/* The light interior theme (Option F, approved 2026-09-09): white ground, navy ink, one blue, under the dark picture
   hero. Every solution = what it does (description + points) · a framed showcase in its natural orientation · the
   use case beside it · what it is built from. Loaded after site.css by pages that set body.dx. */
.dx { --switch-h: 0px; --paper: #FFFFFF; --paper-2: #F4F7FB; --paper-3: #E9EFF8; --ink: #0A1A33; --ink-2: #33415C; --ink-3: #5B6B85; --line: #D9E1EC; --line-2: #C3CEDF; --blue: #1E5EFF; --blue-deep: #0B3FBF; --blue-soft: #EAF0FF; --navy: #0B1F3A; --gold: #D4A843;
  --screen: #0B0D12; --bezel: #14171E; --screen-line: #1B1F28;
  background: var(--paper); color: var(--ink); font-family: Inter, system-ui, sans-serif; overflow-x: clip; padding-top: 0; }
.dx #bar { background: transparent; border-bottom-color: transparent; backdrop-filter: none; transition: background-color .35s ease, border-color .35s ease; }
.dx.scrolled #bar { background: rgba(8,9,12,.96); border-bottom-color: #262B35; }   /* clip, not hidden: the body must not become a scroll container or nothing sticks */
.dx main { display: block; }
:where(.dx) :is(h1, h2, h3) { font-family: "Space Grotesk", Inter, sans-serif; letter-spacing: -.02em; line-height: 1.08; color: var(--ink); margin: 0; }
:where(.dx) p { margin: 0; }
:where(.dx) ul, :where(.dx) ol { margin: 0; padding: 0; list-style: none; }
:where(.dx #main) a { color: var(--blue-deep); }
.dx-wrap { width: min(1200px, 100% - 40px); margin-inline: auto; }
@media (min-width: 1100px) { .dx-wrap, .dx-hero-inner { width: min(1520px, 100% - 96px); } }
.dx-kicker { font: 500 11px/1.5 ui-monospace, Menlo, monospace; letter-spacing: .22em; text-transform: uppercase; color: var(--blue); margin-bottom: 14px; }
.dx-code { font: 600 11px/1.5 ui-monospace, Menlo, monospace; letter-spacing: .18em; text-transform: uppercase; color: var(--sig, var(--blue)); }
.dx-band { background: var(--paper-2); }
.dx-btn { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 12px 22px; border-radius: 999px; background: var(--blue); color: #fff; text-decoration: none; font-weight: 600; font-size: 15px; border: 1px solid var(--blue); }
.dx-btn:hover { background: var(--blue-deep); }
.dx-btn-ghost { background: transparent; color: var(--ink); border-color: var(--line-2); }
.dx-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 22px; }
.dx-fine { color: var(--ink-3); font-size: 13px; margin-top: 32px; }

/* ---- the dark hero, heading in the lower left (D, F) or centred (E) ---- */
.dx-hero { position: relative; overflow: hidden; background: #08090C; color: #F4F6F9; min-height: calc(72svh + var(--bar-h)); padding-top: var(--bar-h); box-sizing: border-box; display: flex; align-items: flex-end; }
.dx-hero-img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center 40%; }
.dx-hero::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(8,9,12,.72) 0%, rgba(8,9,12,.22) 22%, rgba(8,9,12,.35) 50%, rgba(8,9,12,.92) 100%); }
.dx-hero-inner { position: relative; z-index: 1; width: min(1200px, 100% - 40px); margin: 0 auto; padding: 24svh 0 56px; }
.dx-hero .dx-eyebrow { font: 500 11px/1.5 ui-monospace, Menlo, monospace; letter-spacing: .24em; text-transform: uppercase; color: var(--gold); margin-bottom: 14px; }
.dx-hero h1 { color: #fff; font-size: clamp(34px, 6.2vw, 72px); max-width: 16ch; text-shadow: 0 2px 24px rgba(0,0,0,.6); }
.dx-hero .dx-lead { color: #E6EBF2; font-size: clamp(16px, 1.4vw, 20px); line-height: 1.5; max-width: 46ch; margin-top: 18px; }
.dx-hero .dx-signal { margin-top: 22px; padding-left: 14px; border-left: 2px solid var(--gold); color: #fff; font-family: "Space Grotesk", Inter, sans-serif; font-weight: 500; font-size: clamp(17px, 1.6vw, 22px); max-width: 30ch; }
@media (min-width: 880px) { .dx-hero { min-height: calc(84svh + var(--bar-h)); align-items: center; } .dx-hero-inner { padding: 120px 0; } .dx-hero-e .dx-hero-inner { text-align: center; } .dx-hero-e h1, .dx-hero-e .dx-lead { margin-inline: auto; } .dx-hero-e .dx-signal { margin-inline: auto; border-left: 0; padding-left: 0; padding-top: 14px; border-top: 2px solid var(--gold); display: inline-block; } .dx-hero-d .dx-hero-inner, .dx-hero-f .dx-hero-inner { padding-top: 26svh; align-self: flex-end; } }

/* ---- the challenge ---- */
.dx-challenge { padding: 56px 0; }
.dx-split { display: grid; gap: 20px; }
.dx-split > * { min-width: 0; }
.dx-challenge h2 { font-size: clamp(28px, 3.4vw, 44px); max-width: 14ch; }
.dx-paras { display: grid; gap: 14px; color: var(--ink-2); font-size: 17px; line-height: 1.6; max-width: 60ch; }
@media (min-width: 880px) { .dx-challenge { padding: 88px 0; } .dx-split { grid-template-columns: 1fr 1.4fr; gap: 56px; align-items: start; } }

/* ---- the solutions: shared parts ---- */
.sol-k { font: 500 11px/1.5 ui-monospace, Menlo, monospace; letter-spacing: .22em; text-transform: uppercase; color: var(--ink-3); }
.s-meta { display: flex; align-items: baseline; gap: 8px; font-family: ui-monospace, Menlo, monospace; }
.s-meta b { font-family: "Space Grotesk", Inter, sans-serif; font-size: 30px; line-height: 1; font-weight: 700; color: var(--blue); }
.s-meta span { font-size: 12px; color: var(--ink-3); }
.s-meta em { font-style: normal; font-size: 11px; font-weight: 600; letter-spacing: .18em; text-transform: uppercase; color: var(--blue); margin-left: 6px; padding-left: 12px; border-left: 1px solid var(--line-2); }
.sol h3 { font-size: clamp(25px, 2.6vw, 34px); line-height: 1.1; max-width: 20ch; }
.s-lead { font-family: "Space Grotesk", Inter, sans-serif; font-weight: 500; font-size: clamp(17px, 1.5vw, 20px); line-height: 1.4; color: var(--blue-deep); max-width: 50ch; }
.s-desc { font-size: 16px; line-height: 1.65; color: var(--ink-2); max-width: 62ch; }
.s-story { font-size: 15.5px; line-height: 1.65; color: var(--ink-2); max-width: 66ch; }
.sol-does { display: grid; gap: 8px; }
.sol-does li { position: relative; padding-left: 28px; font-size: 15px; line-height: 1.5; color: var(--ink); }
.sol-does li::before { content: ""; position: absolute; left: 0; top: 3px; width: 18px; height: 18px; border-radius: 50%; background: var(--blue-soft); }
.sol-does li::after { content: ""; position: absolute; left: 6px; top: 7px; width: 5px; height: 8px; border-right: 2px solid var(--blue); border-bottom: 2px solid var(--blue); transform: rotate(45deg); }
.sol-does.two { gap: 10px 28px; }
@media (min-width: 720px) { .sol-does.two { grid-template-columns: 1fr 1fr; } }
/* built from */
.built-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.built-chips a { display: inline-flex; align-items: center; min-height: 34px; padding: 6px 12px; border-radius: 999px; border: 1px solid var(--line-2); text-decoration: none; font: 600 11px/1 ui-monospace, Menlo, monospace; letter-spacing: .14em; text-transform: uppercase; color: var(--sig, var(--blue)); background: #fff; }
.built-chips .is-sys a { color: var(--ink); background: var(--paper-2); }
.built-chips a:hover { border-color: var(--blue); }

/* ---- the frames: a window for boards, maps and plans; a phone for the guest-facing threads ---- */
.fr { margin: 0; display: grid; gap: 10px; min-width: 0; }
.fr-shell { background: var(--screen); border: 1px solid var(--screen-line); box-shadow: 0 24px 60px rgba(10,26,51,.18); }
.fr-win .fr-shell { border-radius: 14px; overflow: hidden; }
.fr-bar { display: flex; align-items: center; gap: 10px; height: 38px; padding: 0 14px; background: var(--bezel); border-bottom: 1px solid var(--screen-line); }
.fr-dots { display: inline-flex; gap: 6px; }
.fr-dots span { width: 10px; height: 10px; border-radius: 50%; background: #2A303C; }
.fr-title { font: 500 11px/1 ui-monospace, Menlo, monospace; letter-spacing: .14em; text-transform: uppercase; color: #8A94A3; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.fr-win .fr-screen { height: var(--fh, 300px); padding: 14px; }
.fr-phone { justify-self: center; width: min(300px, 100%); }
.fr-phone .fr-cap { max-width: 300px; }
.fr-phone .fr-shell { background: var(--bezel); border-radius: 38px; padding: 10px; border-color: #262B35; }
.fr-phone .fr-screen { position: relative; background: var(--screen); border-radius: 30px; height: 560px; padding: 44px 12px 16px; overflow: hidden; display: grid; grid-template-rows: auto 1fr; gap: 10px; }
.fr-notch { position: absolute; top: 12px; left: 50%; transform: translateX(-50%); width: 92px; height: 24px; border-radius: 14px; background: var(--bezel); }
.fr-phead { font: 600 12px/1 Inter, system-ui, sans-serif; letter-spacing: .02em; color: #E6EBF2; text-align: center; padding: 6px 0 12px; border-bottom: 1px solid var(--screen-line); }
/* the demo inside a frame: the frame's dark palette, no chrome of its own, fills the screen */
.fr-screen { --surface: #0E1015; --surface-2: #14171E; --surface-inset: #0B0D12; --ink: #F4F6F9; --ink-2: #C3CAD4; --ink-3: #949DA9; --ink-4: #78818D; --line: #262B35; --line-strong: #39404D; --gold: #D4A843; --gold-soft: rgba(212,168,67,.12); --gold-a24: rgba(212,168,67,.24); --ok: #4ADE80; --warn: #FBBF24; --error: #FF8080; contain: inline-size; }
.fr-screen .demo { height: 100%; min-height: 0; border: 0; background: transparent; padding: 0; display: flex; flex-direction: column; align-items: stretch; }
.fr-screen .demo > * { min-height: 0; min-width: 0; }
.fr-screen .demo-cap { display: none; }
.fr-screen .demo-canvas { flex: 1 1 auto; border-radius: 8px; }
.fr-screen [data-demo="guest-thread"] { justify-content: flex-end; }
.fr-screen .d-chat { max-height: none; height: 100%; align-content: end; overflow: hidden; }
.fr-screen .d-queue, .fr-screen .d-col-body { min-height: 0; }
.fr-cap { font-size: 13px; line-height: 1.45; color: var(--ink-3); }
.fr-cap .demo-cap { display: block; font: inherit; letter-spacing: 0; text-transform: none; color: inherit; margin: 0; }
@media (min-width: 880px) { .fr-win .fr-screen { height: var(--fh, 380px); } }
@media (max-width: 879px) { .fr-win .fr-screen { height: min(var(--fh, 380px), 320px); } }

/* ============ the index rail and the solution sheets ============ */
.dossier { display: grid; gap: 24px; padding: 40px 0 64px; }
.dossier > * { min-width: 0; }
.rail { display: block; position: sticky; top: calc(var(--bar-h) + var(--switch-h)); z-index: 30; background: var(--paper-2); margin-inline: calc(50% - 50vw); padding: 10px calc(50vw - 50%); border-bottom: 1px solid var(--line); }
.rail .dx-kicker { display: none; }
.rail ol { display: flex; gap: 6px; overflow-x: auto; scrollbar-width: none; }
.rail a { display: inline-flex; align-items: center; gap: 8px; white-space: nowrap; min-height: 40px; padding: 6px 12px; border-radius: 999px; border: 1px solid var(--line-2); background: #fff; text-decoration: none; color: var(--ink-2); font: 600 11px/1 ui-monospace, Menlo, monospace; letter-spacing: .12em; }
.rail-num { color: var(--blue); }
.rail-title { display: none; }
.rail a.is-on { background: var(--blue); border-color: var(--blue); color: #fff; }
.rail a.is-on .rail-num { color: #fff; }
.dossier-body { display: grid; gap: 22px; }
.sol { scroll-margin-top: calc(var(--bar-h) + var(--switch-h) + 76px); }
.s3 { background: var(--paper); border: 1px solid var(--line); border-radius: 20px; overflow: hidden; }
.s3-head { padding: 26px; display: grid; gap: 14px; background: var(--paper-2); border-bottom: 1px solid var(--line); }
.s3-head > div { display: grid; gap: 10px; }
.s3-row { padding: 22px 26px; border-top: 1px solid var(--line); display: grid; gap: 10px; }
.s3-row:first-of-type { border-top: 0; }
.s3-content { min-width: 0; }
@media (min-width: 880px) {
  .dossier { grid-template-columns: 260px minmax(0, 1fr); gap: 40px; padding: 56px 0 80px; align-items: start; }
  .rail { position: sticky; top: calc(var(--bar-h) + var(--switch-h) + 20px); margin: 0; padding: 0; border: 0; background: transparent; }
  .rail .dx-kicker { display: none; }
  .rail { padding-top: 8px; }
  .rail ol { display: grid; gap: 4px; overflow: visible; }
  .rail a { display: grid; grid-template-columns: 28px 1fr; gap: 2px 8px; white-space: normal; min-height: 0; padding: 8px 10px; border: 0; border-left: 2px solid transparent; border-radius: 0 10px 10px 0; background: transparent; color: var(--ink-3); }
  .rail a:hover { color: var(--ink); background: var(--paper); }
  .rail-code { font-size: 10px; }
  .rail-title { display: block; grid-column: 2; font: 500 13px/1.35 Inter, system-ui, sans-serif; letter-spacing: 0; text-transform: none; color: var(--ink-2); }
  .rail a.is-on { background: transparent; border-left-color: var(--blue); color: var(--blue); border-radius: 0; }
  .rail a.is-on .rail-num { color: var(--blue); }
  .rail a.is-on .rail-title { color: var(--ink); font-weight: 600; }
  .s3-head { grid-template-columns: 170px minmax(0, 1fr); gap: 32px; align-items: start; padding: 34px 40px; }
  .s3-row { grid-template-columns: 170px minmax(0, 1fr); gap: 32px; align-items: start; padding: 26px 40px; }
  .s3 .sol-k { margin-top: 3px; }
  .s3-demo .fr-phone { justify-self: start; }
  .s3 .s-desc, .s3 .s-story { max-width: 74ch; }

}
@media (min-width: 1100px) { .dossier { grid-template-columns: 300px minmax(0, 1fr); gap: 56px; } }
@media (min-width: 1200px) { .s3-head, .s3-row { grid-template-columns: 200px minmax(0, 1fr); gap: 40px; } }

/* ---- numbers, capabilities, cta, footer ---- */
.dx-numbers { padding: 56px 0 48px; }
.dx-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin: 0; }
.dx-stats dt { font-family: "Space Grotesk", Inter, sans-serif; font-weight: 700; font-size: clamp(36px, 5vw, 64px); color: var(--blue); line-height: 1; }
.dx-stats dd { margin: 8px 0 0; color: var(--ink-2); font-size: 14px; }
@media (min-width: 880px) { .dx-numbers { padding: 72px 0 56px; } .dx-stats { grid-template-columns: repeat(4, 1fr); } }
.dx-caps { padding: 56px 0; }
.dx-caps-grid { display: grid; gap: 14px; }
.dx-caps-grid article { border: 1px solid var(--line); border-radius: 16px; padding: 22px; display: grid; gap: 10px; }
.dx-caps-grid h3 { font-size: 20px; }
.dx-caps-grid p:last-child { color: var(--ink-2); font-size: 15px; line-height: 1.55; }
@media (min-width: 880px) { .dx-caps { padding: 80px 0; } .dx-caps-grid { grid-template-columns: repeat(3, 1fr); } }
.dx-cta { background: var(--navy); color: #fff; padding: 64px 0; }
.dx-cta h2 { color: #fff; font-size: clamp(28px, 3.6vw, 48px); max-width: 16ch; }
.dx-cta p { color: #C9D3E3; margin-top: 14px; max-width: 52ch; font-size: 17px; line-height: 1.55; }
.dx-cta .dx-btn-ghost { color: #fff; border-color: rgba(255,255,255,.35); }
.dx-foot { padding: 32px 0 48px; border-top: 1px solid var(--line); color: var(--ink-3); font-size: 13px; }
.dx-foot .dx-wrap { display: grid; gap: 8px; }
.dx-foot a { color: var(--ink-2); text-decoration: none; }


/* the section heading inside the dossier body */
.dossier-h { font-size: 22px; display: grid; gap: 6px; margin: 0 0 4px; }
.dossier-h span { display: block; font: 400 15px/1.5 Inter, system-ui, sans-serif; letter-spacing: 0; color: var(--ink-3); max-width: 60ch; }
.dx-caps-intro { color: var(--ink-2); font-size: 16px; line-height: 1.55; max-width: 60ch; margin: -4px 0 18px; }
.pair-alone { grid-template-columns: 1fr !important; }
/* the site's dark chrome keeps its own palette on the light page */
.dx #bar, .dx #sheet, .dx #site-footer, .dx .wa { --ink: #F4F6F9; --ink-2: #C3CAD4; --ink-3: #949DA9; --ink-4: #78818D; --line: #262B35; --line-strong: #39404D; --surface: #0E1015; --surface-2: #14171E; }
.dx #site-footer { margin-top: 0; }
.dx #site-footer, .dx #sheet, .dx #bar { color: var(--ink); }
.dx #main { display: block; }

/* the site styles a nav::before scroll hint for its old jump nav; the rail has its own index */
.dx .rail::before, .dx .rail::after, .dx .dx-index::before, .dx .dx-index::after { content: none !important; display: none !important; }

/* ---- pages with no picture hero: the header bar is solid from the top ---- */
.dx.dx-solid { padding-top: var(--bar-h); }
.dx.dx-solid #bar { background: rgba(8,9,12,.96); border-bottom-color: #262B35; backdrop-filter: blur(14px); }

/* ---- contact ---- */
.dx-contact-wrap { padding: 48px 0 72px; }
.dx-contact-grid { display: grid; gap: 34px; }
.dx-contact-grid > * { min-width: 0; }
.dx-contact-intro h1 { font-size: clamp(32px, 4.4vw, 56px); max-width: 14ch; }
.dx-lead-dark { margin-top: 16px; font-size: 17px; line-height: 1.55; color: var(--ink-2); max-width: 46ch; }
.dx-contact-intro h2 { margin-top: 38px; font-size: 22px; }
.dx-steps { margin-top: 18px; display: grid; gap: 16px; }
.dx-steps li { display: grid; grid-template-columns: auto 1fr; gap: 16px; align-items: start; }
.s-num { font-family: "Space Grotesk", Inter, sans-serif; font-weight: 700; font-size: 20px; line-height: 1.3; color: var(--blue); }
.dx-steps b { display: block; margin-bottom: 3px; color: var(--ink); }
.dx-steps p { color: var(--ink-2); font-size: 14.5px; line-height: 1.5; }
.dx-direct { margin-top: 30px; font-size: 15px; display: flex; flex-wrap: wrap; align-items: center; gap: 0 8px; }
.dx-direct a { min-height: 44px; display: inline-flex; align-items: center; }
.dx-direct span { color: var(--ink-3); }
/* the form card. site.css styles the dark original — everything below re-dresses it for the white page. */
.dx .contact-form { max-width: none; position: relative; }
.dx-form { background: var(--paper-2); border: 1px solid var(--line); border-radius: 20px; padding: 24px; display: grid; gap: 18px; }
.dx-form .form-fields { display: grid; gap: 18px; }
.dx-form label { display: grid; gap: 6px; font: 600 13px/1.4 Inter, system-ui, sans-serif; letter-spacing: 0; text-transform: none; color: var(--ink); }
.dx-form input, .dx-form select, .dx-form textarea { font: inherit; font-size: 16px; font-weight: 400; padding: 12px 14px; border: 1px solid var(--line-2); border-radius: 10px; background: #fff; color: var(--ink); min-height: 48px; }
.dx-form textarea { resize: vertical; min-height: 150px; }
.dx-form input:focus, .dx-form select:focus, .dx-form textarea:focus { outline: 2px solid var(--blue); outline-offset: 1px; border-color: var(--blue); }
.dx-form .err { color: #B42318; font: 500 12px/1.4 Inter, system-ui, sans-serif; letter-spacing: 0; text-transform: none; min-height: 0; }
.dx-form .err:empty { display: none; }
.dx-form .dx-btn { justify-self: start; }
.dx-form .form-status { color: var(--ink-2); font-size: 14px; }
.dx-form .form-status:empty { display: none; }
.dx-form .form-panel { display: grid; gap: 12px; justify-items: start; }
.dx-form-note { color: var(--ink-3); font-size: 13px; line-height: 1.55; }
.dx-form-note a { color: var(--blue-deep); display: inline-flex; align-items: center; min-height: 44px; }   /* the site's rule: every target at least 44px */
@media (min-width: 880px) {
  .dx-contact-wrap { padding: 72px 0 96px; }
  .dx-contact-grid { grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); gap: 64px; align-items: start; }
  .dx-form { padding: 32px; }
}