:root {
  --bg: #f3f4f8;
  --panel: #ffffff;
  --line: rgba(18, 24, 38, 0.10);
  --text: #1f2430;
  --muted: #5f6b87;
  --cyan: #2f6f8f;
  --purple: #6f5fa8;
  --pink: #b94c87;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Pretendard", sans-serif;
  color: var(--text);
  background: var(--bg);
}

.background {
  position: fixed;
  inset: 0;
  background: #eef1f5;
  z-index: 0;
}

.shell {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 2rem;
}

.card {
  width: min(960px, 100%);
  padding: 2rem;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--panel);
  box-shadow: 0 2px 8px rgba(31, 36, 48, 0.04);
}

.hero {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.eyebrow {
  margin: 0 0 0.45rem;
  color: var(--cyan);
  font-size: 0.78rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  font-weight: 700;
}

h1 {
  margin: 0;
  font-family: "D2Coding", "Elice Digital BAEUM", "Elice Digital Coding", "Nanum Gothic Coding", "Courier New", monospace;
  font-size: clamp(1.9rem, 3vw, 2.6rem);
  line-height: 1.1;
}

.page-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: 0.9rem;
  padding: 0.7rem 0.85rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 2px;
  background: #ffffff;
  box-shadow: none;
}

.page-nav a {
  text-decoration: none;
  color: var(--muted);
  padding: 0.2rem 0.15rem;
  font-family: "Pretendard", sans-serif;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

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

.page-nav a.active {
  color: var(--cyan);
  font-weight: 700;
}

.content {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 1.5rem;
  align-items: start;
}

.content img {
  width: 100%;
  border-radius: 2px;
  border: 1px solid rgba(31,36,48,0.08);
  box-shadow: 0 2px 6px rgba(31,36,48,0.04);
}

.content p {
  color: var(--text);
  line-height: 1.85;
  margin: 0 0 1rem;
}

.content ul {
  list-style: none;
  padding-left: 1rem;
  margin: 0 0 1rem;
}

.content li {
  position: relative;
  margin: 0.55rem 0;
  padding-left: 0.25rem;
  color: var(--text);
  line-height: 1.75;
}

.content li::before {
  content: "•";
  position: absolute;
  left: -0.9rem;
  top: 0;
  color: #3b82f6;
  font-weight: 700;
  line-height: 1.75;
}

.quick-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1rem;
}

.quick-links a {
  display: inline-flex;
  align-items: center;
  padding: 0.55rem 0.85rem;
  border-radius: 2px;
  border: 1px solid rgba(255,255,255,0.12);
  color: var(--cyan);
  text-decoration: none;
  background: #ffffff;
}

.quick-links a:hover {
  color: var(--pink);
  border-color: rgba(255,121,198,0.35);
}

.content a {
  color: var(--cyan);
  text-decoration: none;
}

.content a:hover {
  color: var(--pink);
}

@media (max-width: 760px) {
  .card { padding: 1.2rem; }
  .hero { flex-direction: column; align-items: flex-start; }
  .content { grid-template-columns: 1fr; }
  .content img { max-width: 220px; }
}