:root {
  --sky: #3DBDE8;
  --sky-dark: #0e8fbd;
  --sky-light: #e8f6fd;
  --navy: #0a2f4e;
  --yellow: #ffd13f;
  --slate-950: #101827;
  --slate-800: #1f2937;
  --slate-600: #475569;
  --slate-200: #e2e8f0;
  --slate-100: #f1f5f9;
  --slate-50: #f8fafc;
  --white: #ffffff;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: linear-gradient(180deg, var(--sky-light) 0, var(--slate-50) 260px);
  color: var(--slate-800);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
}

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

a:hover {
  color: var(--navy);
}

a:focus-visible {
  border-radius: 6px;
  outline: 3px solid var(--sky);
  outline-offset: 4px;
}

.global-disclaimer {
  background: var(--navy);
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.78rem;
  font-weight: 700;
  overflow: hidden;
  padding: 6px clamp(12px, 3vw, 40px);
  text-align: center;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.site-nav {
  align-items: center;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid rgba(148, 163, 184, 0.25);
  display: flex;
  justify-content: space-between;
  left: 0;
  padding: 10px clamp(18px, 4vw, 56px);
  position: sticky;
  right: 0;
  top: 0;
  z-index: 10;
}

.site-nav__brand {
  align-items: center;
  color: var(--navy);
  display: flex;
  font-weight: 800;
  gap: 12px;
}

.site-nav__brand img,
.brand-lockup img {
  border-radius: 6px;
  height: 42px;
  object-fit: cover;
  width: 42px;
}

.site-nav__links {
  display: flex;
  gap: 18px;
  font-size: 0.95rem;
  font-weight: 700;
}

main {
  overflow: hidden;
}

.hero {
  margin: 0 auto;
  max-width: 1180px;
  padding: 24px clamp(18px, 4vw, 32px) 8px;
}

.brand-lockup {
  align-items: center;
  color: var(--navy);
  display: inline-flex;
  font-weight: 800;
  gap: 12px;
  margin-bottom: 8px;
}

.eyebrow {
  color: var(--sky);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  margin: 0 0 6px;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  color: var(--navy);
  font-size: clamp(2rem, 4vw, 3.25rem);
  line-height: 1.04;
  margin-bottom: 10px;
  max-width: 720px;
}

h1 span {
  color: var(--sky);
}

.notice {
  border-radius: 8px;
  font-size: 0.78rem;
  font-weight: 750;
  max-width: 760px;
  padding: 7px 10px;
}

.hero__image {
  border-radius: 8px;
  box-shadow: 0 14px 32px rgba(15, 23, 42, 0.12);
  display: block;
  height: auto;
  margin: 0 auto;
  max-height: 520px;
  max-width: 100%;
  object-fit: contain;
  width: auto;
}

.summary-hero {
  align-items: end;
  display: grid;
  gap: 24px;
  grid-template-columns: 0.75fr 1.25fr;
  margin: 0 auto;
  max-width: 1180px;
  padding: 8px clamp(18px, 4vw, 32px) 10px;
}

.summary-hero h1 {
  font-size: clamp(2rem, 4vw, 3.1rem);
  margin-bottom: 0;
}

.summary-hero p:last-child {
  color: var(--slate-600);
  font-size: 0.95rem;
  margin-bottom: 0;
}

.notice-panel,
.summary-hero,
.toc-section,
.ask-section,
.category-grid,
.method-section,
.counts-section,
.review-links,
.faq-section,
.intro,
.reviews,
.static-page {
  margin: 0 auto;
  max-width: 1180px;
  padding-left: clamp(18px, 4vw, 32px);
  padding-right: clamp(18px, 4vw, 32px);
}

.notice-panel {
  padding-bottom: 8px;
  padding-top: 8px;
}

.notice-panel p {
  background: var(--sky-light);
  border: 1px solid rgba(61, 189, 232, 0.35);
  border-radius: 8px;
  color: var(--slate-600);
  font-size: 0.92rem;
  margin: 0;
  padding: 14px 16px;
}

.ask-section {
  padding-bottom: 18px;
  padding-top: 18px;
}

.ask-panel {
  background: var(--white);
  border: 1px solid rgba(61, 189, 232, 0.34);
  border-radius: 8px;
  box-shadow: 0 14px 32px rgba(15, 23, 42, 0.1);
  display: grid;
  gap: 18px;
  grid-template-columns: minmax(0, 0.85fr) minmax(320px, 1.15fr);
  padding: 24px;
}

.ask-panel h2 {
  color: var(--navy);
  font-size: clamp(1.55rem, 3vw, 2.35rem);
  line-height: 1.08;
  margin-bottom: 10px;
}

.ask-panel p {
  color: var(--slate-600);
  margin-bottom: 0;
}

.ask-form {
  display: grid;
  gap: 10px;
}

.ask-form label {
  color: var(--navy);
  font-weight: 900;
}

.ask-form textarea {
  border: 1px solid var(--slate-200);
  border-radius: 8px;
  color: var(--slate-800);
  font: inherit;
  min-height: 118px;
  padding: 12px 14px;
  resize: vertical;
}

.ask-form textarea:focus {
  border-color: var(--sky);
  box-shadow: 0 0 0 3px rgba(61, 189, 232, 0.2);
  outline: none;
}

.ask-form button {
  background: var(--sky-dark);
  border: 0;
  border-radius: 8px;
  color: var(--white);
  cursor: pointer;
  font: inherit;
  font-weight: 900;
  padding: 12px 16px;
}

.ask-form button:hover,
.ask-form button:focus-visible {
  background: var(--navy);
}

.ask-form button:disabled {
  cursor: wait;
  opacity: 0.68;
}

.ask-status {
  font-size: 0.9rem;
  font-weight: 800;
}

.ask-answer {
  background: var(--sky-light);
  border-left: 5px solid var(--yellow);
  border-radius: 8px;
  color: var(--slate-800);
  grid-column: 1 / -1;
  padding: 16px 18px;
  white-space: pre-wrap;
}

.section-heading {
  margin-bottom: 18px;
  max-width: 820px;
}

.section-heading h2 {
  color: var(--navy);
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  line-height: 1.08;
  margin-bottom: 0;
}

.category-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  padding-bottom: 24px;
  padding-top: 26px;
}

.section-heading {
  grid-column: 1 / -1;
}

.toc-section {
  padding-bottom: 12px;
  padding-top: 20px;
}

.toc-grid,
.method-grid,
.faq-list {
  display: grid;
  gap: 12px;
}

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

.toc-grid a,
.method-grid article,
.faq-list details,
.static-page,
.inline-category-links,
.source-mini-strip {
  background: var(--white);
  border: 1px solid var(--slate-200);
  border-radius: 8px;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.08);
}

.toc-grid a {
  color: var(--navy);
  font-weight: 900;
  padding: 14px 16px;
}

.summary-card,
.count-card,
.review-link,
.source-logo-card {
  background: var(--white);
  border: 1px solid var(--slate-200);
  border-radius: 8px;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.08);
}

.summary-card {
  padding: 22px;
}

.summary-card h3 {
  color: var(--navy);
  font-size: 1.25rem;
  margin-bottom: 10px;
}

.summary-card p {
  color: var(--slate-600);
  margin-bottom: 14px;
}

.summary-card ul {
  color: var(--slate-800);
  margin: 0;
  padding-left: 18px;
}

.summary-card li + li {
  margin-top: 6px;
}

.summary-card__link {
  display: inline-block;
  font-weight: 900;
  margin-top: 16px;
}

.detail-hero,
.detail-layout,
.source-mini-strip,
.related-categories {
  margin: 0 auto;
  max-width: 1180px;
  padding-left: clamp(18px, 4vw, 32px);
  padding-right: clamp(18px, 4vw, 32px);
}

.detail-hero {
  padding-bottom: 18px;
  padding-top: 34px;
}

.back-link {
  display: inline-block;
  font-weight: 900;
  margin-bottom: 18px;
}

.detail-hero h1 {
  font-size: clamp(2.35rem, 5vw, 4.8rem);
  margin-bottom: 14px;
}

.detail-hero p:last-child {
  color: var(--slate-600);
  font-size: 1.08rem;
  max-width: 820px;
}

.source-mini-strip {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
  padding-bottom: 14px;
  padding-top: 14px;
}

.source-mini-strip > span,
.inline-category-links strong {
  color: var(--slate-600);
  font-size: 0.86rem;
  font-weight: 900;
  text-transform: uppercase;
}

.source-mini-strip a,
.inline-category-links a,
.snippet-panel__source {
  align-items: center;
  display: inline-flex;
  font-weight: 900;
  gap: 8px;
}

.source-logo--small {
  flex-basis: 30px;
  font-size: 0.76rem;
  height: 30px;
  width: 30px;
}

.detail-layout {
  align-items: start;
  display: grid;
  gap: 22px;
  grid-template-columns: minmax(0, 1fr) 340px;
  padding-bottom: 30px;
}

.detail-article,
.snippet-panel {
  background: var(--white);
  border: 1px solid var(--slate-200);
  border-radius: 8px;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.08);
}

.detail-article {
  padding: 30px;
}

.detail-article p {
  color: var(--slate-800);
  font-size: 1.04rem;
  margin-bottom: 20px;
}

.detail-article p:last-child {
  margin-bottom: 0;
}

.inline-category-links {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
  padding: 14px 16px;
}

.snippet-panel {
  padding: 22px;
  position: sticky;
  top: 86px;
}

.snippet-panel h2 {
  color: var(--navy);
  font-size: 1.35rem;
  margin-bottom: 8px;
}

.snippet-panel p {
  color: var(--slate-600);
  font-size: 0.92rem;
  margin-bottom: 14px;
}

.snippet-panel ul {
  margin: 0;
  padding-left: 18px;
}

.snippet-panel li {
  color: var(--slate-800);
  font-weight: 800;
  line-height: 1.35;
}

.snippet-panel li + li {
  margin-top: 8px;
}

.snippet-panel__source {
  margin-top: 18px;
}

.related-categories {
  padding-bottom: 44px;
  padding-top: 8px;
}

.related-grid {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.related-grid a {
  background: var(--white);
  border: 1px solid var(--slate-200);
  border-radius: 8px;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.08);
  color: var(--navy);
  font-weight: 900;
  padding: 14px 16px;
}

.counts-section {
  padding-bottom: 22px;
  padding-top: 12px;
}

.source-logo-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.source-logo-card {
  align-items: center;
  display: flex;
  gap: 12px;
  min-height: 82px;
  padding: 16px;
}

.source-logo {
  align-items: center;
  background: var(--navy);
  border-radius: 8px;
  color: var(--white);
  display: flex;
  flex: 0 0 44px;
  font-weight: 900;
  height: 44px;
  justify-content: center;
  width: 44px;
}

.source-logo-card strong {
  color: var(--navy);
  display: block;
  font-weight: 900;
}

.source-logo-card small {
  color: var(--slate-600);
  display: block;
  font-size: 0.82rem;
  line-height: 1.25;
  margin-top: 2px;
}

.count-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.count-card {
  padding: 18px;
}

.count-card span {
  color: var(--slate-600);
  display: block;
  font-size: 0.86rem;
  font-weight: 800;
}

.count-card strong {
  color: var(--navy);
  display: block;
  font-size: 2rem;
  line-height: 1;
  margin-top: 8px;
}

.count-card--total {
  background: var(--navy);
  border-color: var(--navy);
}

.count-card--total span,
.count-card--total strong {
  color: var(--white);
}

.data-note {
  color: var(--slate-600);
  font-size: 0.9rem;
  margin: 12px 0 0;
}

.review-links {
  padding-bottom: 26px;
  padding-top: 18px;
}

.method-section {
  padding-bottom: 22px;
  padding-top: 4px;
}

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

.method-grid article {
  padding: 18px;
}

.method-grid h3 {
  color: var(--navy);
  font-size: 1.04rem;
  margin-bottom: 8px;
}

.method-grid p {
  color: var(--slate-600);
  font-size: 0.94rem;
  margin-bottom: 0;
}

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

.review-link {
  align-items: center;
  display: flex;
  justify-content: space-between;
  padding: 16px 18px;
}

.review-link strong {
  color: var(--navy);
  display: block;
  font-weight: 900;
}

.review-link small {
  color: var(--slate-600);
  display: block;
  font-size: 0.85rem;
  margin-top: 2px;
}

.review-link em {
  color: var(--sky-dark);
  font-style: normal;
  font-weight: 900;
  text-align: right;
}

.intro {
  align-items: end;
  display: grid;
  gap: 28px;
  grid-template-columns: 0.85fr 1.15fr;
  padding-bottom: 44px;
  padding-top: 20px;
}

.intro h2 {
  color: var(--navy);
  font-size: clamp(1.7rem, 3vw, 2.6rem);
  line-height: 1.04;
  margin-bottom: 0;
}

.intro p:last-child {
  color: var(--slate-600);
  font-size: 1.04rem;
  margin-bottom: 0;
}

.faq-section {
  padding-bottom: 34px;
  padding-top: 10px;
}

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

.faq-list details {
  padding: 16px 18px;
}

.faq-list summary {
  color: var(--navy);
  cursor: pointer;
  font-weight: 900;
}

.faq-list p {
  color: var(--slate-600);
  margin: 10px 0 0;
}

.static-page {
  margin-bottom: 46px;
  margin-top: 34px;
  padding-bottom: 34px;
  padding-top: 34px;
}

.static-page h1 {
  margin-bottom: 18px;
}

.static-page h2 {
  color: var(--navy);
  margin-bottom: 8px;
  margin-top: 26px;
}

.static-page p,
.static-page li {
  color: var(--slate-600);
}

.static-page ul {
  margin-bottom: 0;
  padding-left: 20px;
}

.site-footer {
  background: var(--navy);
  color: rgba(255, 255, 255, 0.78);
  padding: 28px clamp(18px, 4vw, 56px);
}

.site-footer a {
  color: var(--white);
  font-weight: 800;
}

.site-footer p {
  margin: 0;
}

.footer-links {
  display: inline-flex;
  gap: 12px;
  margin-left: 10px;
}

@media (max-width: 820px) {
  .site-nav {
    align-items: center;
    gap: 12px;
  }

  .site-nav__links {
    gap: 12px;
  }

  .hero {
    padding-top: 18px;
  }

  .summary-hero {
    align-items: start;
    grid-template-columns: 1fr;
  }

  .ask-panel {
    grid-template-columns: 1fr;
  }

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

  .toc-grid,
  .method-grid,
  .faq-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

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

  .snippet-panel {
    position: static;
  }

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

@media (max-width: 640px) {
  .global-disclaimer {
    font-size: 0.72rem;
    line-height: 1.35;
    padding: 7px 14px;
    text-overflow: clip;
    white-space: normal;
  }

  .site-nav {
    align-items: flex-start;
    gap: 10px;
    padding: 10px 14px;
  }

  .site-nav__brand {
    gap: 9px;
    min-width: 0;
  }

  .site-nav__brand img,
  .brand-lockup img {
    height: 34px;
    width: 34px;
  }

  .site-nav__brand span {
    overflow-wrap: anywhere;
  }

  .site-nav__links {
    flex: 0 0 auto;
    gap: 10px;
  }

  .hero,
  .summary-hero,
  .notice-panel,
  .toc-section,
  .ask-section,
  .category-grid,
  .method-section,
  .counts-section,
  .review-links,
  .faq-section,
  .detail-hero,
  .detail-layout,
  .source-mini-strip,
  .related-categories,
  .intro,
  .reviews,
  .static-page {
    padding-left: 14px;
    padding-right: 14px;
  }

  .hero {
    padding-bottom: 4px;
  }

  .brand-lockup {
    margin-bottom: 10px;
  }

  .eyebrow {
    font-size: 0.7rem;
    line-height: 1.35;
  }

  h1 {
    font-size: 2rem;
    line-height: 1.08;
  }

  .notice {
    font-size: 0.72rem;
    line-height: 1.4;
  }

  .hero__image {
    border-radius: 6px;
    max-height: none;
    width: 100%;
  }

  .summary-hero {
    gap: 8px;
    padding-top: 8px;
  }

  .ask-panel {
    padding: 18px 16px;
  }

  .category-grid,
  .toc-grid,
  .method-grid,
  .faq-list,
  .count-grid,
  .source-logo-grid {
    grid-template-columns: 1fr;
  }

  .summary-card {
    padding: 18px 16px;
  }

  .detail-article,
  .snippet-panel {
    padding: 18px 16px;
  }

  .detail-article p {
    font-size: 0.98rem;
  }

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

  .review-link {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  .review-link em {
    text-align: left;
  }

  .intro {
    gap: 12px;
    grid-template-columns: 1fr;
    padding-bottom: 32px;
  }

  .intro h2 {
    font-size: 1.55rem;
  }

  .intro p:last-child {
    font-size: 0.96rem;
  }

  .site-footer {
    font-size: 0.86rem;
    padding: 22px 14px;
  }

  .footer-links {
    display: flex;
    margin-left: 0;
    margin-top: 10px;
  }
}

@media (max-width: 420px) {
  .site-nav__brand span {
    max-width: 128px;
  }

  .site-nav__links {
    font-size: 0.84rem;
  }

  h1 {
    font-size: 1.75rem;
  }

}