:root {
  color-scheme: light;
  --text: #0d0d0d;
  --muted: #5d5d5d;
  --border: #e8e8e8;
  --link: #0d0d0d;
  --bg: #ffffff;
  --surface: #f7f7f7;
  --max-width: 42rem;
  --page-padding: 1rem;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0.08);
}

.page {
  max-width: var(--max-width);
  margin: 0 auto;
  padding:
    calc(1.25rem + var(--safe-top))
    calc(var(--page-padding) + var(--safe-right))
    calc(2rem + var(--safe-bottom))
    calc(var(--page-padding) + var(--safe-left));
}

h1 {
  font-size: clamp(1.75rem, 6vw, 2.5rem);
  line-height: 1.15;
  font-weight: 600;
  margin: 0 0 1.5rem;
  letter-spacing: -0.02em;
  overflow-wrap: anywhere;
}

h2 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.doc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  border-top: 1px solid var(--border);
}

.doc-item {
  border-bottom: 1px solid var(--border);
}

.doc-item__link {
  display: block;
  padding: 1rem 0.25rem;
  color: inherit;
  text-decoration: none;
  transition: background-color 0.15s ease;
}

.doc-item__link:active {
  background: var(--surface);
}

.doc-item__title {
  display: block;
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.35;
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 0.18em;
  overflow-wrap: anywhere;
}

.doc-item__summary {
  display: block;
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.45;
}

.doc-summary {
  color: var(--muted);
}

.doc-header {
  position: sticky;
  top: 0;
  z-index: 10;
  margin: calc(-1 * var(--safe-top)) calc(-1 * var(--page-padding)) 1.5rem;
  padding:
    calc(0.75rem + var(--safe-top))
    calc(var(--page-padding) + var(--safe-right))
    0.75rem
    calc(var(--page-padding) + var(--safe-left));
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.doc-back {
  display: inline-flex;
  align-items: center;
  min-height: 2.75rem;
  padding: 0.35rem 0;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
}

.doc-back:active {
  color: var(--text);
}

.doc-title {
  margin: 0.25rem 0 0;
  font-size: clamp(1.35rem, 5vw, 1.9rem);
  line-height: 1.25;
  letter-spacing: -0.02em;
  overflow-wrap: anywhere;
}

.doc-content {
  font-size: 1rem;
  line-height: 1.65;
  overflow-wrap: anywhere;
  word-break: break-word;
  font-family: inherit;
  color: inherit;
}

.doc-content h1,
.doc-content h2,
.doc-content h3,
.doc-content h4 {
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
  line-height: 1.3;
  overflow-wrap: anywhere;
}

.doc-content h1 { font-size: 1.5rem; }
.doc-content h2 { font-size: 1.25rem; }
.doc-content h3 { font-size: 1.1rem; }

.doc-content p,
.doc-content ul,
.doc-content ol,
.doc-content blockquote {
  margin: 0 0 1rem;
}

.doc-content li {
  margin-bottom: 0.35rem;
}

.doc-content a {
  color: var(--link);
  text-underline-offset: 0.15em;
}

.doc-content img,
.doc-content video,
.doc-content iframe {
  display: block;
  max-width: 100%;
  height: auto;
}

.doc-content table {
  display: block;
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-collapse: collapse;
  margin: 0 0 1rem;
}

.doc-content th,
.doc-content td {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  text-align: left;
  vertical-align: top;
  min-width: 6rem;
}

.doc-content pre,
.doc-content code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9em;
}

.doc-content pre {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  padding: 0.75rem 1rem;
  background: var(--surface);
  border-radius: 0.5rem;
}

.doc-meta {
  margin-top: 0.35rem;
  color: var(--muted);
  font-size: 0.875rem;
}

@media (hover: hover) and (pointer: fine) {
  .doc-item__link:hover {
    background: var(--surface);
  }

  .doc-item__link:hover .doc-item__title {
    text-decoration-thickness: 2px;
  }

  .doc-back:hover {
    color: var(--text);
    text-decoration: underline;
  }
}

@media (min-width: 640px) {
  :root {
    --page-padding: 1.5rem;
  }

  .page {
    padding-top: calc(2.5rem + var(--safe-top));
    padding-bottom: calc(3rem + var(--safe-bottom));
  }

  h1 {
    margin-bottom: 2rem;
  }

  h2 {
    font-size: 1.125rem;
    text-transform: none;
    letter-spacing: normal;
    color: var(--text);
  }

  .doc-item__link {
    padding: 1.1rem 0.5rem;
  }

  .doc-header {
    position: static;
    margin: 0 0 2rem;
    padding: 0 0 1.5rem;
    background: transparent;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    border-bottom: 1px solid var(--border);
  }

  .doc-back {
    min-height: auto;
  }
}