:root {
  color-scheme: dark;
  --bg: #050608;
  --surface: #0d1014;
  --line: rgba(255, 255, 255, 0.13);
  --text: #f4f6f8;
  --muted: #a9b0ba;
  --accent: #d9ff43;
  --shell: min(1120px, calc(100% - 40px));
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Arial, "Noto Sans KR", sans-serif;
  line-height: 1.75;
}
a { color: inherit; }
.shell { width: var(--shell); margin-inline: auto; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: rgba(5, 6, 8, 0.88);
  backdrop-filter: blur(16px);
}
.header-inner {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand img { display: block; width: 135px; height: auto; }
.header-link { color: var(--muted); text-decoration: none; font-size: 14px; }
.header-link:hover { color: var(--accent); }
.hero {
  min-height: 680px;
  display: grid;
  align-items: center;
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(circle at 78% 28%, rgba(217, 255, 67, 0.12), transparent 28%),
    linear-gradient(135deg, #050608 20%, #10151b 100%);
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.18;
  background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  pointer-events: none;
}
.hero-inner { position: relative; z-index: 1; padding-block: 110px; }
.eyebrow {
  margin: 0 0 22px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
h1 {
  max-width: 920px;
  margin: 0;
  font-size: clamp(42px, 6.5vw, 82px);
  line-height: 1.1;
  letter-spacing: -0.045em;
}
.hero-lead {
  max-width: 760px;
  margin: 30px 0 0;
  color: #cbd0d7;
  font-size: clamp(18px, 2.2vw, 23px);
}
.hero-tags { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 34px; }
.hero-tags span {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 13px;
  color: var(--muted);
  font-size: 13px;
}
.content { padding-block: 100px; }
.article-grid { display: grid; grid-template-columns: minmax(0, 1fr) 310px; gap: 80px; align-items: start; }
.article-body h2 { margin: 70px 0 18px; font-size: clamp(28px, 3vw, 42px); line-height: 1.25; letter-spacing: -0.035em; }
.article-body h2:first-child { margin-top: 0; }
.article-body h3 { margin: 34px 0 10px; font-size: 21px; }
.article-body p { margin: 0 0 20px; color: #c2c8d0; font-size: 17px; }
.article-body strong { color: var(--text); }
.check-list { margin: 26px 0; padding: 0; list-style: none; display: grid; gap: 12px; }
.check-list li { position: relative; padding: 14px 18px 14px 46px; border: 1px solid var(--line); background: var(--surface); }
.check-list li::before { content: "✓"; position: absolute; left: 18px; color: var(--accent); font-weight: 700; }
.side-card { position: sticky; top: 110px; border: 1px solid var(--line); background: var(--surface); padding: 28px; }
.side-card small { color: var(--accent); font-weight: 700; letter-spacing: 0.12em; }
.side-card h2 { margin: 12px 0; font-size: 25px; line-height: 1.35; }
.side-card p { color: var(--muted); font-size: 14px; }
.cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-top: 14px;
  padding: 14px 18px;
  background: var(--accent);
  color: #090b0d;
  font-weight: 800;
  text-decoration: none;
}
.cta:hover { background: #edff8c; }
.bottom-cta { margin-top: 80px; padding: 52px; border: 1px solid var(--line); background: linear-gradient(130deg, #11161d, #090b0e); }
.bottom-cta h2 { margin: 0 0 12px; font-size: clamp(28px, 4vw, 46px); }
.bottom-cta p { color: var(--muted); }
.site-footer { border-top: 1px solid var(--line); padding: 34px 0; color: var(--muted); font-size: 13px; }
.footer-inner { display: flex; justify-content: space-between; gap: 20px; }

@media (max-width: 820px) {
  .article-grid { grid-template-columns: 1fr; gap: 56px; }
  .side-card { position: static; }
  .hero { min-height: 610px; }
  .content { padding-block: 72px; }
  .bottom-cta { padding: 34px 24px; }
  .footer-inner { flex-direction: column; }
}