:root {
  --ink: #142033;
  --muted: #627087;
  --line: #dbe3ec;
  --paper: #fffdf8;
  --cream: #f4efe5;
  --blue: #1b66db;
  --blue-dark: #124ca7;
  --green: #15965a;
  --orange: #ef8c2f;
  --shadow: 0 24px 70px rgba(28, 45, 72, .10);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); background: var(--paper); font-family: Manrope, sans-serif; line-height: 1.65; }
a { color: inherit; }
img { max-width: 100%; }
.seo-bg { position: fixed; inset: 0; pointer-events: none; z-index: -1; background: radial-gradient(circle at 8% 4%, rgba(239,140,47,.14), transparent 25%), radial-gradient(circle at 90% 14%, rgba(27,102,219,.12), transparent 28%), linear-gradient(180deg,#fffdf8 0,#f7f9fc 58%,#fffdf8 100%); }
.site-head { width: min(1180px, calc(100% - 36px)); margin: 18px auto 0; min-height: 68px; padding: 10px 12px 10px 16px; display: flex; align-items: center; justify-content: space-between; gap: 22px; border: 1px solid rgba(199,210,224,.8); border-radius: 18px; background: rgba(255,255,255,.88); backdrop-filter: blur(18px); position: sticky; top: 12px; z-index: 30; box-shadow: 0 12px 38px rgba(38,55,80,.08); }
.brand { display:flex; align-items:center; gap:10px; text-decoration:none; font-weight:800; font-size:18px; }
.brand img { width:38px; height:38px; border-radius:50%; box-shadow:0 7px 18px rgba(27,102,219,.2); }
.head-nav { display:flex; align-items:center; gap:24px; margin-left:auto; }
.head-nav a { color:var(--muted); text-decoration:none; font-size:14px; font-weight:700; }
.head-nav a:hover { color:var(--blue); }
.head-cta, .btn { text-decoration:none; border-radius:12px; padding:12px 18px; font-weight:800; display:inline-flex; align-items:center; justify-content:center; gap:8px; }
.head-cta { background:var(--ink); color:white; }
.wrap { width:min(1060px, calc(100% - 36px)); margin:0 auto; }
.breadcrumbs { padding:34px 0 12px; display:flex; gap:9px; flex-wrap:wrap; color:#78859a; font-size:13px; }
.breadcrumbs a { text-decoration:none; }
.breadcrumbs span::before { content:'·'; margin-right:9px; }
.article-hero { padding:44px 0 38px; display:grid; grid-template-columns:minmax(0,1.25fr) minmax(300px,.75fr); gap:44px; align-items:center; }
.article-hero.no-visual { grid-template-columns:1fr; max-width:900px; }
.kicker { text-transform:uppercase; letter-spacing:.12em; font-size:12px; color:var(--blue); font-weight:800; }
h1,h2,h3 { line-height:1.15; letter-spacing:-.035em; margin-top:0; }
h1 { font-family:Unbounded,Manrope,sans-serif; font-size:clamp(38px,6vw,66px); margin:14px 0 22px; }
h2 { font-size:clamp(28px,4vw,42px); margin-bottom:18px; }
h3 { font-size:21px; margin-bottom:10px; }
.lead { font-size:20px; color:#46546a; max-width:760px; margin:0; }
.meta { display:flex; gap:18px; flex-wrap:wrap; color:#8190a5; font-size:13px; margin-top:22px; }
.hero-visual { border-radius:24px; overflow:hidden; background:#eef4fb; border:1px solid var(--line); box-shadow:var(--shadow); transform:rotate(1.5deg); }
.hero-visual img { display:block; width:100%; aspect-ratio:4/3; object-fit:cover; object-position:left top; }
.quick { margin:18px 0 58px; padding:28px 30px; border-radius:22px; color:white; background:linear-gradient(125deg,#142033,#173a69); box-shadow:var(--shadow); position:relative; overflow:hidden; }
.quick::after { content:'↗'; position:absolute; right:24px; top:8px; font-size:76px; opacity:.09; }
.quick strong { color:#8cc1ff; display:block; margin-bottom:8px; text-transform:uppercase; letter-spacing:.1em; font-size:12px; }
.quick p { font-size:18px; margin:0; max-width:850px; }
.section { padding:56px 0; border-top:1px solid var(--line); }
.section-intro { max-width:780px; color:#526077; font-size:18px; margin-bottom:28px; }
.prose { max-width:820px; }
.prose p { color:#445269; font-size:17px; }
.matrix-wrap { overflow-x:auto; border:1px solid var(--line); border-radius:20px; background:white; box-shadow:0 14px 45px rgba(38,55,80,.06); }
.matrix { width:100%; border-collapse:collapse; min-width:760px; }
.matrix th,.matrix td { padding:18px 20px; vertical-align:top; text-align:left; border-bottom:1px solid var(--line); }
.matrix th { background:#f3f6fa; font-size:13px; text-transform:uppercase; letter-spacing:.06em; color:#66758a; }
.matrix td:first-child { width:160px; font-weight:800; color:#26354c; }
.matrix td:nth-child(3) { background:#f3f8ff; }
.matrix tr:last-child td { border-bottom:0; }
.duo { display:grid; grid-template-columns:1fr 1fr; gap:18px; }
.choice { border:1px solid var(--line); background:white; border-radius:20px; padding:26px; }
.choice.yet { border-color:#b8d3fa; background:#f2f7ff; }
.choice p { color:#536177; margin-bottom:0; }
.steps { display:grid; grid-template-columns:repeat(2,1fr); gap:16px; counter-reset:steps; }
.step { counter-increment:steps; background:white; border:1px solid var(--line); border-radius:18px; padding:24px; }
.step::before { content:'0' counter(steps); display:block; color:var(--orange); font-weight:800; margin-bottom:18px; }
.step p { color:#526077; margin:0; }
.chips { display:flex; flex-wrap:wrap; gap:10px; margin-top:22px; }
.chip { background:#edf3fb; color:#34506f; border-radius:999px; padding:8px 12px; font-size:13px; font-weight:700; }
.feature-grid { display:grid; grid-template-columns:repeat(2,1fr); gap:16px; }
.feature { padding:22px; border-radius:18px; background:#f7f9fc; border:1px solid var(--line); }
.feature b { display:block; margin-bottom:7px; }
.feature span { color:#5e6b7f; }
.three { display:grid; grid-template-columns:repeat(3,1fr); gap:16px; }
.note-card { border-top:3px solid var(--orange); background:white; border-radius:0 0 16px 16px; padding:20px; box-shadow:0 10px 35px rgba(34,48,70,.06); }
.note-card.metric { border-color:var(--green); }
.note-card p { margin:0; color:#536177; }
.faq { display:grid; gap:12px; }
details { background:white; border:1px solid var(--line); border-radius:16px; padding:0 20px; }
summary { cursor:pointer; font-weight:800; padding:18px 28px 18px 0; position:relative; list-style:none; }
summary::after { content:'+'; position:absolute; right:0; font-size:22px; color:var(--blue); }
details[open] summary::after { content:'−'; }
details p { color:#526077; margin-top:0; }
.related { display:grid; grid-template-columns:repeat(3,1fr); gap:14px; }
.related a { text-decoration:none; background:white; border:1px solid var(--line); border-radius:16px; padding:20px; font-weight:800; transition:.2s ease; }
.related a:hover { transform:translateY(-3px); border-color:#a8c7f4; box-shadow:0 12px 30px rgba(32,63,102,.09); }
.related small { display:block; color:#7b899d; margin-bottom:8px; font-weight:600; }
.cta { margin:60px auto; border-radius:26px; padding:42px; color:white; background:linear-gradient(120deg,#1260d2,#142f58); display:grid; grid-template-columns:1fr auto; align-items:center; gap:30px; box-shadow:var(--shadow); }
.cta h2 { margin:0 0 10px; font-size:34px; }
.cta p { margin:0; color:#d8e8ff; }
.btn-primary { background:#fff; color:#15345f; }
.source-note { padding:18px 0 34px; color:#7a8799; font-size:12px; }
.source-note a { color:#49627f; }
.index-hero { padding:72px 0 44px; max-width:850px; }
.index-grid { display:grid; grid-template-columns:repeat(2,1fr); gap:16px; padding-bottom:70px; }
.index-card { text-decoration:none; border:1px solid var(--line); border-radius:20px; padding:26px; background:white; min-height:190px; display:flex; flex-direction:column; transition:.2s ease; }
.index-card:hover { transform:translateY(-4px); border-color:#aac8f2; box-shadow:0 15px 42px rgba(33,57,91,.09); }
.index-card small { color:var(--blue); text-transform:uppercase; letter-spacing:.09em; font-weight:800; }
.index-card h2 { font-size:24px; margin:14px 0 10px; }
.index-card p { color:#607087; margin:0; }
.index-card span { color:var(--blue); font-weight:800; margin-top:auto; padding-top:18px; }
footer { border-top:1px solid var(--line); padding:30px 0 42px; color:#758398; font-size:13px; }
.footer-inner { width:min(1060px,calc(100% - 36px)); margin:auto; display:flex; justify-content:space-between; gap:20px; }
@media (max-width: 820px) {
  .head-nav { display:none; }
  .site-head { top:8px; }
  .article-hero { grid-template-columns:1fr; padding-top:28px; }
  .hero-visual { transform:none; max-height:330px; }
  h1 { font-size:clamp(32px,10vw,48px); }
  .lead { font-size:18px; }
  .duo,.steps,.feature-grid,.three,.related,.index-grid,.cta { grid-template-columns:1fr; }
  .cta { padding:30px; }
  .cta .btn { justify-self:start; }
}
@media (max-width: 520px) {
  .site-head,.wrap,.footer-inner { width:min(100% - 22px,1060px); }
  .site-head { border-radius:14px; min-height:60px; }
  .brand img { width:32px; height:32px; }
  .head-cta { padding:10px 13px; font-size:13px; }
  .breadcrumbs { padding-top:24px; }
  .article-hero { gap:26px; }
  h1 { font-size:34px; }
  h2 { font-size:28px; }
  .quick { padding:24px 22px; margin-bottom:38px; }
  .section { padding:42px 0; }
  .step,.choice,.feature { padding:20px; }
  .cta { margin:42px auto; border-radius:20px; }
  .cta h2 { font-size:28px; }
  .footer-inner { flex-direction:column; }
}