/* AiSE home page (Private AI landing). Builds on the tokens in styles.css. */
html.pai-lock { overflow: hidden; }
.home .site-header { background: rgba(247, 245, 240, .96); }

/* ---------- Shared ---------- */
.pai-section { padding: 112px 0; scroll-margin-top: var(--header-h); }
.pai-alt { background: var(--surface); border-block: 1px solid var(--border); }
.pai-dark { background: var(--dark); color: #fff; }
.pai-dark .eyebrow { color: #8FD0C7; }
.pai-head { max-width: 760px; margin-bottom: 56px; }
.pai-head h2 { margin: 0; font-size: clamp(32px, 4vw, 46px); line-height: 1.1; }
.pai-head > p:not(.eyebrow) { margin: 18px 0 0; color: var(--text-muted); font-size: 18px; line-height: 1.65; }
.pai-dark .pai-head > p:not(.eyebrow) { color: rgba(255, 255, 255, .72); }
.pai-dark .pai-head h2 { color: #fff; }
.pai-head-row { display: flex; max-width: none; align-items: end; justify-content: space-between; gap: 32px; }
.pai-head-row > div { max-width: 760px; }
.pai-btn-sm { min-height: 40px; padding: 0 16px; font-size: 13.5px; white-space: nowrap; }
.pai-btn-block { width: 100%; }
.button[disabled] { opacity: .6; cursor: progress; }
:where(.home) h3, :where(.home) h2, :where(.home) h1, :where(.home) p, :where(.home) figure { margin: 0; }
:where(.home) ul, :where(.home) ol { margin: 0; padding: 0; list-style: none; }
.home figcaption { margin-top: 12px; color: var(--text-soft); font-size: 13px; }
.home button { font: inherit; cursor: pointer; }
.pai-num { color: var(--teal); font-family: var(--font-serif); font-size: 20px; font-weight: 600; }
.pai-fineprint { color: var(--text-soft); font-size: 12.5px; line-height: 1.55; }
.pai-dash-list { display: grid; }
.pai-dash-list li { position: relative; padding: 12px 0 12px 22px; border-top: 1px solid var(--border); line-height: 1.5; }
.pai-dash-list li::before { content: ''; position: absolute; left: 0; top: 24px; width: 10px; height: 1.5px; background: var(--teal); }
.pai-dash-list li:last-child { border-bottom: 1px solid var(--border); }

/* Slide images */
.slide-zoom { position: relative; display: block; width: 100%; padding: 0; overflow: hidden; border: 1px solid var(--border-strong); border-radius: var(--radius-sm); background: #fff; box-shadow: var(--shadow-sm); cursor: zoom-in; transition: border-color .15s ease, box-shadow .2s ease; }
.slide-zoom:hover { border-color: var(--teal); box-shadow: var(--shadow-lg); }
.slide-zoom img { display: block; width: 100%; height: auto; }
.slide-zoom-hint { position: absolute; right: 10px; bottom: 10px; display: inline-flex; align-items: center; gap: 6px; padding: 6px 10px; border-radius: var(--radius-sm); background: rgba(15, 29, 27, .88); color: #fff; font-size: 12px; font-weight: 600; opacity: 0; transition: opacity .15s ease; }
.slide-zoom:hover .slide-zoom-hint, .slide-zoom:focus-visible .slide-zoom-hint { opacity: 1; }
@media (hover: none) { .slide-zoom-hint { opacity: 1; } }
.pai-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; margin-top: 72px; }

/* ---------- Hero ---------- */
.pai-hero { background: var(--paper); }
.pai-hero-grid { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); gap: 80px; align-items: center; padding: calc(var(--header-h) + 80px) 0 88px; }
.pai-hero h1 { max-width: 760px; font-size: clamp(42px, 5.6vw, 72px); font-weight: 600; line-height: 1.04; letter-spacing: -0.02em; }
.pai-hero h1 span { color: var(--teal); }
.pai-lede { max-width: 580px; margin-top: 28px !important; color: var(--text-muted); font-size: 20px; line-height: 1.6; }
.pai-lede strong { color: var(--ink); font-weight: 600; }
.pai-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 40px; }
.pai-tiles { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.pai-tile { position: relative; display: flex; flex-direction: column; justify-content: flex-end; gap: 6px; aspect-ratio: 1; padding: 22px; color: #fff; }
.pai-tile strong { font-size: 21px; font-weight: 600; line-height: 1.2; }
.pai-tile > span:last-child { font-size: 13.5px; line-height: 1.4; opacity: .86; }
.pai-tile-n { position: absolute; top: 18px; left: 22px; font-size: 12px; font-weight: 600; letter-spacing: .14em; opacity: .7; }
.pai-tone-teal { background: var(--teal); }
.pai-tone-orange { background: var(--orange); }
.pai-tone-slate { background: var(--slate); }
.pai-tone-plum { background: var(--plum); }
.pai-band { background: var(--dark); color: #fff; }
.pai-metrics { display: grid; grid-template-columns: repeat(3, 1fr); }
.pai-metrics li { padding: 40px 36px 44px; border-left: 1px solid var(--dark-line); }
.pai-metrics li:first-child { padding-left: 0; border-left: 0; }
.pai-metrics strong { display: block; font-family: var(--font-serif); font-size: clamp(34px, 4vw, 48px); font-weight: 600; line-height: 1.1; }
.pai-metrics li:nth-child(3) strong { font-size: clamp(22px, 2.3vw, 28px); line-height: 1.35; padding-top: 6px; }
.pai-metrics span { display: block; margin-top: 12px; color: #8FD0C7; font-size: 12.5px; font-weight: 600; letter-spacing: .12em; text-transform: uppercase; }
.pai-metrics p { margin-top: 8px; max-width: 320px; color: rgba(255, 255, 255, .7); font-size: 15px; line-height: 1.55; }

/* ---------- Problem ---------- */
.pai-split { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: 80px; align-items: start; }
.pai-split .pai-head { margin-bottom: 0; }
.pai-dilemma { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; padding-top: 4px; }
.pai-dilemma-col { padding-top: 22px; border-top: 2px solid var(--ink); }
.pai-dilemma-n { color: var(--text-soft); font-size: 12px; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; }
.pai-dilemma-col h3 { margin: 10px 0 22px; font-size: 26px; line-height: 1.2; }
.pai-solution { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); column-gap: 80px; margin-top: 88px; padding: 56px 0; border-block: 1px solid var(--border-strong); }
.pai-solution .eyebrow { grid-column: 1; grid-row: 1; margin: 6px 0 0; }
.pai-solution-text, .pai-solution-sub { grid-column: 2; }
.pai-solution-text { font-family: var(--font-serif); font-size: clamp(26px, 3vw, 36px); font-weight: 500; line-height: 1.25; letter-spacing: -0.012em; }
.pai-solution-sub { margin-top: 18px !important; color: var(--text-muted); font-size: 17px; line-height: 1.65; }
.pai-trifecta { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; margin-top: 56px; }
.pai-trifecta li { padding-top: 18px; border-top: 1px solid var(--border-strong); }
.pai-trifecta .pai-num { display: block; margin-bottom: 8px; }
.pai-trifecta strong { font-family: var(--font-serif); font-size: 22px; font-weight: 600; }
.pai-trifecta p { margin-top: 8px; color: var(--text-muted); font-size: 15.5px; line-height: 1.6; }

/* ---------- Offerings ---------- */
.pai-offers { display: grid; grid-template-columns: 1fr 1fr; column-gap: 80px; }
.pai-offer { display: grid; grid-template-columns: 56px 1fr; gap: 8px; padding: 32px 0 36px; border-top: 1px solid var(--border-strong); }
.pai-offer:nth-child(-n+2) { border-top: 2px solid var(--ink); }
.pai-offer-n { color: var(--teal); font-family: var(--font-serif); font-size: 30px; font-weight: 600; line-height: 1; }
.pai-offer h3 { font-size: 25px; line-height: 1.2; }
.pai-offer p { margin-top: 12px; color: var(--text-muted); font-size: 16px; line-height: 1.65; }
.pai-offer .pai-offer-tags { margin-top: 14px; color: var(--teal-dark); font-size: 13px; font-weight: 600; letter-spacing: .02em; }
.pai-specs { margin-top: 18px; }
.pai-specs summary { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); font-size: 14px; font-weight: 600; cursor: pointer; list-style: none; }
.pai-specs summary::-webkit-details-marker { display: none; }
.pai-specs summary::after { content: '+'; display: inline-grid; place-items: center; width: 22px; height: 22px; border: 1px solid var(--border-strong); border-radius: 50%; font-weight: 400; line-height: 1; }
.pai-specs[open] summary::after { content: '–'; }
.pai-specs summary:hover::after { border-color: var(--teal); color: var(--teal); }
.pai-spec-list { display: grid; gap: 8px; margin-top: 16px; padding: 18px 20px; background: var(--paper); border-left: 2px solid var(--teal); font-family: var(--font-mono); font-size: 12.5px; line-height: 1.55; color: var(--ink); }
.pai-spec-list li { position: relative; padding-left: 14px; }
.pai-spec-list li::before { content: '›'; position: absolute; left: 0; color: var(--teal); }

/* ---------- Architecture ---------- */
.pai-arch { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr); gap: 56px; align-items: start; }
.pai-arch-figure { position: sticky; top: calc(var(--header-h) + 24px); }
.pai-explorer { display: grid; gap: 12px; }
.pai-perimeter, .pai-outside { position: relative; display: grid; grid-template-columns: 1fr 1fr; gap: 8px; padding: 40px 14px 14px; }
.pai-perimeter { border: 1.5px dashed var(--teal); background: var(--teal-soft); }
.pai-outside { grid-template-columns: 1fr; border: 1.5px dashed var(--orange); background: #F6E9E0; }
.pai-zone { position: absolute; top: 14px; left: 16px; color: var(--teal-dark); font-size: 11.5px; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; }
.pai-outside .pai-zone { color: var(--orange); }
.pai-layer { display: grid; gap: 3px; padding: 14px 16px; border: 0; border-radius: 2px; color: #fff; text-align: left; transition: filter .15s ease, box-shadow .15s ease; }
.pai-layer strong { font-size: 15px; font-weight: 600; }
.pai-layer span { color: rgba(255, 255, 255, .85); font-size: 13px; line-height: 1.4; }
.pai-layer:hover { filter: brightness(1.1); }
.pai-layer.is-active { box-shadow: 0 0 0 2px var(--paper), 0 0 0 4px var(--ink); }
.pai-perimeter .pai-layer { grid-column: span 2; }
.pai-perimeter .pai-layer-models, .pai-perimeter .pai-layer-knowledge { grid-column: span 1; }
.pai-layer-apps { background: var(--moss); }
.pai-layer-gateway { background: var(--plum); }
.pai-layer-models { background: var(--teal); }
.pai-layer-knowledge { background: var(--slate); }
.pai-layer-gpu { background: var(--forest); }
.pai-layer-hardware { background: var(--stone); }
.pai-layer-frontier { background: var(--orange); }
.pai-layer-security { background: #1B332F; }
.pai-layer-detail { min-height: 150px; margin-top: 4px; padding: 24px 26px; border: 1px solid var(--border-strong); background: var(--surface); }
.pai-layer-detail h3, .pai-phase-detail h3 { margin: 6px 0 10px; font-size: 24px; }
.pai-layer-detail p:not(.pai-detail-zone), .pai-phase-detail p:not(.pai-detail-zone) { color: var(--text-muted); font-size: 16px; line-height: 1.65; }
.pai-detail-zone { color: var(--teal); font-size: 12px; font-weight: 600; letter-spacing: .12em; text-transform: uppercase; }
.pai-layer-detail [hidden], .pai-phase-detail [hidden] { display: none; }

.pai-router { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 80px; align-items: start; }
.pai-router h2 { font-size: clamp(30px, 3.6vw, 42px); line-height: 1.12; }
.pai-router-lede { margin-top: 18px !important; color: var(--text-muted); font-size: 18px; line-height: 1.65; }
.pai-routes { display: grid; gap: 24px; margin-top: 32px; }
.pai-route { padding-left: 20px; border-left: 3px solid var(--teal); }
.pai-route-frontier { border-left-color: var(--orange); }
.pai-route strong { font-family: var(--font-serif); font-size: 21px; font-weight: 600; }
.pai-route p { margin-top: 6px; color: var(--text-muted); font-size: 16px; line-height: 1.6; }
.pai-sim { display: grid; gap: 14px; margin-top: 40px; padding: 26px; border: 1px solid var(--border-strong); background: var(--paper); }
.pai-sim-title { font-size: 12px; font-weight: 700; letter-spacing: .14em; text-transform: uppercase; color: var(--text-soft); }
.pai-sim-prompts { display: grid; gap: 6px; }
.pai-sim-prompt { padding: 11px 14px; border: 1px solid var(--border-strong); border-radius: var(--radius-sm); background: var(--surface); color: var(--ink); font-size: 14.5px; text-align: left; transition: border-color .15s ease, background .15s ease; }
.pai-sim-prompt:hover { border-color: var(--teal); }
.pai-sim-prompt.is-active { border-color: var(--teal); background: var(--teal-soft); font-weight: 600; }
.pai-sim-result { display: grid; gap: 10px; padding: 16px 18px; border-left: 3px solid var(--teal); background: var(--surface); }
.pai-sim-result[hidden] { display: none; }
.pai-sim-frontier { border-left-color: var(--orange); }
.pai-sim-flow { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; font-size: 13px; }
.pai-sim-flow span { padding: 3px 9px; border: 1px solid var(--border-strong); border-radius: 2px; }
.pai-sim-flow i { color: var(--text-soft); font-style: normal; }
.pai-sim-flow b { color: var(--teal-dark); font-weight: 600; }
.pai-sim-frontier .pai-sim-flow b { color: var(--orange); }
.pai-sim-result p { color: var(--text-muted); font-size: 14.5px; line-height: 1.55; }
.pai-sim-result strong { color: var(--ink); }
.pai-sim-result code { display: block; overflow-x: auto; padding: 8px 10px; background: var(--subtle); font-family: var(--font-mono); font-size: 12px; white-space: nowrap; }
.pai-router-side { position: sticky; top: calc(var(--header-h) + 24px); }
.pai-pcb { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 32px; }
.pai-pcb li { display: grid; gap: 6px; padding-top: 14px; border-top: 2px solid var(--ink); }
.pai-pcb strong { font-family: var(--font-serif); font-size: 19px; font-weight: 600; }
.pai-pcb span { color: var(--text-muted); font-size: 14.5px; line-height: 1.5; }

/* ---------- Timeline ---------- */
.pai-gantt { display: grid; gap: 4px; padding: 20px 24px; border: 1px solid var(--border-strong); background: var(--surface); }
.pai-gantt-row { display: grid; grid-template-columns: 230px minmax(0, 1fr); align-items: center; gap: 20px; width: 100%; padding: 10px 12px; border: 0; border-radius: 2px; background: transparent; color: inherit; text-align: left; }
.pai-gantt-phase { transition: background .15s ease; }
.pai-gantt-phase:hover { background: var(--paper); }
.pai-gantt-phase.is-active { background: var(--teal-soft); }
.pai-gantt-head { padding-block: 0 8px; border-bottom: 1px solid var(--border); border-radius: 0; }
.pai-gantt-head .pai-gantt-label { color: var(--text-soft); font-size: 12px; font-weight: 600; letter-spacing: .12em; text-transform: uppercase; }
.pai-gantt-label { display: grid; gap: 2px; }
.pai-gantt-label strong { font-size: 15px; font-weight: 600; }
.pai-gantt-label em { color: var(--text-soft); font-family: var(--font-mono); font-size: 12px; font-style: normal; }
.pai-gantt-track { display: grid; grid-template-columns: repeat(14, minmax(0, 1fr)); align-items: center; gap: 3px; min-height: 30px; background: repeating-linear-gradient(90deg, var(--border) 0, var(--border) 1px, transparent 1px, transparent calc(100% / 14)); }
.pai-gantt-head .pai-gantt-track { min-height: 0; background: none; }
.pai-gantt-head .pai-gantt-track span { color: var(--text-soft); font-family: var(--font-mono); font-size: 12px; text-align: center; }
.pai-gantt-bar { display: block; grid-row: 1; min-height: 26px; padding: 4px 10px; overflow: hidden; border-radius: 2px; color: #fff; font-size: 12px; font-weight: 600; line-height: 18px; white-space: nowrap; }
.pai-bar-cyan { background: var(--teal); }
.pai-bar-amber { background: var(--orange); }
.pai-bar-blue { background: var(--slate); }
.pai-bar-violet { background: var(--plum); }
.pai-bar-green { background: var(--moss); }
.pai-bar-slate { background: var(--stone); }
.pai-phase-detail { margin-top: 16px; padding: 26px 28px; border: 1px solid var(--border-strong); border-left: 3px solid var(--teal); background: var(--surface); }
.pai-phase-detail .pai-dash-list { margin-top: 18px; max-width: 560px; }
.pai-timeline-figure { margin-top: 64px; }
.pai-run { display: grid; grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr); gap: 80px; margin-top: 88px; padding-top: 40px; border-top: 2px solid var(--ink); }
.pai-run h3 { font-size: 30px; }
.pai-run header p:last-child { margin-top: 10px; color: var(--text-muted); font-size: 17px; }
.pai-run ul { display: grid; grid-template-columns: 1fr 1fr; column-gap: 40px; }
.pai-run li { display: grid; gap: 4px; padding: 16px 0 18px; border-top: 1px solid var(--border); }
.pai-run li:nth-child(-n+2) { border-top: 0; padding-top: 0; }
.pai-run li strong { font-size: 16px; font-weight: 600; }
.pai-run li span { color: var(--text-muted); font-size: 15px; line-height: 1.55; }

/* ---------- Deck viewer ---------- */
.pai-carousel { display: grid; gap: 16px; }
.pai-carousel-bar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px; }
.pai-carousel-count { color: rgba(255, 255, 255, .75); font-size: 14px; }
.pai-carousel-count span { color: #fff; font-weight: 600; }
.pai-jump { display: inline-flex; align-items: center; gap: 10px; color: rgba(255, 255, 255, .75); font-size: 13px; }
.pai-jump select { max-width: 280px; padding: 9px 12px; border: 1px solid rgba(255, 255, 255, .3); border-radius: var(--radius-sm); background: var(--dark); color: #fff; font-size: 14px; }
.pai-carousel-tools { display: flex; gap: 8px; }
.pai-icon-btn { display: inline-grid; place-items: center; width: 40px; height: 40px; padding: 0; border: 1px solid rgba(255, 255, 255, .3); border-radius: var(--radius-sm); background: transparent; color: #fff; transition: background .15s ease, border-color .15s ease; }
.pai-icon-btn:hover:not(:disabled) { background: rgba(255, 255, 255, .12); border-color: #fff; }
.pai-icon-btn:disabled { opacity: .35; cursor: not-allowed; }
.pai-icon-btn[hidden] { display: none; }
.pai-stage { position: relative; display: grid; place-items: center; background: #000; }
.pai-stage:fullscreen { width: 100%; height: 100%; }
.pai-stage-frame { width: 100%; overflow: hidden; background: #fff; }
.pai-stage:fullscreen .pai-stage-frame { width: auto; max-width: 100%; aspect-ratio: 16 / 9; height: min(100%, 56.25vw); }
.pai-stage-frame img { display: block; width: 100%; height: auto; }
.pai-nav { position: absolute; top: 50%; z-index: 2; display: grid; place-items: center; width: 46px; height: 46px; padding: 0; border: 0; border-radius: var(--radius-sm); background: rgba(15, 29, 27, .88); color: #fff; transform: translateY(-50%); transition: background .15s ease; }
.pai-nav:hover { background: var(--teal); }
.pai-nav-prev { left: 12px; }
.pai-nav-next { right: 12px; }
.pai-stage-caption { display: grid; gap: 2px; color: rgba(255, 255, 255, .72); font-size: 15px; }
.pai-stage-caption strong { color: #fff; font-family: var(--font-serif); font-size: 20px; font-weight: 600; }
.pai-thumbs { display: flex; gap: 10px; padding: 4px 2px 10px; overflow-x: auto; scroll-snap-type: x proximity; scrollbar-width: thin; scrollbar-color: rgba(255, 255, 255, .3) transparent; }
.pai-thumbs li { flex: 0 0 auto; scroll-snap-align: center; }
.pai-thumb { position: relative; display: block; width: 148px; padding: 0; overflow: hidden; border: 2px solid transparent; border-radius: 2px; background: #fff; opacity: .55; transition: opacity .15s ease, border-color .15s ease; }
.pai-thumb img { display: block; width: 100%; height: auto; }
.pai-thumb span { position: absolute; left: 6px; bottom: 6px; min-width: 20px; padding: 1px 6px; background: var(--dark); color: #fff; font-size: 11px; font-weight: 600; text-align: center; }
.pai-thumb:hover { opacity: 1; }
.pai-thumb.is-active { border-color: #5FC2B5; opacity: 1; }

/* ---------- Lightbox ---------- */
.pai-lightbox { width: 100vw; max-width: none; height: 100dvh; max-height: none; margin: 0; padding: 0; border: 0; background: #0A1413; color: #fff; }
.pai-lightbox[open] { display: grid; grid-template-rows: auto minmax(0, 1fr) auto; }
.pai-lightbox::backdrop { background: rgba(0, 0, 0, .86); }
.pai-lb-bar { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 12px 18px; border-bottom: 1px solid var(--dark-line); }
.pai-lb-title { display: flex; align-items: baseline; gap: 12px; min-width: 0; font-size: 15px; }
.pai-lb-title strong { overflow: hidden; font-family: var(--font-serif); font-size: 18px; font-weight: 600; text-overflow: ellipsis; white-space: nowrap; }
.pai-lb-title span { color: rgba(255, 255, 255, .6); font-size: 13px; }
.pai-lb-tools { display: flex; align-items: center; gap: 8px; }
.pai-lb-level { min-width: 46px; color: rgba(255, 255, 255, .7); font-size: 13px; text-align: center; }
.pai-lb-stage { position: relative; min-height: 0; }
.pai-lb-scroll { display: grid; width: 100%; height: 100%; overflow: auto; place-items: center; padding: 12px 72px; }
.pai-lightbox.is-zoomed .pai-lb-scroll { place-items: start; }
.pai-lb-img { display: block; max-width: none; height: auto; background: #fff; }
.pai-lightbox.is-zoomed .pai-lb-img { max-height: none; }
.pai-lightbox:not(.is-zoomed) .pai-lb-img { max-width: 100%; max-height: 100%; aspect-ratio: 16 / 9; object-fit: contain; width: min(100%, calc((100dvh - 190px) * 16 / 9)); }
.pai-lightbox .pai-nav-prev { left: 14px; }
.pai-lightbox .pai-nav-next { right: 14px; }
.pai-lb-foot { display: grid; gap: 10px; padding: 12px 18px 16px; border-top: 1px solid var(--dark-line); }
.pai-lb-caption { color: rgba(255, 255, 255, .7); font-size: 14px; text-align: center; }
.pai-lb-jump { display: flex; flex-wrap: wrap; justify-content: center; gap: 6px; margin: 0; padding: 0; list-style: none; }
.pai-lb-jump button { min-width: 34px; height: 30px; padding: 0 8px; border: 1px solid rgba(255, 255, 255, .25); border-radius: 2px; background: transparent; color: rgba(255, 255, 255, .7); font-size: 13px; }
.pai-lb-jump button:hover { border-color: #fff; color: #fff; }
.pai-lb-jump button.is-active { border-color: #5FC2B5; background: var(--teal); color: #fff; }

/* ---------- Commercial ---------- */
.pai-tiers { display: grid; grid-template-columns: repeat(3, 1fr); gap: 48px; }
.pai-tiers li { padding-top: 26px; border-top: 2px solid var(--ink); }
.pai-tiers .pai-num { display: block; font-size: 44px; line-height: 1; }
.pai-tiers h3 { margin-top: 20px; font-size: 26px; }
.pai-tier-model { margin-top: 8px !important; color: var(--orange); font-size: 12.5px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; }
.pai-tiers p:last-child { margin-top: 14px; color: var(--text-muted); font-size: 16px; line-height: 1.65; }
.pai-why { margin-top: 96px; }
.pai-why h3 { margin-bottom: 28px; font-size: 30px; }
.pai-why ul { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; }
.pai-why li { padding-top: 16px; border-top: 1px solid var(--border-strong); }
.pai-why strong { font-size: 16px; font-weight: 600; }
.pai-why p { margin-top: 8px; color: var(--text-muted); font-size: 15px; line-height: 1.6; }
.pai-cta { background: var(--teal); color: #fff; }
.pai-cta-inner { display: grid; grid-template-columns: minmax(0, 1.5fr) auto; align-items: center; gap: 64px; padding: 88px 0; }
.pai-cta .eyebrow { color: rgba(255, 255, 255, .8); }
.pai-cta h2 { max-width: 700px; color: #fff; font-size: clamp(30px, 3.8vw, 44px); line-height: 1.12; }
.pai-cta-inner p:not(.eyebrow) { max-width: 620px; margin-top: 18px; color: rgba(255, 255, 255, .88); font-size: 17px; line-height: 1.65; }
.pai-cta-actions { display: grid; justify-items: start; gap: 16px; }
.pai-cta-button { background: #fff; color: var(--teal-dark); }
.pai-cta-button:hover { background: var(--ink); color: #fff; }
.pai-cta-actions a { color: rgba(255, 255, 255, .9); font-size: 14px; text-decoration: underline; text-underline-offset: 4px; }

/* ---------- Intake drawer ---------- */
.pai-drawer { position: fixed; inset: 0 0 0 auto; width: min(540px, 100%); max-width: none; height: 100dvh; max-height: none; margin: 0; padding: 0; border: 0; border-left: 1px solid var(--border-strong); background: var(--paper); color: var(--ink); box-shadow: -24px 0 60px rgba(15, 29, 27, .25); }
.pai-drawer[open] { animation: pai-slide-in .25s ease-out both; }
.pai-drawer::backdrop { background: rgba(15, 29, 27, .55); }
@keyframes pai-slide-in { from { transform: translateX(32px); opacity: 0; } }
.pai-drawer-panel { display: grid; gap: 24px; align-content: start; min-height: 100%; padding: 32px; }
.pai-drawer-head { display: flex; align-items: start; justify-content: space-between; gap: 16px; padding-bottom: 20px; border-bottom: 2px solid var(--ink); }
.pai-drawer-head .eyebrow { margin-bottom: 10px; }
.pai-drawer-head h2 { font-size: 28px; line-height: 1.15; }
.pai-drawer .pai-icon-btn { border-color: var(--border-strong); color: var(--ink); }
.pai-drawer .pai-icon-btn:hover:not(:disabled) { background: var(--subtle); border-color: var(--ink); }
.pai-form { display: grid; gap: 20px; }
.pai-form[hidden], .pai-result[hidden] { display: none; }
.pai-field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.pai-field { display: grid; align-content: start; gap: 6px; min-width: 0; margin: 0; padding: 0; border: 0; }
.pai-field label, .pai-field legend { padding: 0; font-size: 14px; font-weight: 600; }
.pai-field label span, .pai-field legend span { color: var(--text-soft); font-weight: 400; }
.pai-field input[type="text"], .pai-field input[type="email"], .pai-field input[type="number"], .pai-field select, .pai-field textarea { width: 100%; min-height: 46px; padding: 10px 12px; border: 1px solid var(--border-strong); border-radius: var(--radius-sm); background: var(--surface); color: var(--ink); font: inherit; font-size: 15px; }
.pai-field textarea { resize: vertical; }
.pai-field input:focus, .pai-field select:focus, .pai-field textarea:focus { border-color: var(--teal); outline: none; box-shadow: var(--ring); }
.pai-field [aria-invalid="true"] { border-color: #B42318; }
.pai-choice-group { gap: 8px; }
.pai-choice-group legend { margin-bottom: 4px; }
.pai-choice { display: flex; align-items: flex-start; gap: 12px; padding: 12px 14px; border: 1px solid var(--border-strong); border-radius: var(--radius-sm); background: var(--surface); cursor: pointer; transition: border-color .15s ease, background .15s ease; }
.pai-choice:has(input:checked) { border-color: var(--teal); background: var(--teal-soft); }
.pai-choice input { margin-top: 4px; accent-color: var(--teal); }
.pai-choice span { display: grid; gap: 2px; }
.pai-choice em { color: var(--text-soft); font-size: 13px; font-style: normal; font-weight: 400; }
.pai-check-row { grid-auto-flow: column; justify-content: start; gap: 20px; align-items: center; }
.pai-check-row legend { grid-column: 1 / -1; float: none; margin-bottom: 4px; }
.pai-check { display: inline-flex; align-items: center; gap: 8px; font-weight: 400 !important; }
.pai-check input { accent-color: var(--teal); }
.pai-error { color: #B42318; font-size: 13px; }
.pai-error:empty { display: none; }
.pai-error-form { padding: 10px 12px; background: #FDECEA; border-left: 3px solid #B42318; font-size: 14px; }
.pai-hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.pai-result { display: grid; gap: 18px; }
.pai-result h3 { font-size: 28px; }
.pai-result-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0 24px; margin: 0; }
.pai-result-grid div { padding: 14px 0; border-top: 1px solid var(--border-strong); }
.pai-result-grid dt { color: var(--text-soft); font-size: 12px; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; }
.pai-result-grid dd { margin: 6px 0 0; font-family: var(--font-serif); font-size: 21px; font-weight: 600; }
.pai-result > p { color: var(--text-muted); font-size: 15px; line-height: 1.6; }
.pai-result > p.pai-fineprint { font-size: 12.5px; }

/* ---------- Responsive ---------- */
@media (max-width: 1040px) {
  .pai-section { padding: 88px 0; }
  .pai-hero-grid { grid-template-columns: 1fr; gap: 48px; padding-top: calc(var(--header-h) + 48px); }
  .pai-tiles { max-width: 520px; }
  .pai-split, .pai-solution, .pai-arch, .pai-router, .pai-run { grid-template-columns: 1fr; gap: 40px; }
  .pai-solution { row-gap: 8px; }
  .pai-solution .eyebrow, .pai-solution-text, .pai-solution-sub { grid-column: 1; grid-row: auto; }
  .pai-arch-figure, .pai-router-side { position: static; }
  .pai-offers { column-gap: 40px; }
  .pai-why ul { grid-template-columns: 1fr 1fr; }
  .pai-cta-inner { grid-template-columns: 1fr; gap: 32px; padding: 72px 0; }
}
@media (max-width: 760px) {
  .pai-section { padding: 72px 0; }
  .pai-head-row { display: block; }
  .pai-head-row .button { margin-top: 20px; }
  .pai-metrics { grid-template-columns: 1fr; }
  .pai-metrics li, .pai-metrics li:first-child { padding: 24px 0; border-left: 0; border-top: 1px solid var(--dark-line); }
  .pai-metrics li:first-child { border-top: 0; }
  .pai-dilemma, .pai-trifecta, .pai-pair, .pai-offers, .pai-tiers, .pai-why ul, .pai-run ul, .pai-pcb { grid-template-columns: 1fr; }
  .pai-offer:nth-child(2) { border-top: 1px solid var(--border-strong); }
  .pai-run li:nth-child(2) { border-top: 1px solid var(--border); padding-top: 16px; }
  .pai-actions .button { width: 100%; }
  .pai-tile { padding: 16px; }
  .pai-tile strong { font-size: 18px; }
  .pai-gantt { padding: 12px; }
  .pai-gantt-row { grid-template-columns: 1fr; gap: 6px; }
  .pai-gantt-head .pai-gantt-label { display: none; }
  .pai-gantt-label { grid-auto-flow: column; justify-content: space-between; align-items: baseline; }
  .pai-gantt-bar { padding-inline: 4px; font-size: 10px; }
  .pai-field-row, .pai-result-grid { grid-template-columns: 1fr; }
  .pai-check-row { grid-auto-flow: row; }
  .pai-nav { width: 38px; height: 38px; }
  .pai-nav-prev { left: 6px; }
  .pai-nav-next { right: 6px; }
  .pai-thumb { width: 112px; }
  .pai-lb-scroll { padding: 8px; }
  .pai-lightbox:not(.is-zoomed) .pai-lb-img { width: 100%; }
  .pai-lb-title strong { display: none; }
  .pai-drawer-panel { padding: 22px 18px; }
  .pai-perimeter { grid-template-columns: 1fr; }
  .pai-perimeter .pai-layer, .pai-perimeter .pai-layer-models, .pai-perimeter .pai-layer-knowledge { grid-column: auto; }
}
@media (prefers-reduced-motion: reduce) {
  .pai-drawer[open] { animation: none; }
}