:root {
  --ink: #f8fff9;
  --muted: rgba(235, 255, 250, 0.72);
  --subtle: rgba(191, 242, 220, 0.55);
  --panel: rgba(5, 30, 38, 0.82);
  --line: rgba(191, 242, 220, 0.18);
  --lime: #b9ee55;
  --water: #0e7f91;
  --deep: #02141d;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at 50% 0%, rgba(25, 116, 128, 0.28), transparent 52%),
    linear-gradient(180deg, #063244, var(--deep));
  color: var(--ink);
  font-family: "Pretendard", "Noto Sans KR", "Apple SD Gothic Neo", system-ui, -apple-system, sans-serif;
  line-height: 1.65;
}

a { color: var(--lime); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: #d8ff8f; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: rgba(3, 27, 36, 0.82);
  backdrop-filter: blur(10px);
}

.site-header-inner,
.site-footer-inner,
.page {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 20px;
}

.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 58px;
}

.brand {
  color: var(--ink);
  font-weight: 800;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.nav {
  display: flex;
  gap: 14px;
  font-size: 13px;
}

.nav a {
  color: var(--muted);
  text-decoration: none;
}

.nav a:hover { color: var(--ink); }

.page { padding: 48px 20px 72px; }

.eyeline {
  margin: 0 0 8px;
  color: var(--lime);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1 {
  margin: 0 0 12px;
  font-size: clamp(28px, 5vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.03em;
}

.lead { color: var(--muted); font-size: 17px; }

.card {
  margin-top: 28px;
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel);
}

.card h2, .card h3 { margin: 0 0 10px; font-size: 18px; }
.card p, .card li, .card dd, .card dt { color: var(--muted); }

.feature-grid {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.feature-grid article {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(4, 24, 31, 0.55);
}

.feature-grid h3 { margin: 0 0 6px; font-size: 16px; }
.feature-grid p { margin: 0; color: var(--muted); font-size: 15px; }

.legal section + section { margin-top: 28px; }
.legal h2 { margin: 0 0 8px; font-size: 18px; }
.legal p { margin: 0 0 8px; color: var(--muted); }

.faq details {
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.faq summary {
  cursor: pointer;
  font-weight: 700;
  list-style: none;
}

.faq summary::-webkit-details-marker { display: none; }
.faq p { margin: 10px 0 0; color: var(--muted); }

.site-footer {
  border-top: 1px solid var(--line);
  padding: 28px 0 36px;
  color: var(--subtle);
  font-size: 13px;
}

.site-footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  justify-content: space-between;
}

.site-footer a { color: var(--subtle); text-decoration: none; }
.site-footer a:hover { color: var(--ink); }

@media (min-width: 720px) {
  .feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}