:root {
  --bg-primary: #0f0f13;
  --bg-secondary: #1a1a24;
  --bg-card: #1e1e2e;
  --bg-card-hover: #252538;
  --bg-sidebar: #16161f;
  --border: #2a2a3d;
  --border-light: #353548;
  --text-primary: #e4e4ef;
  --text-secondary: #8888a0;
  --text-muted: #5e5e78;
  --accent: #7c6cf0;
  --accent-hover: #9488f5;
  --accent-dim: rgba(124, 108, 240, 0.1);
  --accent-border: rgba(124, 108, 240, 0.3);
  --tag-bg: rgba(124, 108, 240, 0.15);
  --tag-text: #a89cf5;
  --success: #4ade80;
  --danger: #f87171;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-xs: 6px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --transition: 0.2s ease;
  --toolbar-h: 48px;
  --sidebar-w: 340px;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* ── Modern Scrollbar ──────────────────── */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--border-light) transparent;
}

*::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

*::-webkit-scrollbar-track {
  background: transparent;
}

*::-webkit-scrollbar-thumb {
  background: var(--border-light);
  border-radius: 3px;
}

*::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: var(--accent-hover);
}

/* ── Header (glassmorphism, compact) ─────── */
.header {
  padding: 0.85rem 2rem;
  max-width: 100%;
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  background: rgba(15, 15, 19, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(124, 108, 240, 0.1);
  position: sticky;
  top: 0;
  z-index: 50;
}

.header h1 {
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--text-primary), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}

.header-divider {
  color: var(--text-muted);
  font-size: 1rem;
}

.header p {
  color: var(--text-muted);
  font-size: 0.85rem;
  white-space: nowrap;
}

/* ── Date Groups ───────────────────────────── */
.artifact-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem 3rem;
}

.date-group {
  margin-bottom: 1.5rem;
}

.date-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.75rem 0 0.4rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 0.75rem;
}

/* ── Card Links (↗ 📝 💭) ─────────────────── */
.card-links {
  margin-left: auto;
  display: flex;
  gap: 0.25rem;
}

.card-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  font-size: 0.75rem;
  border-radius: 4px;
  color: var(--text-muted);
  text-decoration: none;
  transition: all var(--transition);
}

.card-link:hover {
  background: var(--accent-dim);
  color: var(--accent);
}

/* ── Controls ───────────────────────────── */
.controls {
  display: flex;
  gap: 0.75rem;
  padding: 0 2rem;
  max-width: 1200px;
  margin: 1rem auto;
  flex-wrap: wrap;
  align-items: center;
}

.search-input {
  flex: 1;
  min-width: 200px;
  padding: 0.55rem 1rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.9rem;
  outline: none;
  transition: border-color var(--transition);
}

.search-input:focus {
  border-color: var(--accent);
}

.search-input::placeholder {
  color: var(--text-muted);
}

.filter-btn,
.view-btn {
  padding: 0.55rem 0.85rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.filter-btn:hover,
.filter-btn.active,
.view-btn:hover,
.view-btn.active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
}

.view-toggle {
  display: flex;
  gap: 0;
  margin-left: auto;
}

.view-toggle .view-btn {
  border-radius: 0;
}

.view-toggle .view-btn:first-child {
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
}

.view-toggle .view-btn:last-child {
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  border-left: none;
}

.count {
  color: var(--text-muted);
  font-size: 0.85rem;
  padding: 0 0.5rem;
}

/* ── Grid View ──────────────────────────── */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1rem;
}

/* ── List View ──────────────────────────── */
.list-view {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.list-view .card {
  flex-direction: row;
  align-items: center;
  padding: 0.85rem 1.25rem;
  gap: 1rem;
}

.list-view .card-title {
  flex: 1;
  font-size: 0.95rem;
}

.list-view .card-desc {
  display: none;
}

.list-view .card-tags {
  display: none;
}

.list-view .card-meta {
  margin-top: 0;
  padding-top: 0;
  gap: 0.5rem;
}

/* ── Card ───────────────────────────────── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  cursor: pointer;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent-border);
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.card-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.3;
}

.card-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: auto;
  padding-top: 0.5rem;
}

.card-date {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.card-type {
  font-size: 0.7rem;
  padding: 0.15rem 0.5rem;
  background: var(--tag-bg);
  color: var(--tag-text);
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

/* Type-specific badge colors */
.card-type.type-report {
  background: rgba(124, 108, 240, 0.15);
  color: #a89cf5;
}

.card-type.type-blog {
  background: rgba(52, 211, 153, 0.15);
  color: #34d399;
}

.card-type.type-guide {
  background: rgba(251, 191, 36, 0.15);
  color: #fbbf24;
}

.card-type.type-diagram {
  background: rgba(96, 165, 250, 0.15);
  color: #60a5fa;
}

.card-tags {
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
}

.tag {
  font-size: 0.7rem;
  padding: 0.1rem 0.4rem;
  background: var(--bg-secondary);
  color: var(--text-muted);
  border-radius: 3px;
  cursor: pointer;
  transition: color var(--transition), background var(--transition);
}

.tag:hover {
  color: var(--accent);
  background: var(--accent-dim);
}

/* ── Empty ──────────────────────────────── */
.empty {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
  grid-column: 1 / -1;
}

.empty h2 {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

.empty p {
  font-size: 0.9rem;
}

/* ── Viewer: Toolbar ────────────────────── */
.toolbar {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  height: var(--toolbar-h);
  position: sticky;
  top: 0;
  z-index: 100;
}

.toolbar-btn {
  padding: 0.35rem 0.7rem;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  color: var(--text-secondary);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
}

.toolbar-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.toolbar-btn.active {
  background: var(--accent-dim);
  border-color: var(--accent);
  color: var(--accent);
}

/* ── Version Dropdown ──────────────────── */
.version-dropdown {
  position: relative;
}

.version-trigger {
  gap: 0.3rem;
  font-variant-numeric: tabular-nums;
}

.version-trigger.version-old {
  color: var(--text-muted);
  border-color: var(--border-light);
  border-style: dashed;
}

.version-menu {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  min-width: 160px;
  background: rgba(22, 22, 31, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  overflow: hidden;
  opacity: 0;
  transform: translateY(-4px);
  pointer-events: none;
  transition: opacity 0.15s ease, transform 0.15s ease;
  z-index: 200;
}

.version-menu.open {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.version-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.5rem 0.75rem;
  cursor: pointer;
  transition: background var(--transition);
  font-size: 0.8rem;
}

.version-item:hover {
  background: var(--accent-dim);
}

.version-item.active {
  background: rgba(124, 108, 240, 0.08);
}

.version-label {
  font-weight: 600;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
}

.version-badge {
  font-size: 0.65rem;
  padding: 0.1rem 0.4rem;
  background: var(--accent-dim);
  color: var(--accent);
  border-radius: 3px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.version-date {
  font-size: 0.7rem;
  color: var(--text-muted);
}


.toolbar-title {
  font-size: 1rem;
  font-weight: 600;
  margin-left: 0.5rem;
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.toolbar-type {
  font-size: 0.65rem;
  padding: 0.12rem 0.5rem;
  background: var(--tag-bg);
  color: var(--tag-text);
  border-radius: 4px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.toolbar-date {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.toolbar-spacer {
  flex: 1;
}

/* ── Viewer: Content Area ───────────────── */
.viewer-layout {
  display: flex;
  height: calc(100vh - var(--toolbar-h));
  overflow: hidden;
}

.viewer-main {
  flex: 1;
  overflow: hidden;
}

.viewer-frame {
  width: 100%;
  height: 100%;
  border: none;
  background: white;
}

/* ── Viewer: md panels (artifact.md, context.md) ── */
.md-panel {
  padding: 2rem;
  max-width: 800px;
  margin: 0 auto;
  display: none;
  height: 100%;
  overflow-y: auto;
}

.md-panel.active {
  display: block;
}

.md-panel pre {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1.25rem;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--text-primary);
  white-space: pre-wrap;
}

/* ── Sidebar: Comments (floating overlay) ── */
.sidebar {
  position: fixed;
  top: var(--toolbar-h);
  right: 0;
  width: var(--sidebar-w);
  height: calc(100vh - var(--toolbar-h));
  background: rgba(22, 22, 31, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform var(--transition);
  z-index: 90;
  box-shadow: -8px 0 32px rgba(0, 0, 0, 0.3);
}

.sidebar.open {
  transform: translateX(0);
}

.sidebar-header {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sidebar-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.1rem;
  cursor: pointer;
  padding: 0.2rem 0.4rem;
}

.sidebar-close:hover {
  color: var(--text-primary);
}

.comment-list {
  flex: 1;
  overflow-y: auto;
  padding: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.comment {
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  padding: 0.65rem 0.85rem;
}

.comment-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.2rem;
}

.comment-author {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
}

.comment-date {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.comment-body {
  font-size: 0.85rem;
  color: var(--text-primary);
  white-space: pre-wrap;
  word-break: break-word;
}

.comment-form {
  padding: 0.75rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.comment-author-input {
  width: 100%;
  padding: 0.4rem 0.7rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 600;
  font-family: inherit;
  outline: none;
  transition: border-color var(--transition);
}

.comment-author-input:focus {
  border-color: var(--accent);
}

.comment-form-row {
  display: flex;
  gap: 0.4rem;
  align-items: flex-end;
}

.comment-form textarea {
  flex: 1;
  padding: 0.5rem 0.7rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  color: var(--text-primary);
  font-size: 0.8rem;
  font-family: inherit;
  outline: none;
  transition: border-color var(--transition);
  min-height: 36px;
  resize: vertical;
}

.comment-form textarea:focus {
  border-color: var(--accent);
}

.comment-form button {
  padding: 0.5rem 0.65rem;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: var(--radius-xs);
  font-size: 0.9rem;
  cursor: pointer;
  transition: background var(--transition);
  line-height: 1;
}

.comment-form button:hover {
  background: var(--accent-hover);
}

.no-comments {
  color: var(--text-muted);
  font-size: 0.85rem;
  text-align: center;
  padding: 2rem 1rem;
}

/* ── Responsive ─────────────────────────── */
@media (max-width: 768px) {
  .header {
    padding: 1.5rem 1rem 0.75rem;
    flex-direction: column;
    align-items: flex-start;
  }

  .controls {
    padding: 0 1rem;
  }

  .grid {
    padding: 1rem;
    grid-template-columns: 1fr;
  }

  .list-view {
    padding: 1rem;
  }

  .header-left h1 {
    font-size: 1.4rem;
  }

  .sidebar {
    width: 100%;
  }

  .viewer-main.sidebar-open {
    margin-right: 0;
  }
}

/* ── Footer ────────────────────────────── */
.hub-footer {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  padding: 2rem;
  margin-top: 2rem;
  color: var(--text-muted);
  font-size: 0.75rem;
  border-top: 1px solid var(--border);
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.hub-footer a {
  color: var(--text-muted);
  transition: color var(--transition);
}

.hub-footer a:hover {
  color: var(--accent);
}