@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Sans+KR:wght@400;500;600;700&family=JetBrains+Mono:wght@400;600&display=swap");

:root {
  --bg: #08131f;
  --panel: rgba(12, 28, 42, 0.9);
  --line: rgba(120, 214, 198, 0.22);
  --text: #eef4f6;
  --muted: #9cb7bf;
  --mint: #78d6c6;
  --amber: #ffc46b;
  --sky: #8fc7ff;
  --shadow: 0 22px 50px rgba(0, 0, 0, 0.32);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: "IBM Plex Sans KR", "Noto Sans KR", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(120, 214, 198, 0.14), transparent 32%),
    linear-gradient(135deg, #07101a 0%, #0a2030 52%, #101c18 100%);
}

.doc-shell {
  width: min(940px, calc(100vw - 28px));
  margin: 0 auto;
  padding: 28px 0 60px;
}

.doc-nav,
.doc-panel {
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
  background: linear-gradient(180deg, rgba(18, 35, 52, 0.8), rgba(7, 17, 27, 0.92));
  backdrop-filter: blur(16px);
}

.doc-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
}

.doc-nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.doc-nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  padding: 10px 14px;
  color: var(--text);
  text-decoration: none;
  background: rgba(255, 255, 255, 0.05);
}

.doc-panel {
  margin-top: 18px;
  padding: 28px;
}

.eyebrow {
  margin: 0;
  color: var(--mint);
  font-size: 0.82rem;
  font-family: "JetBrains Mono", monospace;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.15;
}

h1 {
  margin-top: 12px;
  font-size: clamp(2rem, 5vw, 3.4rem);
}

h2 {
  margin-top: 30px;
  font-size: 1.55rem;
}

h3 {
  margin-top: 22px;
  font-size: 1.08rem;
}

p,
li {
  color: var(--muted);
  line-height: 1.8;
}

a {
  color: var(--sky);
}

a:hover {
  color: var(--mint);
}

ul,
ol {
  padding-left: 22px;
}

li::marker {
  color: var(--amber);
}

.lead {
  margin-top: 14px;
}

.doc-grid {
  display: grid;
  gap: 16px;
  margin-top: 18px;
}

.doc-card {
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 18px;
  padding: 18px;
  background: rgba(255, 255, 255, 0.04);
}

.doc-card h3 {
  margin-top: 0;
}

.quote {
  margin-top: 16px;
  border-left: 3px solid var(--mint);
  padding-left: 14px;
  color: var(--text);
}

code {
  font-family: "JetBrains Mono", monospace;
  color: var(--sky);
}

@media (max-width: 760px) {
  .doc-shell {
    width: min(100vw - 16px, 100%);
    padding-top: 16px;
  }

  .doc-nav,
  .doc-panel {
    border-radius: 20px;
    padding: 20px;
  }
}