/* V4D: content and reading rhythm, built on the confirmed V4C.5.4 world. */
.v4d {
  --muted: #9a9b96;
  --surface: #101111;
  --surface-warm: #111110;
}

.v4d :is(p, dd, li) { text-wrap: pretty; }
.v4d :is(h1, h2, h3) { text-wrap: balance; }
.v4d :is(a, button, summary, input, textarea):focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: 6px;
}
.v4d .page-kicker { font-size: 11px; line-height: 1.6; }
.v4d .page-kicker > span:last-child { font-size: 12px; }
.v4d .desktop-nav a { font-size: 13px; }
.v4d .motion-toggle { font-size: 10px; min-height: 44px; }
.v4d .site-footer { font-size: 11px; }
.v4d .signal-text { color: var(--signal); }

/* Headlines stay in normal flow; long Chinese content may grow the section. */
.home.v4d .statement-title {
  font-size: clamp(38px, 4.7vw, 72px);
  line-height: 1.18;
  word-break: normal;
  overflow-wrap: break-word;
}
.home.v4d .statement-title > span:not(.small-lead) { display: block; }
.home.v4d .statement-copy { font-size: clamp(17px, 1.45vw, 22px); line-height: 1.8; }
.home.v4d .home-panel:not(.home-hero) {
  padding-top: calc(var(--header) + 40px);
  padding-bottom: 56px;
}
.home.v4d .outside-copy .statement-title { font-size: clamp(38px, 4.3vw, 64px); }
.home.v4d .outside-copy .statement-copy { margin-top: 24px; }
.home.v4d .outside-belief { font-size: 14px; line-height: 1.75; }
.v4d-problem-layout { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); gap: 8vw; align-items: center; }
.v4d-problem-layout .statement-copy { max-width: 29em; }
.v4d-barriers { margin: 0; }
.v4d-barriers > div { padding: 26px 0; border-bottom: 1px solid var(--line); }
.v4d-barriers > div:first-child { border-top: 1px solid var(--line); }
.v4d-barriers dt { font-size: 24px; font-weight: 600; }
.v4d-barriers dd { margin: 10px 0 0; color: var(--ink-soft); font-size: 16px; line-height: 1.7; }

.v4d-domain-line { display: flex; flex-wrap: wrap; align-items: baseline; gap: 10px 28px; margin-bottom: 34px; scroll-margin-top: calc(var(--header) + 24px); }
.v4d-domain-line p { margin: 0; font-size: 15px; color: var(--ink-soft); }
.v4d-domain-line p:first-child { color: var(--ink); font-size: 18px; }
.v4d-domain-line strong { color: var(--signal); font-weight: 500; }
.home.v4d .network-title { font-size: clamp(34px, 4.1vw, 66px); max-width: 22em; }
.home.v4d .network-title .small-lead { color: var(--ink-soft); font-size: 16px; margin-bottom: 16px; }
.home.v4d .network-foot { margin-top: 30px; backdrop-filter: none; background: transparent; }
.home.v4d .network-foot strong { font-size: 11px; }
.home.v4d .network-foot span { font-size: 15px; }

.v4d-work-head { display: flex; justify-content: space-between; align-items: end; gap: 24px; margin-bottom: 30px; }
.v4d-work-head p { margin: 0; color: var(--ink-soft); font-size: 15px; line-height: 1.8; }
.v4d-work-head [lang="en"] { font: 10px/1.8 "AVIXI Mono", monospace; }
.v4d-business-grid { display: grid; grid-template-columns: minmax(0, 1.9fr) minmax(0, 1fr); border-top: 1px solid var(--line-strong); border-bottom: 1px solid var(--line); }
.v4d-business-grid article { padding: 28px 0; min-width: 0; }
.v4d-originals-preview { display: grid; grid-template-columns: minmax(0, 1fr) minmax(130px, .48fr); gap: 24px; padding-right: 34px !important; border-right: 1px solid var(--line); }
.v4d-business-grid h3 { margin: 0 0 20px; font-size: 17px; font-weight: 500; }
.v4d-business-grid h3 > span { display: block; font: 11px/1.7 "AVIXI Mono", monospace; color: var(--ink-soft); margin-bottom: 5px; }
.v4d-feature-name { margin: 0 0 4px; font: 36px/1.2 "AVIXI Mono", monospace; }
.v4d-feature-name span { font: 18px/1.4 "PingFang SC", sans-serif; color: var(--ink-soft); }
.v4d-feature-line { margin: 0; font-size: 23px; font-weight: 600; line-height: 1.5; }
.v4d-business-copy { color: var(--ink-soft); font-size: 15px; line-height: 1.8; margin: 16px 0 18px; max-width: 31em; }
.v4d-business-grid .text-link { min-height: 44px; font-size: 14px; display: inline-flex; align-items: center; gap: 20px; }
.v4d-originals-preview figure { margin: 0; align-self: center; }
.v4d-originals-preview img { display: block; width: 100%; height: 264px; object-fit: contain; filter: grayscale(1); transition: filter 220ms ease; }
.v4d-originals-preview:is(:hover, :focus-within) img { filter: none; }
.v4d-systems-preview { padding-left: 34px !important; }
.v4d-systems-preview .v4d-feature-line { margin-top: 30px; }
.v4d-practice-link { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding-top: 18px; }
.v4d-practice-link p { margin: 0; font-size: 14px; color: var(--ink-soft); }
.v4d-practice-link a { display: inline-flex; align-items: center; min-height: 44px; gap: 24px; font-size: 14px; }
.v4d-practice-link a:hover { color: var(--signal); }
.v4d-end-actions { margin-top: 30px; display: grid; gap: 10px; }
.v4d-end-actions a { padding: 12px 0; min-height: 44px; font-size: 15px; border-bottom: 1px solid var(--line-strong); display: flex; justify-content: space-between; gap: 26px; }
.v4d-end-actions a:hover { color: var(--signal); }
.home.v4d .home-attitude { padding-bottom: 90px; }
.home.v4d .attitude-lockup { grid-template-columns: minmax(0, 1.5fr) minmax(260px, .65fr); gap: 5vw; }
.home.v4d .attitude-en { font-size: clamp(50px, 6.9vw, 105px); }
.home.v4d .home-endline { font-size: 10px; }

@media (max-width: 1100px) and (min-width: 901px) {
  .v4d-business-grid { grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr); }
  .v4d-originals-preview { gap: 18px; padding-right: 22px !important; }
  .v4d-systems-preview { padding-left: 22px !important; }
  .v4d-business-copy { font-size: 14px; }
  .v4d-work-head [lang="en"] { display: none; }
}

@media (max-width: 900px) {
  .home.v4d .home-panel:not(.home-hero) { min-height: auto; padding-top: 88px; padding-bottom: 76px; }
  .v4d-problem-layout { grid-template-columns: 1fr; gap: 34px; }
  .v4d-barriers { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
  .v4d-barriers > div { padding: 20px 0; border-top: 1px solid var(--line); }
  .v4d-barriers dt { font-size: 21px; }
  .v4d-barriers dd { font-size: 15px; }
  .v4d-business-grid { grid-template-columns: 1fr; }
  .v4d-originals-preview { padding-right: 0 !important; border-right: 0; }
  .v4d-systems-preview { padding-left: 0 !important; border-top: 1px solid var(--line); }
  .v4d-systems-preview .v4d-feature-line { margin-top: 0; }
  .home.v4d .attitude-lockup { grid-template-columns: 1fr; gap: 42px; }
  .v4d-end-actions { max-width: 480px; }
  .home.v4d .home-attitude { padding-bottom: 120px; }
}

@media (max-width: 600px) {
  .home.v4d .statement-title { font-size: clamp(32px, 8.5vw, 46px); }
  .home.v4d .outside-copy .statement-title { font-size: clamp(32px, 8.5vw, 46px); }
  .home.v4d .statement-copy { margin-top: 24px; font-size: 16px; }
  .v4d-barriers { grid-template-columns: 1fr; gap: 0; }
  .v4d-barriers > div + div { border-top: 0; }
  .v4d-domain-line { gap: 10px; margin-bottom: 30px; }
  .v4d-domain-line p { font-size: 13px; }
  .home.v4d .network-title { font-size: clamp(28px, 7.3vw, 38px); line-height: 1.4; }
  .home.v4d .network-foot { grid-template-columns: 1fr; }
  .home.v4d .network-foot div { min-height: 78px; border-right: 0; border-bottom: 1px solid var(--line); padding-left: 0; }
  .home.v4d .network-foot div:last-child { border-bottom: 0; }
  .v4d-work-head { display: block; }
  .v4d-work-head p { margin-top: 20px; }
  .v4d-work-head [lang="en"] { font-size: 9px; }
  .v4d-originals-preview { grid-template-columns: minmax(0, 1fr) 100px; gap: 14px; }
  .v4d-originals-preview img { height: 220px; }
  .v4d-business-copy { font-size: 14px; }
  .v4d-feature-name { font-size: 29px; }
  .v4d-feature-line { font-size: 20px; }
  .v4d-practice-link { align-items: start; flex-direction: column; gap: 4px; }
  .home.v4d .attitude-en { font-size: clamp(35px, 9.2vw, 55px); }
  .home.v4d .attitude-cn { font-size: 28px; }
  .home.v4d .home-endline { flex-wrap: wrap; gap: 8px 20px; font-size: 9px; }
}

@media (hover: none), (pointer: coarse) {
  .v4d-originals-preview img { filter: none; }
}
@media (prefers-reduced-motion: reduce) {
  .v4d-originals-preview img { transition: none; }
}
.v4d-name { white-space: nowrap; }