:root {
  --primary-color: #5b6aff;
  --secondary-color: #8c54ff;
  --accent-color: #667eea;
  --bg-primary: #ffffff;
  --bg-secondary: #f5f7fa;
  --bg-card: #ffffff;
  --text-primary: #333333;
  --text-secondary: #666666;
  --text-muted: #999999;
  --border-color: rgba(91, 106, 255, 0.12);
  --shadow-soft: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-float: 0 14px 36px rgba(91, 106, 255, 0.18);
  --radius: 12px;
  --nav-height: 64px;
  --sidebar-width: 240px;
  --transition-base: 0.3s ease;
}

html[data-theme="dark"] {
  --bg-primary: #0f1220;
  --bg-secondary: #171b30;
  --bg-card: #1d2238;
  --text-primary: #f2f5ff;
  --text-secondary: #bac3dd;
  --text-muted: #8c96b7;
  --border-color: rgba(255, 255, 255, 0.08);
  --shadow-soft: 0 10px 26px rgba(0, 0, 0, 0.24);
  --shadow-float: 0 22px 44px rgba(0, 0, 0, 0.3);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body {
  background:
    radial-gradient(circle at top left, rgba(91, 106, 255, 0.16), transparent 28%),
    radial-gradient(circle at top right, rgba(140, 84, 255, 0.14), transparent 24%),
    var(--bg-primary);
}

body.sidebar-open {
  overflow: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

.app-shell {
  min-height: 100vh;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: grid;
  grid-template-columns: auto minmax(320px, 640px) auto;
  align-items: center;
  gap: 16px;
  min-height: var(--nav-height);
  padding: 12px 24px;
  background: color-mix(in srgb, var(--bg-primary) 84%, transparent);
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(16px);
}

.brand,
.brand-link,
.search-shell,
.topbar-actions,
.hero-actions,
.hero-metrics,
.toolbar,
.card-top,
.card-footer,
.card-meta,
.card-badges,
.section-head,
.category-item {
  display: flex;
  align-items: center;
}

.brand {
  gap: 12px;
}

.brand-link {
  gap: 12px;
}

.brand-mark,
.card-icon,
.empty-icon {
  display: grid;
  place-items: center;
}

.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: #fff;
  font-weight: 700;
  box-shadow: var(--shadow-soft);
}

.brand-copy {
  display: grid;
  gap: 2px;
}

.brand-copy small,
.toolbar p,
.card-description,
.card-meta,
.sidebar-foot,
.hero-copy p {
  color: var(--text-secondary);
}

.search-shell {
  gap: 10px;
  height: 48px;
  padding: 0 14px;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  background: color-mix(in srgb, var(--bg-card) 90%, transparent);
  box-shadow: var(--shadow-soft);
}

.search-shell input {
  flex: 1;
  min-width: 0;
  border: 0;
  background: transparent;
  color: var(--text-primary);
  outline: none;
}

.search-clear,
.top-link,
.ghost-button,
.card-link,
.icon-button {
  border: 1px solid var(--border-color);
  border-radius: 999px;
  background: color-mix(in srgb, var(--bg-card) 92%, transparent);
  color: var(--text-secondary);
  transition: transform var(--transition-base), border-color var(--transition-base), color var(--transition-base);
}

.search-clear,
.top-link,
.ghost-button,
.card-link,
.icon-button,
.primary-button {
  padding: 10px 14px;
}

.topbar-actions {
  justify-content: flex-end;
  gap: 10px;
}

.icon-button:hover,
.top-link:hover,
.ghost-button:hover,
.card-link:hover,
.search-clear:hover,
.primary-button:hover,
.tool-card:hover {
  transform: translateY(-2px);
}

.primary-button,
.card-action {
  border-radius: 999px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: #fff;
  box-shadow: var(--shadow-soft);
}

.primary-button {
  padding: 12px 18px;
}

.mobile-only {
  display: none;
}

#sidebarToggle {
  width: 42px;
  height: 42px;
  padding: 0;
  flex-direction: column;
  gap: 4px;
}

#sidebarToggle span {
  width: 16px;
  height: 2px;
  background: currentColor;
}

.sidebar-backdrop {
  position: fixed;
  inset: 0;
  z-index: 20;
  border: 0;
  background: rgba(9, 12, 22, 0.46);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.sidebar-backdrop.is-visible {
  opacity: 1;
  pointer-events: auto;
}

.layout {
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
}

.sidebar {
  position: sticky;
  top: var(--nav-height);
  height: calc(100vh - var(--nav-height));
  padding: 24px 16px 24px 24px;
}

.sidebar-panel,
.hero,
.featured-strip,
.tool-card,
.empty-state {
  border: 1px solid var(--border-color);
  background: color-mix(in srgb, var(--bg-card) 92%, transparent);
  box-shadow: var(--shadow-soft);
}

.sidebar-panel,
.hero,
.featured-strip,
.tool-card,
.empty-state {
  border-radius: 24px;
}

.sidebar-panel {
  display: flex;
  flex-direction: column;
  gap: 18px;
  height: 100%;
  padding: 20px 16px;
}

.sidebar-kicker {
  margin: 0 0 6px;
  color: var(--primary-color);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.sidebar-head h2,
.section-head h2,
.toolbar h2,
.hero h1,
.empty-state h3,
.card-title {
  margin: 0;
}

.category-nav {
  display: grid;
  gap: 10px;
}

.category-item {
  justify-content: flex-start;
  gap: 10px;
  width: 100%;
  padding: 12px 14px;
  border: 1px solid transparent;
  border-radius: 16px;
  background: transparent;
  color: var(--text-secondary);
  text-align: left;
}

.category-item.is-active {
  background: linear-gradient(135deg, rgba(91, 106, 255, 0.14), rgba(140, 84, 255, 0.08));
  border-color: rgba(91, 106, 255, 0.18);
  color: var(--text-primary);
}

.category-name {
  flex: 1;
}

.category-count,
.card-category,
.card-featured,
.featured-pill {
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
}

.category-count,
.card-category {
  background: color-mix(in srgb, var(--bg-secondary) 90%, transparent);
  color: var(--text-secondary);
}

.card-featured,
.featured-pill {
  background: rgba(255, 197, 61, 0.18);
  color: #bf7a00;
}

.sidebar-foot {
  margin-top: auto;
  padding: 16px;
  border-radius: 18px;
  background: color-mix(in srgb, var(--bg-secondary) 88%, transparent);
  line-height: 1.7;
}

.content {
  padding: 24px;
}

.notice-banner {
  margin-bottom: 16px;
  padding: 14px 18px;
  border: 1px solid rgba(255, 193, 7, 0.28);
  border-radius: 18px;
  background: rgba(255, 244, 214, 0.9);
  color: #8a5a00;
  line-height: 1.7;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: 24px;
  padding: 28px;
  margin-bottom: 24px;
}

.hero h1 {
  max-width: 760px;
  font-size: clamp(2rem, 3.4vw, 4rem);
  line-height: 1.1;
}

.hero-actions {
  gap: 12px;
  margin-top: 20px;
}

.hero-metrics {
  gap: 14px;
  flex-wrap: wrap;
  align-content: flex-start;
  justify-content: flex-end;
}

.metric-card,
.featured-card {
  border: 1px solid var(--border-color);
  border-radius: 20px;
  background: color-mix(in srgb, var(--bg-card) 96%, transparent);
}

.metric-card {
  min-width: 132px;
  padding: 18px;
  text-align: center;
}

.metric-card strong {
  display: block;
  font-size: 2rem;
  margin-bottom: 6px;
}

.featured-strip {
  padding: 24px;
  margin-bottom: 24px;
}

.section-head,
.toolbar {
  justify-content: space-between;
  gap: 16px;
}

.text-link {
  color: var(--primary-color);
  font-weight: 600;
}

.featured-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.featured-card {
  display: grid;
  gap: 12px;
  padding: 16px;
}

.featured-card h3,
.featured-card p {
  margin: 0;
}

.featured-card p {
  color: var(--text-secondary);
  line-height: 1.6;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.tool-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 22px;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.tool-card:hover {
  box-shadow: var(--shadow-float);
}

.card-top,
.card-footer,
.card-meta {
  justify-content: space-between;
  gap: 10px;
}

.card-badges {
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(91, 106, 255, 0.14), rgba(140, 84, 255, 0.18));
  color: var(--primary-color);
  font-size: 22px;
  font-weight: 700;
}

.card-description {
  flex: 1;
  line-height: 1.72;
}

.card-meta {
  font-size: 14px;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.card-tag {
  padding: 6px 10px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--primary-color) 10%, transparent);
  color: var(--primary-color);
  font-size: 12px;
}

.card-action {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  padding: 11px 16px;
}

.empty-state {
  padding: 48px 24px;
  text-align: center;
}

.empty-icon {
  width: 70px;
  height: 70px;
  border-radius: 50%;
  margin: 0 auto 14px;
  background: rgba(91, 106, 255, 0.12);
  color: var(--primary-color);
  font-size: 28px;
}

@media (max-width: 1024px) {
  .topbar {
    grid-template-columns: auto minmax(0, 1fr) auto;
  }

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

  .hero-metrics {
    justify-content: flex-start;
  }

  .card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 768px) {
  .topbar {
    grid-template-columns: 1fr auto;
    padding: 16px;
  }

  .mobile-only {
    display: inline-flex;
  }

  .search-shell {
    grid-column: 1 / -1;
    order: 3;
  }

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

  .sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 25;
    width: min(86vw, 320px);
    height: 100dvh;
    padding: 16px;
    transform: translateX(-110%);
    transition: transform var(--transition-base);
  }

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

  .content {
    padding: 16px;
  }

  .topbar-actions {
    flex-wrap: wrap;
    justify-content: flex-end;
  }

  .hero-actions,
  .toolbar,
  .card-footer {
    flex-direction: column;
    align-items: stretch;
  }

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