/* Brand palette: OriginWater blue. Radius: 4px controls, 8px panels.
   Layers: header 10, skip link 20, dialog native top layer. */
:root {
  color-scheme: light;
  --bg: #fff;
  --surface: #f3f7fa;
  --soft: #eaf3f8;
  --text: #183343;
  --muted: #5b6d79;
  --line: #dce5eb;
  --blue: #0875ad;
  --button: #0875ad;
  --hover: #005e90;
  --panel: #fff;
  --shadow: 0 20px 60px #123b5410;
  font-family: 'Avenir Next', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  font-synthesis: none;
}
* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 110px;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a {
  color: inherit;
  text-decoration: none;
}
button {
  font: inherit;
  cursor: pointer;
}
button,
a {
  -webkit-tap-highlight-color: transparent;
}
button {
  color: inherit;
}
img {
  display: block;
  max-width: 100%;
  height: auto;
}
p,
h1,
h2,
h3,
h4,
figure {
  margin: 0;
}
button:focus-visible,
a:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 5px;
}
::selection {
  background: #c5e8f8;
  color: #123343;
}
.wrap {
  width: min(1280px, calc(100% - 96px));
  margin-inline: auto;
}
.material-symbols-outlined {
  font-size: 23px;
  vertical-align: middle;
}
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 30px;
  min-height: 50px;
  padding: 12px 23px;
  border-radius: 4px;
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  transition:
    background 0.2s,
    transform 0.2s;
}
.button.primary {
  color: #fff;
  background: var(--button);
}
.button.primary:hover {
  background: var(--hover);
}
.button.secondary {
  background: var(--panel);
  border-color: var(--line);
}
.button.secondary:hover {
  border-color: var(--blue);
  color: var(--blue);
}
.button:active,
.icon-button:active {
  transform: translateY(1px);
}
.text-link {
  border: 0;
  background: transparent;
  padding: 0;
  display: inline-flex;
  align-items: center;
  gap: 16px;
  font-weight: 600;
  font-size: 14px;
  min-height: 44px;
  color: var(--blue);
}
.text-link:hover {
  text-decoration: underline;
  text-underline-offset: 6px;
}
.icon-button {
  width: 40px;
  height: 44px;
  display: inline-grid;
  place-items: center;
  border: 0;
  background: transparent;
  border-radius: 4px;
  color: var(--muted);
}
.icon-button:hover {
  background: var(--soft);
  color: var(--blue);
}
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 20;
  background: var(--bg);
  padding: 10px;
  transform: translateY(-160%);
}
.skip-link:focus {
  transform: translateY(0);
}
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  height: 96px;
}
.brand {
  flex-shrink: 0;
  display: block;
}
.brand img {
  width: 288px;
  background: #fff;
  border-radius: 3px;
}
.desktop-nav {
  display: flex;
  gap: 28px;
  margin-left: auto;
}
.desktop-nav a {
  font-size: 14px;
  color: var(--muted);
  padding-block: 20px;
}
.desktop-nav a:hover {
  color: var(--blue);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.header-entry {
  min-height: 44px;
  padding: 9px 18px;
  gap: 22px;
}
.menu-toggle {
  display: none;
}
.mobile-nav[hidden] {
  display: none;
}
.mobile-nav {
  border-top: 1px solid var(--line);
  padding: 12px 24px;
  display: grid;
  gap: 4px;
}
.mobile-nav a {
  padding: 10px;
}
.hero {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 58px;
  align-items: center;
  padding-top: 58px;
  padding-bottom: 48px;
}
.eyebrow {
  color: var(--blue);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  margin-bottom: 24px;
}
.hero .eyebrow span {
  display: block;
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--muted);
  margin-top: 6px;
  font-weight: 500;
}
h1 {
  font-size: clamp(40px, 4.1vw, 60px);
  line-height: 1.32;
  letter-spacing: -0.045em;
  font-weight: 600;
}
h1 span {
  color: var(--blue);
}
.hero-description {
  font-size: 16px;
  color: var(--muted);
  margin-top: 28px;
  max-width: 440px;
  line-height: 1.95;
}
.hero-actions {
  display: flex;
  gap: 26px;
  align-items: center;
  margin-top: 34px;
}
.hero-note {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 12px;
  color: var(--muted);
  margin-top: 36px;
}
.hero-note .material-symbols-outlined {
  font-size: 18px;
}
.hero-visual {
  min-width: 0;
}
.hero-visual > img {
  width: 100%;
  height: 510px;
  object-fit: cover;
  object-position: 52% center;
  border-radius: 8px 8px 0 0;
}
.hero-visual figcaption {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 11px;
  color: var(--muted);
  margin-top: 14px;
}
.hero-visual figcaption span:first-child {
  color: var(--text);
  letter-spacing: 0.04em;
}
.scope-strip {
  border-block: 1px solid var(--line);
  margin-top: 12px;
}
.scope-inner {
  display: grid;
  grid-template-columns: 1.45fr repeat(4, 1fr);
  align-items: center;
  gap: 26px;
  min-height: 92px;
}
.scope-inner p {
  color: var(--muted);
  font-size: 12px;
}
.scope-inner a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 14px;
  padding: 14px 0;
}
.scope-inner a span {
  color: var(--blue);
}
.scope-inner a:hover {
  color: var(--blue);
}
.section {
  padding-top: 112px;
  padding-bottom: 112px;
}
h2 {
  font-size: clamp(30px, 3vw, 42px);
  line-height: 1.45;
  letter-spacing: -0.025em;
  font-weight: 600;
}
.section-intro > p:not(.eyebrow),
.section-heading > p:not(.eyebrow) {
  margin-top: 22px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.9;
}
.section-intro > .text-link {
  margin-top: 30px;
}
.problem-section {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 100px;
}
.problem-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 38px 42px;
}
.problem-grid article {
  padding-bottom: 28px;
  border-bottom: 1px solid var(--line);
}
.feature-icon {
  color: var(--blue);
  font-size: 27px;
  margin-bottom: 18px;
}
h3 {
  font-size: 19px;
  font-weight: 600;
}
.problem-grid p {
  color: var(--muted);
  font-size: 14px;
  margin-top: 12px;
  line-height: 1.9;
}
.model-section {
  background: var(--surface);
}
.section-heading {
  margin-bottom: 48px;
}
.section-heading .eyebrow {
  margin-bottom: 18px;
}
.model-layout {
  display: grid;
  grid-template-columns: 1fr 1.25fr;
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: var(--panel);
}
.model-lead {
  padding: 48px;
  background: var(--soft);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.model-lead > .material-symbols-outlined {
  font-size: 48px;
  color: var(--blue);
  margin-bottom: 38px;
}
.model-lead h3 {
  font-size: 29px;
  line-height: 1.5;
}
.model-lead p {
  margin-top: 24px;
  max-width: 320px;
  color: var(--muted);
  line-height: 1.95;
}
.model-lead .button {
  margin-top: auto;
  padding-top: 12px;
}
.model-layers {
  padding: 8px 36px;
}
.model-layers article {
  padding: 25px 0;
}
.model-layers article + article {
  border-top: 1px solid var(--line);
}
.layer-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 18px;
  font-weight: 600;
}
.layer-label span {
  font-size: 22px;
  color: var(--blue);
}
.model-layers p {
  font-size: 14px;
  color: var(--muted);
  margin-top: 10px;
}
.tags {
  display: flex;
  gap: 20px;
  font-size: 11px;
  color: var(--blue);
  margin-top: 14px;
}
.scenario-panel {
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
}
.scenario-controls {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}
.scenario-controls button {
  border: 0;
  border-bottom: 3px solid transparent;
  background: transparent;
  padding: 20px 10px;
  color: var(--muted);
  font-size: 15px;
}
.scenario-controls button[aria-selected='true'] {
  color: var(--blue);
  border-bottom-color: var(--blue);
  background: var(--panel);
  font-weight: 600;
}
.scenario-controls button:hover {
  color: var(--blue);
}
.scenario-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  padding: 44px;
}
.sample-label {
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.06em;
}
.scenario-story h3 {
  font-size: 26px;
  margin-top: 15px;
}
.scenario-story > p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.95;
  margin-top: 18px;
}
.review-note {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-top: 26px;
  background: var(--surface);
  padding: 18px;
  border-radius: 4px;
}
.review-note > span {
  color: var(--blue);
  flex-shrink: 0;
  margin-top: 3px;
}
.review-note p {
  font-size: 13px;
  color: var(--muted);
  line-height: 1.85;
}
.scenario-story > .text-link {
  margin-top: 22px;
  font-size: 13px;
}
.text-link .material-symbols-outlined {
  font-size: 17px;
}
.evidence-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 15px;
  border-bottom: 1px solid var(--line);
}
h4 {
  font-weight: 600;
  font-size: 14px;
}
.evidence-heading > span {
  font-size: 11px;
  color: var(--muted);
}
.evidence-row {
  display: grid;
  grid-template-columns: 1fr auto;
  width: 100%;
  text-align: left;
  padding: 22px 0;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  gap: 7px 16px;
}
.evidence-row .label {
  font-size: 12px;
  color: var(--blue);
}
.evidence-row .evidence-copy {
  grid-column: 1;
  font-size: 14px;
  line-height: 1.8;
}
.evidence-row .arrow {
  grid-column: 2;
  grid-row: 1/3;
  align-self: center;
  color: var(--blue);
  font-size: 22px;
  transition: transform 0.2s;
}
.evidence-row:hover .arrow {
  transform: translateX(4px);
}
.evidence-row:hover .evidence-copy {
  color: var(--blue);
}
.sample-note {
  color: var(--muted);
  font-size: 11px;
  margin-top: 19px;
}
.workflow-section {
  background: var(--surface);
}
.workflow {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  list-style: none;
  padding: 0;
  margin: 0;
  gap: 36px;
}
.workflow li {
  border-top: 1px solid var(--line);
  padding-top: 28px;
}
.workflow .material-symbols-outlined {
  color: var(--blue);
  font-size: 28px;
  margin-bottom: 23px;
}
.workflow p {
  font-size: 14px;
  color: var(--muted);
  margin-top: 14px;
  max-width: 235px;
}
.contact-section {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 100px;
  align-items: center;
}
.contact-copy > p:not(.eyebrow) {
  color: var(--muted);
  max-width: 440px;
  margin-top: 24px;
}
.contact-copy > .button {
  margin-top: 30px;
}
.author-details {
  margin-top: 25px;
  color: var(--muted);
  max-width: 440px;
  font-size: 13px;
}
.author-details summary {
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
  list-style: none;
}
.author-details summary::-webkit-details-marker {
  display: none;
}
.author-details p {
  padding-top: 14px;
  line-height: 1.9;
}
.contact-card {
  justify-self: center;
  text-align: center;
  padding: 30px 40px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}
.contact-card > img {
  width: 208px;
  height: 208px;
  object-fit: contain;
  margin: auto;
  background: #fff;
}
.contact-card h3 {
  margin-top: 22px;
}
.contact-card p {
  color: var(--muted);
  font-size: 13px;
  margin-top: 4px;
}
.contact-card div > span {
  font-size: 11px;
  color: var(--muted);
  display: block;
  margin-top: 14px;
}
/* Keep the original white-backed logo on a matching brand surface. */
.site-footer {
  --text: #183343;
  --muted: #5b6d79;
  --line: #dce5eb;
  --blue: #0875ad;
  color-scheme: light;
  color: var(--text);
  border-top: 1px solid var(--line);
  background: #fff;
}
.footer-main {
  display: flex;
  align-items: center;
  gap: 50px;
  padding-block: 42px;
}
.footer-main .brand img {
  width: 255px;
}
.footer-main > p {
  font-size: 13px;
}
.footer-main > p span {
  font-size: 11px;
  color: var(--muted);
}
.footer-main > .text-link {
  margin-left: auto;
  font-size: 12px;
}
.footer-bottom {
  display: flex;
  justify-content: space-between;
  border-top: 1px solid var(--line);
  padding-block: 20px;
  font-size: 11px;
  color: var(--muted);
}
dialog {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  padding: 30px;
  width: min(520px, calc(100% - 32px));
  box-shadow: var(--shadow);
}
dialog::backdrop {
  background: #132e4266;
  backdrop-filter: blur(4px);
}
.dialog-heading {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 16px;
  margin-bottom: 20px;
}
.dialog-heading h2 {
  font-size: 21px;
}
#drawerBody p {
  font-size: 14px;
  line-height: 1.9;
  margin-top: 15px;
  color: var(--muted);
}
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translate(-50%, 20px);
  background: var(--text);
  color: var(--bg);
  padding: 12px 22px;
  border-radius: 4px;
  opacity: 0;
  pointer-events: none;
  transition:
    opacity 0.2s,
    transform 0.2s;
  max-width: calc(100% - 32px);
  width: max-content;
  font-size: 13px;
  z-index: 20;
}
.toast.visible {
  opacity: 1;
  transform: translate(-50%, 0);
}
:root[data-theme='dark'] {
  color-scheme: dark;
  --bg: #102531;
  --surface: #152e3c;
  --soft: #193949;
  --text: #e6f0f5;
  --muted: #aabec9;
  --line: #2d4857;
  --blue: #76c5ed;
  --button: #0875ad;
  --hover: #096596;
  --panel: #132b38;
  --shadow: 0 20px 60px #03131f33;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    color-scheme: dark;
    --bg: #102531;
    --surface: #152e3c;
    --soft: #193949;
    --text: #e6f0f5;
    --muted: #aabec9;
    --line: #2d4857;
    --blue: #76c5ed;
    --button: #0875ad;
    --hover: #096596;
    --panel: #132b38;
    --shadow: 0 20px 60px #03131f33;
  }
}
@media (prefers-reduced-motion: no-preference) {
  .hero-copy {
    animation: enter 0.65s both;
  }
  .hero-visual {
    animation: enter 0.85s 0.1s both;
  }
  @keyframes enter {
    from {
      opacity: 0;
      transform: translateY(16px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
}
@media (min-width: 1440px) {
  .hero {
    gap: 80px;
    padding-block: 68px 56px;
  }
  .hero-visual > img {
    height: 550px;
  }
}
@media (max-width: 1180px) {
  .wrap {
    width: calc(100% - 64px);
  }
  .desktop-nav {
    gap: 18px;
  }
  .brand img {
    width: 248px;
  }
  .header-inner {
    gap: 18px;
  }
  .header-actions {
    gap: 6px;
  }
  .hero {
    gap: 32px;
  }
  .hero-actions {
    gap: 18px;
  }
  .hero .eyebrow {
    letter-spacing: 0.08em;
  }
  .hero-visual > img {
    height: 470px;
  }
  .problem-section {
    gap: 60px;
  }
  .model-lead {
    padding: 36px;
  }
  .scenario-content {
    gap: 36px;
    padding: 34px;
  }
  .contact-section {
    gap: 60px;
  }
  .scope-inner {
    gap: 20px;
  }
}
@media (max-width: 1023px) {
  .desktop-nav {
    display: none;
  }
  .menu-toggle {
    display: inline-grid;
  }
  .header-actions {
    margin-left: auto;
  }
  .header-inner {
    height: 84px;
  }
  .hero {
    grid-template-columns: 1fr 1fr;
    gap: 28px;
  }
  .hero-actions {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
  }
  .hero-visual > img {
    height: 480px;
  }
  .hero-description {
    font-size: 14px;
  }
  .desktop-break {
    display: none;
  }
  .hero-note {
    margin-top: 20px;
    font-size: 11px;
  }
  .problem-section {
    gap: 42px;
  }
  .problem-grid {
    gap: 28px;
  }
  .section {
    padding-block: 84px;
  }
  .model-lead h3 {
    font-size: 25px;
  }
  .model-lead {
    padding: 30px;
  }
  .model-lead .button {
    margin-top: 28px;
  }
  .model-layers {
    padding-inline: 26px;
  }
  .scenario-content {
    gap: 30px;
    padding: 30px;
  }
  .workflow {
    gap: 24px;
  }
  .workflow h3 {
    font-size: 17px;
  }
  .scope-inner {
    grid-template-columns: repeat(4, 1fr);
    min-height: 80px;
  }
  .scope-inner > p {
    display: none;
  }
}
@media (max-width: 767px) {
  html {
    scroll-padding-top: 92px;
  }
  .wrap {
    width: calc(100% - 40px);
  }
  .header-inner {
    height: 78px;
    gap: 10px;
  }
  .brand img {
    width: 216px;
  }
  .header-entry {
    display: none;
  }
  .header-actions {
    gap: 0;
  }
  .icon-button {
    width: 36px;
  }
  .hero {
    grid-template-columns: 1fr;
    gap: 34px;
    padding-top: 40px;
    padding-bottom: 30px;
  }
  .hero .eyebrow {
    margin-bottom: 22px;
  }
  .hero .eyebrow span {
    font-size: 9px;
  }
  h1 {
    font-size: 44px;
    line-height: 1.3;
  }
  .hero-description {
    font-size: 15px;
    margin-top: 22px;
    max-width: 450px;
  }
  .hero-actions {
    flex-direction: row;
    align-items: center;
    gap: 24px;
    margin-top: 25px;
  }
  .hero-actions .button {
    font-size: 13px;
    gap: 20px;
    padding-inline: 18px;
  }
  .hero-actions .text-link {
    font-size: 13px;
    gap: 10px;
  }
  .hero-note {
    margin-top: 22px;
  }
  .hero-visual > img {
    height: auto;
    aspect-ratio: 1.3;
    object-fit: cover;
  }
  .hero-visual figcaption {
    font-size: 10px;
    gap: 8px;
  }
  .scope-inner {
    grid-template-columns: repeat(2, 1fr);
    gap: 0 28px;
    padding-block: 12px;
  }
  .scope-inner a {
    font-size: 13px;
    padding: 12px 0;
  }
  .section {
    padding-block: 64px;
  }
  h2 {
    font-size: 31px;
  }
  .problem-section {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .problem-grid {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
  .problem-grid p {
    font-size: 13px;
  }
  .problem-grid h3 {
    font-size: 17px;
  }
  .feature-icon {
    margin-bottom: 12px;
  }
  .section-heading {
    margin-bottom: 32px;
  }
  .model-layout {
    grid-template-columns: 1fr;
  }
  .model-lead {
    padding: 30px;
  }
  .model-lead > .material-symbols-outlined {
    margin-bottom: 22px;
    font-size: 36px;
  }
  .model-lead h3 {
    font-size: 26px;
  }
  .model-lead p {
    margin-top: 16px;
  }
  .model-layers {
    padding: 2px 26px;
  }
  .scenario-controls button {
    font-size: 13px;
    padding: 16px 6px;
  }
  .scenario-content {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 26px 22px;
  }
  .scenario-story h3 {
    font-size: 23px;
  }
  .review-note {
    padding: 15px;
  }
  .workflow {
    grid-template-columns: 1fr 1fr;
    gap: 34px 28px;
  }
  .workflow p {
    font-size: 13px;
  }
  .workflow li {
    padding-top: 24px;
  }
  .workflow .material-symbols-outlined {
    margin-bottom: 18px;
  }
  .contact-section {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .contact-card {
    justify-self: stretch;
    display: flex;
    gap: 24px;
    align-items: center;
    text-align: left;
    padding: 24px;
  }
  .contact-card > img {
    width: 130px;
    height: 130px;
    margin: 0;
  }
  .contact-card h3 {
    margin-top: 0;
  }
  .contact-card p {
    font-size: 12px;
  }
  .contact-card div > span {
    font-size: 10px;
  }
  .footer-main {
    flex-wrap: wrap;
    gap: 24px;
    padding-block: 30px;
  }
  .footer-main .brand img {
    width: 232px;
  }
  .footer-main > p {
    width: 100%;
    order: 3;
  }
  .footer-main > .text-link {
    margin-left: auto;
  }
  .footer-bottom {
    font-size: 10px;
    gap: 16px;
    align-items: flex-start;
  }
  .footer-bottom > span:last-child {
    white-space: nowrap;
  }
}
@media (max-width: 359px) {
  .brand img {
    width: 190px;
  }
  .wrap {
    width: calc(100% - 32px);
  }
  h1 {
    font-size: 39px;
  }
  .hero-actions {
    gap: 14px;
  }
  .hero-actions .button {
    padding-inline: 12px;
  }
  .contact-card {
    gap: 16px;
    padding: 18px;
  }
  .contact-card > img {
    width: 112px;
    height: 112px;
  }
  .footer-main .brand img {
    width: 205px;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}

/* Content architecture: product use and data boundaries. */
.usage-section {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 100px;
  border-bottom: 1px solid var(--line);
}
.usage-questions details {
  border-bottom: 1px solid var(--line);
}
.usage-questions summary {
  cursor: pointer;
  padding: 21px 28px 21px 0;
  font-size: 15px;
  font-weight: 600;
  position: relative;
  list-style: none;
}
.usage-questions summary::-webkit-details-marker {
  display: none;
}
.usage-questions summary::after {
  content: '+';
  position: absolute;
  right: 0;
  color: var(--blue);
}
.usage-questions details[open] summary::after {
  content: '−';
}
.usage-questions p {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.9;
  padding-bottom: 24px;
}
@media (max-width: 1180px) {
  .usage-section {
    gap: 60px;
  }
}
@media (max-width: 767px) {
  .usage-section {
    grid-template-columns: 1fr;
    gap: 24px;
  }
}
@media (max-width: 767px) {
  h1 {
    font-size: clamp(32px, 10vw, 44px);
  }
}

.platform-entry {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 48px;
}
.platform-entry p:not(.eyebrow) {
  margin-top: 20px;
  max-width: 650px;
  color: var(--muted);
}
.platform-entry .button {
  flex-shrink: 0;
}
@media (max-width: 767px) {
  .platform-entry {
    flex-direction: column;
    align-items: flex-start;
    gap: 28px;
  }
}

/* Overall business workflow: readable left-to-right, then top-to-bottom. */
.business-flow { margin: 32px 0 0; padding: 32px; background: var(--panel); border: 1px solid var(--line); border-radius: 8px; }
.business-flow figcaption { margin-bottom: 24px; font-size: 18px; font-weight: 600; }
.flow-sequence { display: grid; grid-template-columns: 1fr 28px 1fr 28px 1fr; align-items: stretch; gap: 8px; }
.flow-node { padding: 22px; border: 1px solid var(--line); border-radius: 6px; background: var(--bg); min-width: 0; }
.flow-node-key { background: var(--soft); border-color: var(--blue); }
.flow-step { display: block; color: var(--blue); font-size: 12px; letter-spacing: .04em; margin-bottom: 10px; }
.business-flow h3 { font-size: 17px; line-height: 1.6; margin: 0 0 8px; }
.business-flow p { color: var(--muted); font-size: 13px; line-height: 1.9; margin: 0; }
.flow-arrow { align-self: center; text-align: center; font-size: 24px; color: var(--blue); }
.flow-connector { display: flex; align-items: center; justify-content: center; gap: 12px; padding: 16px 0; color: var(--muted); font-size: 12px; }
.flow-connector span { color: var(--blue); font-size: 24px; }
.flow-branches { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.flow-application { display: grid; grid-template-columns: 1.5fr 1fr; gap: 32px; padding: 24px; background: var(--soft); border: 1px solid var(--line); border-radius: 6px; }
.flow-support { border-left: 1px solid var(--line); padding-left: 24px; align-self: center; }
.flow-support strong { display: block; font-size: 13px; margin-bottom: 6px; }
.flow-return { display: flex; align-items: center; gap: 18px; padding: 20px 0; margin-top: 8px; border-bottom: 1px solid var(--line); }
.flow-return > span { font-size: 28px; color: var(--blue); }
.flow-return strong { color: var(--text); margin-right: 12px; }
.business-flow .flow-footnote { margin-top: 16px; font-size: 12px; }
@media (max-width: 767px) {
  .business-flow { padding: 20px 16px; }
  .flow-sequence, .flow-branches, .flow-application { grid-template-columns: 1fr; }
  .flow-arrow { transform: rotate(90deg); line-height: 28px; }
  .flow-node { padding: 18px; }
  .flow-application { padding: 18px; gap: 20px; }
  .flow-support { border-left: 0; border-top: 1px solid var(--line); padding: 16px 0 0; }
}

/* Subtle interaction feedback, limited to devices with a precise pointer. */
@media (prefers-reduced-motion: no-preference) {
  .button { transition: background-color 180ms ease, box-shadow 220ms ease, transform 220ms ease; }
  .button > span, .text-link > span { display: inline-block; transition: transform 220ms ease; }
  .desktop-nav a { position: relative; }
  .desktop-nav a::after { content: ''; position: absolute; bottom: -8px; left: 0; right: 0; height: 1px; background: var(--blue); transform: scaleX(0); transform-origin: left; transition: transform 220ms ease; }
  .desktop-nav a:focus-visible::after { transform: scaleX(1); }
  dialog[open] { animation: enter 220ms ease both; }
  @media (hover: hover) and (pointer: fine) {
    .button:hover { transform: translateY(-2px); box-shadow: 0 6px 16px #0875ad18; }
    .button:hover > span, .text-link:hover > span { transform: translateX(3px); }
    .desktop-nav a:hover::after { transform: scaleX(1); }
  }
  .button:active { transform: translateY(0); box-shadow: none; }
}