:root {
  --topics-accent: #eb5055;
  --topics-accent-soft: rgba(235, 80, 85, 0.09);
  --topics-text: #313131;
  --topics-muted: #777;
  --topics-line: #ececec;
  --topics-panel: #fff;
  --topics-page-bg: #f7f8fa;
}

body.topics-drawer-open {
  overflow: hidden;
}

.topics-page {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: 28px;
  width: 1180px;
  max-width: 100%;
  min-height: 760px;
  margin: 0 auto;
  padding: 110px 24px 48px;
  color: var(--topics-text);
  background: var(--topics-page-bg);
}

.topics-sidebar,
.topics-reader {
  border: 1px solid var(--topics-line);
  border-radius: 14px;
  background: var(--topics-panel);
  box-shadow: 0 8px 30px rgba(49, 49, 49, 0.05);
}

.topics-sidebar {
  position: sticky;
  top: 92px;
  align-self: start;
  max-height: calc(100vh - 116px);
  overflow-y: auto;
  padding: 24px 14px 16px;
}

.topics-sidebar-heading {
  padding: 0 10px 18px;
  border-bottom: 1px solid var(--topics-line);
}

.topics-eyebrow {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--topics-accent);
}

.topics-sidebar-heading h1 {
  margin: 7px 0 8px;
  font-size: 22px;
  font-weight: 600;
}

.topics-sidebar-heading p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--topics-muted);
}

.topics-nav {
  display: grid;
  gap: 7px;
  padding-top: 14px;
}

.topics-nav-item {
  display: grid;
  grid-template-columns: 36px minmax(0, 1fr) 18px;
  gap: 10px;
  align-items: center;
  padding: 11px 10px;
  color: var(--topics-text);
  border-radius: 9px;
  text-decoration: none;
  transition: color 0.2s ease, background-color 0.2s ease, transform 0.2s ease;
}

.topics-nav-item:hover,
.topics-nav-item.is-active {
  color: var(--topics-accent);
  background: var(--topics-accent-soft);
}

.topics-nav-item:hover {
  transform: translateX(2px);
}

.topics-nav-icon {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  font-size: 18px;
  border-radius: 9px;
  background: #f4f5f7;
}

.topics-nav-item.is-active .topics-nav-icon {
  background: #fff;
  box-shadow: 0 2px 10px rgba(235, 80, 85, 0.12);
}

.topics-nav-copy {
  min-width: 0;
}

.topics-nav-copy strong,
.topics-nav-copy small {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topics-nav-copy strong {
  font-size: 14px;
  font-weight: 500;
}

.topics-nav-copy small {
  margin-top: 2px;
  font-size: 11px;
  color: var(--topics-muted);
}

.topics-nav-arrow {
  color: #aaa;
}

.topics-reader {
  min-width: 0;
  min-height: 650px;
  padding: 44px 52px 52px;
}

.topics-loading {
  display: flex;
  gap: 10px;
  align-items: center;
  justify-content: center;
  min-height: 420px;
  font-size: 14px;
  color: var(--topics-muted);
}

.topics-loading-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--topics-accent);
  box-shadow: 0 0 0 0 rgba(235, 80, 85, 0.35);
  animation: topics-pulse 1.4s infinite;
}

.topic-overview-header,
.topic-article-header {
  padding-bottom: 26px;
  border-bottom: 1px solid var(--topics-line);
}

.topic-overview-header h2,
.topic-article-header h1 {
  margin: 8px 0 12px;
  font-size: 30px;
  line-height: 1.35;
  font-weight: 600;
  color: var(--topics-text);
}

.topic-overview-header > p,
.topic-article-header > p {
  max-width: 720px;
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--topics-muted);
}

.topic-overview-meta {
  display: flex;
  gap: 16px;
  margin-top: 18px;
  font-size: 12px;
  color: var(--topics-muted);
}

.topic-overview-meta span {
  display: inline-flex;
  gap: 5px;
  align-items: center;
}

.topic-directory-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  margin: 31px 0 14px;
}

.topic-directory-heading h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
}

.topic-directory-heading span {
  font-size: 12px;
  color: var(--topics-muted);
}

.topic-chapter-list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.topic-chapter-link {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr) 22px;
  gap: 15px;
  align-items: center;
  padding: 18px;
  color: var(--topics-text);
  border: 1px solid var(--topics-line);
  border-radius: 11px;
  text-decoration: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.topic-chapter-link:hover {
  color: var(--topics-text);
  border-color: rgba(235, 80, 85, 0.45);
  box-shadow: 0 8px 24px rgba(49, 49, 49, 0.07);
  transform: translateY(-1px);
}

.topic-chapter-index {
  font-size: 20px;
  font-weight: 600;
  color: var(--topics-accent);
  text-align: center;
}

.topic-chapter-copy {
  min-width: 0;
}

.topic-chapter-copy strong,
.topic-chapter-copy small,
.topic-chapter-copy time {
  display: block;
}

.topic-chapter-copy strong {
  font-size: 15px;
  font-weight: 500;
}

.topic-chapter-copy small {
  margin-top: 5px;
  line-height: 1.6;
  color: var(--topics-muted);
}

.topic-chapter-copy time {
  margin-top: 7px;
  font-size: 11px;
  color: #aaa;
}

.topic-chapter-arrow {
  color: #aaa;
  transition: color 0.2s ease, transform 0.2s ease;
}

.topic-chapter-link:hover .topic-chapter-arrow {
  color: var(--topics-accent);
  transform: translateX(2px);
}

.topic-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  align-items: center;
  font-size: 12px;
  color: var(--topics-muted);
}

.topic-breadcrumb a {
  color: var(--topics-accent);
  text-decoration: none;
}

.topic-article-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-top: 17px;
  font-size: 12px;
}

.topic-original-link {
  display: inline-flex;
  gap: 5px;
  align-items: center;
  color: var(--topics-muted);
  text-decoration: none;
}

.topic-original-link:hover {
  color: var(--topics-accent);
}

.topic-post-content {
  padding-top: 28px;
}

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

.topic-reader-pager {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 44px;
  padding-top: 22px;
  border-top: 1px solid var(--topics-line);
}

.topic-reader-pager a {
  display: flex;
  gap: 8px;
  align-items: center;
  min-width: 0;
  padding: 13px 15px;
  color: var(--topics-text);
  border: 1px solid var(--topics-line);
  border-radius: 9px;
  text-decoration: none;
}

.topic-reader-pager a:hover {
  color: var(--topics-accent);
  border-color: rgba(235, 80, 85, 0.45);
}

.topic-reader-pager a:last-child {
  justify-content: flex-end;
  text-align: right;
}

.topic-reader-pager span {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.topics-error,
.topics-empty {
  padding: 56px 20px;
  text-align: center;
  color: var(--topics-muted);
}

.topics-error i,
.topics-empty i {
  display: block;
  margin-bottom: 12px;
  font-size: 34px;
  color: var(--topics-accent);
}

.topics-error a {
  color: var(--topics-accent);
}

.topics-mobilebar,
.topics-drawer-overlay {
  display: none;
}

.topics-noscript h3 {
  margin-top: 28px;
}

.topics-noscript a {
  color: var(--topics-accent);
}

@keyframes topics-pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(235, 80, 85, 0.35);
  }
  70% {
    box-shadow: 0 0 0 8px rgba(235, 80, 85, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(235, 80, 85, 0);
  }
}

@media (max-width: 860px) {
  .topics-page {
    display: block;
    min-height: 620px;
    padding: 86px 16px 34px;
  }

  .topics-mobilebar {
    position: sticky;
    z-index: 50;
    top: 76px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
    padding: 10px 12px;
    border: 1px solid var(--topics-line);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.96);
    box-shadow: 0 5px 20px rgba(49, 49, 49, 0.06);
    backdrop-filter: blur(8px);
  }

  .topics-menu-toggle {
    display: inline-flex;
    gap: 7px;
    align-items: center;
    padding: 0;
    color: var(--topics-accent);
    border: 0;
    background: transparent;
    cursor: pointer;
  }

  .topics-mobile-current {
    overflow: hidden;
    max-width: 55%;
    font-size: 12px;
    color: var(--topics-muted);
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .topics-page.topics-enhanced .topics-sidebar {
    position: fixed;
    z-index: 1002;
    top: 0;
    bottom: 0;
    left: 0;
    width: min(82vw, 320px);
    max-height: none;
    padding: 32px 16px 24px;
    border: 0;
    border-radius: 0 14px 14px 0;
    transform: translateX(-105%);
    transition: transform 0.25s ease;
  }

  .topics-page.topics-enhanced.is-menu-open .topics-sidebar {
    transform: translateX(0);
  }

  .topics-page.topics-enhanced .topics-drawer-overlay {
    position: fixed;
    z-index: 1001;
    inset: 0;
    display: block;
    visibility: hidden;
    padding: 0;
    border: 0;
    opacity: 0;
    background: rgba(20, 24, 30, 0.42);
    transition: opacity 0.25s ease, visibility 0.25s ease;
  }

  .topics-page.topics-enhanced.is-menu-open .topics-drawer-overlay {
    visibility: visible;
    opacity: 1;
  }

  .topics-reader {
    min-height: 560px;
    padding: 34px 28px 40px;
  }
}

@media (max-width: 580px) {
  .topics-page {
    padding-right: 10px;
    padding-left: 10px;
  }

  .topics-mobilebar {
    top: 72px;
  }

  .topics-reader {
    padding: 27px 19px 34px;
    border-radius: 11px;
  }

  .topic-overview-header h2,
  .topic-article-header h1 {
    font-size: 24px;
  }

  .topic-overview-meta {
    display: grid;
    gap: 7px;
  }

  .topic-directory-heading {
    align-items: start;
  }

  .topic-chapter-link {
    grid-template-columns: 38px minmax(0, 1fr) 18px;
    gap: 10px;
    padding: 15px 12px;
  }

  .topic-chapter-index {
    font-size: 17px;
  }

  .topic-chapter-copy small {
    display: none;
  }

  .topic-reader-pager {
    grid-template-columns: 1fr;
  }

  .topic-reader-pager a:last-child {
    justify-content: flex-start;
    text-align: left;
  }
}

@media (prefers-reduced-motion: reduce) {
  .topics-nav-item,
  .topic-chapter-link,
  .topics-sidebar,
  .topics-drawer-overlay {
    transition: none;
  }

  .topics-loading-dot {
    animation: none;
  }
}