/* ═══════════════════════════════════════════════════════════
   Scikit-learn Central v2 — Component Styles
   ═══════════════════════════════════════════════════════════ */

/* ── App Shell ─────────────────────────────────────────────── */
.app-header {
  position: sticky;
  top: 0;
  z-index: 200;
  height: var(--header-h);
  background: var(--bg-primary);
  box-shadow: 0 2px 16px rgba(14,17,90,.35);
  display: flex;
  align-items: center;
}

.app-header__inner {
  width: 100%;
  max-width: calc(var(--sidebar-w) + var(--content-max) + var(--space-8));
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

/* Logo mark */
.app-header__logo {
  flex-shrink: 0;
  width: 38px;
  height: 38px;
  background: var(--neutral-000);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4px;
}

.app-header__logo img {
  width: 30px;
  height: 30px;
  object-fit: contain;
}

/* Title */
.app-header__title {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: var(--tracking-tight);
  color: var(--probabl-orange);
  line-height: 1;
}

.app-header__tagline {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: rgba(255,255,255,.55);
  letter-spacing: var(--tracking-wide);
  margin-top: 3px;
}

.app-header__actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* ── App Layout ────────────────────────────────────────────── */
.app-layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: calc(100vh - var(--header-h));
  align-items: start;
}

/* ── Sidebar ───────────────────────────────────────────────── */
.sidebar {
  position: sticky;
  top: var(--header-h);
  height: calc(100vh - var(--header-h));
  overflow-y: auto;
  background: var(--bg-surface);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: 0;
}

.sidebar__search {
  padding: var(--space-5) var(--space-5) var(--space-4);
  border-bottom: 1px solid var(--border-subtle);
}

.search-input {
  width: 100%;
  padding: 9px 14px;
  border: 1.5px solid var(--border-default);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--text-primary);
  background: var(--bg-page);
  transition: border-color var(--duration-sm) var(--ease),
              box-shadow var(--duration-sm) var(--ease);
}

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

.search-input:focus {
  outline: none;
  border-color: var(--probabl-blue);
  box-shadow: 0 0 0 3px rgba(30,34,170,.08);
}

.sidebar__filter-group {
  border-bottom: 1px solid var(--border-subtle);
}

.sidebar__filter-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-5);
  cursor: pointer;
  user-select: none;
  transition: background var(--duration-sm) var(--ease);
}

.sidebar__filter-header:hover {
  background: var(--bg-surface-alt);
}

.sidebar__filter-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: var(--tracking-widest);
  color: var(--text-muted);
}

.sidebar__filter-toggle {
  font-size: var(--text-xs);
  color: var(--text-muted);
  transition: transform var(--duration-sm) var(--ease);
}

.sidebar__filter-group.is-open .sidebar__filter-toggle {
  transform: rotate(180deg);
}

.sidebar__filter-body {
  display: none;
  padding: var(--space-2) var(--space-5) var(--space-4);
  flex-direction: column;
  gap: var(--space-2);
}

.sidebar__filter-group.is-open .sidebar__filter-body {
  display: flex;
}

/* Filter checkboxes */
.filter-option {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
  padding: 3px 0;
}

.filter-option input[type="checkbox"] {
  width: 14px;
  height: 14px;
  accent-color: var(--probabl-blue);
  cursor: pointer;
  flex-shrink: 0;
}

.filter-option__label {
  font-size: var(--text-base);
  color: var(--text-secondary);
  flex: 1;
}

.filter-option__count {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
}

/* Sort */
.sidebar__sort {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--border-subtle);
}

.sidebar__sort-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: var(--tracking-widest);
  color: var(--text-muted);
  display: block;
  margin-bottom: var(--space-2);
}

.sort-select {
  width: 100%;
  padding: 8px 12px;
  border: 1.5px solid var(--border-default);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--text-primary);
  background: var(--bg-page);
  cursor: pointer;
  appearance: auto;
  transition: border-color var(--duration-sm) var(--ease);
}

.sort-select:focus {
  outline: none;
  border-color: var(--probabl-blue);
}

.sidebar__reset {
  margin: var(--space-4) var(--space-5);
}

/* ── Content Area ──────────────────────────────────────────── */
.content {
  padding: var(--space-7) var(--space-8) var(--space-12);
  max-width: var(--content-max);
}

/* ── Stats Strip ───────────────────────────────────────────── */
.stats-strip {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  background: var(--probabl-blue);
  border-radius: var(--radius-lg);
  padding: var(--space-5) var(--space-7);
  margin-bottom: var(--space-6);
  justify-content: space-around;
}

.stats-strip__item {
  text-align: center;
}

.stats-strip__value {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--probabl-orange);
  letter-spacing: var(--tracking-tight);
  line-height: 1;
}

.stats-strip__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: rgba(255,255,255,.6);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  margin-top: var(--space-1);
}

.stats-strip__divider {
  width: 1px;
  height: 36px;
  background: rgba(255,255,255,.15);
}

/* ── Scikit-learn Hero Card ────────────────────────────────── */
/* Always visible — the core of the ecosystem, never filtered */
.sklearn-hero {
  background: var(--probabl-blue);
  border-radius: var(--radius-xl);
  padding: var(--space-8) var(--space-10);
  margin-bottom: var(--space-6);
  position: relative;
  overflow: hidden;
}

/* Decorative glow ring top-right */
.sklearn-hero::before {
  content: '';
  position: absolute;
  top: -60px;
  right: -60px;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  background: rgba(246,141,46,.10);
  pointer-events: none;
}

.sklearn-hero__corner-tag {
  position: absolute;
  top: 0;
  right: 0;
  background: var(--probabl-orange);
  color: var(--probabl-blue);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  padding: 6px 18px;
  border-bottom-left-radius: var(--radius-md);
}

.sklearn-hero__body {
  display: flex;
  gap: var(--space-8);
  align-items: flex-start;
}

.sklearn-hero__logo {
  flex-shrink: 0;
  width: 100px;
  height: 100px;
  background: var(--neutral-000);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3);
}

.sklearn-hero__logo img {
  width: 76px;
  height: 76px;
  object-fit: contain;
}

.sklearn-hero__content { flex: 1; min-width: 0; }

.sklearn-hero__pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: var(--probabl-orange);
  color: var(--probabl-blue);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  padding: 3px 12px;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-3);
}

.sklearn-hero__name {
  font-family: var(--font-mono);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--probabl-orange);
  letter-spacing: var(--tracking-tight);
  line-height: 1;
  margin-bottom: var(--space-3);
}

.sklearn-hero__description {
  font-size: var(--text-md);
  color: rgba(255,255,255,.82);
  line-height: 1.65;
  max-width: 640px;
  margin-bottom: var(--space-5);
}

.sklearn-hero__badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.sklearn-hero__badges .badge {
  background: rgba(255,255,255,.12);
  color: rgba(255,255,255,.9);
  border: 1px solid rgba(255,255,255,.18);
}

.sklearn-hero__compat {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}

.sklearn-hero__compat-pill {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  background: rgba(246,141,46,.18);
  color: var(--probabl-orange);
}

.sklearn-hero__stats {
  display: flex;
  gap: var(--space-6);
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
}

.sklearn-hero__stat {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--probabl-orange);
  display: flex;
  align-items: center;
  gap: 5px;
}

.sklearn-hero__links {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-5);
}

.sklearn-hero__link {
  padding: 8px 18px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--probabl-orange);
  color: var(--probabl-orange);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  text-decoration: none;
  transition: all var(--duration-md) var(--ease);
}

.sklearn-hero__link:hover {
  background: rgba(246,141,46,.12);
  color: var(--probabl-orange);
}

.sklearn-hero__link--filled {
  background: var(--probabl-orange);
  color: var(--probabl-blue);
}

.sklearn-hero__link--filled:hover {
  background: var(--orange-400);
  border-color: var(--orange-400);
  color: var(--probabl-blue);
}

.sklearn-hero__contributors {
  border-top: 1px solid rgba(255,255,255,.12);
  padding-top: var(--space-4);
  margin-top: var(--space-2);
}

.sklearn-hero__contributors-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: var(--tracking-widest);
  color: rgba(255,255,255,.4);
  margin-bottom: var(--space-2);
}

.sklearn-hero__contributor-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.sklearn-hero__contributor {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: rgba(255,255,255,.7);
  background: rgba(255,255,255,.07);
  padding: 3px 9px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: background var(--duration-sm) var(--ease);
}

.sklearn-hero__contributor:hover {
  background: rgba(255,255,255,.14);
  color: rgba(255,255,255,.9);
}

/* ── Catalog Section Header ────────────────────────────────── */
.catalog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}

.catalog-header__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: var(--tracking-widest);
  color: var(--text-muted);
}

.catalog-header__count {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
  background: var(--bg-surface-alt);
  padding: 2px 9px;
  border-radius: var(--radius-full);
}

/* ── Active Filters ────────────────────────────────────────── */
.active-filters {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.active-filter-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  background: var(--blue-050);
  color: var(--probabl-blue);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  border: 1px solid var(--blue-100);
  cursor: pointer;
  transition: background var(--duration-sm) var(--ease);
}

.active-filter-tag:hover {
  background: var(--blue-100);
}

.active-filter-tag__remove { opacity: .6; font-size: .7em; }

/* ── Catalog Grid ──────────────────────────────────────────── */
.catalog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-5);
}

/* ── Package Card ──────────────────────────────────────────── */
.card {
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--border-subtle);
  padding: var(--space-6);
  position: relative;
  overflow: hidden;
  transition: border-color var(--duration-md) var(--ease),
              transform var(--duration-md) var(--ease),
              box-shadow var(--duration-md) var(--ease);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.card:hover {
  border-color: var(--probabl-blue);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

/* Ranking badge */
.card__ranking {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  background: var(--probabl-blue);
  color: var(--probabl-orange);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

.card__name {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: var(--tracking-tight);
  padding-right: 56px; /* avoid ranking badge overlap */
}

/* ── Badges ────────────────────────────────────────────────── */
.badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 2px 9px;
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  white-space: nowrap;
}

/* Nature badges */
.badge--library    { background: var(--blue-050);  color: var(--probabl-blue); }
.badge--extension  { background: rgba(246,141,46,.12); color: var(--orange-700); }
.badge--application{ background: #F0FDF4; color: #15803D; }

/* Scope badges */
.badge--core       { background: var(--probabl-orange); color: var(--probabl-blue); }
.badge--incremental{ background: rgba(246,141,46,.14); color: var(--orange-700); }
.badge--verticalized{ background: #F5F3FF; color: #7C3AED; }

/* License badge */
.badge--license    { background: var(--neutral-200); color: var(--neutral-700); }

/* Maintenance badges */
.badge--active      { background: var(--status-active-bg);      color: var(--status-active); }
.badge--maintained  { background: var(--status-maintained-bg);  color: var(--status-maintained); }
.badge--deprecated  { background: var(--status-deprecated-bg);  color: var(--status-deprecated); }
.badge--archived    { background: var(--status-archived-bg);    color: var(--status-archived); }

/* ── Card Description ──────────────────────────────────────── */
.card__description {
  font-size: var(--text-base);
  color: var(--text-secondary);
  line-height: 1.65;
}

/* ── Compatibility Indicators ──────────────────────────────── */
.compat-row {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.compat-pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  padding: 3px 9px;
  border-radius: var(--radius-sm);
  background: var(--neutral-200);
  color: var(--text-muted);
}

.compat-pill--yes {
  background: var(--blue-050);
  color: var(--probabl-blue);
}

.compat-pill--no {
  opacity: .55;
}

/* ── Card Stats ────────────────────────────────────────────── */
.card__stats {
  display: flex;
  gap: var(--space-4);
}

.card__stat {
  display: flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
}

/* ── Tags ──────────────────────────────────────────────────── */
.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
  background: var(--bg-page);
  border: 1px solid var(--border-subtle);
  padding: 1px 7px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color var(--duration-sm) var(--ease),
              color var(--duration-sm) var(--ease);
}

.tag:hover {
  border-color: var(--probabl-blue);
  color: var(--probabl-blue);
}

/* ── Card Contributors ─────────────────────────────────────── */
.card__contributors {
  border-top: 1px solid var(--border-subtle);
  padding-top: var(--space-3);
}

.card__contributors-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: var(--tracking-widest);
  color: var(--text-muted);
  margin-bottom: var(--space-2);
}

.card__contributors-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.contributor-chip {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-secondary);
  background: var(--neutral-200);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: background var(--duration-sm) var(--ease);
}

.contributor-chip:hover {
  background: var(--blue-050);
  color: var(--probabl-blue);
}

/* ── Card Links ────────────────────────────────────────────── */
.card__links {
  display: flex;
  gap: var(--space-2);
  margin-top: auto; /* push to bottom of card */
  padding-top: var(--space-2);
}

.card__link {
  flex: 1;
  padding: 6px 10px;
  border: 1.5px solid var(--border-default);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: var(--text-secondary);
  text-decoration: none;
  text-align: center;
  transition: all var(--duration-sm) var(--ease);
}

.card__link:hover {
  border-color: var(--probabl-blue);
  color: var(--probabl-blue);
}

/* Install tooltip */
.card__install {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-muted);
  background: var(--bg-page);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 4px var(--space-3);
  cursor: pointer;
  transition: all var(--duration-sm) var(--ease);
}

.card__install:hover {
  border-color: var(--probabl-blue);
  color: var(--probabl-blue);
}

.card__install i { font-size: .75em; opacity: .7; }

/* ── Empty / Loading States ────────────────────────────────── */
.state-empty,
.state-loading,
.state-error {
  grid-column: 1 / -1;
  padding: var(--space-16) var(--space-8);
  text-align: center;
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--border-subtle);
}

.state-empty__icon {
  font-size: 2.5rem;
  margin-bottom: var(--space-4);
  opacity: .35;
}

.state-empty__title {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: var(--space-2);
}

.state-empty__subtitle {
  font-size: var(--text-base);
  color: var(--text-muted);
  max-width: 360px;
  margin: 0 auto var(--space-5);
}

/* Loading spinner */
@keyframes spin {
  to { transform: rotate(360deg); }
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border-subtle);
  border-top-color: var(--probabl-blue);
  border-radius: 50%;
  animation: spin .8s linear infinite;
  margin: 0 auto var(--space-4);
}

/* ── Submission Modal ──────────────────────────────────────── */
.modal-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.5);
  z-index: 500;
  overflow-y: auto;
  padding: var(--space-8) var(--space-5);
}

.modal-backdrop.is-open {
  display: block;
}

.modal {
  background: var(--bg-surface);
  max-width: 580px;
  margin: 0 auto;
  border-radius: var(--radius-xl);
  padding: var(--space-10);
  position: relative;
}

.modal__close {
  position: absolute;
  top: var(--space-5);
  right: var(--space-6);
  background: none;
  border: none;
  font-size: 1.4rem;
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
  transition: color var(--duration-sm) var(--ease);
}

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

.modal__title {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--probabl-blue);
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-7);
}

.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  color: var(--text-muted);
  margin-bottom: var(--space-2);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--border-default);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--text-primary);
  background: var(--bg-page);
  transition: border-color var(--duration-sm) var(--ease);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--probabl-blue);
  box-shadow: 0 0 0 3px rgba(30,34,170,.07);
}

.form-textarea {
  min-height: 90px;
  resize: vertical;
}

.form-checkboxes {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-top: var(--space-2);
}

.form-checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
  font-size: var(--text-base);
}

.form-checkbox-label input[type="checkbox"] {
  width: 15px;
  height: 15px;
  accent-color: var(--probabl-blue);
  cursor: pointer;
}

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 900px) {
  .app-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border-subtle);
  }

  .content {
    padding: var(--space-5) var(--space-5) var(--space-10);
  }

  .catalog-grid {
    grid-template-columns: 1fr;
  }

  .sklearn-hero__body {
    flex-direction: column;
    gap: var(--space-5);
  }

  .sklearn-hero {
    padding: var(--space-6) var(--space-5);
  }

  .stats-strip {
    gap: 0;
    flex-wrap: wrap;
  }

  .stats-strip__divider { display: none; }
}

@media (max-width: 640px) {
  .app-header__tagline { display: none; }
  .app-header__title { font-size: var(--text-lg); }
}


/* ═══════════════════════════════════════════════════════════
   Scikit-learn Central v3 — Additional Components
   ═══════════════════════════════════════════════════════════ */

/* ── View Tabs (Catalog / Use Cases) ────────────────────── */
.view-tabs {
  background: var(--bg-primary);
  border-bottom: 2px solid rgba(255,255,255,.1);
  display: flex;
  align-items: center;
  padding: 0 var(--space-6);
  gap: 0;
}

.view-tab {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: var(--tracking-wide);
  color: rgba(255,255,255,.55);
  text-transform: uppercase;
  padding: var(--space-3) var(--space-5);
  border: none;
  background: transparent;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: color .15s, border-color .15s;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.view-tab:hover {
  color: rgba(255,255,255,.85);
}

.view-tab.is-active {
  color: var(--probabl-orange);
  border-bottom-color: var(--probabl-orange);
}

.view-tab__count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  padding: 0 6px;
  background: rgba(246,141,46,.18);
  color: var(--probabl-orange);
  border-radius: 10px;
  font-size: 11px;
  font-weight: 700;
}

.view-tab.is-active .view-tab__count {
  background: var(--probabl-orange);
  color: var(--probabl-blue);
}

/* ── Use-Cases Sidebar ──────────────────────────────────── */
.uc-sidebar {
  position: sticky;
  top: calc(var(--header-h) + 40px); /* header + view tabs */
  height: calc(100vh - var(--header-h) - 40px);
  overflow-y: auto;
  padding: var(--space-5) var(--space-4);
  background: var(--bg-page);
  border-right: 1px solid var(--neutral-200);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  scrollbar-width: thin;
  scrollbar-color: var(--neutral-300) transparent;
}

.uc-sidebar__heading {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--probabl-blue);
  padding-bottom: var(--space-2);
  border-bottom: 2px solid var(--probabl-orange);
  margin-bottom: var(--space-1);
}

/* ── Use-Case Grid ──────────────────────────────────────── */
.uc-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  padding: var(--space-5) var(--space-6);
}

.uc-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.uc-toolbar__left {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.uc-count {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--neutral-600);
}

.uc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--space-5);
}

/* ── Use-Case Card ──────────────────────────────────────── */
.uc-card {
  background: var(--bg-surface);
  border: 1.5px solid var(--neutral-200);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  position: relative;
  transition: border-color .18s, box-shadow .18s, transform .12s;
  cursor: default;
}

.uc-card:hover {
  border-color: var(--probabl-blue);
  box-shadow: 0 4px 24px rgba(30,34,170,.12);
  transform: translateY(-2px);
}

.uc-card__difficulty {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
}

.difficulty-badge {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: var(--tracking-wider);
  text-transform: uppercase;
  padding: 3px 8px;
  border-radius: var(--radius-full);
}

.difficulty-badge--beginner {
  background: #dcfce7;
  color: #15803d;
}

.difficulty-badge--intermediate {
  background: #fef9c3;
  color: #92400e;
}

.difficulty-badge--advanced {
  background: #fee2e2;
  color: #991b1b;
}

.uc-card__title {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--probabl-blue);
  line-height: 1.3;
  padding-right: 80px; /* avoid overlap with difficulty badge */
}

.uc-card__synopsis {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--neutral-700);
  line-height: 1.6;
  -webkit-box-orient: vertical;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  overflow: hidden;
}

/* Industry tags */
.uc-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.industry-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .03em;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  background: rgba(30,34,170,.08);
  color: var(--probabl-blue);
  border: 1px solid rgba(30,34,170,.2);
  cursor: pointer;
  transition: background .12s;
}

.industry-tag:hover,
.industry-tag.is-active {
  background: var(--probabl-blue);
  color: #fff;
}

.technique-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: .03em;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  background: rgba(246,141,46,.1);
  color: #c2640a;
  border: 1px solid rgba(246,141,46,.3);
  cursor: pointer;
  transition: background .12s;
}

.technique-tag:hover,
.technique-tag.is-active {
  background: var(--probabl-orange);
  color: var(--probabl-blue);
}

/* Package chips in use-case card */
.uc-card__packages {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-top: var(--space-1);
}

.uc-package-chip {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  padding: 2px 8px;
  background: var(--neutral-100);
  color: var(--neutral-700);
  border-radius: 4px;
  border: 1px solid var(--neutral-200);
  cursor: pointer;
  transition: background .12s, color .12s;
  white-space: nowrap;
}

.uc-package-chip:hover {
  background: var(--probabl-blue);
  color: #fff;
  border-color: var(--probabl-blue);
}

.uc-package-chip--core {
  background: rgba(246,141,46,.12);
  color: var(--probabl-blue);
  border-color: rgba(246,141,46,.3);
}

/* Card footer */
.uc-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-3);
  border-top: 1px solid var(--neutral-100);
  margin-top: auto;
  gap: var(--space-2);
}

.btn--view-code {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: .02em;
  padding: var(--space-2) var(--space-4);
  background: var(--probabl-blue);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-1);
  transition: background .15s;
}

.btn--view-code:hover {
  background: #161aa0;
}

/* ── Code Modal ─────────────────────────────────────────── */
.code-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(14,17,90,.55);
  backdrop-filter: blur(4px);
  z-index: 500;
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--space-6);
}

.code-modal-backdrop.is-open {
  display: flex;
}

.code-modal {
  background: var(--bg-surface);
  border-radius: var(--radius-xl);
  width: 100%;
  max-width: 780px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 24px 80px rgba(14,17,90,.35);
}

.code-modal__header {
  background: var(--probabl-blue);
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  flex-shrink: 0;
}

.code-modal__title {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--probabl-orange);
  line-height: 1.2;
}

.code-modal__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  margin-top: var(--space-2);
}

.code-modal__close {
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.2);
  color: #fff;
  font-size: 20px;
  line-height: 1;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background .12s;
}

.code-modal__close:hover {
  background: rgba(255,255,255,.22);
}

.code-modal__synopsis {
  padding: var(--space-4) var(--space-6);
  background: var(--neutral-050, #f8f8fc);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--neutral-700);
  line-height: 1.65;
  border-bottom: 1px solid var(--neutral-200);
  flex-shrink: 0;
}

.code-modal__body {
  flex: 1;
  overflow: auto;
  padding: 0;
}

/* Syntax-highlighted code block */
.code-modal__pre {
  margin: 0;
  padding: var(--space-5) var(--space-6);
  background: #1a1b2e;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.65;
  color: #e2e8f0;
  white-space: pre;
  min-height: 200px;
}

/* highlight.js overrides */
.hljs { background: #1a1b2e !important; }

.code-modal__footer {
  padding: var(--space-3) var(--space-6);
  border-top: 1px solid var(--neutral-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  flex-shrink: 0;
  background: var(--bg-surface);
}

.code-modal__packages-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--neutral-500);
  font-weight: 600;
}

.code-modal__package-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.btn--copy-code {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  padding: var(--space-2) var(--space-4);
  background: transparent;
  border: 1.5px solid var(--probabl-blue);
  color: var(--probabl-blue);
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-1);
  transition: background .12s, color .12s;
  flex-shrink: 0;
}

.btn--copy-code:hover {
  background: var(--probabl-blue);
  color: #fff;
}

/* ── Updated header for v3 (subtitle + actions) ─────────── */
.app-header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex: 1;
  min-width: 0;
}

.app-header__logo-wrap {
  flex-shrink: 0;
  width: 38px;
  height: 38px;
  background: var(--neutral-000);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4px;
}

.app-header__logo-wrap img {
  width: 30px;
  height: 30px;
  object-fit: contain;
}

.app-header__titles {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.app-header__subtitle {
  font-family: var(--font-mono);
  font-size: 10px;
  color: rgba(255,255,255,.5);
  letter-spacing: var(--tracking-wide);
}

.app-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

/* ── Cross-link: packages used count in catalog cards ──── */
.card__use-cases {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--probabl-orange);
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  text-decoration: none;
}

.card__use-cases:hover {
  text-decoration: underline;
}

/* ── Industry filter chips (active filters bar) ─────────── */
.uc-active-filters {
  display: none;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding: var(--space-2) 0;
}

.uc-active-filters.is-visible {
  display: flex;
}

/* ── Responsive: collapse sidebar on mobile ─────────────── */
@media (max-width: 900px) {
  .uc-grid {
    grid-template-columns: 1fr;
  }
  .code-modal {
    max-width: 100%;
    max-height: 100vh;
    border-radius: 0;
  }
}



/* ═══════════════════════════════════════════════════════════
   Scikit-learn Central v3 — Horizontal Filter Bar
   Replaces sidebar layout with an inline filter strip.
   ═══════════════════════════════════════════════════════════ */

/* ── Remove sidebar grid, use full-width content ─────────── */
#view-catalog .app-layout,
#view-use-cases .app-layout {
  display: block;
}

.page-content {
  max-width: 1440px;
  margin: 0 auto;
  padding: var(--space-6);
}

/* Widen catalog & uc grids now that sidebar is gone */
#view-catalog .catalog-grid {
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
}

#view-use-cases .uc-grid {
  grid-template-columns: repeat(auto-fill, minmax(330px, 1fr));
}

/* ── Filter Bar ───────────────────────────────────────────── */
.filter-bar {
  position: sticky;
  top: calc(var(--header-h) + 40px); /* below header + view-tabs */
  z-index: 180;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--neutral-200);
  box-shadow: 0 2px 10px rgba(14,17,90,.07);
}

.filter-bar__inner {
  max-width: 1440px;
  margin: 0 auto;
  padding: var(--space-3) var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.filter-bar__search {
  flex: 1;
  min-width: 180px;
  max-width: 280px;
  position: relative;
}

.filter-bar__search-icon {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--neutral-400);
  font-size: 13px;
  pointer-events: none;
}

.filter-bar__search .search-input {
  padding-left: 30px;
  height: 36px;
  font-size: var(--text-sm);
}

.filter-bar__groups {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  flex: 1;
}

.filter-bar__end {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
}

/* ── Filter Pill Button ───────────────────────────────────── */
.filter-group {
  position: relative;
}

.filter-btn {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: .02em;
  padding: 0 14px;
  height: 34px;
  border: 1.5px solid var(--neutral-300);
  background: var(--bg-surface);
  color: var(--neutral-700);
  border-radius: var(--radius-full);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  transition: border-color .14s, background .14s, color .14s;
  user-select: none;
}

.filter-btn:hover {
  border-color: var(--probabl-blue);
  color: var(--probabl-blue);
}

.filter-btn.has-active {
  background: var(--probabl-blue);
  border-color: var(--probabl-blue);
  color: #fff;
}

.filter-btn.is-open {
  border-color: var(--probabl-blue);
  color: var(--probabl-blue);
  background: rgba(30,34,170,.06);
}

.filter-btn.has-active.is-open {
  background: #161aa0;
  color: #fff;
}

.filter-btn__badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  background: var(--probabl-orange);
  color: var(--probabl-blue);
  border-radius: 9px;
  font-size: 10px;
  font-weight: 800;
  line-height: 1;
}

.filter-btn .fa-chevron-down {
  font-size: 9px;
  transition: transform .15s;
}

.filter-btn.is-open .fa-chevron-down {
  transform: rotate(180deg);
}

/* ── Filter Dropdown Panel ────────────────────────────────── */
.filter-panel {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  min-width: 200px;
  max-height: 300px;
  overflow-y: auto;
  background: var(--bg-surface);
  border: 1.5px solid var(--neutral-200);
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 32px rgba(14,17,90,.14);
  z-index: 300;
  padding: var(--space-2) 0;
  scrollbar-width: thin;
  scrollbar-color: var(--neutral-300) transparent;
}

.filter-panel.is-open {
  display: block;
}

/* Wider panel for long labels */
.filter-panel--wide {
  min-width: 240px;
}

.filter-panel__item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-4);
  cursor: pointer;
  transition: background .1s;
  gap: var(--space-3);
}

.filter-panel__item:hover {
  background: var(--neutral-050, #f8f8fc);
}

.filter-panel__item input[type="checkbox"] {
  accent-color: var(--probabl-blue);
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

.filter-panel__label {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--neutral-700);
  flex: 1;
}

.filter-panel__count {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--neutral-400);
  min-width: 20px;
  text-align: right;
}

/* ── Inline sort select ───────────────────────────────────── */
.sort-select--inline {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  height: 34px;
  padding: 0 30px 0 12px;
  border: 1.5px solid var(--neutral-300);
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  color: var(--neutral-700);
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%236b7280'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  transition: border-color .14s;
}

.sort-select--inline:hover,
.sort-select--inline:focus {
  border-color: var(--probabl-blue);
  outline: none;
}

/* ── Clear-all button ─────────────────────────────────────── */
.filter-bar__clear {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--neutral-500);
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0 var(--space-2);
  white-space: nowrap;
  text-decoration: underline;
  display: none;
}

.filter-bar__clear.is-visible {
  display: inline;
}

.filter-bar__clear:hover {
  color: var(--probabl-blue);
}

/* ── Active filter chips below the filter bar ─────────────── */
.chips-bar {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--space-6) var(--space-2);
  display: none;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.chips-bar.is-visible {
  display: flex;
}

/* ── Stats strip — full width in new layout ───────────────── */
.stats-strip {
  margin: 0 0 var(--space-5);
}

/* ── Updated hero section spacing ────────────────────────── */
.page-content .sklearn-hero {
  margin-bottom: var(--space-6);
}

/* ── UC toolbar — simpler in new layout ──────────────────── */
.uc-toolbar {
  margin-bottom: var(--space-4);
}

/* ── Context-aware submit button label ───────────────────── */
#btn-submit-label { pointer-events: none; }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 768px) {
  .filter-bar__search {
    max-width: 100%;
    width: 100%;
  }
  .filter-bar__end {
    margin-left: 0;
  }
  .filter-bar__inner {
    padding: var(--space-2) var(--space-4);
  }
  .page-content {
    padding: var(--space-4);
  }
}