:root {
  --accent: #007aff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --bg: #f5f5f7;
  --card: #ffffff;
  --line: rgba(0,0,0,0.08);
  --radius: 22px;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.6;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

a:focus-visible {
  outline: 3px solid rgba(0, 122, 255, 0.35);
  outline-offset: 4px;
  border-radius: 10px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: rgba(245, 245, 247, 0.92);
  backdrop-filter: saturate(180%) blur(18px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  width: min(100% - 32px, 980px);
  margin: 0 auto;
  padding: 14px 0;
}

.brand {
  color: var(--text);
  font-weight: 700;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 0.95rem;
}

.nav-links a {
  color: var(--muted);
}

.nav-links a[aria-current="page"],
.brand[aria-current="page"] {
  color: var(--text);
}

.page {
  width: min(100% - 32px, 980px);
  margin: 0 auto;
  padding: 64px 0 48px;
}

.hero,
.page-title {
  max-width: 760px;
  margin-bottom: 40px;
}

.app-icon {
  display: block;
  width: 96px;
  height: 96px;
  margin-bottom: 24px;
  border-radius: 24px;
  border: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 16px;
  font-size: 4.75rem;
  line-height: 0.98;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 12px;
  font-size: 1.45rem;
  line-height: 1.2;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 8px;
  font-size: 1.08rem;
  line-height: 1.3;
  letter-spacing: 0;
}

.subtitle {
  max-width: 680px;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 1.75rem;
  line-height: 1.25;
}

.subtitle.ko {
  font-size: 1.35rem;
}

.updated {
  color: var(--muted);
}

.card-grid,
.link-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.card,
.content-card,
.link-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
}

.card,
.content-card {
  padding: 28px;
}

.card p:last-child,
.content-card p:last-child,
.qa p:last-child {
  margin-bottom: 0;
}

.quick-links {
  margin-top: 40px;
}

.link-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 82px;
  padding: 22px 24px;
  color: var(--text);
  font-weight: 700;
}

.link-card:hover {
  border-color: rgba(0, 122, 255, 0.35);
  text-decoration: none;
}

.policy-page {
  max-width: 900px;
}

.content-card {
  margin-bottom: 20px;
}

.content-card h2:not(:first-child),
.content-card h3:not(:first-child) {
  margin-top: 30px;
}

ul {
  padding-left: 1.35rem;
}

li + li {
  margin-top: 6px;
}

.faq {
  display: grid;
  gap: 24px;
}

.qa {
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.qa:first-of-type {
  padding-top: 0;
  border-top: 0;
}

.site-footer {
  width: min(100% - 32px, 980px);
  margin: 0 auto;
  padding: 28px 0 40px;
  color: var(--muted);
  font-size: 0.95rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}

@media (max-width: 720px) {
  body {
    font-size: 16px;
  }

  .nav {
    width: min(100% - 24px, 980px);
  }

  .nav-links {
    gap: 14px;
  }

  .page {
    width: min(100% - 24px, 980px);
    padding-top: 42px;
  }

  h1 {
    font-size: 3.1rem;
  }

  .subtitle {
    font-size: 1.35rem;
  }

  .subtitle.ko {
    font-size: 1.15rem;
  }

  .card-grid,
  .link-cards {
    grid-template-columns: 1fr;
  }

  .card,
  .content-card {
    padding: 22px;
  }

  .site-footer {
    width: min(100% - 24px, 980px);
  }
}