:root {
  --plm-ink: #122034;
  --plm-muted: #667487;
  --plm-line: #d9e1e8;
  --plm-paper: #f2f5f7;
  --plm-night: #081526;
  --plm-night-soft: #10243b;
  --plm-blue: #2d5bd1;
  --plm-cyan: #1596a5;
  --plm-amber: #ee9c2f;
  --plm-shadow: 0 26px 68px rgba(13, 31, 51, .15);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
.plm-page { margin: 0; color: var(--plm-ink); background: #fff; font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif; }
.plm-page a { color: inherit; text-decoration: none; }
.plm-page img { display: block; max-width: 100%; }
.plm-page .plm-shell { width: min(1180px, calc(100% - 40px)); margin-inline: auto; }
.plm-page main h1,
.plm-page main h2,
.plm-page main h3 { width: 100%; max-width: none; min-width: 0; overflow: visible; white-space: nowrap; text-overflow: clip; }
.plm-overline,
.plm-kicker { margin: 0 0 11px; color: var(--plm-cyan); font-size: 12px; font-weight: 900; letter-spacing: .1em; line-height: 1.45; text-transform: uppercase; }
.plm-button { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 0 20px; border: 1px solid transparent; border-radius: 8px; font-size: 13px; font-weight: 900; transition: transform .2s ease, border-color .2s ease, background .2s ease, box-shadow .2s ease; }
.plm-button:hover { transform: translateY(-2px); }
.plm-button--primary { color: #fff; background: var(--plm-blue); box-shadow: 0 14px 30px rgba(45, 91, 209, .25); }
.plm-button--ghost { color: var(--plm-ink); border-color: #bfcbd6; background: rgba(255,255,255,.7); }
.plm-hero .plm-button--ghost { color: #fff; border-color: rgba(255,255,255,.42); background: rgba(255,255,255,.08); }

.plm-hero { position: relative; min-height: 650px; padding: 0; overflow: hidden; color: #fff; background: var(--plm-night); }
.plm-hero__inner { position: relative; z-index: 1; display: flex; align-items: center; min-height: 650px; }
.plm-hero__copy { width: min(590px,51%); min-width: 0; padding: 80px 0 66px; color: #fff; }
.plm-hero .plm-overline { color: #72d5de; }
.plm-hero h1 { margin: 0; color: #fff; font-size: clamp(43px,5.1vw,70px); font-weight: 950; letter-spacing: -.058em; line-height: 1.02; }
.plm-hero__claim { margin: 20px 0 0; font-size: clamp(21px,2.2vw,31px); font-weight: 930; letter-spacing: -.035em; line-height: 1.3; }
.plm-hero__lead { max-width: 690px; margin: 17px 0 0; color: var(--plm-muted); font-size: 14px; line-height: 1.86; }
.plm-hero .plm-hero__lead { color: rgba(255,255,255,.74); }
.plm-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 25px; }
.plm-proof { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); margin: 29px 0 0; padding: 0; border-top: 1px solid rgba(255,255,255,.2); border-bottom: 1px solid rgba(255,255,255,.2); list-style: none; }
.plm-proof li { min-width: 0; padding: 15px 14px; border-right: 1px solid rgba(255,255,255,.18); }
.plm-proof li:first-child { padding-left: 0; }
.plm-proof li:last-child { border-right: 0; }
.plm-proof strong,
.plm-proof span { display: block; }
.plm-proof strong { font-size: 14px; }
.plm-proof span { margin-top: 5px; color: rgba(255,255,255,.64); font-size: 12px; line-height: 1.55; }
.plm-scene,
.plm-wide-scene { margin: 0; overflow: hidden; border: 1px solid rgba(136,157,177,.34); border-radius: 16px; background: #fff; box-shadow: var(--plm-shadow); }
.plm-hero__visual { position: absolute; inset: 0; margin: 0; overflow: hidden; background: var(--plm-night); }
.plm-hero__visual::after { position: absolute; inset: 0; content: ""; background: linear-gradient(90deg, rgba(5,14,25,.98) 0%, rgba(5,14,25,.91) 37%, rgba(5,14,25,.38) 67%, rgba(5,14,25,.08) 100%); }
.plm-hero__visual img { width: 100%; height: 100%; object-fit: cover; object-position: center; }
.plm-scene img,
.plm-wide-scene img { width: 100%; height: auto; }
.plm-scene figcaption,
.plm-wide-scene figcaption { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 15px 18px; color: #fff; background: var(--plm-night); }
.plm-scene figcaption strong,
.plm-wide-scene figcaption strong { font-size: 14px; white-space: nowrap; }
.plm-scene figcaption span,
.plm-wide-scene figcaption span { color: rgba(255,255,255,.64); font-size: 12px; line-height: 1.55; text-align: right; }

.plm-anchor { position: sticky; top: var(--header-height, 0px); z-index: 60; display: none; border-bottom: 1px solid var(--plm-line); background: rgba(255,255,255,.96); backdrop-filter: blur(14px); }
body.xb-shell-embedded .plm-anchor { top: 0; display: block; }
.plm-anchor__scroll { display: flex; justify-content: center; overflow: auto; scrollbar-width: none; }
.plm-anchor__scroll::-webkit-scrollbar { display: none; }
.plm-anchor__scroll a { flex: 0 0 auto; display: inline-flex; align-items: center; min-height: 48px; padding: 0 17px; border-bottom: 2px solid transparent; color: var(--plm-muted); font-size: 13px; font-weight: 850; white-space: nowrap; }
.plm-anchor__scroll a:hover,
.plm-anchor__scroll a.is-active { color: var(--plm-blue); border-color: var(--plm-blue); }

.plm-section { padding: 82px 0; }
.plm-section--paper { background: var(--plm-paper); }
.plm-section--dark { color: #fff; background: var(--plm-night); }
.plm-heading { display: grid; grid-template-columns: minmax(0,1.24fr) minmax(280px,.76fr); align-items: end; gap: 54px; margin-bottom: 34px; }
.plm-heading > div { min-width: 0; }
.plm-heading h2 { margin: 0; font-size: clamp(30px,3.4vw,48px); font-weight: 950; letter-spacing: -.052em; line-height: 1.12; }
.plm-heading > p { margin: 0; color: var(--plm-muted); font-size: 14px; line-height: 1.85; }
.plm-section--dark .plm-heading > p { color: rgba(255,255,255,.64); }
.plm-section--dark .plm-kicker { color: #64c9d4; }

.plm-role-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); border-top: 1px solid var(--plm-line); border-left: 1px solid var(--plm-line); }
.plm-role-grid article { min-width: 0; padding: 23px 22px; border-right: 1px solid var(--plm-line); border-bottom: 1px solid var(--plm-line); background: #fff; }
.plm-role-grid span { color: var(--plm-cyan); font-size: 13px; font-weight: 900; }
.plm-role-grid h3 { margin: 10px 0 0; font-size: 17px; }
.plm-role-grid p { margin: 8px 0 0; color: var(--plm-muted); font-size: 13px; line-height: 1.7; }
.plm-problem-field { display: grid; grid-template-columns: 1.25fr repeat(2,.875fr); margin-top: 30px; border: 1px solid var(--plm-line); }
.plm-problem-field article { min-width: 0; padding: 22px; border-right: 1px solid var(--plm-line); }
.plm-problem-field article:last-child { border-right: 0; }
.plm-problem-field article:first-child { color: #fff; background: var(--plm-night-soft); }
.plm-problem-field strong { display: block; font-size: 15px; }
.plm-problem-field p { margin: 8px 0 0; color: var(--plm-muted); font-size: 13px; line-height: 1.68; }
.plm-problem-field article:first-child p { color: rgba(255,255,255,.65); }

.plm-wide-scene { border-color: rgba(255,255,255,.16); box-shadow: 0 28px 78px rgba(0,0,0,.3); }
.plm-workflow { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); margin: 30px 0 0; padding: 0; border-top: 1px solid rgba(255,255,255,.15); border-left: 1px solid rgba(255,255,255,.15); list-style: none; }
.plm-workflow li { min-width: 0; padding: 20px; border-right: 1px solid rgba(255,255,255,.15); border-bottom: 1px solid rgba(255,255,255,.15); }
.plm-workflow span { color: #67cdd5; font-size: 12px; font-weight: 900; letter-spacing: .04em; }
.plm-workflow h3 { margin: 9px 0 0; color: #fff; font-size: 17px; }
.plm-workflow p { margin: 7px 0 0; color: rgba(255,255,255,.6); font-size: 13px; line-height: 1.65; }

.plm-story { display: grid; grid-template-columns: minmax(0,1.12fr) minmax(350px,.88fr); align-items: center; gap: 46px; }
.plm-story--reverse { grid-template-columns: minmax(350px,.88fr) minmax(0,1.12fr); }
.plm-story--reverse .plm-scene { order: 2; }
.plm-ledger { border-top: 1px solid var(--plm-line); }
.plm-ledger article { display: grid; grid-template-columns: 34px minmax(0,1fr); gap: 11px; padding: 17px 0; border-bottom: 1px solid var(--plm-line); }
.plm-ledger article > span { grid-row: 1/3; color: var(--plm-blue); font-size: 12px; font-weight: 950; }
.plm-ledger h3 { margin: 0; font-size: 17px; }
.plm-ledger p { margin: 6px 0 0; color: var(--plm-muted); font-size: 13px; line-height: 1.68; }
.plm-lens-controls,
.plm-change-controls { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.plm-lens-controls button,
.plm-change-controls button { min-height: 38px; padding: 0 13px; border: 1px solid #c9d4df; border-radius: 7px; color: var(--plm-muted); background: #fff; font-size: 13px; font-weight: 850; cursor: pointer; transition: color .18s ease, border-color .18s ease, background .18s ease, transform .18s ease; }
.plm-lens-controls button:hover,
.plm-change-controls button:hover { transform: translateY(-1px); }
.plm-lens-controls button.is-active,
.plm-change-controls button.is-active { color: #fff; border-color: var(--plm-blue); background: var(--plm-blue); }
.plm-lens-board,
.plm-change-output { padding: 18px; border-left: 4px solid var(--plm-cyan); color: var(--plm-ink); background: #eaf3f6; font-size: 13px; line-height: 1.75; }

.plm-structure-map { margin-top: 22px; border-top: 1px solid var(--plm-line); }
.plm-structure-map article { display: grid; grid-template-columns: 140px 1fr; align-items: center; gap: 18px; padding: 14px 0; border-bottom: 1px solid var(--plm-line); }
.plm-structure-map strong { color: var(--plm-blue); font-size: 13px; }
.plm-structure-map span { color: var(--plm-muted); font-size: 13px; line-height: 1.6; }

.plm-change-track { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); margin-top: 30px; border-top: 1px solid var(--plm-line); border-bottom: 1px solid var(--plm-line); }
.plm-change-track article { min-width: 0; padding: 20px; border-right: 1px solid var(--plm-line); }
.plm-change-track article:last-child { border-right: 0; }
.plm-change-track span { color: var(--plm-amber); font-size: 12px; font-weight: 950; }
.plm-change-track h3 { margin: 9px 0 0; font-size: 17px; }
.plm-change-track p { margin: 7px 0 0; color: var(--plm-muted); font-size: 13px; line-height: 1.65; }

.plm-handoff { display: grid; grid-template-columns: minmax(0,1.05fr) minmax(350px,.95fr); gap: 42px; align-items: stretch; }
.plm-handoff__copy { display: flex; flex-direction: column; justify-content: center; }
.plm-handoff__lanes { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); margin-top: 18px; border-top: 1px solid var(--plm-line); border-left: 1px solid var(--plm-line); }
.plm-handoff__lanes article { min-width: 0; padding: 18px; border-right: 1px solid var(--plm-line); border-bottom: 1px solid var(--plm-line); }
.plm-handoff__lanes strong { display: block; font-size: 15px; }
.plm-handoff__lanes span { display: block; margin-top: 6px; color: var(--plm-muted); font-size: 13px; line-height: 1.65; }

.plm-evidence { display: grid; grid-template-columns: minmax(0,1.15fr) minmax(330px,.85fr); align-items: center; gap: 44px; }
.plm-evidence .plm-ledger { border-color: rgba(255,255,255,.16); }
.plm-evidence .plm-ledger article { border-color: rgba(255,255,255,.16); }
.plm-evidence .plm-ledger article > span { color: #61c8d3; }
.plm-evidence .plm-ledger h3 { color: #fff; }
.plm-evidence .plm-ledger p { color: rgba(255,255,255,.62); }

.plm-console-rails { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); margin-top: 28px; border-top: 1px solid rgba(255,255,255,.16); border-bottom: 1px solid rgba(255,255,255,.16); }
.plm-console-rails article { min-width: 0; padding: 20px; border-right: 1px solid rgba(255,255,255,.16); }
.plm-console-rails article:last-child { border-right: 0; }
.plm-console-rails strong { display: block; color: #fff; font-size: 15px; }
.plm-console-rails span { display: block; margin-top: 7px; color: rgba(255,255,255,.6); font-size: 13px; line-height: 1.65; }

.plm-scenarios { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); border-top: 1px solid var(--plm-line); border-left: 1px solid var(--plm-line); }
.plm-scenarios article { min-width: 0; padding: 22px; border-right: 1px solid var(--plm-line); border-bottom: 1px solid var(--plm-line); }
.plm-scenarios span { color: var(--plm-cyan); font-size: 12px; font-weight: 950; }
.plm-scenarios h3 { margin: 9px 0 0; font-size: 17px; }
.plm-scenarios p { margin: 7px 0 0; color: var(--plm-muted); font-size: 13px; line-height: 1.68; }
.plm-boundary { display: grid; grid-template-columns: minmax(280px,.75fr) minmax(0,1.25fr); gap: 42px; margin-top: 34px; padding: 28px; color: #fff; background: var(--plm-night-soft); }
.plm-boundary h2 { margin: 0; font-size: clamp(28px,3vw,42px); font-weight: 950; letter-spacing: -.045em; }
.plm-boundary p { margin: 12px 0 0; color: rgba(255,255,255,.63); font-size: 13px; line-height: 1.75; }
.plm-boundary ul { display: grid; gap: 0; margin: 0; padding: 0; list-style: none; }
.plm-boundary li { padding: 11px 0; border-bottom: 1px solid rgba(255,255,255,.13); color: rgba(255,255,255,.72); font-size: 13px; line-height: 1.65; }
.plm-boundary li:last-child { border-bottom: 0; }
.plm-faq { margin-top: 34px; border-top: 1px solid var(--plm-line); }
.plm-faq details { border-bottom: 1px solid var(--plm-line); }
.plm-faq summary { padding: 18px 2px; font-size: 15px; font-weight: 900; cursor: pointer; list-style: none; }
.plm-faq summary::-webkit-details-marker { display: none; }
.plm-faq details p { max-width: 900px; margin: -3px 0 18px; color: var(--plm-muted); font-size: 13px; line-height: 1.78; }

.plm-contact { padding: 68px 0; color: #fff; background: linear-gradient(115deg, #153d7d 0%, #1c5b91 54%, #167c88 100%); }
.plm-contact__inner { display: flex; align-items: center; justify-content: space-between; gap: 42px; }
.plm-contact .plm-kicker { color: #a8e0e5; }
.plm-contact h2 { margin: 0; font-size: clamp(29px,3.2vw,45px); font-weight: 950; letter-spacing: -.045em; }
.plm-contact p:not(.plm-kicker) { margin: 13px 0 0; color: rgba(255,255,255,.72); font-size: 14px; line-height: 1.75; }
.plm-contact__actions { display: flex; flex: 0 0 auto; gap: 10px; }
.plm-contact .plm-button--primary { color: var(--plm-ink); background: #fff; box-shadow: none; }
.plm-contact .plm-button--ghost { color: #fff; border-color: rgba(255,255,255,.42); background: rgba(255,255,255,.08); }

.plm-reveal { opacity: 0; transform: translateY(18px); transition: opacity .62s ease, transform .62s ease; }
.plm-reveal.visible { opacity: 1; transform: none; }

@media (max-width: 1260px) {
  body.xb-shell-ready:not(.xb-shell-embedded) .plm-anchor { display: block; }
  .plm-anchor__scroll { justify-content: flex-start; }
}
@media (max-width: 1080px) {
  .plm-heading { gap: 34px; }
  .plm-story,
  .plm-story--reverse,
  .plm-handoff,
  .plm-evidence { grid-template-columns: 1fr; gap: 30px; }
  .plm-story--reverse .plm-scene { order: 0; }
  .plm-role-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
}
@media (max-width: 820px) {
  .plm-hero { display: flex; flex-direction: column; min-height: 0; background: var(--plm-night); }
  .plm-hero__inner { order: 1; display: block; min-height: 0; padding: 50px 0 38px; background: var(--plm-night); }
  .plm-hero__copy { width: 100%; padding: 0; color: #fff; }
  .plm-hero__visual { position: relative; inset: auto; order: 2; width: 100%; aspect-ratio: 16 / 9; }
  .plm-hero__visual::after { background: linear-gradient(180deg, var(--plm-night) 0%, rgba(8,21,38,.12) 38%, rgba(8,21,38,.08) 100%); }
  .plm-hero__visual img { width: 100%; height: 100%; object-fit: cover; object-position: center; }
}
@media (max-width: 760px) {
  .plm-page .plm-shell { width: calc(100% - 28px); }
  .plm-hero { padding: 0; }
  .plm-hero__inner { padding: 42px 0 36px; }
  .plm-hero h1 { font-size: clamp(25px,7.8vw,39px); }
  .plm-hero__claim { margin-top: 16px; font-size: clamp(18px,4.9vw,24px); }
  .plm-hero__lead { margin-top: 13px; font-size: 13px; line-height: 1.72; }
  .plm-actions { margin-top: 20px; }
  .plm-actions { display: grid; grid-template-columns: 1fr 1fr; }
  .plm-proof li { padding: 13px 7px; text-align: center; }
  .plm-proof li:first-child { padding-left: 7px; }
  .plm-scene,
  .plm-wide-scene { border-radius: 11px; }
  .plm-scene figcaption,
  .plm-wide-scene figcaption { align-items: flex-start; flex-direction: column; gap: 6px; }
  .plm-scene figcaption span,
  .plm-wide-scene figcaption span { text-align: left; }
  .plm-section { padding: 60px 0; }
  .plm-heading { display: block; margin-bottom: 27px; }
  .plm-heading > p { margin-top: 14px; }
  .plm-heading h2 { font-size: clamp(23px,7.1vw,34px); }
  .plm-workflow { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .plm-problem-field { grid-template-columns: 1fr; }
  .plm-problem-field article { border-right: 0; border-bottom: 1px solid var(--plm-line); }
  .plm-problem-field article:last-child { border-bottom: 0; }
  .plm-change-track,
  .plm-console-rails { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .plm-change-track article:nth-child(2),
  .plm-console-rails article:nth-child(2) { border-right: 0; }
  .plm-change-track article:nth-child(-n+2),
  .plm-console-rails article:nth-child(-n+2) { border-bottom: 1px solid var(--plm-line); }
  .plm-console-rails article:nth-child(-n+2) { border-bottom-color: rgba(255,255,255,.16); }
  .plm-scenarios { grid-template-columns: 1fr; }
  .plm-boundary { grid-template-columns: 1fr; gap: 25px; padding: 24px 20px; }
  .plm-contact__inner { align-items: flex-start; flex-direction: column; }
}
@media (max-width: 520px) {
  .plm-hero__copy { padding: 34px 0 30px; }
  .plm-hero h1 { font-size: clamp(18px,6.1vw,29px); }
  .plm-hero__claim { font-size: clamp(17px,4.8vw,21px); }
  .plm-actions,
  .plm-contact__actions { display: grid; grid-template-columns: 1fr; width: 100%; }
  .plm-proof { grid-template-columns: 1fr; }
  .plm-proof li,
  .plm-proof li:first-child { padding: 12px 0; border-right: 0; border-bottom: 1px solid #cbd6df; text-align: left; }
  .plm-proof li:last-child { border-bottom: 0; }
  .plm-role-grid,
  .plm-workflow,
  .plm-change-track,
  .plm-console-rails,
  .plm-handoff__lanes { grid-template-columns: 1fr; }
  .plm-change-track article,
  .plm-change-track article:nth-child(2),
  .plm-console-rails article,
  .plm-console-rails article:nth-child(2) { border-right: 0; border-bottom: 1px solid var(--plm-line); }
  .plm-console-rails article { border-bottom-color: rgba(255,255,255,.16); }
  .plm-change-track article:last-child,
  .plm-console-rails article:last-child { border-bottom: 0; }
  .plm-structure-map article { grid-template-columns: 1fr; gap: 5px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .plm-reveal { opacity: 1; transform: none; transition: none; }
  .plm-button,
  .plm-lens-controls button,
  .plm-change-controls button { transition: none; }
}

/* Ultra-wide face-safe hero for the complete engineering review team. */
@media (min-width: 1041px) {
  .plm-hero,
  .plm-hero__inner { min-height: clamp(650px, 25vw, 860px); }
  .plm-hero__visual img { object-position: center 27%; }
}

@media (max-width: 820px) {
  .plm-hero__visual img { object-fit: contain; object-position: center; }
}
.plm-page :where(a,button):focus-visible {
  outline: 3px solid var(--plm-cyan);
  outline-offset: 3px;
}