:root {
  color-scheme: dark;
  --bg: #070a12;
  --surface: #111827;
  --surface-strong: #17213a;
  --text: #f3f6ff;
  --dim: #a4afca;
  --border: #27324b;
  --accent: #56ffa4;
  --accent-ink: #03140b;
}

* { box-sizing: border-box; }

html {
  min-width: 20rem;
  background: var(--bg);
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  overflow-x: clip;
  color: var(--text);
  background:
    radial-gradient(70rem 38rem at 50% -12rem, color-mix(in srgb, var(--accent) 13%, #18223d), transparent 68%),
    var(--bg);
  font-family: Pretendard, -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo",
    "Noto Sans KR", "Malgun Gothic", sans-serif;
  line-height: 1.65;
}

a { color: inherit; }

.skip-link {
  position: fixed;
  z-index: 10;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.55rem 0.75rem;
  color: var(--accent-ink);
  background: var(--accent);
  border-radius: 0.4rem;
  transform: translateY(-180%);
}

.skip-link:focus { transform: translateY(0); }

.site-header,
.seo-main,
.site-footer {
  width: min(68rem, calc(100% - 2rem));
  margin-inline: auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 4.5rem;
  border-bottom: 1px solid color-mix(in srgb, var(--border) 75%, transparent);
}

.brand {
  color: var(--text);
  font-size: 0.88rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-decoration: none;
}

.site-header nav {
  display: flex;
  gap: 1rem;
  color: var(--dim);
  font-size: 0.82rem;
}

.site-header nav a,
.site-footer a,
.related-links a {
  text-underline-offset: 0.22rem;
}

.seo-main { padding-block: clamp(2.5rem, 7vw, 5.5rem) 5rem; }

.guide-main { max-width: 54rem; }
.guide-hero { max-width: 50rem; padding-block: clamp(1rem, 4vw, 3rem); }
.guide-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.guide-links { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(20rem, 1.08fr);
  align-items: center;
  gap: clamp(2rem, 6vw, 5rem);
  min-height: min(42rem, calc(100vh - 7rem));
}

.hero-copy { max-width: 34rem; }

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

h1 {
  margin-bottom: 1.15rem;
  font-size: clamp(2.75rem, 6vw, 4rem);
  line-height: 0.98;
  letter-spacing: -0.055em;
  word-break: keep-all;
}

h2 {
  margin-bottom: 0.85rem;
  font-size: clamp(1.55rem, 4vw, 2.25rem);
  line-height: 1.2;
  letter-spacing: -0.03em;
}

h3 {
  margin-bottom: 0.45rem;
  font-size: 1.03rem;
}

.lead {
  max-width: 36rem;
  margin-bottom: 1.5rem;
  color: var(--dim);
  font-size: clamp(1rem, 2vw, 1.15rem);
}

.quick-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0 0 1.75rem;
  border-block: 1px solid var(--border);
}

.quick-facts div { padding: 0.9rem 0.8rem 0.9rem 0; }
.quick-facts div + div { padding-left: 0.8rem; border-left: 1px solid var(--border); }
.quick-facts dt { color: var(--dim); font-size: 0.7rem; }
.quick-facts dd { margin: 0.15rem 0 0; font-size: 0.95rem; font-weight: 800; }

.primary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3.25rem;
  padding: 0.8rem 1.35rem;
  color: var(--accent-ink);
  background: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 0.55rem;
  box-shadow: 0 0.7rem 2rem color-mix(in srgb, var(--accent) 18%, transparent);
  font-size: 0.98rem;
  font-weight: 900;
  text-decoration: none;
  transition: transform 150ms ease, box-shadow 150ms ease;
}

.primary-action:hover {
  box-shadow: 0 0.85rem 2.2rem color-mix(in srgb, var(--accent) 25%, transparent);
  transform: translateY(-1px);
}

.primary-action:active { transform: translateY(0); }

.hero-media {
  position: relative;
  margin: 0;
}

.hero-media::before {
  position: absolute;
  inset: 8% -5% -8% 12%;
  z-index: -1;
  background: color-mix(in srgb, var(--accent) 13%, transparent);
  filter: blur(3.5rem);
  content: "";
}

.hero-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 8 / 5;
  object-fit: cover;
  border: 1px solid color-mix(in srgb, var(--accent) 30%, var(--border));
  border-radius: 1rem;
  box-shadow: 0 1.6rem 5rem rgba(0, 0, 0, 0.36);
}

.content-section {
  max-width: 50rem;
  padding-top: clamp(3.5rem, 8vw, 6rem);
}

.content-section > p,
.step-list p,
.detail-grid p,
.faq-list p,
.notice { color: var(--dim); }

.step-list {
  display: grid;
  gap: 0;
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
  counter-reset: steps;
  border-top: 1px solid var(--border);
}

.step-list li {
  position: relative;
  padding: 1.25rem 0 1.25rem 3.25rem;
  border-bottom: 1px solid var(--border);
  counter-increment: steps;
}

.step-list li::before {
  position: absolute;
  top: 1.25rem;
  left: 0;
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 900;
  content: "0" counter(steps);
}

.step-list p { margin-bottom: 0; }

.detail-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.4rem;
}

.detail-grid article {
  padding: 1.25rem;
  background: color-mix(in srgb, var(--surface) 90%, transparent);
  border: 1px solid var(--border);
  border-radius: 0.75rem;
}

.detail-grid p,
.faq-list p { margin-bottom: 0; }

.faq-list { margin-top: 1.4rem; border-top: 1px solid var(--border); }
.faq-list article { padding: 1.25rem 0; border-bottom: 1px solid var(--border); }

.notice {
  margin-top: 1.5rem;
  padding-left: 1rem;
  border-left: 2px solid var(--accent);
  font-size: 0.9rem;
}

.related-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
  margin: 1.25rem 0 0;
  padding: 0;
  list-style: none;
}

.related-links a {
  display: block;
  min-height: 100%;
  padding: 1rem;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0.65rem;
  font-weight: 800;
}

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 1.5rem 2.5rem;
  color: var(--dim);
  border-top: 1px solid var(--border);
  font-size: 0.78rem;
}

.site-footer p { margin: 0; }

:focus-visible { outline: 3px solid color-mix(in srgb, var(--accent) 75%, white); outline-offset: 3px; }

@media (max-width: 48rem) {
  .site-header { align-items: flex-start; flex-direction: column; justify-content: center; gap: 0.3rem; }
  .site-header nav { gap: 0.8rem; }
  .hero { grid-template-columns: 1fr; min-height: auto; }
  .hero-copy { max-width: none; }
  .hero-media { grid-row: 2; }
  .quick-facts { grid-template-columns: 1fr; }
  .quick-facts div { padding: 0.75rem 0; }
  .quick-facts div + div { padding-left: 0; border-top: 1px solid var(--border); border-left: 0; }
  .detail-grid,
  .related-links { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .primary-action { transition: none; }
}