:root {
  --ink: #e8eef6;
  --muted: #94a6bb;
  --dim: #60758d;
  --bg: #07101b;
  --panel: #0d1b2b;
  --panel-2: #102238;
  --line: rgba(232, 238, 246, .12);
  --cyan: #6bd6e8;
  --gold: #d4b65d;
  --crimson: #b43f55;
  --max: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.7 Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
a { color: inherit; }
.shell { width: min(calc(100% - 40px), var(--max)); min-width: 0; margin-inline: auto; }
.site-header { position: sticky; top: 0; z-index: 10; border-bottom: 1px solid var(--line); background: rgba(7, 16, 27, .84); backdrop-filter: blur(18px); }
.nav { display: flex; align-items: center; justify-content: space-between; min-height: 78px; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 11px; min-width: 0; text-decoration: none; font-weight: 800; letter-spacing: -.03em; }
.brand-logo { width: 34px; height: 34px; padding: 3px; border-radius: 7px; background: #fff; object-fit: contain; box-shadow: 0 0 0 1px rgba(255,255,255,.18), 0 8px 22px rgba(0,0,0,.2); }
.nav-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 20px; color: var(--muted); font-size: 14px; }
.nav-links a { text-decoration: none; }
.nav-links a:hover, .nav-links a:focus-visible { color: var(--ink); }
.eyebrow, .kicker { margin: 0 0 14px; color: var(--cyan); font-size: 12px; font-weight: 800; letter-spacing: .16em; text-transform: uppercase; }
.hero { padding: 82px 0 76px; position: relative; overflow: hidden; background-image: linear-gradient(rgba(255,255,255,.026) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.026) 1px, transparent 1px); background-size: 56px 56px; }
.hero::before { content: ""; position: absolute; width: 520px; height: 520px; right: -240px; top: -160px; background: radial-gradient(circle, rgba(180,63,85,.22), transparent 68%); pointer-events: none; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(280px, .75fr); gap: 72px; align-items: end; }
h1, h2, h3 { margin: 0; font-family: "Plus Jakarta Sans", Inter, sans-serif; letter-spacing: -.04em; line-height: 1.08; }
h1 { max-width: 850px; font-size: clamp(44px, 7vw, 78px); }
h1 span, .accent { color: var(--gold); }
.lede { max-width: 700px; margin: 24px 0 0; color: var(--muted); font-size: clamp(18px, 2vw, 21px); }
.hero-aside { padding: 24px; border: 1px solid var(--line); border-radius: 20px; background: linear-gradient(145deg, rgba(16,34,56,.9), rgba(13,27,43,.7)); }
.hero-aside p { margin: 0; color: var(--muted); font-size: 14px; }
.hero-aside strong { display: block; margin-bottom: 8px; color: var(--ink); font-size: 18px; }
.button-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.button { display: inline-flex; align-items: center; min-height: 44px; padding: 0 17px; border: 1px solid var(--line); border-radius: 999px; text-decoration: none; font-size: 14px; font-weight: 700; }
.button.primary { border-color: transparent; background: linear-gradient(135deg, var(--crimson), #8d233a); color: #fff; }
.button:hover, .button:focus-visible { transform: translateY(-1px); border-color: rgba(212,182,93,.7); }
.section { padding: 72px 0; border-top: 1px solid var(--line); }
.section-heading { display: flex; justify-content: space-between; gap: 28px; align-items: end; margin-bottom: 28px; }
.section-heading h2 { max-width: 680px; font-size: clamp(30px, 5vw, 52px); }
.section-heading p { max-width: 430px; margin: 0; color: var(--muted); font-size: 15px; }
.article-card { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; padding: 28px; position: relative; overflow: hidden; border: 1px solid var(--line); border-radius: 22px; background: var(--panel); text-decoration: none; }
.article-card::before { content: ""; position: absolute; inset: 0 0 auto; height: 2px; background: linear-gradient(90deg, var(--crimson), var(--gold), var(--cyan)); opacity: .9; }
.article-card:hover { border-color: rgba(107,214,232,.45); background: var(--panel-2); }
.article-card h3 { font-size: clamp(24px, 4vw, 38px); }
.article-card p { color: var(--muted); }
.article-meta, .byline, .tag { color: var(--dim); font-size: 13px; }
.tag { display: inline-block; margin-bottom: 14px; color: var(--cyan); font-weight: 800; letter-spacing: .09em; text-transform: uppercase; }
.list { display: grid; gap: 14px; margin: 0; padding: 0; list-style: none; }
.list li { padding: 16px 18px; border-left: 2px solid var(--gold); background: rgba(13,27,43,.7); color: var(--muted); }
.list strong { color: var(--ink); }
.site-footer { padding: 30px 0 46px; border-top: 1px solid var(--line); color: var(--dim); font-size: 13px; }
.footer-row { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 14px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 16px; }
.footer-links a { text-decoration: none; }
.footer-links a:hover { color: var(--ink); }
.article-shell { width: min(calc(100% - 40px), 780px); margin-inline: auto; }
.article-header { padding: 76px 0 46px; background-image: radial-gradient(circle at 86% 6%, rgba(180,63,85,.18), transparent 34%); }
.article-header h1 { max-width: 780px; overflow-wrap: anywhere; font-size: clamp(40px, 6vw, 66px); }
.article-header .lede { font-size: 18px; }
.article-body { padding-bottom: 80px; }
.article-body h2 { margin: 48px 0 16px; font-size: clamp(27px, 4vw, 40px); }
.article-body h3 { margin: 30px 0 10px; font-size: 22px; }
.article-body p, .article-body li { color: #c7d2df; }
.article-body ul, .article-body ol { padding-left: 23px; }
.article-body li + li { margin-top: 8px; }
.callout { margin: 28px 0; padding: 22px 24px; border: 1px solid rgba(107,214,232,.28); border-radius: 16px; background: rgba(107,214,232,.06); }
.callout strong { color: var(--cyan); }
.checklist { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 20px 0 30px; padding: 0; list-style: none; }
.checklist li { padding: 14px 16px; border: 1px solid var(--line); border-radius: 12px; background: rgba(13,27,43,.75); }
.checklist li::before { content: "✓"; margin-right: 9px; color: var(--gold); font-weight: 800; }
code { padding: 2px 5px; border-radius: 5px; background: #12243a; color: #bcebf2; font-size: .92em; }
pre { overflow-x: auto; padding: 20px; border: 1px solid var(--line); border-radius: 14px; background: #050b13; color: #c8f0f4; font: 13px/1.7 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.table-wrap { max-width: 100%; margin: 22px 0 30px; overflow-x: auto; border: 1px solid var(--line); border-radius: 10px; }
table { width: 100%; min-width: 540px; border-collapse: collapse; margin: 0; font-size: 14px; }
th, td { padding: 13px 12px; border: 1px solid var(--line); text-align: left; vertical-align: top; }
th { color: var(--ink); background: var(--panel-2); }
td { color: var(--muted); }
.sources { padding-top: 25px; border-top: 1px solid var(--line); font-size: 14px; }
.sources a { color: var(--cyan); }
.contents { margin: 28px 0 42px; padding: 18px 20px; border: 1px solid var(--line); border-radius: 14px; background: rgba(13,27,43,.68); }
.contents strong { display: block; margin-bottom: 10px; color: var(--ink); }
.contents ol { display: flex; flex-wrap: wrap; gap: 8px 22px; margin: 0; padding-left: 20px; color: var(--muted); }
.contents a { color: var(--cyan); text-decoration: none; }
.model-diagram { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; margin: 28px 0 36px; padding: 18px; border: 1px solid var(--line); border-radius: 16px; background: linear-gradient(135deg, rgba(16,34,56,.9), rgba(13,27,43,.72)); }
.model-step { position: relative; min-height: 92px; padding: 14px 12px; border: 1px solid rgba(107,214,232,.2); border-radius: 12px; background: rgba(7,16,27,.55); }
.model-step:nth-child(-n+4)::after { content: "→"; position: absolute; top: 32px; right: -17px; z-index: 1; color: var(--gold); font-size: 20px; }
.model-step b { display: block; margin-bottom: 5px; color: var(--gold); font-size: 12px; letter-spacing: .08em; text-transform: uppercase; }
.model-step span { display: block; color: var(--muted); font-size: 13px; line-height: 1.45; }
.model-diagram figcaption { grid-column: 1 / -1; margin-top: 2px; color: var(--muted); font-size: 13px; }
.reference-index { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 18px; padding: 0; list-style: none; }
.reference-index li { padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px; background: rgba(13,27,43,.6); }
.reference-index a { color: var(--cyan); text-decoration: none; font-size: 14px; }
.author-card { display: flex; gap: 20px; align-items: flex-start; margin: 34px 0; padding: 22px; border: 1px solid var(--line); border-radius: 18px; background: linear-gradient(135deg, rgba(16,34,56,.92), rgba(13,27,43,.72)); box-shadow: 0 16px 50px rgba(0,0,0,.14); }
.avatar { display: grid; place-items: center; width: 58px; height: 58px; flex: 0 0 58px; overflow: hidden; border: 2px solid var(--gold); border-radius: 50%; background: linear-gradient(135deg, var(--crimson), var(--gold)); color: #fff; font-weight: 900; }
.avatar img { width: 100%; height: 100%; object-fit: cover; object-position: center top; }
.author-card h3 { margin-bottom: 5px; font-size: 19px; letter-spacing: -.02em; }
.author-card > div:last-child { min-width: 0; }
.author-card p { margin: 0; color: var(--muted); font-size: 14px; overflow-wrap: anywhere; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
@media (max-width: 760px) {
  .shell, .article-shell { width: min(calc(100% - 28px), var(--max)); }
  .nav { min-height: 70px; align-items: flex-start; padding: 18px 0; }
  .nav-links { gap: 10px 14px; font-size: 13px; }
  .hero { padding: 58px 0 52px; }
  .hero-grid, .article-card { grid-template-columns: 1fr; gap: 28px; }
  .section { padding: 54px 0; }
  .section-heading { display: block; }
  .section-heading p { margin-top: 14px; }
  .checklist { grid-template-columns: 1fr; }
  .model-diagram { grid-template-columns: 1fr; }
  .model-step:nth-child(-n+4)::after { top: auto; right: auto; bottom: -19px; left: 50%; content: "↓"; }
  .reference-index { grid-template-columns: 1fr; }
  .article-header { padding: 58px 0 34px; }
  .article-header h1 { font-size: clamp(36px, 10vw, 56px); }
  .article-body h2 { margin-top: 38px; }
  .author-card { gap: 14px; }
}
@media (max-width: 540px) {
  .shell, .article-shell { width: min(calc(100% - 24px), var(--max)); }
  .nav { flex-direction: column; gap: 12px; }
  .nav-links { justify-content: flex-start; }
  .hero { padding-top: 46px; }
  h1 { font-size: clamp(36px, 11vw, 58px); }
  .article-header { padding-top: 46px; }
  .article-card, .hero-aside, .callout, .model-diagram, .author-card { padding: 18px; }
  .contents { padding: 16px; }
  .contents ol { display: block; }
  .contents li + li { margin-top: 7px; }
  .model-step { min-height: 78px; }
  .footer-row { display: block; }
  .footer-links { margin-top: 12px; }
}