:root {
  --bg: #0f172a;
  --card: rgba(15, 23, 42, 0.72);
  --card-strong: rgba(30, 41, 59, 0.88);
  --text: #e2e8f0;
  --muted: #94a3b8;
  --line: rgba(148, 163, 184, 0.18);
  --accent: #38bdf8;
  --accent-2: #22c55e;
  --shadow: 0 24px 60px rgba(2, 6, 23, 0.45);
  --max: 1180px;
  --radius: 24px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(56, 189, 248, 0.14), transparent 30%),
    radial-gradient(circle at top right, rgba(34, 197, 94, 0.12), transparent 24%),
    linear-gradient(180deg, #020617 0%, #0f172a 52%, #111827 100%);
  line-height: 1.75;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }
.container { width: min(calc(100% - 32px), var(--max)); margin: 0 auto; }
.header {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: blur(16px);
  background: rgba(2, 6, 23, 0.72);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; padding: 14px 0;
}
.brand { display: flex; align-items: center; gap: 12px; font-weight: 800; letter-spacing: 0.3px; color: #fff; }
.brand-badge {
  width: 42px; height: 42px; display: grid; place-items: center;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #001018; font-weight: 900; box-shadow: var(--shadow);
}
.nav { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.nav a { color: var(--text); font-weight: 600; }
.button {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 10px; min-height: 52px; padding: 0 24px; border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), #0ea5e9);
  color: #001018; font-weight: 800; border: 0; box-shadow: var(--shadow);
  transition: transform .18s ease, box-shadow .18s ease;
}
.button:hover { transform: translateY(-1px); text-decoration: none; }
.button.secondary {
  background: rgba(148, 163, 184, 0.14);
  color: var(--text); border: 1px solid var(--line);
}
.hero { padding: 84px 0 56px; }
.hero-grid {
  display: grid; grid-template-columns: 1.18fr .82fr; gap: 28px; align-items: stretch;
}
.hero-copy, .panel, .article-card, .toc, .faq, .keyword-grid a {
  background: var(--card);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  border-radius: var(--radius);
}
.hero-copy { padding: 34px; }
.eyebrow {
  display: inline-flex; align-items: center; gap: 10px; padding: 8px 14px;
  border-radius: 999px; font-size: 14px; font-weight: 800; letter-spacing: .2px;
  background: rgba(56, 189, 248, 0.12); color: #7dd3fc; border: 1px solid rgba(56, 189, 248, 0.22);
}
.hero h1, .article-card h1 { margin: 18px 0 14px; line-height: 1.08; font-size: clamp(34px, 5vw, 60px); }
.hero p.lead { color: var(--text); font-size: 18px; max-width: 70ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 26px; }
.mini-list { margin: 26px 0 0; padding: 0; list-style: none; display: grid; gap: 12px; }
.mini-list li {
  display: grid; grid-template-columns: 20px 1fr; gap: 12px; align-items: start;
  color: var(--text);
}
.mini-list svg { margin-top: 5px; }
.panel { padding: 28px; }
.panel h2 { margin-top: 0; font-size: 28px; }
.stats { display: grid; gap: 14px; margin-top: 26px; }
.stat {
  padding: 18px; border-radius: 18px; background: var(--card-strong); border: 1px solid var(--line);
}
.stat strong { display: block; font-size: 28px; color: #fff; }
.section { padding: 26px 0 10px; }
.section h2 { font-size: clamp(28px, 3.2vw, 42px); line-height: 1.14; margin-bottom: 12px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 22px; padding: 24px;
  box-shadow: var(--shadow);
}
.card h3 { margin-top: 0; font-size: 22px; }
.card p { color: var(--text); }
.keyword-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 22px;
}
.keyword-grid a {
  padding: 22px; color: var(--text); transition: transform .18s ease, border-color .18s ease;
}
.keyword-grid a:hover { transform: translateY(-3px); text-decoration: none; border-color: rgba(56, 189, 248, 0.42); }
.article-layout { display: grid; grid-template-columns: 290px 1fr; gap: 24px; padding: 42px 0 70px; }
.toc { padding: 22px; position: sticky; top: 92px; align-self: start; }
.toc h2 { margin-top: 0; font-size: 20px; }
.toc ol { margin: 0; padding-left: 18px; display: grid; gap: 12px; }
.article-card { padding: 34px; }
.article-meta { color: var(--muted); font-size: 15px; margin-bottom: 14px; }
.article-card h2 { font-size: 34px; margin-top: 34px; margin-bottom: 12px; line-height: 1.18; }
.article-card h3 { font-size: 24px; margin-top: 22px; margin-bottom: 10px; }
.article-card p { margin: 0 0 16px; color: var(--text); }
.article-card ul { margin: 0 0 18px; padding-left: 22px; }
.callout {
  padding: 22px; border-radius: 18px; background: linear-gradient(135deg, rgba(56, 189, 248, .12), rgba(34, 197, 94, .08));
  border: 1px solid rgba(56, 189, 248, 0.2); margin: 26px 0;
}
.faq { padding: 24px; margin-top: 26px; }
.faq h2 { margin-top: 0; }
.faq-item + .faq-item { border-top: 1px solid var(--line); padding-top: 18px; margin-top: 18px; }
.cta-band { padding: 16px 0 76px; }
.cta-wrap {
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
  padding: 28px; border-radius: 28px; background: linear-gradient(135deg, rgba(56, 189, 248, .18), rgba(34, 197, 94, .13));
  border: 1px solid rgba(125, 211, 252, 0.24); box-shadow: var(--shadow);
}
.footer { border-top: 1px solid var(--line); padding: 28px 0 42px; color: var(--muted); }
.breadcrumbs { color: var(--muted); font-size: 14px; margin-bottom: 16px; }
.tag-row { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0 0; }
.tag {
  padding: 8px 12px; border-radius: 999px; font-size: 14px; font-weight: 700;
  background: rgba(148, 163, 184, 0.12); color: var(--text); border: 1px solid var(--line);
}
@media (max-width: 980px) {
  .hero-grid, .article-layout, .grid-3, .keyword-grid, .cta-wrap { grid-template-columns: 1fr; }
  .toc { position: static; }
  .header-inner { align-items: flex-start; flex-direction: column; }
}
@media (max-width: 640px) {
  .hero { padding-top: 56px; }
  .hero-copy, .panel, .article-card, .toc, .card, .faq, .keyword-grid a { padding: 22px; }
  .button { width: 100%; }
  .hero-actions { flex-direction: column; }
}