:root {
  --ink: #171b20;
  --blue: #125fbd;
  --gray: #596574;
  --line: #d8dde4;
  --soft: #f3f6f9;
  --max: 1080px;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  color: var(--ink);
  background: #fff;
  font-family: Inter, Arial, sans-serif;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
}
a {
  color: inherit;
}
.container {
  width: min(calc(100% - 36px), var(--max));
  margin: auto;
}
.nav {
  border-top: 8px solid #222;
  border-bottom: 1px solid var(--line);
}
.nav-in {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.brand {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  font-family: "Space Grotesk", sans-serif;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.055em;
  text-transform: uppercase;
}
.brand::after {
  content: "";
  width: 6px;
  height: 6px;
  margin-left: 8px;
  border-radius: 50%;
  background: #23c75a;
  box-shadow: 0 0 0 4px rgba(35, 199, 90, 0.11);
}
.brand em {
  color: var(--blue);
  font-style: normal;
}
.nav-links {
  display: flex;
  gap: 20px;
  font-size: 11px;
  font-weight: 700;
}
.crumb {
  margin: 0 0 24px;
  color: #7a8490;
  font-size: 11px;
}
.crumb a {
  color: var(--blue);
}
.hero {
  padding: 72px 0 62px;
  background: linear-gradient(135deg, #fff 0%, #f4f7fb 100%);
}
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.18fr) minmax(270px, 0.82fr);
  gap: 70px;
  align-items: end;
}
.eyebrow {
  color: var(--blue);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}
h1,
h2 {
  font-family: "Space Grotesk", sans-serif;
  letter-spacing: -0.045em;
}
h1 {
  max-width: 780px;
  margin: 12px 0 20px;
  font-size: clamp(42px, 6vw, 68px);
  line-height: 1.02;
}
.lead {
  margin: 0;
  color: var(--gray);
  font-size: 18px;
}
.summary {
  padding: 28px;
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: 0 20px 55px rgba(24, 34, 48, 0.08);
}
.summary strong {
  display: block;
  margin-bottom: 12px;
  font-size: 14px;
}
.summary ul {
  margin: 0;
  padding-left: 18px;
  color: var(--gray);
  font-size: 13px;
}
.article {
  padding: 76px 0 90px;
}
.article-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 270px;
  gap: 70px;
  align-items: start;
}
.content {
  min-width: 0;
  max-width: 100%;
}
.content h2 {
  margin: 58px 0 16px;
  font-size: clamp(30px, 4vw, 43px);
  line-height: 1.08;
}
.content h2:first-child {
  margin-top: 0;
}
.content h3 {
  margin: 34px 0 10px;
  font-size: 20px;
}
.content p,
.content li {
  color: #455160;
}
.content a {
  color: var(--blue);
  font-weight: 650;
}
.content table {
  width: 100%;
  margin: 28px 0;
  border-collapse: collapse;
  font-size: 13px;
}
.content th,
.content td {
  padding: 14px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}
.content th {
  background: var(--soft);
}
.note {
  margin: 26px 0;
  padding: 20px 22px;
  border-left: 4px solid var(--blue);
  background: var(--soft);
  color: #34404d;
}
.formula {
  margin: 24px 0;
  padding: 20px;
  color: #fff;
  background: #141a22;
  font-family: "Space Grotesk", sans-serif;
  font-size: 18px;
}
.toc {
  position: sticky;
  top: 20px;
  padding: 22px;
  border: 1px solid var(--line);
  background: #fff;
}
.toc strong {
  display: block;
  margin-bottom: 10px;
}
.toc a {
  display: block;
  padding: 8px 0;
  color: var(--gray);
  border-bottom: 1px solid var(--line);
  font-size: 12px;
  text-decoration: none;
}
.related {
  padding: 64px 0;
  background: var(--soft);
}
.related h2 {
  margin: 0 0 28px;
  font-size: 36px;
}
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.card {
  min-height: 170px;
  padding: 24px;
  border: 1px solid var(--line);
  background: #fff;
  text-decoration: none;
}
.card small {
  color: var(--blue);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.card h3 {
  margin: 20px 0 6px;
  font-size: 18px;
  line-height: 1.25;
}
.card p {
  margin: 0;
  color: var(--gray);
  font-size: 12px;
}
.cta {
  padding: 42px 0;
  color: #fff;
  background: #12171e;
}
.cta-in {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.cta h2 {
  margin: 0;
  font-size: 34px;
}
.button {
  min-height: 50px;
  padding: 0 22px;
  display: inline-flex;
  align-items: center;
  color: #fff;
  background: var(--blue);
  text-decoration: none;
  font-size: 12px;
  font-weight: 700;
}
.footer {
  padding: 30px 0;
  color: var(--gray);
  border-top: 1px solid var(--line);
  font-size: 10px;
}
.footer-in {
  display: flex;
  justify-content: space-between;
  gap: 24px;
}
.quick-answer p {
  margin: 0;
  color: var(--gray);
  font-size: 13px;
}
.answer-box {
  margin-bottom: 48px;
  padding: 30px;
  border: 1px solid #b9d3f2;
  background: #f2f7fd;
}
.answer-box > span {
  color: var(--blue);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.content .answer-box h2 {
  margin: 8px 0 12px;
  font-size: clamp(28px, 3vw, 38px);
}
.answer-box p {
  margin: 0;
}
.feature-figure {
  margin: 34px 0 42px;
}
.feature-figure img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--line);
  background: var(--soft);
}
.feature-figure.pdu-photo img {
  max-height: 640px;
  object-fit: cover;
  object-position: center 48%;
}
.feature-figure figcaption {
  padding: 12px 0;
  color: #687484;
  font-size: 10px;
  line-height: 1.55;
}
.check-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 28px;
  margin: 20px 0 36px;
  padding: 0;
  list-style: none;
}
.check-list li {
  position: relative;
  padding-left: 22px;
  font-size: 13px;
}
.check-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--blue);
  font-weight: 800;
}
.warning-note {
  border-left-color: #e99616;
  background: #fff8eb;
}
.table-scroll {
  width: 100%;
  margin: 28px 0;
  overflow-x: auto;
  border: 1px solid var(--line);
}
.content .comparison-table {
  min-width: 680px;
  margin: 0;
}
.comparison-table th:first-child,
.comparison-table td:first-child {
  width: 22%;
  font-weight: 700;
}
.comparison-table th:nth-child(2) {
  color: #2f3a48;
}
.comparison-table th:nth-child(3) {
  color: var(--blue);
  background: #edf5ff;
}
.benefit-grid,
.decision-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin: 28px 0 42px;
}
.benefit-grid section,
.decision-grid section {
  padding: 24px;
  border: 1px solid var(--line);
  background: #fff;
}
.benefit-grid section > span,
.decision-grid section > span {
  color: var(--blue);
  font-family: "Space Grotesk", sans-serif;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.benefit-grid h3 {
  margin-top: 18px;
}
.benefit-grid p {
  margin-bottom: 0;
  font-size: 12px;
}
.decision-grid section:first-child {
  background: #f4f6f8;
}
.decision-grid section:last-child {
  border-color: #b9d3f2;
  background: #f2f7fd;
}
.decision-grid ul {
  margin: 16px 0 0;
  padding-left: 18px;
}
.decision-grid li {
  margin: 8px 0;
  font-size: 12px;
}
.faq-list {
  margin: 26px 0 44px;
  border-top: 1px solid var(--line);
}
.faq-list details {
  border-bottom: 1px solid var(--line);
}
.faq-list summary {
  padding: 18px 34px 18px 0;
  position: relative;
  cursor: pointer;
  font-family: "Space Grotesk", sans-serif;
  font-size: 17px;
  font-weight: 700;
  list-style: none;
}
.faq-list summary::-webkit-details-marker {
  display: none;
}
.faq-list summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  color: var(--blue);
  font-size: 22px;
}
.faq-list details[open] summary::after {
  content: "−";
}
.faq-list details p {
  margin: -4px 0 18px;
  padding-right: 30px;
  font-size: 13px;
}
.ui-evidence {
  margin: 36px 0 48px;
  padding: clamp(22px, 4vw, 34px);
  border: 1px solid #cbd9e8;
  background: linear-gradient(145deg, #f7faff 0%, #eef5fb 100%);
}
.ui-evidence-kicker {
  display: block;
  color: var(--blue);
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.content .ui-evidence h3 {
  margin: 8px 0 10px;
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(23px, 3vw, 31px);
  line-height: 1.15;
}
.ui-evidence > p {
  margin: 0 0 24px;
}
.ui-shot-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}
.ui-shot {
  margin: 0;
  padding: 14px;
  border: 1px solid var(--line);
  background: #fff;
}
.ui-shot img {
  width: 100%;
  height: 640px;
  display: block;
  object-fit: contain;
  background: #f8fafc;
}
.ui-shot figcaption {
  padding: 14px 4px 2px;
  color: #647184;
  font-size: 11px;
  line-height: 1.55;
}
.ui-shot figcaption strong {
  display: block;
  margin-bottom: 3px;
  color: #253142;
  font-size: 12px;
}
.feature-figure.api-shot img {
  background: #171a1f;
  object-fit: contain;
}
.doc-callout {
  margin: 30px 0 44px;
  padding: 26px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: center;
  border: 1px solid #b9d3f2;
  background: #f2f7fd;
}
.content .doc-callout h3 {
  margin: 4px 0 8px;
  font-size: 22px;
}
.doc-callout p {
  margin: 0;
  font-size: 12px;
}
.doc-callout-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.content .doc-link {
  min-height: 44px;
  padding: 0 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  background: var(--blue);
  font-size: 11px;
  font-weight: 800;
  text-decoration: none;
}
.content .doc-link.secondary {
  color: var(--blue);
  border: 1px solid #9fc1e8;
  background: #fff;
}
.source-list {
  margin: 20px 0 0;
  padding-left: 18px;
  font-size: 11px;
}
.source-list li {
  margin: 10px 0;
}
@media (max-width: 800px) {
  .hero-grid,
  .article-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .toc {
    position: static;
    order: -1;
  }
  .cards {
    grid-template-columns: 1fr;
  }
  .check-list,
  .benefit-grid,
  .decision-grid,
  .ui-shot-grid {
    grid-template-columns: 1fr;
  }
  .ui-shot img {
    height: min(700px, 142vw);
  }
  .doc-callout {
    grid-template-columns: 1fr;
  }
  .content table {
    max-width: 100%;
    display: block;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
  .cta-in,
  .footer-in {
    align-items: flex-start;
    flex-direction: column;
  }
}
@media (max-width: 520px) {
  .container {
    width: min(calc(100% - 24px), var(--max));
  }
  .nav-links a:not(:last-child) {
    display: none;
  }
  .hero {
    padding: 45px 0;
  }
  h1 {
    font-size: 39px;
    overflow-wrap: anywhere;
  }
  .lead {
    font-size: 15px;
  }
  .article {
    padding: 54px 0;
  }
  .content table {
    font-size: 11px;
  }
  .content th,
  .content td {
    padding: 9px;
  }
  .answer-box {
    padding: 22px;
  }
  .feature-figure.pdu-photo img {
    max-height: 520px;
  }
}