:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-card: #ffffff;
  --border-color: #e2e8f0;
  --text-primary: #1a202c;
  --text-secondary: #4a5568;
  --text-muted: #718096;
  --accent-color: #f1592a;
  --accent-hover: #d94b1f;
  --link-color: #0088cc;
  --link-hover: #006699;
  --banner-bg: #fffaf0;
  --banner-border: #feebc8;
  --banner-text: #7b341e;
  --code-bg: #f7fafc;
  --post-bg: #ffffff;
  --modal-bg: rgba(0, 0, 0, 0.6);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-primary: #121212;
    --bg-secondary: #1e1e1e;
    --bg-card: #1e1e1e;
    --border-color: #2d3748;
    --text-primary: #f7fafc;
    --text-secondary: #e2e8f0;
    --text-muted: #a0aec0;
    --accent-color: #f1592a;
    --accent-hover: #ff7043;
    --link-color: #4da6ff;
    --link-hover: #80bfff;
    --banner-bg: #2a1f18;
    --banner-border: #4a2c1a;
    --banner-text: #ffd8bf;
    --code-bg: #2d3748;
    --post-bg: #181818;
    --modal-bg: rgba(0, 0, 0, 0.85);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  }
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: 15px;
}

a {
  color: var(--link-color);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

.header {
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-card);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.logo-img {
  width: 32px;
  height: 32px;
  border-radius: 6px;
}

.site-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary);
  text-decoration: none;
}

.site-badge {
  font-size: 0.72rem;
  font-weight: 600;
  background: var(--accent-color);
  color: #fff;
  padding: 2px 8px;
  border-radius: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.search-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  color: var(--text-muted);
  font-size: 0.88rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

.search-btn:hover {
  border-color: var(--accent-color);
  color: var(--text-primary);
}

.search-btn kbd {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 1px 5px;
  font-size: 0.75rem;
}

.archive-banner {
  background-color: var(--banner-bg);
  border-bottom: 1px solid var(--banner-border);
  color: var(--banner-text);
  padding: 10px 20px;
  text-align: center;
  font-size: 0.9rem;
}

.archive-banner a {
  color: var(--accent-color);
  font-weight: 600;
  text-decoration: underline;
}

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 24px 20px 60px;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 20px;
}

.breadcrumb a {
  color: var(--text-secondary);
}

.category-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border-radius: 4px;
  font-size: 0.82rem;
  font-weight: 600;
  color: #fff;
  text-decoration: none;
}

.category-badge:hover {
  opacity: 0.9;
  text-decoration: none;
}

.category-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
}

/* Authentic Discourse Nav Pills */
.nav-pills-bar {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
}

.nav-pills {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-pills > li {
  display: flex;
}

.nav-pills > li > a,
.nav-pill {
  display: inline-flex;
  align-items: center;
  padding: 10px 18px;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  border-bottom: 3px solid transparent;
  margin-bottom: -1px;
  transition: color 0.15s ease, border-color 0.15s ease;
  cursor: pointer;
  background: transparent;
  border-top: none;
  border-left: none;
  border-right: none;
}

.nav-pills > li > a:hover,
.nav-pill:hover {
  color: var(--text-primary);
  text-decoration: none;
}

.nav-pills > li > a.active,
.nav-pills > li.active > a,
.nav-pill.active {
  color: var(--text-primary);
  font-weight: 700;
  border-bottom: 3px solid var(--accent-color);
  background: transparent;
}

/* Authentic Discourse Category Boxes Layout */
.category-boxes {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
  margin-top: 10px;
  margin-bottom: 40px;
  width: 100%;
}

@media (max-width: 960px) {
  .category-boxes {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .category-boxes {
    grid-template-columns: 1fr;
  }
}

.category-box {
  position: relative;
  display: flex;
  flex-direction: column;
  box-sizing: border-box;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-left-width: 6px;
  border-left-style: solid;
  border-radius: 6px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
  min-height: 220px;
}

.category-box:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.08);
}

.category-box-inner {
  padding: 24px;
  display: flex;
  flex-direction: column;
  height: 100%;
  box-sizing: border-box;
  text-align: center;
}

.category-box-heading {
  margin-bottom: 12px;
}

.category-box-heading h3 {
  font-size: 1.3rem;
  font-weight: 700;
  margin: 0;
  line-height: 1.35;
}

.category-box-heading a {
  color: var(--text-primary);
  text-decoration: none;
}

.category-box .parent-box-link::before {
  content: "";
  position: absolute;
  z-index: 0;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
}

.category-box:hover .category-box-heading a {
  color: var(--accent-color);
}

.category-box-description {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 16px;
  flex-grow: 1;
  text-align: center;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.category-box-subcategories {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-top: auto;
  padding-top: 12px;
  padding-bottom: 8px;
}

.subcategory-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-primary);
  text-decoration: none;
  transition: border-color 0.15s ease, background-color 0.15s ease;
}

.subcategory-chip:hover {
  border-color: var(--accent-color);
  background-color: var(--bg-card);
  text-decoration: none;
}

.sub-square {
  width: 9px;
  height: 9px;
  border-radius: 2px;
  display: inline-block;
  flex-shrink: 0;
}

.custom-topic-count {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-top: 12px;
}

.custom-topic-count-title {
  margin-right: 4px;
}

.custom-topic-count-topics {
  font-weight: 700;
  color: var(--text-secondary);
}

.forum-tab-pane {
  width: 100%;
}

/* Topic Table */
.section-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.topic-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
}

.topic-table th {
  background: var(--bg-secondary);
  padding: 12px 16px;
  text-align: left;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border-color);
}

.topic-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.92rem;
  vertical-align: middle;
}

.topic-table tr:last-child td {
  border-bottom: none;
}

.topic-table tr:hover {
  background-color: var(--bg-secondary);
}

.topic-title-cell {
  max-width: 500px;
}

.topic-title-link {
  font-weight: 600;
  color: var(--text-primary);
  display: block;
  margin-bottom: 4px;
}

.topic-title-link:hover {
  color: var(--accent-color);
  text-decoration: none;
}

.topic-meta-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
}

.topic-stat-cell {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.88rem;
  white-space: nowrap;
}

.topic-date-cell {
  text-align: right;
  color: var(--text-muted);
  font-size: 0.82rem;
  white-space: nowrap;
}

/* Topic Details Page */
.topic-header {
  margin-bottom: 28px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.topic-header h1 {
  font-size: 1.7rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 12px;
}

.topic-header-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Post Stream */
.post-stream {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.post-card {
  background: var(--post-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.post-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
  gap: 12px;
}

.post-author-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.post-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
  background: var(--bg-secondary);
}

.post-author-names {
  display: flex;
  flex-direction: column;
}

.post-author-name {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-primary);
}

.post-author-username {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.post-meta-right {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.post-reply-to {
  font-size: 0.82rem;
  color: var(--link-color);
  margin-bottom: 8px;
}

.post-body {
  font-size: 0.96rem;
  line-height: 1.65;
  color: var(--text-primary);
  overflow-wrap: break-word;
}

.post-body p {
  margin-bottom: 14px;
}

.post-body h1, .post-body h2, .post-body h3, .post-body h4 {
  margin: 20px 0 10px;
  line-height: 1.3;
}

.post-body ul, .post-body ol {
  margin: 0 0 14px 24px;
}

.post-body li {
  margin-bottom: 4px;
}

.post-body blockquote {
  border-left: 4px solid var(--accent-color);
  padding: 8px 16px;
  margin: 14px 0;
  background: var(--bg-secondary);
  border-radius: 0 6px 6px 0;
  color: var(--text-secondary);
}

.post-body pre {
  background: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 14px;
  overflow-x: auto;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.88rem;
  margin: 14px 0;
}

.post-body code {
  background: var(--code-bg);
  padding: 2px 5px;
  border-radius: 4px;
  font-size: 0.88rem;
}

.post-body img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  margin: 10px 0;
}

.post-body table {
  border-collapse: collapse;
  width: 100%;
  margin: 16px 0;
}

.post-body table th, .post-body table td {
  border: 1px solid var(--border-color);
  padding: 8px 12px;
  font-size: 0.9rem;
}

.post-body table th {
  background: var(--bg-secondary);
}

.post-footer {
  margin-top: 14px;
  padding-top: 10px;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.post-likes {
  display: flex;
  align-items: center;
  gap: 4px;
  color: var(--accent-color);
  font-weight: 600;
}

/* Search Modal */
.search-modal {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--modal-bg);
  z-index: 1000;
  padding: 40px 20px;
  backdrop-filter: blur(3px);
  align-items: flex-start;
  justify-content: center;
}

.search-modal.active {
  display: flex;
}

.search-dialog {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  width: 100%;
  max-width: 650px;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.25);
  overflow: hidden;
}

.search-dialog-header {
  padding: 16px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 12px;
}

.search-input {
  width: 100%;
  border: none;
  background: transparent;
  font-size: 1.1rem;
  color: var(--text-primary);
  outline: none;
}

.search-close-btn {
  background: transparent;
  border: none;
  font-size: 1.2rem;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px 8px;
}

.search-results {
  overflow-y: auto;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.search-result-item {
  padding: 12px;
  border-radius: 6px;
  background: var(--bg-secondary);
  border: 1px solid transparent;
  text-decoration: none;
  transition: all 0.15s ease;
}

.search-result-item:hover {
  border-color: var(--accent-color);
  text-decoration: none;
}

.search-result-title {
  font-weight: 600;
  color: var(--text-primary);
  font-size: 0.95rem;
  margin-bottom: 4px;
}

.search-result-snippet {
  font-size: 0.84rem;
  color: var(--text-muted);
}

.footer {
  border-top: 1px solid var(--border-color);
  background: var(--bg-secondary);
  padding: 30px 20px;
  margin-top: 60px;
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-bottom: 12px;
}

/* User Profile */
.user-profile-header {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  margin-bottom: 30px;
}
.user-profile-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
}
.user-profile-details h1 {
  font-size: 1.5rem;
  margin-bottom: 4px;
}
.user-profile-handle {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 8px;
}
.user-profile-stats {
  display: flex;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.user-badge {
  font-size: 0.72rem;
  font-weight: 600;
  background: var(--accent-color);
  color: #fff;
  padding: 2px 8px;
  border-radius: 12px;
  text-transform: uppercase;
}

/* About Page */
.about-stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin: 24px 0 36px;
}
.about-stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 20px;
  text-align: center;
}
.about-stat-val {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent-color);
}
.about-stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-top: 4px;
}
.staff-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin: 20px 0;
}
.staff-card {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 14px;
  text-decoration: none;
  color: var(--text-primary);
}
.staff-card:hover {
  border-color: var(--accent-color);
  text-decoration: none;
}
.staff-avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
}
.staff-role {
  font-size: 0.75rem;
  color: var(--accent-color);
  font-weight: 600;
  text-transform: uppercase;
}


@media (max-width: 768px) {
  .header-container {
    padding: 10px 14px;
  }
  .container {
    padding: 16px 14px 40px;
  }
  .categories-grid {
    grid-template-columns: 1fr;
  }
  .topic-stat-cell, .topic-date-cell {
    display: none;
  }
  .post-header {
    flex-direction: column;
    align-items: flex-start;
  }
}