/* TEMP-01 only. assets/design-tokens.css is an unchanged corporate snapshot.
   Typography, spacing, radii, artwork and easing follow the current Home panel. */
:root {
  --temp-ink: var(--ink); --temp-muted: #535d70; --temp-surface: var(--panel);
  --temp-action: var(--action); --temp-action-ink: var(--ivory); --temp-focus: var(--focus);
  --temp-line: var(--line); --temp-field: var(--ivory);
  --temp-hero-art: url("assets/satin-hero-light.svg");
  --temp-page-art: url("assets/satin-scene-light.svg");
  --temp-radius: 72px; --temp-end: 22px;
  font-family: var(--font); color: var(--temp-ink); background: var(--graphite);
  -webkit-font-smoothing: antialiased;
}
:root[data-theme="dark"] { --temp-muted: #c3cbde; --temp-action-ink: var(--graphite); --temp-field: #242938; --temp-hero-art: url("assets/bt-hero-architecture.svg"); --temp-page-art: url("assets/bt-global-1920.webp"); }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]):not([data-theme="dark"]) { --temp-muted: #c3cbde; --temp-action-ink: var(--graphite); --temp-field: #242938; --temp-hero-art: url("assets/bt-hero-architecture.svg"); --temp-page-art: url("assets/bt-global-1920.webp"); }
}
*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; font: 16px/1.6 var(--font); background: var(--graphite) var(--temp-page-art) center top / max(100%, 1100px) auto no-repeat; }
:root[data-theme="dark"] body { --temp-scene-height: max(56.25vw, 618.75px); background-color: #0c192c; background-image: linear-gradient(to bottom,transparent calc(var(--temp-scene-height) - 140px),#0c192c var(--temp-scene-height)),var(--temp-page-art); background-size: 100% var(--temp-scene-height),max(100%,1100px) auto; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]):not([data-theme="dark"]) body { --temp-scene-height: max(56.25vw, 618.75px); background-color: #0c192c; background-image: linear-gradient(to bottom,transparent calc(var(--temp-scene-height) - 140px),#0c192c var(--temp-scene-height)),var(--temp-page-art); background-size: 100% var(--temp-scene-height),max(100%,1100px) auto; }
}
button, input { font: inherit; }
button, input, a { touch-action: manipulation; }
::selection { background: var(--blue); color: var(--ivory); }
.landing {
  max-width: calc(var(--site-width) + var(--page-inset) * 2);
  min-height: 100vh; min-height: 100svh; margin: 0 auto;
  padding: max(18px, env(safe-area-inset-top)) max(var(--page-inset), env(safe-area-inset-right)) max(24px, env(safe-area-inset-bottom)) max(var(--page-inset), env(safe-area-inset-left));
  display: grid; grid-template-rows: auto 1fr auto; gap: 24px;
}
.brand { display: flex; align-items: center; gap: 24px; min-height: 56px; padding-left: calc(var(--panel-inset) - 8px); color: var(--ivory); animation: enter 460ms var(--precision-ease) backwards; }
.brand img { width: 184px; height: auto; display: block; }
.brand-descriptor { display: none; color: var(--on-graphite-muted); font-size: 10px; letter-spacing: .12em; line-height: 1.5; }
.hero {
  position: relative; isolation: isolate; align-self: center; display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  grid-template-areas: "content identity"; align-items: center;
  background: var(--temp-surface); color: var(--temp-ink);
  border: 1px solid var(--temp-line); border-radius: var(--temp-radius) var(--temp-end) 3px 3px;
}
.hero::before { content: ""; position: absolute; inset: 0; z-index: -1; border-radius: inherit; background: var(--temp-hero-art) center / 100% 100% no-repeat; pointer-events: none; }
.hero-content { grid-area: content; min-width: 0; padding: 48px 24px 34px var(--panel-inset); }
.identity-panel { grid-area: identity; display: flex; align-items: center; justify-content: center; padding: 40px; }
.identity-panel img { display: block; width: min(74%, 300px); height: auto; animation: enter 460ms var(--precision-ease) 40ms backwards; }
.eyebrow { display: flex; align-items: center; gap: 14px; margin: 0; color: var(--temp-ink); font-size: 12px; font-weight: 700; letter-spacing: .075em; line-height: 1.55; animation: enter 460ms var(--precision-ease) 160ms backwards; }
.eyebrow::before { content: ""; width: 7px; height: 22px; border-radius: 4px; background: linear-gradient(112deg, #97a9eb, var(--blue) 45%, #4e5db3); box-shadow: inset 1px 1px 0 rgb(247 248 252 / .3); flex-shrink: 0; }
h1 { margin: 22px 0; font-size: clamp(28px, 4.8vw, 68px); font-weight: 750; line-height: 1.065; letter-spacing: -.035em; }
h1 span { display: block; animation: enter 460ms var(--precision-ease) 200ms backwards; }
h1 span + span { animation-delay: 240ms; }
.supporting { max-width: 540px; margin: 0; color: var(--temp-muted); font-size: 17px; line-height: 1.7; animation: enter 460ms var(--precision-ease) 280ms backwards; }
.notify { max-width: 520px; margin-top: 28px; animation: enter 460ms var(--precision-ease) 320ms backwards; }
.form-intro { margin: 0 0 14px; color: var(--temp-muted); font-size: 13px; line-height: 1.65; }
fieldset { border: 0; padding: 0; margin: 0; min-width: 0; }
label { display: block; margin-bottom: 7px; font-size: 11px; line-height: 1.5; font-weight: 550; color: var(--temp-ink); }
.form-controls { display: flex; align-items: stretch; gap: 12px; }
input { width: 100%; min-width: 0; min-height: 54px; border: 1px solid var(--temp-line); border-radius: 10px; padding: 13px 16px; background: var(--temp-field); color: var(--temp-ink); font-size: 16px; line-height: 1.4; }
input::placeholder { opacity: 1; color: var(--temp-muted); }
button { display: inline-flex; flex-shrink: 0; justify-content: space-between; align-items: center; gap: 20px; min-height: 54px; border: 1px solid var(--temp-action); border-radius: 10px; padding: 13px 22px; font-size: 16px; font-weight: 650; line-height: 1.4; cursor: pointer; color: var(--temp-action-ink); background: var(--temp-action); background-image: linear-gradient(112deg,rgb(247 248 252 / .08),transparent 58%,rgb(36 41 56 / .08)); box-shadow: inset 0 1px 0 rgb(247 248 252 / .3); }
button span { font-size: 23px; line-height: 1; }
button:hover { filter: brightness(.96); }
button:disabled { cursor: default; }
button:disabled span { visibility: hidden; }
input:focus-visible, button:focus-visible, a:focus-visible { outline: 3px solid var(--temp-focus); outline-offset: 5px; }
input[aria-invalid="true"] { border-color: var(--temp-focus); border-width: 2px; padding: 12px 15px; }
.form-status { min-height: 3.3em; margin: 12px 0 0; color: var(--temp-muted); font-size: 11px; line-height: 1.65; }
.form-status[data-state="success"], .form-status[data-state="error"] { color: var(--temp-ink); }
.no-script { color: var(--temp-muted); font-size: 12px; margin: 10px 0 0; }
.footer { display: flex; align-items: center; justify-content: space-between; gap: 24px; min-width: 0; padding: 0; color: #dce3f3; animation: enter 460ms var(--precision-ease) 440ms backwards; }
.footer small { font-size: 11px; line-height: 1.7; }
.contact { display: flex; align-items: center; gap: 20px; font-size: 11px; }
.contact > span { color: var(--on-graphite-muted); }
.email { display: inline-flex; align-items: center; gap: 24px; min-height: 44px; padding: 10px 0; color: var(--ivory); font-size: 12px; line-height: 1.5; text-decoration: none; text-underline-offset: 5px; }
.email span { color: var(--on-graphite-action); font-size: 20px; line-height: 1; }
.email:hover { text-decoration: underline; }
.notify:focus-within, .footer:focus-within { animation: none; }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
@keyframes enter { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

/* A reuses the existing Graphite Contact surface; C uses the Ivory Home surface.
   B preserves Home's split artwork and follows the system appearance. */
[data-concept="a"] { --temp-ink: #f7f8fc; --temp-muted: #c3cbde; --temp-surface: #242938; --temp-action: #b1bcff; --temp-focus: #b1bcff; --temp-line: #4a5369; }
[data-concept="a"] .hero::before { background-image: linear-gradient(117deg,rgb(247 248 252 / .035),transparent 50%,rgb(101 116 205 / .045)); }
[data-concept="c"] .hero { grid-template-columns: minmax(0, 1fr) minmax(0, 1.35fr); grid-template-areas: "identity content"; }
[data-concept="c"] .hero-content { padding-right: var(--panel-inset); padding-left: 24px; }
[data-concept="c"] .hero::before { background: radial-gradient(ellipse at 7% 0%,rgb(255 255 255 / .55),transparent 62%),linear-gradient(125deg,rgb(255 255 255 / .18),transparent 46%,rgb(101 116 205 / .025)); }
/* Center B's symbol between the artwork's upper rule (42/620) and lower
   shelf (474/620), leaving clear space inside the right-hand field. */
@media (min-width: 701px) {
  [data-concept="b"] .identity-panel {
    grid-area: auto; position: absolute; top: 6.774194%; bottom: 23.548387%; left: 66%; right: 0;
    padding: clamp(20px, 2vw, 32px);
  }
  [data-concept="b"] .identity-panel img { width: min(76%, 270px); }
}
@media (max-width: 1100px) {
  .hero-content { padding-top: 36px; padding-bottom: 28px; }
  .identity-panel { padding: 24px; }
  .supporting { font-size: 16px; }
  button { gap: 12px; padding-inline: 16px; font-size: 14px; }
  .form-controls { gap: 10px; }
}
@media (max-width: 800px) and (min-width: 701px) {
  .hero, [data-concept="a"] .hero { grid-template-columns: minmax(0, 1.5fr) minmax(0, .8fr); }
  [data-concept="c"] .hero { grid-template-columns: minmax(0, .8fr) minmax(0, 1.5fr); }
  .hero-content { padding-left: 28px; }
  [data-concept="c"] .hero-content { padding-right: 28px; }
  .form-controls { flex-direction: column; }
  .identity-panel { padding: 16px; }
}
@media (max-width: 700px) {
  :root { --page-inset: 14px; --panel-inset: 28px; --temp-radius: 44px; --temp-end: 14px; }
  .landing { padding-top: max(12px, env(safe-area-inset-top)); padding-bottom: max(20px, env(safe-area-inset-bottom)); gap: 20px; }
  .brand { gap: 16px; padding-left: 15px; }
  .brand img { width: 160px; }
  .brand-descriptor { font-size: 9px; letter-spacing: .075em; }
  .hero, [data-concept="a"] .hero, [data-concept="c"] .hero { grid-template-columns: 1fr; grid-template-areas: "identity" "content"; }
  .identity-panel { padding: 28px var(--panel-inset) 0; }
  .identity-panel img { width: 96px; }
  .hero-content, [data-concept="c"] .hero-content { padding: 25px var(--panel-inset) 22px; }
  .hero::before { background-image: url("assets/satin-hero-mobile-light.svg"); }
  [data-concept="b"] .hero::before { background-position: center 0; background-size: 100% 100%; }
  .eyebrow { font-size: 10px; gap: 12px; }
  .eyebrow::before { height: 18px; width: 6px; }
  h1 { font-size: clamp(28px, 8vw, 43px); margin: 20px 0; line-height: 1.09; }
  .supporting { font-size: 15px; line-height: 1.65; }
  .notify { margin-top: 24px; }
  .form-intro { font-size: 12px; margin-bottom: 12px; }
  .form-controls { flex-direction: column; gap: 10px; }
  button { font-size: 16px; padding-inline: 19px; min-height: 52px; }
  input { min-height: 52px; }
  .form-status { min-height: 4.95em; }
  .footer { flex-wrap: wrap; align-items: start; gap: 2px 20px; }
  .footer small { font-size: 10px; }
  .contact { gap: 14px; }
}
@media (max-width: 380px) {
  :root { --panel-inset: 23px; }
  .brand { padding-left: 10px; gap: 10px; }
  .brand img { width: 144px; }
  .brand-descriptor { font-size: 8px; }
  .identity-panel img { width: 84px; }
  .footer { display: block; }
}
@media (max-height: 800px) and (min-width: 801px) {
  .landing { gap: 16px; padding-top: 12px; padding-bottom: 16px; }
  .hero-content { padding-top: 30px; padding-bottom: 24px; }
  h1 { font-size: clamp(28px, 4.4vw, 60px); margin-block: 20px; }
  .notify { margin-top: 24px; }
}
@media (prefers-color-scheme: dark) {
  [data-concept="b"] { --temp-surface: #152844; --temp-ink: #f7f8fc; --temp-muted: #c3cbde; --temp-line: #4a5369; }
  [data-concept="b"] .hero::before { background-image: url("assets/bt-hero-architecture.svg"); }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}

/* Mobile refinement: centered header and a compact symbol beside the headline. */
@media (max-width: 700px) {
  .brand { justify-content: center; padding-left: 0; gap: 0; }
  .brand-descriptor { display: none; }
  .hero, [data-concept="b"] .hero { grid-template-areas: "content"; }
  .hero-content { padding-top: 34px; }
  .headline-row { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: clamp(12px, 3.6vw, 18px); align-items: center; }
  .headline-row h1 { font-size: clamp(24px, 6.5vw, 40px); }
  .headline-row .identity-panel { grid-area: auto; padding: 0; width: clamp(48px, 16vw, 80px); }
  .headline-row .identity-panel img { width: 100%; }
  .footer { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px; text-align: center; }
  .footer small { display: block; width: 100%; }
  .contact { justify-content: center; align-items: center; gap: 12px; }
  .email { gap: 12px; }
}