:root {
  --orange: #f36f21;
  --orange-dark: #c75213;
  --orange-pale: #fff1e8;
  --ink: #202625;
  --muted: #727c78;
  --line: #e3e7e4;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  color: var(--ink);
  background: #fff;
  font-family: "Inter", ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

.viewer-header {
  position: sticky;
  z-index: 10;
  top: 0;
  display: grid;
  grid-template-columns: 1fr minmax(260px, 1.4fr) 1fr;
  align-items: center;
  min-height: 64px;
  padding: 0 28px;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(14px);
}

.back-link,
.native-link {
  color: var(--orange-dark);
  font-size: 12px;
  font-weight: 650;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: fit-content;
}

.back-link > span:first-child {
  font-size: 20px;
  font-weight: 400;
  line-height: 0.7;
}

.viewer-heading {
  min-width: 0;
  text-align: center;
}

.viewer-category,
.viewer-heading strong {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.viewer-category {
  margin-bottom: 2px;
  color: var(--orange);
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.14em;
}

.viewer-heading strong {
  font-size: 14px;
  font-weight: 650;
}

.native-link {
  justify-self: end;
  color: var(--muted);
  font-weight: 550;
}

.native-link:hover,
.native-link:focus-visible,
.back-link:hover,
.back-link:focus-visible {
  color: var(--orange);
  outline: none;
}

.related-docs {
  display: flex;
  align-items: center;
  gap: 8px;
  width: min(100% - 40px, 1120px);
  min-height: 48px;
  margin: 0 auto;
  overflow-x: auto;
  border-bottom: 1px solid var(--line);
  scrollbar-width: thin;
}

.related-label {
  flex: 0 0 auto;
  margin-right: 5px;
  color: var(--muted);
  font-size: 11px;
}

.related-link,
.related-current {
  display: inline-flex;
  min-height: 28px;
  align-items: center;
  padding: 0 9px;
  border-radius: 4px;
  font-size: 11px;
  white-space: nowrap;
}

.related-link {
  color: var(--muted);
}

.related-link:hover,
.related-link:focus-visible {
  color: var(--orange-dark);
  background: var(--orange-pale);
  outline: none;
}

.related-current {
  color: var(--orange-dark);
  background: var(--orange-pale);
  font-weight: 650;
}

.viewer-main {
  width: min(100% - 40px, 1120px);
  min-height: calc(100vh - 64px);
  margin: 0 auto;
  padding: 30px 0 70px;
}

.viewer-state {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 56px;
  color: var(--muted);
  font-size: 13px;
}

.viewer-state.is-error {
  display: block;
  padding: 40px 20px;
  color: var(--muted);
  text-align: center;
  background: #fff8f3;
  border: 1px solid #f5d9c5;
  border-radius: 10px;
}

.viewer-state.is-error strong,
.viewer-state.is-error a {
  color: var(--orange-dark);
}

.viewer-state.is-error strong {
  display: block;
  margin-bottom: 5px;
  font-size: 15px;
}

.viewer-state.is-error a {
  text-decoration: underline;
}

.loading-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid #f8d4bd;
  border-top-color: var(--orange);
  border-radius: 999px;
  animation: spin 750ms linear infinite;
}

.pdf-pages {
  display: grid;
  gap: 18px;
}

.pdf-page {
  display: block;
  width: 100%;
  height: auto;
  background: #fff;
  box-shadow: 0 2px 12px rgba(27, 39, 34, 0.1);
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 680px) {
  .viewer-header {
    grid-template-columns: auto 1fr auto;
    gap: 14px;
    min-height: 58px;
    padding: 0 14px;
  }

  .back-label {
    display: none;
  }

  .viewer-heading {
    text-align: left;
  }

  .native-link {
    font-size: 0;
  }

  .native-link span {
    font-size: 18px;
  }

  .viewer-main {
    width: 100%;
    padding: 0 0 40px;
  }

  .related-docs {
    width: 100%;
    padding: 0 14px;
  }

  .pdf-pages {
    gap: 8px;
  }

  .pdf-page {
    box-shadow: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .loading-spinner {
    animation: none;
  }
}