:hover,
.vh-menu-toggle:focus-visible { background: #ffffff; border-color: rgba(42,95,191,.5); outline: 0; }
.vh-menu-toggle span { display: block; height: 3px; margin: 7px 6px; background: currentColor; }
.vh-hero { color: #fff; border-bottom: 1px solid rgba(42,95,191,.14); background: var(--deep); background-size: cover; background-position: center; }
.vh-hero-inner { min-height: 430px; padding: 74px max(24px, calc((100vw - var(--max)) / 2)) 70px; display: grid; grid-template-columns: minmax(300px, 590px) 1fr; align-items: center; gap: 30px; background: linear-gradient(90deg, rgba(10,20,39,.92), rgba(21,50,95,.72) 46%, rgba(42,95,191,.16)); }
.vh-hero-kicker { color: var(--gold); font-weight: 900; text-transform: uppercase; letter-spacing: .02em; }
h1,h2,h3 { margin: 0 0 18px; color: var(--text); line-height: 1.15; }
.vh-hero h1 { color: #fff; font-size: clamp(34px, 3vw, 54px); max-width: 720px; text-shadow: 0 3px 18px rgba(0,0,0,.75); }
.vh-hero p { max-width: 640px; margin: 0 0 26px; color: rgba(255,255,255,.9); font-size: 18px; }
.vh-section { padding: 64px 20px; }
.vh-container { width: 100%; max-width: var(--max); margin: 0 auto; }
.vh-content-layout { display: grid; grid-template-columns: minmax(0, 1fr) 310px; gap: 28px; align-items: start; }
.vh-content-card, .vh-side-box { background: rgba(255,255,255,.96); border: 1px solid rgba(33,70,126,.12); border-radius: var(--radius); box-shadow: 0 18px 42px rgba(24,54,94,.12); }
.vh-content-card { padding: 30px; min-width: 0; }
.vh-content-card p { margin: 0 0 18px; }
.vh-content-card h2 { margin-top: 34px; font-size: 28px; color: #172033; }
.vh-content-card h3 { margin-top: 24px; font-size: 21px; color: #172033; }
.vh-content-card ul, .vh-content-card ol { padding-left: 22px; margin: 0 0 22px; }
.vh-content-card li { margin: 7px 0; }
.vh-content-card table { display: block; width: 100%; max-width: 100%; border-collapse: collapse; margin: 22px 0; overflow-x: auto; border-radius: 8px; }
.vh-content-card thead, .vh-content-card tbody { display: table; width: 100%; min-width: 620px; table-layout: fixed; }
.vh-content-card th, .vh-content-card td { border: 1px solid rgba(33,70,126,.12); padding: 11px 12px; vertical-align: top; }
.vh-content-card th { background: #eef4fb; color: #172033; text-align: left; }
.vh-content-card tr:nth-child(even) td { background: #f8fafc; }
.vh-article-meta { display: flex; flex-wrap: wrap; gap: 10px; margin: 0 0 22px; color: var(--muted); font-size: 14px; }
.vh-article-meta span { background: rgba(42,95,191,.08); border: 1px solid rgba(42,95,191,.2); padding: 7px 10px; border-radius: 999px; }
.vh-article-meta-bottom { margin: 34px 0 0; }
.vh-article-figure { margin: 26px 0; border: 1px solid rgba(42,95,191,.16); border-radius: 8px; overflow: hidden; background: #eef3f8; }
.vh-article-figure img { width: 100%; aspect-ratio: 16/7.5; object-fit: cover; }
.vh-article-figure figcaption { padding: 10px 12px; color: var(--muted); font-size: 13px; }
.vh-author-box { display: grid; grid-template-columns: 96px 1fr; gap: 18px; margin-top: 34px; padding: 18px; border: 1px solid rgba(42,95,191,.18); border-radius: 8px; background: #f7f9fc; }
.vh-author-avatar { width: 96px; height: 96px; border-radius: 50%; object-fit: cover; background: linear-gradient(135deg, #eef4fb, #dbe8f8); border: 2px solid #2a5fbf; display: block; color: var(--accent); font-size: 28px; font-weight: 900; }
.vh-author-avatar::before { content: "FS"; }
.vh-author-body p { margin: 6px 0 10px; color: var(--muted); }
.vh-author-body strong { color: var(--accent); font-size: 18px; }
.vh-author-links { display: flex; flex-wrap: wrap; gap: 10px; color: var(--muted); font-size: 13px; }
.vh-sidebar { position: sticky; top: 84px; }
.vh-side-box { padding: 18px; }
.vh-side-box strong { display: block; margin-bottom: 12px; color: var(--accent); font-size: 18px; }
.vh-toc-nav { display: grid; gap: 6px; margin-bottom: 18px; max-height: 62vh; overflow: auto; padding-right: 4px; }
.vh-toc-nav a { text-decoration: none; padding: 8px 9px; border-radius: 8px; background: #f5f8fc; color: var(--body); font-size: 13px; line-height: 1.25; border: 1px solid rgba(42,95,191,.14); transition: background .18s ease, border-color .18s ease, color .18s ease; }
.vh-toc-nav a:hover,
.vh-toc-nav a:focus-visible { background: #ffffff; border-color: rgba(42,95,191,.45); color: var(--accent); outline: 0; }
.vh-toc-sub { margin-left: 12px; opacity: .9; }
.vh-site-footer { background: #ffffff; border-top: 1px solid rgba(33,70,126,.12); }
.vh-footer-main { padding: 34px 20px 22px; display: grid; grid-template-columns: minmax(260px, 340px) minmax(320px, .85fr) minmax(430px, 560px); gap: 54px; align-items: start; }
.vh-footer-left { color: var(--muted); font-size: 14px; line-height: 1.18; }
.vh-footer-logo { display: block; width: min(100%, 150px); color: var(--accent); margin-bottom: 14px; }
.vh-footer-logo svg { display: block; width: 100%; height: auto; fill: currentColor; }
.vh-footer-text { display: grid; gap: 14px; }
.vh-footer-text p { margin: 0; }
.vh-footer-copyright { margin-top: 22px; padding-top: 18px; border-top: 1px solid rgba(42,95,191,.18); }
.vh-footer-center { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 2px 24px; padding: 18px 0; border-top: 1px solid rgba(42,95,191,.18); border-bottom: 1px solid rgba(42,95,191,.18); min-width: 0; }
.vh-footer-center a,
.vh-footer-center span { color: var(--accent); min-height: 66px; display: flex; align-items: center; justify-content: center; min-width: 0; }
.vh-footer-center svg { display: block; width: 150px; max-width: 100%; height: auto; fill: currentColor; }
.vh-age-badge svg { width: 112px; }
.vh-footer-right { display: grid; grid-template-columns: repeat(2, minmax(150px, 1fr)); gap: 13px 28px; align-content: start; padding-top: 4px; }
.vh-footer-right a { color: #23304a; text-decoration: none; font-size: 15px; font-weight: 700; line-height: 1.25; transition: color .18s ease, text-shadow .18s ease; }
.vh-footer-right a:hover,
.vh-footer-right a:focus-visible { color: var(--accent); text-shadow: 0 0 16px rgba(42,95,191,.16); outline: 0; }
.vh-footer-badges,
.vh-footer-badge,
.vh-footer-copy-block,
.vh-footer-menu,
.vh-footer-bottom { display: none; }
@media (max-width: 1320px) {
  .vh-header-inner { grid-template-columns: minmax(160px, 210px) 1fr auto; gap: 12px; padding: 10px 18px; }
  .vh-logo img { width: 172px; }
  .vh-site-nav { grid-column: 1 / -1; grid-row: 2; flex-wrap: wrap; justify-content: center; }
}
@media (max-width: 1100px) {
  .vh-content-layout, .vh-footer-main { grid-template-columns: 1fr; }
  .vh-footer-main { gap: 28px; }
  .vh-footer-center { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px 24px; }
  .vh-footer-right { grid-template-columns: repeat(3, minmax(140px, 1fr)); }
  .vh-sidebar { position: static; width: min(100%, 520px); }
}
@media (max-width: 760px) {
  .vh-header-inner { grid-template-columns: 1fr 44px; padding: 10px 14px; }
  .vh-logo img { width: 156px; }
  .vh-menu-toggle { display: block; }
  .vh-site-nav { display: none; grid-column: 1 / -1; grid-row: 2; }
  .vh-site-nav.vh-is-open { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .vh-site-nav a { text-align: center; white-space: normal; }
  .vh-header-actions { grid-column: 1 / -1; grid-row: 3; width: 100%; }
  .vh-header-actions a { flex: 1; }
  .vh-hero-inner { min-height: 360px; grid-template-columns: 1fr; padding: 54px 20px; }
  .vh-content-card { padding: 20px; }
  .vh-author-box { grid-template-columns: 1fr; }
  .vh-footer-center { grid-template-columns: 1fr; }
  .vh-footer-right { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px 16px; }
  .vh-footer-right a { font-size: 14px; }
}
@media (max-width: 430px) {
  .vh-footer-right { grid-template-columns: 1fr; }
}