:root {
  --bg: #0b0d13;
  --panel: #131722;
  --panel-hover: #181d2b;
  --panel-active: rgba(79, 143, 255, 0.12);
  --border: #222836;
  --border-hover: #323b4e;
  --text: #f0f3f8;
  --text-muted: #8e99ac;
  --text-dim: #647087;

  --accent: #4f8fff;
  --accent-hover: #6ea4ff;
  --accent-mint: #2dd4bf;
  --accent-purple: #a78bfa;
  --accent-amber: #f59e0b;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

/* Site Header */
.site-header {
  border-bottom: 1px solid var(--border);
  background: rgba(19, 23, 34, 0.85);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 40;
  padding-top: env(safe-area-inset-top);
}

.header-inner {
  max-width: 1320px;
  margin: 0 auto;
  padding: 16px 24px;
}

.brand-title-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-logo-icon {
  font-size: 1.4rem;
  line-height: 1;
}

.header-brand h1 {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #fff;
}

/* Main Container */
#app {
  max-width: 1320px;
  margin: 0 auto;
  padding: 24px 24px 60px;
  min-height: calc(100vh - 140px);
}

/* Status / Loading */
.status {
  text-align: center;
  color: var(--text-muted);
  padding: 80px 20px;
  font-size: 1.05rem;
}

.status.error {
  color: #f87171;
}

/* Mobile Sticky Bar - Hidden by default on desktop */
.mobile-nav-bar {
  display: none;
  position: sticky;
  top: 65px;
  z-index: 35;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 8px 12px;
  margin-bottom: 18px;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
}

.mobile-nav-btn {
  appearance: none;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  font-family: inherit;
  font-size: 0.8rem;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  min-height: 40px;
  transition: all 0.15s ease;
}

.mobile-nav-btn:hover:not(:disabled) {
  background: var(--panel-hover);
  border-color: var(--border-hover);
}

.mobile-nav-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.mobile-drawer-trigger {
  appearance: none;
  background: transparent;
  border: 1px solid transparent;
  color: #fff;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  min-height: 40px;
}

.mobile-drawer-trigger:hover {
  background: var(--panel-hover);
}

/* Drawer Backdrop */
.drawer-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  z-index: 90;
}

/* Close button on drawer - hidden on desktop */
.drawer-close-btn {
  display: none;
  appearance: none;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-sm);
  align-items: center;
  justify-content: center;
}

.drawer-close-btn:hover {
  color: #fff;
  background: var(--panel-hover);
}

/* Layout: Sidebar + Main Content */
.digest-layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 28px;
  align-items: start;
}

/* Left Sidebar */
.sidebar {
  position: sticky;
  top: 80px;
  max-height: calc(100vh - 100px);
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 16px;
  overflow: hidden;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  padding: 0 4px;
}

.sidebar-title-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.sidebar-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.edition-count {
  font-size: 0.72rem;
  color: var(--text-muted);
  background: var(--bg);
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid var(--border);
}

/* Sidebar Search Box */
.sidebar-search-wrap {
  position: relative;
  margin-bottom: 12px;
}

.sidebar-search-wrap .search-icon {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-dim);
  pointer-events: none;
}

.sidebar-search {
  width: 100%;
  appearance: none;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 8px 12px 8px 32px;
  color: var(--text);
  font-family: inherit;
  font-size: 0.82rem;
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.sidebar-search:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(79, 143, 255, 0.2);
}

.sidebar-search::placeholder {
  color: var(--text-dim);
}

/* Date List Container */
.date-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow-y: auto;
  padding-right: 4px;
}

.date-list::-webkit-scrollbar {
  width: 5px;
}

.date-list::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

/* Month Accordion Grouping */
.month-group {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.month-header {
  appearance: none;
  background: transparent;
  border: none;
  padding: 6px 8px;
  color: var(--text-muted);
  font-family: inherit;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-radius: var(--radius-sm);
  transition: background 0.15s ease, color 0.15s ease;
  width: 100%;
}

.month-header:hover {
  color: #fff;
  background: var(--panel-hover);
}

.month-header-right {
  display: flex;
  align-items: center;
  gap: 6px;
}

.month-badge {
  font-size: 0.7rem;
  color: var(--text-dim);
  background: var(--bg);
  padding: 1px 6px;
  border-radius: 999px;
  border: 1px solid var(--border);
}

.chevron-icon {
  transition: transform 0.2s ease;
}

.month-group.collapsed .chevron-icon {
  transform: rotate(-90deg);
}

.month-items {
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.month-group.collapsed .month-items {
  display: none;
}

.date-nav-item {
  appearance: none;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  padding: 9px 12px;
  color: var(--text);
  font-family: inherit;
  font-size: 0.85rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  text-align: left;
  transition: all 0.15s ease;
  width: 100%;
}

.date-nav-item:hover {
  background: var(--panel-hover);
  border-color: var(--border);
}

.date-nav-item.active {
  background: var(--panel-active);
  border-color: var(--accent);
  color: #fff;
}

.date-nav-main {
  display: flex;
  flex-direction: column;
}

.date-weekday {
  font-weight: 600;
  font-size: 0.85rem;
}

.date-day-month {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.date-nav-item.active .date-day-month {
  color: #c7d9fa;
}

.date-nav-meta {
  display: flex;
  align-items: center;
  gap: 6px;
}

.badge-relative {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 2px 6px;
  border-radius: 4px;
  background: rgba(45, 212, 191, 0.15);
  color: var(--accent-mint);
  border: 1px solid rgba(45, 212, 191, 0.3);
}

.badge-count {
  font-size: 0.72rem;
  color: var(--text-dim);
  background: var(--bg);
  padding: 2px 7px;
  border-radius: 999px;
  border: 1px solid var(--border);
}

.date-nav-item.active .badge-count {
  border-color: rgba(79, 143, 255, 0.4);
  color: var(--accent);
}

.no-editions-found {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.82rem;
  padding: 24px 8px;
}

/* Main Content Panel */
.main-content {
  outline: none;
}


/* Category Blocks */
.category-block {
  margin-bottom: 32px;
}

.category-header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 14px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--border);
}

.category-title {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: #fff;
}

.category-count {
  font-size: 0.8rem;
  color: var(--text-dim);
}

/* Cards Grid */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 16px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.card:hover {
  transform: translateY(-2px);
  border-color: var(--border-hover);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.card-badge {
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 3px 8px;
  border-radius: 999px;
  background: rgba(79, 143, 255, 0.12);
  color: var(--accent);
  border: 1px solid rgba(79, 143, 255, 0.25);
}

.badge-gitlab_repo {
  background: rgba(245, 158, 11, 0.12);
  color: var(--accent-amber);
  border-color: rgba(245, 158, 11, 0.3);
}

.badge-framework {
  background: rgba(45, 212, 191, 0.12);
  color: var(--accent-mint);
  border-color: rgba(45, 212, 191, 0.3);
}

.badge-ontology_topology,
.badge-ontology {
  background: rgba(167, 139, 250, 0.12);
  color: var(--accent-purple);
  border-color: rgba(167, 139, 250, 0.3);
}

.badge-medium_article {
  background: rgba(236, 72, 153, 0.12);
  color: #f472b6;
  border-color: rgba(236, 72, 153, 0.3);
}

.card-source {
  font-size: 0.75rem;
  color: var(--text-dim);
  font-weight: 500;
}

.card h3 {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.4;
  font-weight: 600;
}

.card h3 a {
  color: #fff;
  text-decoration: none;
  display: inline;
  transition: color 0.15s ease;
}

.card h3 a:hover {
  color: var(--accent-hover);
}

.external-icon {
  display: inline-block;
  vertical-align: middle;
  margin-left: 4px;
  opacity: 0.6;
}

.card h3 a:hover .external-icon {
  opacity: 1;
}

.meta-date {
  font-size: 0.75rem;
  color: var(--text-dim);
}

.summary {
  margin: 0;
  font-size: 0.9rem;
  color: #cbd5e1;
  line-height: 1.5;
  flex-grow: 1;
}

.why-box {
  font-size: 0.82rem;
  color: #e2e8f0;
  background: var(--bg);
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent-mint);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  margin-top: 4px;
  line-height: 1.45;
}

.why-label {
  font-weight: 600;
  color: var(--accent-mint);
}


/* Empty State */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
  background: var(--panel);
  border: 1px dashed var(--border);
  border-radius: var(--radius-lg);
}

/* Footer */
.site-footer {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.78rem;
  padding: 20px 24px;
  padding-bottom: max(20px, env(safe-area-inset-bottom));
  border-top: 1px solid var(--border);
  background: var(--bg);
}

.site-footer a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.15s ease;
}

.site-footer a:hover {
  color: #fff;
  text-decoration: underline;
}

/* ======================================================
   Responsive Design: Mobile & Tablet Adaptations
   ====================================================== */

@media (max-width: 860px) {
  #app {
    padding: 14px 14px 60px;
  }

  .site-header {
    top: 0;
  }

  .header-inner {
    padding: 12px 16px;
  }

  .header-brand h1 {
    font-size: 1.2rem;
  }

  .subtitle {
    font-size: 0.75rem;
  }

  /* Show Sticky Mobile Bar */
  .mobile-nav-bar {
    display: flex;
    top: 60px;
  }

  /* Sidebar becomes a bottom sheet drawer on mobile */
  .digest-layout {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .sidebar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    top: auto;
    max-height: 80vh;
    border-radius: 20px 20px 0 0;
    border-bottom: none;
    z-index: 100;
    box-shadow: 0 -8px 30px rgba(0, 0, 0, 0.7);
    transform: translateY(105%);
    transition: transform 0.28s cubic-bezier(0.32, 0.72, 0, 1);
  }

  body.drawer-open .sidebar {
    transform: translateY(0);
  }

  body.drawer-open .drawer-backdrop {
    display: block;
  }

  .drawer-close-btn {
    display: flex;
  }

  .card-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .card {
    padding: 16px;
  }
}