:root {
  --brand-blue: #252d8f;
  --brand-blue-dark: #09133f;
  --brand-blue-deep: #050b25;
  --ink: #0c163c;
  --muted: #53617f;
  --paper: #ffffff;
  --paper-soft: #f4f7ff;
  --line: #dbe4f7;
  --accent: #7b2cff;
  --accent-2: #b646ff;
  --cyan: #12d7ff;
  --shadow: 0 24px 70px rgba(7, 19, 61, .16);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 88% 8%, rgba(123, 44, 255, .2), transparent 30rem),
    radial-gradient(circle at 10% 0%, rgba(37, 45, 143, .14), transparent 24rem),
    linear-gradient(180deg, #f8fbff 0%, #eef4ff 50%, #f8fbff 100%);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  line-height: 1.65;
}
a { color: inherit; }
.shell { width: min(1180px, calc(100% - 42px)); margin: 0 auto; }

.topbar { position: sticky; top: 0; z-index: 20; background: rgba(255,255,255,.9); border-bottom: 1px solid rgba(219,228,247,.9); backdrop-filter: blur(16px); }
.nav { min-height: 82px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand img { display: block; width: 270px; max-width: 58vw; height: auto; }
.nav-links { display: flex; align-items: center; gap: 18px; color: var(--brand-blue-dark); font-size: .92rem; font-weight: 800; }
.nav-links a { text-decoration: none; opacity: .86; white-space: nowrap; }
.nav-links a:hover { color: var(--brand-blue); opacity: 1; }
.nav-menu { position: relative; display: inline-flex; align-items: center; }
.nav-menu > a { display: inline-flex; align-items: center; gap: 6px; }
.nav-menu > a::after { content: "▾"; font-size: .72rem; line-height: 1; opacity: .7; }
.nav-dropdown { position: absolute; top: calc(100% + 14px); right: 0; min-width: 285px; display: grid; gap: 4px; padding: 10px; border: 1px solid rgba(219,228,247,.95); border-radius: 18px; background: rgba(255,255,255,.96); box-shadow: 0 18px 44px rgba(7,19,61,.16); backdrop-filter: blur(14px); opacity: 0; visibility: hidden; transform: translateY(8px); transition: opacity .18s ease, transform .18s ease, visibility .18s ease; }
.nav-menu:hover .nav-dropdown, .nav-menu:focus-within .nav-dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
.nav-dropdown a { display: block; padding: 10px 12px; border-radius: 12px; color: var(--brand-blue-dark); font-weight: 850; }
.nav-dropdown a:hover { background: var(--paper-soft); color: var(--brand-blue); }
.mobile-menu-toggle { display: none; align-items: center; gap: 8px; padding: 9px 12px; border: 1px solid var(--line); border-radius: 10px; color: var(--brand-blue-dark); background: #fff; font: inherit; font-weight: 800; }
.menu-icon { display: grid; gap: 4px; }
.menu-icon span { width: 18px; height: 2px; background: currentColor; }

.article-hero { position: relative; overflow: hidden; color: #fff; background: radial-gradient(circle at 82% 14%, rgba(18,215,255,.24), transparent 22rem), radial-gradient(circle at 66% 10%, rgba(182,70,255,.28), transparent 22rem), linear-gradient(135deg, var(--brand-blue-deep), #0b2b66 55%, #112e7d); }
.article-hero::before { content: ""; position: absolute; inset: 0; opacity: .36; background-image: linear-gradient(rgba(255,255,255,.06) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.06) 1px, transparent 1px); background-size: 42px 42px; mask-image: radial-gradient(circle at 75% 20%, #000, transparent 58%); }
.article-hero-inner { position: relative; z-index: 1; padding: 70px 0 76px; }
.back-link { display: inline-flex; align-items: center; gap: 8px; margin-bottom: 32px; color: rgba(255,255,255,.76); font-size: .9rem; font-weight: 850; text-decoration: none; }
.back-link:hover { color: #fff; text-decoration: underline; text-underline-offset: 4px; }
.article-category { display: inline-flex; align-items: center; gap: 9px; color: #a7efff; font-size: .78rem; font-weight: 950; letter-spacing: .12em; text-transform: uppercase; }
.article-category::before { content: ""; width: 9px; height: 9px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 14px rgba(18,215,255,.8); }
h1 { max-width: 960px; margin: 18px 0 20px; font-size: clamp(2.8rem, 6vw, 5.9rem); line-height: .96; letter-spacing: -.075em; }
.article-dek { max-width: 760px; margin: 0; color: rgba(255,255,255,.84); font-size: clamp(1.08rem, 2vw, 1.35rem); }
.article-meta { display: flex; flex-wrap: wrap; gap: 9px 18px; margin-top: 26px; color: rgba(255,255,255,.66); font-size: .9rem; font-weight: 750; }
.article-meta span + span::before { content: "•"; margin-right: 18px; color: var(--cyan); }
.tag-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 25px; }
.tag { padding: 6px 10px; border: 1px solid rgba(167,239,255,.35); border-radius: 999px; color: #d9f8ff; background: rgba(255,255,255,.08); font-size: .78rem; font-weight: 800; }

main { padding: 66px 0 88px; }
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 34px; align-items: start; }
.article-body { padding: clamp(28px, 5vw, 58px); border: 1px solid var(--line); border-radius: 28px; background: #fff; box-shadow: var(--shadow); }
.article-body > :first-child { margin-top: 0; }
.article-body p { margin: 0 0 20px; color: #2c3a5d; font-size: 1.08rem; }
.article-body h2 { margin: 42px 0 14px; color: var(--brand-blue-dark); font-size: clamp(1.65rem, 3vw, 2.35rem); line-height: 1.08; letter-spacing: -.05em; }
.article-body h3 { margin: 30px 0 10px; color: var(--brand-blue-dark); font-size: 1.3rem; line-height: 1.15; letter-spacing: -.035em; }
.article-body ul, .article-body ol { display: grid; gap: 10px; margin: 18px 0 24px; padding-left: 24px; color: #2c3a5d; font-size: 1.03rem; }
.article-body li::marker { color: var(--accent); font-weight: 900; }
.article-body blockquote { margin: 30px 0; padding: 20px 24px; border-left: 4px solid var(--accent); border-radius: 0 16px 16px 0; color: var(--brand-blue-dark); background: var(--paper-soft); font-size: 1.22rem; font-weight: 800; line-height: 1.4; }
.article-note { margin-top: 38px; padding-top: 22px; border-top: 1px solid var(--line); color: var(--muted); font-size: .9rem; font-weight: 650; }
.article-aside { position: sticky; top: 106px; display: grid; gap: 18px; }
.aside-card { padding: 25px; border: 1px solid var(--line); border-radius: 22px; background: rgba(255,255,255,.86); box-shadow: 0 18px 46px rgba(7,19,61,.09); }
.aside-card h2 { margin: 0 0 13px; color: var(--brand-blue-dark); font-size: 1.25rem; line-height: 1.08; letter-spacing: -.04em; }
.aside-card p { margin: 0; color: var(--muted); font-size: .94rem; font-weight: 650; }
.aside-card ul { display: grid; gap: 10px; margin: 16px 0 0; padding: 0; list-style: none; }
.aside-card li { position: relative; padding-left: 18px; color: var(--brand-blue-dark); font-size: .9rem; font-weight: 800; }
.aside-card li::before { content: "→"; position: absolute; left: 0; color: var(--accent); }
.aside-card.cta { color: #fff; background: linear-gradient(140deg, #0a1748, #252d8f 60%, #7b2cff); }
.aside-card.cta h2, .aside-card.cta p { color: #fff; }
.aside-card.cta p { color: rgba(255,255,255,.78); }
.cta-link { display: inline-flex; margin-top: 18px; padding: 11px 15px; border: 1px solid rgba(255,255,255,.3); border-radius: 12px; color: #fff; background: rgba(255,255,255,.1); font-weight: 900; text-decoration: none; }
.cta-link:hover { background: rgba(255,255,255,.18); }

footer { padding: 32px 0; color: #fff; background: var(--brand-blue-deep); }
.footer-grid { display: grid; grid-template-columns: 1fr auto 1fr; gap: 18px; align-items: center; }
.footer-logo img { display: block; width: 270px; max-width: 100%; }
.footer-email { text-align: center; font-weight: 900; }
.footer-email a { color: #fff; text-decoration: underline; text-underline-offset: 4px; }
.footer-right { text-align: right; color: rgba(255,255,255,.72); font-size: .92rem; font-weight: 650; }

@media (max-width: 980px) {
  .mobile-menu-toggle { display: inline-flex; }
  .nav-links { position: absolute; top: 100%; left: 0; right: 0; display: none; flex-direction: column; align-items: stretch; gap: 3px; padding: 14px; border: 1px solid var(--line); border-top: 0; border-radius: 0 0 20px 20px; background: rgba(255,255,255,.99); box-shadow: 0 22px 50px rgba(7,19,61,.2); }
  .nav-links.is-open { display: flex; }
  .nav-links > a, .nav-menu > a, .nav-dropdown a { display: block; width: 100%; padding: 12px 13px; border-radius: 12px; white-space: normal; }
  .nav-menu { display: block; width: 100%; }
  .nav-menu > a::after { display: none; }
  .nav-dropdown { position: static; display: grid; min-width: 0; margin: 2px 0 4px 12px; padding: 3px 0 3px 10px; border: 0; border-left: 2px solid var(--line); border-radius: 0; background: transparent; box-shadow: none; opacity: 1; visibility: visible; transform: none; }
  .nav-dropdown a { padding: 10px 12px; font-size: .88rem; }
  .article-layout { grid-template-columns: 1fr; }
  .article-aside { position: static; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: 1fr; text-align: center; }
  .footer-logo img { margin: 0 auto; }
  .footer-right { text-align: center; }
}
@media (max-width: 620px) {
  .shell { width: min(100% - 26px, 1180px); }
  .brand img { width: 245px; }
  .article-hero-inner { padding: 54px 0 58px; }
  h1 { font-size: clamp(2.65rem, 14vw, 4.4rem); }
  main { padding: 48px 0 66px; }
  .article-body { padding: 25px; border-radius: 21px; }
  .article-aside { grid-template-columns: 1fr; }
}