html {
  scroll-behavior: smooth;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, sans-serif;
  color: #1f2933;
  background: #f3f6f9;
  line-height: 1.6;
  overflow: hidden;
}

a {
  color: #0b5cab;
}

.help-shell {
  display: grid;
  grid-template-columns: 320px minmax(0, 1fr);
  height: 100vh;
  min-height: 0;
}

.help-sidebar {
  display: flex;
  flex-direction: column;
  background: linear-gradient(180deg, #12344d 0%, #0f2740 100%);
  color: #eaf2f8;
  border-right: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 2px 0 12px rgba(0, 0, 0, 0.15);
  height: 100%;
  overflow: hidden;
}

.help-sidebar-header {
  padding: 18px 20px 10px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.help-sidebar-title {
  margin: 0;
  font-size: 1rem;
  font-weight: 700;
  color: #ffffff;
}

.help-sidebar-subtitle {
  margin: 6px 0 0 0;
  font-size: 0.88rem;
  color: #b8d4ea;
}

.help-tabs {
  display: flex;
  gap: 6px;
  padding: 12px 14px 10px 14px;
}

.help-tab {
  flex: 1 1 0;
  padding: 9px 10px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.06);
  color: #d9ecfb;
  font-size: 0.9rem;
  cursor: pointer;
}

.help-tab.is-active {
  background: #eaf2f8;
  color: #12344d;
  border-color: #eaf2f8;
  font-weight: 700;
}

.help-panels {
  flex: 1 1 auto;
  min-height: 0;
}

.help-panel {
  display: none;
  height: 100%;
  padding: 12px 18px 24px 18px;
  overflow-y: auto;
  box-sizing: border-box;
}

.help-panel.is-active {
  display: block;
}

.help-panel-title {
  margin: 0 0 12px 0;
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: #9fd3ff;
}

.help-main {
  min-width: 0;
  background: #f8fbfd;
  height: 100%;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.help-main-toolbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  padding: 0 0 16px 0;
  background: linear-gradient(180deg, #f8fbfd 0%, #f8fbfd 76%, rgba(248, 251, 253, 0) 100%);
}

.help-nav-button {
  padding: 8px 14px;
  border: 1px solid #bcccdc;
  border-radius: 10px;
  background: #ffffff;
  color: #102a43;
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(16, 42, 67, 0.06);
}

.help-nav-button:hover {
  background: #f0f4f8;
}

.help-nav-button:disabled {
  opacity: 0.45;
  cursor: default;
  box-shadow: none;
}

.help-main-inner {
  max-width: 1080px;
  padding: 0 34px 40px 34px;
  box-sizing: border-box;
}

.content-body > :first-child {
  margin-top: 0;
}

.content-body h1,
.content-body h2,
.content-body h3,
.content-body h4 {
  color: #102a43;
}

.content-body h1 {
  font-size: 2rem;
  margin-bottom: 1rem;
  line-height: 1.2;
}

.content-body h2 {
  margin-top: 2.5rem;
  padding-top: 0.2rem;
  border-top: 1px solid #d9e2ec;
}

.content-body p,
.content-body ul,
.content-body ol,
.content-body blockquote,
.content-body pre,
.content-body table {
  font-size: 0.98rem;
}

.content-body ul,
.content-body ol {
  padding-left: 2.2rem;
}

.content-body blockquote {
  margin-left: 0;
  border-left: 4px solid #bcccdc;
  background: #f0f4f8;
  padding: 0.7rem 1rem;
  border-radius: 4px;
}

.content-body code {
  background: #eaf2f8;
  padding: 0.08rem 0.3rem;
  border-radius: 4px;
}

.content-body pre {
  overflow-x: auto;
}

.content-body pre code {
  background: transparent;
  padding: 0;
}

.content-body img {
  display: block;
  max-width: min(100%, 920px);
  margin: 1rem 0 1.6rem 0;
  border: 1px solid #d9e2ec;
  box-shadow: 0 8px 20px rgba(16, 42, 67, 0.08);
  background: #fff;
}

.content-body figure {
  margin: 1rem 0 1.6rem 0;
}

.content-body figure img {
  margin-bottom: 0.5rem;
}

.content-body figcaption {
  color: #486581;
  font-size: 0.92rem;
}

.content-body hr {
  border: none;
  border-top: 1px solid #d9e2ec;
  margin: 2rem 0;
}

.toc-tree,
.toc-tree ul {
  list-style: none;
  margin: 0;
  padding-left: 0.9rem;
}

.toc-tree {
  padding-left: 0;
}

.toc-tree li {
  margin: 0.3rem 0;
}

.toc-tree a {
  color: #eaf2f8;
  text-decoration: none;
}

.toc-tree a:hover {
  text-decoration: underline;
}

.toc-tree ul ul ul ul a {
  font-size: 0.82rem;
  color: #a8c8e0;
}

.help-search-box,
.help-keyword-box {
  width: 100%;
  box-sizing: border-box;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid #8eb7d4;
  font-size: 0.95rem;
  outline: none;
}

.help-search-box:focus,
.help-keyword-box:focus {
  border-color: #1f78d1;
  box-shadow: 0 0 0 3px rgba(31, 120, 209, 0.18);
}

.help-search-hint,
.help-keyword-hint {
  margin: 10px 0 14px 0;
  font-size: 0.86rem;
  color: #b8d4ea;
}

.search-results,
.keyword-results {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.search-empty,
.keyword-empty {
  margin-top: 10px;
  font-size: 0.92rem;
  color: #c6d9e8;
}

.search-result,
.keyword-item {
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 12px 12px 10px 12px;
}

.search-result-title,
.keyword-item-title {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 700;
}

.search-result-title a,
.keyword-item-title a {
  color: #ffffff;
  text-decoration: none;
}

.search-result-title a:hover,
.keyword-item-title a:hover {
  text-decoration: underline;
}

.search-result-meta,
.keyword-item-meta {
  margin: 5px 0 0 0;
  font-size: 0.8rem;
  color: #9fd3ff;
}

.search-result-snippet,
.keyword-item-snippet {
  margin: 8px 0 0 0;
  font-size: 0.9rem;
  color: #d9ecfb;
}

.search-result mark,
.keyword-item mark {
  background: #ffe58f;
  color: #102a43;
  padding: 0 0.1rem;
  border-radius: 3px;
}

.content-highlight {
  animation: content-highlight-fade 2.2s ease-out;
}

@keyframes content-highlight-fade {
  0% {
    background: #fff2b3;
  }

  100% {
    background: transparent;
  }
}

@media (max-width: 980px) {
  body {
    overflow: auto;
  }

  .help-shell {
    grid-template-columns: 1fr;
    height: auto;
    min-height: 100vh;
  }

  .help-sidebar {
    box-shadow: none;
    height: auto;
    overflow: visible;
  }

  .help-main {
    height: auto;
    overflow: visible;
  }

  .help-main-inner {
    padding: 20px 18px 28px 18px;
  }

  .help-main-toolbar {
    justify-content: flex-start;
    flex-wrap: wrap;
  }
}