/* Reset & base */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: #1a1a1e;
  color: #f0f0f0;
  line-height: 1.6;
  min-height: 100vh;
}

/* Header */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.75rem 1.25rem;
  background-color: #25252a;
  border-bottom: 1px solid #3a3a40;
}

.nav {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.nav-link {
  color: #c0c0c8;
  text-decoration: none;
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  transition: color 0.2s, background-color 0.2s;
}

.nav-link:hover {
  color: #fff;
  background-color: #3a3a40;
}

.nav-link.active {
  color: #fff;
  font-weight: 600;
}

/* Language switcher */
.lang-switcher {
  display: flex;
  gap: 0.25rem;
}

.lang-btn {
  padding: 0.4rem 0.75rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: #888;
  background-color: transparent;
  border: 1px solid #444;
  border-radius: 6px;
  cursor: pointer;
  transition: color 0.2s, background-color 0.2s, border-color 0.2s;
}

.lang-btn:hover {
  color: #ccc;
  border-color: #666;
}

.lang-btn.active {
  color: #fff;
  background-color: #3d7ea6;
  border-color: #3d7ea6;
}

/* Main content */
.main {
  max-width: 720px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem 3rem;
}

.content {
  outline: none;
}

.content.lang-block[hidden] {
  display: none !important;
}

.app-name {
  font-size: 2.5rem;
  font-weight: 900;
  margin: 0 0 0.5rem;
  color: #fff;
  letter-spacing: -0.02em;
}

.doc-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin: 0 0 1.25rem;
  color: #fff;
}

.updated {
  font-size: 0.9rem;
  color: #999;
  margin-bottom: 0.5rem;
}

h1 {
  font-size: 1.75rem;
  font-weight: 700;
  margin: 0 0 1.25rem;
  color: #fff;
}

h2, h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 1.75rem 0 0.75rem;
  color: #e8e8ec;
}

p {
  margin: 0 0 1rem;
}

ul, ol {
  margin: 0 0 1rem;
  padding-left: 1.5rem;
}

ul li, ol li {
  margin-bottom: 0.35rem;
}

ol.nested {
  list-style-type: decimal;
  padding-left: 1.75rem;
}

a {
  color: #6eb3e0;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Responsive */
@media (max-width: 480px) {
  html {
    font-size: 15px;
  }

  .header {
    padding: 0.6rem 1rem;
  }

  .main {
    padding: 1rem 1rem 2.5rem;
  }

  h1 {
    font-size: 1.5rem;
  }

  h2 {
    font-size: 1.1rem;
  }
}