:root {
  --bg: #f7fbfc;
  --paper: #ffffff;
  --ink: #18323a;
  --muted: #5c7078;
  --line: #dce9ec;
  --accent: #087f8c;
  --accent-2: #0b4f6c;
  --warm: #f0b429;
  --soft: #e8f6f8;
  --wrap: 1680px;
  --radius: 20px;
  --shadow: 0 18px 48px rgba(12,56,68,.11);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin:0; font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color: var(--ink); background:
    radial-gradient(circle at top left, rgba(8,127,140,.16), transparent 34rem),
    linear-gradient(180deg, #f4fbfc 0%, #ffffff 44%, #f7fbfc 100%);
  line-height:1.65;
}
a { color: var(--accent-2); text-decoration-thickness: .1em; text-underline-offset: .18em; }
a:hover { color: var(--accent); }
.wrap { width:min(var(--wrap), calc(100% - 48px)); margin-inline:auto; }
.skip-link { position:absolute; left:-999px; top:auto; width:1px; height:1px; overflow:hidden; }
.skip-link:focus { left:24px; top:16px; width:auto; height:auto; padding:10px 14px; background:#fff; border:2px solid var(--accent); z-index:10; }
.site-header {
  background: rgba(255,255,255,.92); backdrop-filter: blur(14px);
  border-bottom:1px solid var(--line); position:sticky; top:0; z-index:5;
}
.header-inner { display:flex; align-items:center; justify-content:space-between; gap:22px; padding:16px 0; }
.brand { display:flex; align-items:center; gap:12px; text-decoration:none; color:var(--ink); min-width:260px; }
.brand img { width:42px; height:42px; }
.brand strong { display:block; font-size:1.08rem; letter-spacing:.01em; }
.brand span { display:block; color:var(--muted); font-size:.88rem; line-height:1.25; }
.nav { display:flex; flex-wrap:wrap; gap:8px; justify-content:flex-end; align-items:center; }
.nav a { text-decoration:none; color:var(--ink); padding:9px 12px; border-radius:999px; font-weight:650; font-size:.94rem; }
.nav a:hover, .nav a[aria-current="page"] { background:var(--soft); color:var(--accent-2); }
.hero { padding:70px 0 38px; }
.hero-card {
  display:grid; grid-template-columns:minmax(0, 1.15fr) minmax(320px, .85fr); gap:28px;
  background:linear-gradient(135deg, rgba(255,255,255,.96), rgba(232,246,248,.96));
  border:1px solid var(--line); border-radius:28px; box-shadow:var(--shadow); padding:36px;
}
.kicker { color:var(--accent-2); font-weight:800; text-transform:uppercase; letter-spacing:.08em; font-size:.82rem; }
h1 { font-size:clamp(2.2rem, 4.1vw, 5.2rem); line-height:1.02; margin:.18em 0 .28em; letter-spacing:-.045em; }
h2 { font-size:clamp(1.55rem, 2.2vw, 2.35rem); line-height:1.15; margin:1.45em 0 .55em; letter-spacing:-.02em; }
h3 { font-size:1.18rem; margin:1.2em 0 .35em; }
.lede { font-size:clamp(1.07rem, 1.3vw, 1.28rem); color:#38545c; max-width:76rem; }
.hero-aside {
  background:#fff; border:1px solid var(--line); border-radius:24px; padding:24px; align-self:stretch;
  display:flex; flex-direction:column; justify-content:center;
}
.stat-grid { display:grid; grid-template-columns:repeat(2, minmax(0,1fr)); gap:14px; margin-top:16px; }
.stat { background:var(--soft); border-radius:18px; padding:16px; }
.stat strong { display:block; font-size:1.35rem; color:var(--accent-2); }
.cta-row { display:flex; flex-wrap:wrap; gap:12px; margin-top:24px; }
.button {
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  background:var(--accent-2); color:#fff; text-decoration:none; border-radius:999px; padding:12px 17px; font-weight:800;
}
.button.secondary { background:#fff; color:var(--accent-2); border:1px solid var(--line); }
.section { padding:34px 0; }
.grid { display:grid; grid-template-columns:repeat(3, minmax(0, 1fr)); gap:18px; }
.card {
  background:var(--paper); border:1px solid var(--line); border-radius:var(--radius); box-shadow:0 10px 28px rgba(12,56,68,.06);
  padding:22px;
}
.card h3 { margin-top:0; }
.card p { color:#475e66; }
.card .small { font-size:.92rem; color:var(--muted); }
.article-grid { display:grid; grid-template-columns:repeat(3, minmax(0, 1fr)); gap:18px; }
.article-card { display:flex; flex-direction:column; justify-content:space-between; min-height:260px; }
.badges { display:flex; flex-wrap:wrap; gap:8px; margin:14px 0; }
.badge { background:var(--soft); border:1px solid var(--line); padding:5px 9px; border-radius:999px; font-size:.78rem; font-weight:700; color:var(--accent-2); }
.content-layout { display:grid; grid-template-columns:minmax(0, 1fr) 340px; gap:26px; align-items:start; padding:34px 0; }
.main-content { background:#fff; border:1px solid var(--line); border-radius:24px; padding:clamp(22px, 3vw, 42px); box-shadow:0 12px 34px rgba(12,56,68,.06); }
.main-content p { font-size:1.03rem; }
.toc, .side-card { background:#fff; border:1px solid var(--line); border-radius:20px; padding:18px; margin-bottom:18px; }
.toc strong, .side-card strong { display:block; margin-bottom:8px; }
.toc a { display:block; padding:7px 0; text-decoration:none; border-bottom:1px dashed var(--line); }
.notice { background:#fff8e6; border:1px solid #f4d58d; border-radius:18px; padding:18px; }
.related-list { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:12px; margin-top:14px; }
.related-list a { display:block; padding:12px; border:1px solid var(--line); border-radius:14px; background:#f9fcfd; text-decoration:none; font-weight:700; }
.footer { margin-top:44px; background:#102f3a; color:#eaf7f9; padding:38px 0; }
.footer a { color:#fff; }
.footer-grid { display:grid; grid-template-columns:2fr 1fr 1fr; gap:24px; }
.footer small { color:#b9d2d9; }
.breadcrumbs { font-size:.92rem; color:var(--muted); margin:16px 0 0; }
.breadcrumbs a { text-decoration:none; }
.faq-item { border-top:1px solid var(--line); padding:18px 0; }
.faq-item:first-child { border-top:0; }
.source-list li { margin-bottom:12px; }
@media (max-width: 1050px) {
  .hero-card, .content-layout, .footer-grid { grid-template-columns:1fr; }
  .article-grid, .grid { grid-template-columns:repeat(2, minmax(0,1fr)); }
  .header-inner { align-items:flex-start; flex-direction:column; }
  .nav { justify-content:flex-start; }
}
@media (max-width: 680px) {
  .wrap { width:min(100% - 28px, var(--wrap)); }
  .hero-card { padding:24px; border-radius:22px; }
  .article-grid, .grid, .related-list, .stat-grid { grid-template-columns:1fr; }
  h1 { font-size:2.3rem; }
  .nav a { padding:8px 9px; font-size:.9rem; }
}