.platform-page .site-header { padding-top: 12px; padding-bottom: 12px; }
.platform-page .platform-hero .flow-stage { display: flex; align-items: center; justify-content: center; mask-image: none; }
.platform-page .platform-hero .flow-ribbon {
  width: auto; height: 100%; aspect-ratio: 1; max-width: none;
  transform: none; will-change: auto;
  mask-image: radial-gradient(ellipse at center, #000 38%, transparent 70%);
}
.platform-page .platform-hero .flow-stage::after { display: none; }
.platform-page .platform-hero { padding-top: 64px; padding-bottom: 64px; }
.platform-page .platform-hero h1 { font-size: clamp(36px, 4.2vw, 60px); max-width: 13em; }
.platform-page .platform-hero .lead { font-size: 18px; max-width: 42ch; }
.platform-page .section-intro { max-width: 760px; margin-bottom: 40px; }
.platform-page .section-intro h2, .explore-adoption h2 { font-size: clamp(30px, 3.6vw, 44px); line-height: 1.2; }
.platform-page .section-intro p { font-size: 17px; }
.feature-explorer { display: grid; gap: 48px; }
.feature-picker { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.catalog-card { display: flex; flex-direction: column; min-width: 0; padding: 24px; border: 1px solid var(--line); border-radius: 8px; background: var(--highlight); }
.catalog-card h3 { margin: 0 0 16px; font-size: 22px; line-height: 1.3; }
.catalog-card-description { margin: 0 0 24px; color: var(--muted); font-size: 16px; }
.catalog-card button { display: flex; align-items: center; justify-content: space-between; gap: 16px; width: 100%; min-height: 44px; margin-top: auto; padding: 8px 12px; border: 1px solid var(--line); border-radius: 4px; background: transparent; color: var(--signal); font: inherit; font-size: 14px; cursor: pointer; }
.catalog-card button:hover, .catalog-card button[aria-pressed="true"] { border-color: var(--signal); background: var(--faint); }
.catalog-card button:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
.catalog-card .selection-toggle { margin-top: 8px; }
.catalog-card.is-selected { border-color: var(--signal); }
.selection-summary { padding: 24px; background: var(--faint); border-radius: 8px; }
.selection-heading { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px; }
.selection-heading h3 { margin: 0; font-size: 22px; }
.selection-heading button { min-height: 44px; padding: 8px 12px; border: 1px solid var(--line); border-radius: 4px; background: var(--highlight); color: var(--signal); font: inherit; font-size: 14px; cursor: pointer; }
.selection-heading button:disabled { opacity: .6; cursor: default; }
.selection-summary ul { display: flex; flex-wrap: wrap; gap: 12px 24px; padding: 0; list-style: none; }
.selection-summary [hidden] { display: none; }
.selection-quote { margin-top: 16px; max-width: 100%; white-space: normal; }
.catalog-return { margin: 0 0 24px; min-height: 44px; align-items: center; }
.feature-detail { min-width: 0; padding: 32px; background: var(--highlight); border: 1px solid var(--line); border-radius: 8px; scroll-margin-top: 128px; }
.feature-detail h3 { margin: 0 0 16px; font-size: 28px; line-height: 1.25; }
.demo-kind { margin: 0 0 12px; color: var(--signal); font-size: 14px; }
.feature-description { margin: 0 0 16px; max-width: 58ch; font-size: 16px; }
.demo-notice { color: var(--muted); font-size: 14px; line-height: 1.7; }
.demo-surface { margin-top: 24px; padding: 24px; background: var(--faint); border-radius: 4px; }
.demo-surface section[hidden], .demo-surface [hidden] { display: none; }
.demo-surface label { display: block; margin: 16px 0 8px; font-size: 14px; }
.demo-surface input, .demo-surface select { width: 100%; min-height: 44px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 4px; color: var(--black); background: var(--highlight); font: inherit; }
.demo-surface button { min-height: 44px; padding: 10px 16px; border: 1px solid var(--signal); border-radius: 4px; background: var(--highlight); color: var(--signal); font: inherit; font-size: 14px; cursor: pointer; }
.demo-surface button:hover { background: var(--signal); color: var(--highlight); }
.demo-surface button:disabled { opacity: .6; cursor: default; }
.demo-surface :is(input,select):focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
.demo-input-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 12px; }
.demo-input-row button { white-space: nowrap; background: var(--signal); color: var(--highlight); }
.demo-input-row button:hover { background: var(--black); }
.demo-sentence { margin: 24px 0; font-size: 20px; line-height: 1.6; }
.demo-word { margin: 20px 0; font: 600 36px/1.2 var(--font-display); }
.demo-result { margin: 16px 0 0; color: var(--black); min-height: 24px; font-size: 15px; }
.demo-options, .demo-actions { display: flex; flex-wrap: wrap; gap: 12px; margin: 16px 0; }
.demo-log { padding-left: 20px; margin: 20px 0 0; font-size: 14px; }
.demo-log li { margin-bottom: 12px; }
.demo-feedback { margin: 24px 0 0; }
.demo-feedback dt { margin-top: 24px; color: var(--signal); font-size: 14px; font-weight: 600; }
.demo-feedback dd { margin: 8px 0 0; font-size: 16px; line-height: 1.7; }
.feature-consult { margin: 24px 0 0; }
.feature-consult a { min-height: 44px; align-items: center; margin: 0; }
.explore-adoption { max-width: 900px; }
.explore-adoption > p { max-width: 62ch; margin: 24px 0 40px; font-size: 18px; }
.adoption-outline { display: grid; gap: 24px; margin: 0; }
.adoption-outline > div { display: grid; grid-template-columns: 160px minmax(0, 1fr); gap: 24px; }
.adoption-outline dt { font-weight: 600; color: var(--signal); }
.adoption-outline dd { margin: 0; color: var(--muted); }
@media (max-width: 1024px) {
  .feature-picker { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 768px) {
  .feature-explorer { gap: 24px; }
  .feature-detail { padding: 24px; }
  .demo-surface { padding: 20px; }
  .adoption-outline > div { grid-template-columns: 1fr; gap: 8px; }
}
@media (max-width: 680px) {
  .feature-picker { grid-template-columns: 1fr; }
}
@media (max-width: 480px) {
  .platform-page .platform-hero { padding-top: 40px; padding-bottom: 32px; }
  .platform-page .platform-hero h1 { font-size: 36px; }
  .platform-page .platform-hero .lead { font-size: 16px; }
  .feature-detail h3 { font-size: 26px; }
  .demo-input-row { grid-template-columns: 1fr; }
  .demo-sentence { font-size: 18px; }
}