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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: #1a1a2e;
  background: #fff;
  line-height: 1.6;
}

a {
  color: #2563eb;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Language nav */
.lang-nav {
  background: #1a1a2e;
  padding: 0.4rem 0;
  font-size: 0.8rem;
}

.lang-nav a {
  color: #9ca3af;
  margin-right: 0.75rem;
  text-decoration: none;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.lang-nav a:hover {
  color: #fff;
  text-decoration: none;
}

/* Header */
.site-header {
  background: #f9fafb;
  border-bottom: 1px solid #e5e7eb;
  padding: 3rem 0 2.5rem;
}

.site-header h1 {
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.site-header .subtitle {
  font-size: 1.125rem;
  color: #4b5563;
  max-width: 600px;
  margin-bottom: 1.25rem;
}

.header-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  font-size: 0.875rem;
}

.header-meta .badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 3px;
  font-weight: 600;
  font-size: 0.8rem;
  background: #e5e7eb;
  color: #1a1a2e;
}

.header-meta a {
  font-weight: 500;
}

/* Sections */
section {
  padding: 2.5rem 0;
  border-bottom: 1px solid #e5e7eb;
}

section:last-of-type {
  border-bottom: none;
}

section h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: -0.01em;
}

section h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

section p {
  margin-bottom: 1rem;
}

section p:last-child {
  margin-bottom: 0;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.9rem;
}

th,
td {
  text-align: left;
  padding: 0.6rem 0.75rem;
  border: 1px solid #e5e7eb;
}

th {
  font-weight: 600;
  background: #f9fafb;
}

/* Code blocks */
pre {
  background: #f3f4f6;
  border: 1px solid #e5e7eb;
  border-radius: 4px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.5;
  margin: 1rem 0;
}

code {
  font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
}

p code,
li code,
td code {
  background: #f3f4f6;
  padding: 0.15rem 0.35rem;
  border-radius: 3px;
  font-size: 0.85em;
}

/* Code block with copy button */
.code-block {
  position: relative;
}

.code-block .copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: #e5e7eb;
  border: none;
  border-radius: 3px;
  padding: 0.3rem 0.6rem;
  font-size: 0.75rem;
  font-family: inherit;
  cursor: pointer;
  color: #1a1a2e;
}

.code-block .copy-btn:hover {
  background: #d1d5db;
}

/* Conformance levels */
.levels {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 1rem 0;
}

.level-card {
  border: 1px solid #e5e7eb;
  border-radius: 4px;
  padding: 1.25rem;
}

.level-card h3 {
  margin-bottom: 0.75rem;
}

.level-card .effort {
  font-size: 0.85rem;
  color: #6b7280;
  margin-bottom: 0.5rem;
}

/* Feature groups */
.feature-groups {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin: 1rem 0;
}

.feature-group {
  border: 1px solid #e5e7eb;
  border-radius: 4px;
  padding: 1rem;
}

.feature-group h3 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.feature-group ul {
  list-style: none;
  padding: 0;
}

.feature-group li {
  font-size: 0.9rem;
  padding: 0.2rem 0;
}

/* Resources list */
.resources-list {
  list-style: none;
  padding: 0;
}

.resources-list li {
  padding: 0.4rem 0;
  font-size: 0.95rem;
}

/* Footer */
.site-footer {
  padding: 2rem 0;
  border-top: 1px solid #e5e7eb;
  font-size: 0.85rem;
  color: #6b7280;
  text-align: center;
}

.site-footer p {
  margin-bottom: 0.3rem;
}

/* Responsive */
@media (max-width: 768px) {
  .site-header h1 {
    font-size: 1.75rem;
  }

  .levels {
    grid-template-columns: 1fr;
  }

  .feature-groups {
    grid-template-columns: 1fr;
  }

  table {
    font-size: 0.8rem;
  }

  th,
  td {
    padding: 0.4rem 0.5rem;
  }
}