:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-soft: #f0f3f6;
  --surface-strong: #eef1f4;
  --ink: #0f1720;
  --muted: #607081;
  --line: #d9e0e8;
  --line-strong: #c7d0da;
  --brand: #111827;
  --brand-soft: #1f2937;
  --accent: #1d4ed8;
  --accent-soft: #dbeafe;
  --success: #e9f8ee;
  --shadow: 0 14px 38px rgba(15, 23, 32, 0.06);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Segoe UI", -apple-system, BlinkMacSystemFont, sans-serif;
  background:
    radial-gradient(circle at top right, rgba(37, 99, 235, 0.08), transparent 26%),
    linear-gradient(180deg, #f7f8fa 0%, #f3f6f9 30%, #f8fafc 100%);
  color: var(--ink);
  line-height: 1.6;
}

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

a:hover {
  text-decoration: none;
}

img {
  max-width: 100%;
  display: block;
}

.wrap {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header,
.site-footer {
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(14px);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid rgba(217, 224, 232, 0.85);
}

.header-row,
.footer-grid {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  padding: 18px 0;
}

.brand {
  color: var(--brand);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.main-nav {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
}

.nav-search {
  flex: 1;
  max-width: 360px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-search input {
  width: 100%;
  min-height: 42px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: #fff;
  padding: 0 14px;
  font: inherit;
}

.nav-search button {
  min-height: 42px;
  border-radius: 999px;
  border: 1px solid var(--brand);
  padding: 0 14px;
  background: var(--brand);
  color: #fff;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.main-nav a {
  color: var(--muted);
  padding: 10px 12px;
  border-radius: 999px;
  font-size: 0.95rem;
  transition: background-color 160ms ease, color 160ms ease;
}

.main-nav a:hover {
  background: var(--surface-soft);
  color: var(--brand);
}

.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 48px;
}

.footer-grid {
  align-items: flex-start;
  padding: 26px 0 34px;
}

.footer-grid > div {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.footer-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--brand);
}

.footer-grid p,
.footer-grid a {
  margin: 0;
  color: var(--muted);
}

.flash-stack {
  margin-top: 18px;
}

.flash {
  padding: 12px 16px;
  border: 1px solid #b7dec0;
  background: #eefcf1;
  border-radius: 14px;
}

.hero,
.section,
.detail-page {
  padding: 32px 0;
}

.hero-directory {
  padding: 38px 0 28px;
}

.hero-directory-grid,
.hero-grid,
.two-col,
.hero-panel,
.article-layout,
.split-promo {
  display: grid;
  grid-template-columns: minmax(0, 1.65fr) minmax(280px, 0.85fr);
  gap: 24px;
}

.hero-copy,
.hero-sidebar,
.hero-card,
.content-card,
.metric-card,
.directory-card,
.post-card,
.pricing-card,
.category-card,
.stack-card,
.card,
.list-card,
.promo-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 22px;
  box-shadow: var(--shadow);
}

.hero-copy {
  padding: 34px;
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.98), rgba(244, 248, 252, 0.97)),
    var(--surface);
}

.hero-copy h1,
.hero-panel h1 {
  margin: 0 0 14px;
  max-width: 12ch;
  font-size: clamp(2.4rem, 5vw, 4.3rem);
  line-height: 0.96;
  letter-spacing: -0.05em;
}

.lede {
  margin: 0;
  max-width: 62ch;
  color: var(--muted);
  font-size: 1.05rem;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.tag-chip {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 12px;
  border-radius: 999px;
  background: var(--surface-soft);
  border: 1px solid var(--line);
  color: var(--brand);
  font-size: 0.92rem;
  font-weight: 600;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: #fff;
  color: var(--brand);
  font-weight: 600;
  transition: transform 160ms ease, border-color 160ms ease, background-color 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
  border-color: #aab5c1;
}

.button-primary {
  background: var(--brand);
  border-color: var(--brand);
  color: #fff;
}

.button-primary:hover {
  border-color: var(--brand-soft);
  background: var(--brand-soft);
}

.text-link {
  color: var(--brand);
  font-weight: 700;
  white-space: nowrap;
}

.text-link:hover {
  color: var(--accent);
}

.hero-sidebar {
  display: grid;
  gap: 12px;
  padding: 18px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(240, 243, 246, 0.96));
}

.hero-stat {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.88);
}

.hero-stat strong {
  font-size: 2rem;
  line-height: 1;
  letter-spacing: -0.04em;
}

.hero-stat span {
  color: var(--muted);
  text-align: right;
  font-size: 0.92rem;
}

.section.alt {
  background: linear-gradient(180deg, rgba(237, 242, 247, 0.45), rgba(246, 247, 249, 0));
}

.section-head {
  margin-bottom: 18px;
}

.section-head h2,
.content-card h2,
.card-title,
.promo-panel h3,
.pricing-card h3,
.post-card h3,
.directory-card h3 {
  margin: 0;
  color: var(--brand);
  letter-spacing: -0.03em;
}

.section-head p,
.promo-panel p {
  margin: 10px 0 0;
  color: var(--muted);
}

.split-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
}

.tool-grid,
.post-grid,
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.directory-card,
.post-card,
.pricing-card,
.category-card {
  padding: 20px;
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.directory-card:hover,
.post-card:hover,
.pricing-card:hover,
.category-card:hover,
.stack-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 44px rgba(15, 23, 32, 0.09);
  border-color: #c3cfdb;
}

.directory-card p,
.post-card p,
.pricing-card p,
.category-card small {
  margin: 0;
  color: var(--muted);
}

.tool-card-rich {
  gap: 14px;
}

.tool-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 6px;
}

.tool-chip {
  display: inline-flex;
  align-items: center;
  min-height: 30px;
  padding: 0 10px;
  border-radius: 999px;
  background: #f4f7fa;
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 600;
}

.directory-card-top,
.pricing-top,
.panel-head,
.card-meta-row {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 12px;
}

.directory-card-top {
  margin-bottom: 18px;
}

.tool-mark {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--surface-soft);
  color: var(--brand);
  font-weight: 800;
}

.pricing-pill,
.badge,
.post-date {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--surface-soft);
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.card-meta-row {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.card-meta-row span,
.meta,
small {
  color: var(--muted);
}

.category-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  color: inherit;
}

.category-card strong {
  color: var(--brand);
}

.category-card-rich {
  min-height: 220px;
  justify-content: space-between;
}

.category-browser-page {
  padding-top: 20px;
}

.category-browser-shell {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

.category-browser-sidebar {
  position: sticky;
  top: 110px;
}

.category-browser-nav {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.category-browser-nav-link,
.category-browser-group-title {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.category-browser-nav-link {
  min-height: 48px;
  padding: 0 16px;
  border-radius: 14px;
  color: var(--muted);
  background: transparent;
  transition: background-color 160ms ease, color 160ms ease;
}

.category-browser-nav-link:hover,
.category-browser-nav-link.is-active {
  background: #e7f1e5;
  color: var(--brand);
}

.category-browser-icon {
  font-size: 0.95rem;
  color: inherit;
}

.category-browser-main {
  min-width: 0;
}

.category-browser-header {
  max-width: 560px;
  margin: 0 auto 28px;
  text-align: center;
}

.category-browser-header-left {
  max-width: none;
  margin: 0 0 28px;
  text-align: left;
}

.category-browser-header h1 {
  margin: 0;
  color: var(--brand);
  font-size: clamp(2.2rem, 4.4vw, 3.4rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
}

.category-browser-header p {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 1.04rem;
}

.category-browser-groups {
  display: flex;
  flex-direction: column;
  gap: 34px;
}

.category-browser-inline-section {
  padding: 0;
}

.category-browser-group {
  padding-top: 8px;
}

.category-browser-group + .category-browser-group {
  border-top: 1px solid #e4ddd2;
}

.category-browser-group-head {
  margin-bottom: 12px;
}

.category-browser-group-title h2 {
  margin: 0;
  color: var(--brand);
  font-size: 1.9rem;
  letter-spacing: -0.03em;
}

.category-browser-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0 22px;
}

.category-browser-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 56px;
  border-top: 1px solid #ece4d8;
  color: var(--brand);
}

.category-browser-item:hover {
  color: var(--accent);
}

.category-browser-item-label {
  font-size: 1.02rem;
}

.category-browser-item-count {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.split-promo {
  align-items: stretch;
}

.split-promo > div:first-child,
.promo-panel {
  padding: 28px;
  border-radius: 24px;
}

.split-promo > div:first-child {
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.promo-panel {
  background: linear-gradient(180deg, rgba(17, 24, 39, 0.98), rgba(31, 41, 55, 0.96));
  color: #fff;
}

.promo-panel .eyebrow {
  color: #93c5fd;
}

.promo-panel h3,
.promo-panel p,
.promo-panel a {
  color: #fff;
}

.hero-card,
.content-card,
.metric-card {
  padding: 24px;
}

.detail-page .hero-panel {
  align-items: start;
}

.category-hero {
  grid-template-columns: minmax(0, 1.75fr) minmax(300px, 0.85fr);
}

.category-hero-copy {
  padding: 10px 0;
}

.category-hero-side {
  position: relative;
  overflow: hidden;
}

.category-highlight {
  grid-template-columns: minmax(0, 1.4fr) minmax(290px, 0.85fr);
}

.category-highlight-summary {
  margin: 18px 0 0;
  color: #233242;
  font-size: 1.02rem;
}

.category-highlight-panel .stack-card-dark {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.14);
  color: #fff;
}

.category-highlight-panel .stack-card-dark strong,
.category-highlight-panel .stack-card-dark span {
  color: #fff;
}

.category-content-grid {
  grid-template-columns: minmax(0, 1.45fr) minmax(300px, 0.82fr);
  align-items: start;
}

.tool-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.tool-list-row {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(220px, 0.7fr);
  gap: 18px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

.tool-list-row:first-child {
  border-top: 0;
  padding-top: 0;
}

.tool-list-main {
  display: flex;
  gap: 18px;
}

.tool-list-main .directory-card-top {
  margin: 0;
  flex-shrink: 0;
}

.tool-list-copy {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.tool-list-copy h3 {
  margin: 0;
}

.tool-list-copy p {
  margin: 0;
  color: var(--muted);
}

.tool-list-side {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 12px;
}

.tool-list-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
}

.facts {
  margin: 0;
  display: grid;
  gap: 12px;
}

.facts div {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}

.facts div:last-child {
  border-bottom: 0;
}

.facts dt {
  color: var(--muted);
}

.facts dd {
  margin: 0;
  text-align: right;
  font-weight: 700;
}

.article-layout {
  grid-template-columns: minmax(0, 1.5fr) minmax(280px, 0.8fr);
}

.compare-head-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 20px;
}

.compare-tool-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
}

.compare-tool-card strong {
  color: var(--brand);
}

.compare-tool-card span {
  color: var(--muted);
}

.article-card {
  padding: 30px;
}

.article-card p {
  margin: 0 0 18px;
  font-size: 1.04rem;
  color: #25303b;
}

.article-side {
  padding: 24px;
}

.stack-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.stack-card {
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  color: inherit;
}

.stack-card strong {
  color: var(--brand);
}

.pricing-card {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.pricing-top strong {
  font-size: 1.2rem;
}

.pricing-top span {
  font-size: 2rem;
  line-height: 1;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--brand);
}

.clean-list {
  margin: 0;
  padding-left: 18px;
}

.clean-list li + li {
  margin-top: 8px;
}

.card-grid,
.metric-grid,
.list-grid,
.ops-grid {
  display: grid;
  gap: 18px;
}

.card-grid,
.metric-grid,
.list-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

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

.metric-grid-wide {
  grid-template-columns: repeat(6, minmax(0, 1fr));
}

.metric-card span {
  display: block;
  margin-top: 8px;
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.04em;
}

.mini-metric-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.mini-metric-list div,
.formset-card {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface-soft);
  padding: 14px;
}

.mini-metric-list span {
  display: block;
  font-size: 1.55rem;
  font-weight: 800;
}

.panel-head {
  margin-bottom: 16px;
}

.top-gap {
  margin-top: 18px;
}

.table-wrap {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table th,
.data-table td {
  padding: 12px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}

.data-table th {
  color: var(--muted);
  font-size: 0.84rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.data-table .winner {
  background: var(--success);
}

.form-card form p,
.field-block {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-card input,
.form-card textarea,
.form-card select,
.field-block input,
.field-block textarea,
.field-block select {
  width: 100%;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--line-strong);
  background: #fff;
  font: inherit;
  color: inherit;
}

.formset-stack {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.field-block label {
  font-size: 0.9rem;
  color: var(--muted);
}

.ops-page .hero-panel h1 {
  max-width: 14ch;
}

@media (max-width: 980px) {
  .tool-grid,
  .post-grid,
  .pricing-grid,
  .card-grid,
  .metric-grid,
  .list-grid,
  .metric-grid-wide {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .category-browser-shell {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .category-browser-sidebar {
    position: static;
  }

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

@media (max-width: 860px) {
  .header-row,
  .footer-grid,
  .hero-directory-grid,
  .hero-grid,
  .two-col,
  .hero-panel,
  .article-layout,
  .split-promo,
  .ops-grid,
  .mini-metric-list,
  .form-grid {
    display: grid;
    grid-template-columns: 1fr;
  }

  .main-nav {
    justify-content: flex-start;
  }

  .nav-search {
    max-width: none;
  }

  .hero-copy h1,
  .hero-panel h1 {
    max-width: none;
  }

  .compare-head-grid {
    grid-template-columns: 1fr;
  }

  .split-head,
  .directory-card-top,
  .pricing-top,
  .panel-head,
  .card-meta-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .category-highlight,
  .category-content-grid,
  .tool-list-row,
  .category-browser-shell {
    grid-template-columns: 1fr;
  }

  .tool-list-main {
    flex-direction: column;
    gap: 12px;
  }

  .tool-list-side,
  .tool-list-actions {
    align-items: flex-start;
    justify-content: flex-start;
  }

  .category-browser-sidebar {
    position: static;
  }
}

@media (max-width: 640px) {
  .wrap {
    width: min(100% - 24px, 1160px);
  }

  .tool-grid,
  .post-grid,
  .pricing-grid,
  .category-grid,
  .card-grid,
  .metric-grid,
  .list-grid,
  .metric-grid-wide,
  .category-browser-grid {
    grid-template-columns: 1fr;
  }

  .hero-copy,
  .hero-card,
  .content-card,
  .metric-card,
  .directory-card,
  .post-card,
  .pricing-card,
  .category-card,
  .split-promo > div:first-child,
  .promo-panel {
    padding: 20px;
  }
}