@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@300;400;500;700&display=swap');

:root {
  --primary-color: #2563eb;
  --bg-color: #f8fafc;
  --container-bg: #ffffff;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --link-color: #3b82f6;
  --link-hover: #1d4ed8;
}

@media (prefers-color-scheme: dark) {
  :root {
    --primary-color: #3b82f6;
    --bg-color: #0f172a;
    --container-bg: #1e293b;
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --link-color: #60a5fa;
    --link-hover: #93c5fd;
  }
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  line-height: 1.6;
  padding: 2rem 1rem;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  background-color: var(--container-bg);
  padding: 3rem;
  border-radius: 16px;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.01);
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

header {
  margin-bottom: 2.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
}

h1 {
  font-size: 2.2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--primary-color);
  letter-spacing: -0.025em;
}

.subtitle {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.content {
  font-size: 1rem;
}

.content h2 {
  font-size: 1.4rem;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  color: var(--text-main);
  font-weight: 700;
  border-left: 4px solid var(--primary-color);
  padding-left: 0.75rem;
}

.content h3 {
  font-size: 1.1rem;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  color: var(--text-main);
  font-weight: 500;
}

.content p {
  margin-bottom: 1.25rem;
  color: var(--text-main);
  word-break: keep-all;
}

.content ul {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
  color: var(--text-main);
}

.content li {
  margin-bottom: 0.5rem;
}

.version-history {
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 2px dashed var(--border-color);
  background-color: rgba(0,0,0,0.02);
  padding: 2rem;
  border-radius: 12px;
}
@media (prefers-color-scheme: dark) {
  .version-history {
    background-color: rgba(255,255,255,0.02);
  }
}

.version-history h3 {
  font-size: 1.2rem;
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.version-list {
  list-style: none;
  padding-left: 0;
}

.version-list li {
  margin-bottom: 0.75rem;
}

a {
  color: var(--link-color);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2rem;
  font-size: 0.95rem;
  justify-content: center;
}

.nav-links a {
  padding: 0.6rem 1.2rem;
  background-color: var(--border-color);
  border-radius: 20px;
  color: var(--text-main);
  font-weight: 500;
  transition: all 0.2s ease;
}

.nav-links a:hover {
  background-color: var(--primary-color);
  color: #fff;
  text-decoration: none;
  transform: translateY(-1px);
}

.nav-links a.active {
  background-color: var(--primary-color);
  color: #fff;
  box-shadow: 0 4px 6px -1px rgba(37, 99, 235, 0.2);
}

@media (max-width: 600px) {
  body {
    padding: 1rem 0.5rem;
  }
  .container {
    padding: 1.5rem;
    border-radius: 12px;
  }
  h1 {
    font-size: 1.7rem;
  }
}