:root {
  color-scheme: dark;
  --bg-canvas: #0b0f14;
  --bg-surface: #111821;
  --bg-surface-raised: #16202b;
  --bg-accent-soft: #0f2b33;
  --text-primary: #ecf2f8;
  --text-secondary: #a3b4c7;
  --text-tertiary: #7c8ea1;
  --border-default: #213041;
  --border-strong: #2e445c;
  --accent: #3dd9c3;
  --accent-strong: #7ce9db;
  --shadow-soft: 0 18px 40px rgba(0, 0, 0, 0.24);
  --radius-lg: 24px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --max-width: 1200px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  background:
    radial-gradient(circle at top, rgba(61, 217, 195, 0.09), transparent 24%),
    var(--bg-canvas);
  color: var(--text-primary);
  line-height: 1.6;
}

a {
  color: inherit;
}

button,
input {
  font: inherit;
}

button {
  cursor: pointer;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -48px;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: #06211d;
  font-weight: 700;
  z-index: 10;
}

.skip-link:focus {
  top: 16px;
}

.site-shell {
  width: min(calc(100% - 32px), var(--max-width));
  margin: 0 auto;
  padding: 24px 0 48px;
}

.topbar,
.topbar-actions,
.section-heading,
.toolbar-header,
.category-header,
.card-footer,
.sponsor-panel,
.hero-actions,
.article-hero-meta,
.breadcrumb {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.topbar {
  padding: 8px 4px 20px;
}

.topbar h1,
.hero h2,
.section-heading h2,
.category-header h3,
.sponsor-panel h2,
.article-hero h2,
.article-content h3,
.empty-panel h2,
.empty-panel h3 {
  margin: 0;
  letter-spacing: -0.03em;
}

.topbar h1 {
  font-size: clamp(1.75rem, 2.5vw, 2.5rem);
}

.eyebrow,
.section-label,
.tool-meta,
.article-meta,
.ad-caption,
.search-label,
.stat-label {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.75rem;
}

.eyebrow,
.section-label,
.tool-meta,
.article-meta,
.ad-caption,
.search-label,
.muted,
.stat-label,
.breadcrumb,
.breadcrumb a {
  color: var(--text-secondary);
}

.ghost-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-default);
  border-radius: 999px;
  text-decoration: none;
  transition: border-color 180ms ease, background-color 180ms ease;
}

.ghost-link:hover,
.ghost-link:focus-visible,
.secondary-button:hover,
.secondary-button:focus-visible,
.category-link:hover,
.category-link:focus-visible {
  border-color: var(--border-strong);
  background: rgba(255, 255, 255, 0.03);
}

.panel {
  padding: 24px;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  background: rgba(17, 24, 33, 0.92);
  box-shadow: var(--shadow-soft);
}

main {
  display: grid;
  gap: 20px;
}

.hero {
  display: grid;
  gap: 24px;
  grid-template-columns: 1.8fr 1fr;
  align-items: stretch;
}

.hero-copy,
.article-layout main,
.article-hero,
.article-content {
  display: grid;
  gap: 12px;
}

.hero h2,
.article-hero h2 {
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.05;
}

.hero h2 {
  max-width: 11ch;
}

.hero-text,
.article-content p,
.article-content li {
  margin: 0;
  color: var(--text-secondary);
}

.hero-actions,
.topbar-actions {
  flex-wrap: wrap;
  justify-content: flex-start;
}

.hero-meta {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.stat-card {
  padding: 20px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-default);
  background: linear-gradient(180deg, rgba(22, 32, 43, 0.95), rgba(17, 24, 33, 0.95));
}

.stat-card strong {
  display: block;
  margin-top: 12px;
  font-size: clamp(1.35rem, 3vw, 2.4rem);
  line-height: 1.2;
}

.search-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 12px;
  margin-top: 16px;
}

.search-field {
  display: grid;
  gap: 8px;
}

.search-field input {
  min-height: 52px;
  padding: 0 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-default);
  background: rgba(9, 13, 18, 0.96);
  color: var(--text-primary);
}

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

.search-field input:focus-visible,
.secondary-button:focus-visible,
.tool-link:focus-visible,
.ghost-link:focus-visible,
.category-link:focus-visible,
.breadcrumb a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.secondary-button,
.tool-link {
  min-height: 52px;
  padding: 0 18px;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text-primary);
  text-decoration: none;
  transition: transform 180ms ease, border-color 180ms ease, background-color 180ms ease;
}

.secondary-button {
  align-self: end;
}

.category-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 0;
  margin: 20px 0 0;
  list-style: none;
}

.category-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 14px;
  border: 1px solid var(--border-default);
  border-radius: 999px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: transform 180ms ease, border-color 180ms ease, background-color 180ms ease;
}

.featured-grid,
.tool-grid,
.article-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.tool-card,
.featured-card,
.article-card {
  display: grid;
  gap: 14px;
  min-height: 100%;
  padding: 20px;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  background: rgba(12, 17, 23, 0.92);
  transition: transform 180ms ease, border-color 180ms ease, background-color 180ms ease;
}

.tool-card:hover,
.tool-card:focus-within,
.featured-card:hover,
.featured-card:focus-within,
.article-card:hover,
.article-card:focus-within {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  background: rgba(16, 22, 30, 0.98);
}

.card-header {
  display: grid;
  gap: 8px;
}

.card-header h3,
.card-header h4,
.article-card-title {
  margin: 0;
  font-size: 1.15rem;
}

.card-copy {
  margin: 0;
  color: var(--text-secondary);
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  padding: 0.35rem 0.6rem;
  border-radius: 999px;
  background: var(--bg-accent-soft);
  color: var(--accent-strong);
  font-size: 0.82rem;
}

.card-footer {
  margin-top: auto;
  align-items: end;
}

.tool-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(61, 217, 195, 0.1);
  color: var(--accent-strong);
}

.tool-link:hover,
.tool-link:focus-visible {
  transform: translateY(-1px);
  border-color: rgba(61, 217, 195, 0.45);
  background: rgba(61, 217, 195, 0.16);
}

.category-sections {
  display: grid;
  gap: 16px;
}

.category-block {
  display: grid;
  gap: 18px;
  padding: 20px;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  background: rgba(10, 15, 21, 0.78);
}

.category-header {
  align-items: start;
}

.category-description {
  margin: 6px 0 0;
  color: var(--text-secondary);
}

.category-count {
  min-width: 44px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 12px;
  border-radius: 999px;
  background: rgba(61, 217, 195, 0.12);
  color: var(--accent-strong);
  font-weight: 700;
}

.ad-slot {
  display: grid;
  place-items: center;
  gap: 8px;
  min-height: 132px;
  padding: 20px;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-md);
  background: rgba(9, 16, 22, 0.88);
  text-align: center;
}

.ad-slot--hero {
  min-height: 148px;
}

.ad-title {
  margin: 0;
  font-size: 1.1rem;
}

.ad-description,
.empty-state {
  margin: 0;
  color: var(--text-secondary);
}

.article-layout {
  padding-bottom: 56px;
}

.breadcrumb {
  flex-wrap: wrap;
  justify-content: flex-start;
  font-size: 0.92rem;
  padding: 0 4px;
}

.breadcrumb a {
  text-decoration: none;
}

.article-hero {
  gap: 16px;
}

.article-hero-meta {
  flex-wrap: wrap;
  justify-content: flex-start;
}

.article-content {
  gap: 20px;
}

.article-content h3 {
  font-size: 1.3rem;
}

.article-content ul,
.article-content ol {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--text-secondary);
}

.article-card--compact {
  padding: 18px;
}

.sponsor-panel {
  margin-top: 20px;
  padding-top: 20px;
  align-items: stretch;
}

.sponsor-panel > * {
  flex: 1;
}

.site-footer {
  padding: 24px 4px 0;
  text-align: center;
}

.site-footer p {
  margin: 0;
}

.site-footer p + p {
  margin-top: 6px;
}

.empty-panel {
  padding: 24px;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius-md);
  background: rgba(9, 13, 18, 0.75);
}

@media (max-width: 1024px) {
  .hero,
  .sponsor-panel {
    grid-template-columns: 1fr;
    flex-direction: column;
  }

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

@media (max-width: 768px) {
  .site-shell {
    width: min(calc(100% - 20px), var(--max-width));
    padding-top: 16px;
  }

  .panel,
  .category-block,
  .tool-card,
  .featured-card,
  .article-card {
    padding: 18px;
  }

  .topbar,
  .topbar-actions,
  .section-heading,
  .toolbar-header,
  .category-header,
  .card-footer,
  .hero-actions,
  .article-hero-meta,
  .breadcrumb {
    align-items: start;
    flex-direction: column;
  }

  .hero-meta,
  .featured-grid,
  .tool-grid,
  .article-grid,
  .search-row {
    grid-template-columns: 1fr;
  }

  .secondary-button,
  .tool-link,
  .ghost-link,
  .category-link {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .hero h2,
  .article-hero h2 {
    max-width: none;
  }

  .topbar {
    gap: 12px;
  }
}