/* CASS public site — shared styles
   Layout concept: a dive descent. Each page opens in deep water (dark hero band),
   then surfaces into calm reading bands; one accent (CASS blue) plus the
   vehicle's own yellow, which only ever comes from the images. */
:root {
  --cass-blue: #0B4F6C;
  --abyss: #03111A;
  --deep: #072A3A;
  --bg: #F4F7F9;
  --panel: #E4ECF0;
  --line: #C9D6DD;
  --ink: #111A1F;
  --muted: #55646C;
  --accent: #0B4F6C;
  --accent-ink: #F2F6F8;
  --on-deep: #F2F6F8;
  --on-deep-muted: #9FB3BE;
  --signal: #E9D23A;           /* matches the hull yellow; markers and the primary button only */
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --measure: 66ch;
  --wrap: 1120px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #061C27; --panel: #0A2836; --line: #17394A; --ink: #E8EFF2;
    --muted: #9FB3BE; --accent: #6FB3D2; --accent-ink: #03111A; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #061C27; --panel: #0A2836; --line: #17394A; --ink: #E8EFF2;
  --muted: #9FB3BE; --accent: #6FB3D2; --accent-ink: #03111A; color-scheme: dark;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font: 400 1.0625rem/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-underline-offset: 3px; }
a:focus-visible, button:focus-visible { outline: 2px solid var(--signal); outline-offset: 3px; }
h1, h2, h3 { font-family: var(--serif); font-weight: 700; line-height: 1.15; text-wrap: balance; margin: 0; }
h1 { font-size: clamp(2rem, 1.2rem + 3.2vw, 3.4rem); letter-spacing: -0.01em; }
h2 { font-size: clamp(1.6rem, 1.2rem + 1.4vw, 2.2rem); }
h3 { font-size: 1.25rem; }
p { margin: 0; max-width: var(--measure); }

.wrap {
  max-width: var(--wrap); margin: 0 auto;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}
.eyebrow {
  font: 500 0.78rem/1.3 var(--mono); letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--muted);
}
.deep .eyebrow { color: var(--on-deep-muted); }

/* Header */
.site-head { background: var(--abyss); color: var(--on-deep); }
.site-head .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; padding-block: 14px; }
.brand img { height: 58px; width: auto; }
.nav { display: flex; gap: 4px 20px; flex-wrap: wrap; font-size: 0.95rem; }
.nav a { color: var(--on-deep-muted); text-decoration: none; padding-block: 4px; border-bottom: 2px solid transparent; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--on-deep); border-bottom-color: var(--signal); }

/* Bands */
.band { padding-block: clamp(48px, 7vw, 88px); }
.band + .band { border-top: 1px solid var(--line); }
.deep { background: linear-gradient(180deg, var(--abyss) 0%, var(--deep) 100%); color: var(--on-deep); border-top: 0 !important; }
.deep a { color: #9FD3EA; }
.tint { background: var(--panel); }
.stack { display: grid; gap: 18px; }
.stack-lg { display: grid; gap: 36px; }
.lede { font-size: 1.18rem; color: inherit; }
.deep .lede { color: #D3DFE5; }

/* Hero */
.hero .wrap { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr); gap: 40px; align-items: center; }
.hero-media { position: relative; }
.hero-media img { width: min(100%, 420px); margin-inline: auto; filter: drop-shadow(0 24px 40px rgba(0,0,0,.45)); }
.hero-media figcaption { text-align: center; margin-top: 10px; }
.status {
  display: inline-flex; align-items: center; gap: 8px; width: fit-content;
  font: 500 0.78rem/1 var(--mono); letter-spacing: 0.08em; text-transform: uppercase;
  border: 1px solid rgba(159,179,190,.45); border-radius: 999px; padding: 7px 12px; color: var(--on-deep-muted);
}
.status::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--signal); }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  display: inline-block; text-decoration: none; font-weight: 600; font-size: 0.98rem;
  padding: 11px 18px; border-radius: 4px; border: 1px solid transparent;
}
.btn-primary { background: var(--signal); color: #03111A !important; }
.btn-ghost { border-color: rgba(242,246,248,.4); color: var(--on-deep) !important; }
.btn-ghost:hover { border-color: var(--on-deep); }

/* Film */
.film { aspect-ratio: 16 / 9; max-width: 100%; width: 100%; background: #000; border-radius: 6px; overflow: hidden; position: relative; display: grid; place-items: center; }
.film iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }
.film .ph { margin: 16px; }
.caveat { font: 400 0.82rem/1.4 var(--mono); color: var(--on-deep-muted); }

/* Grids */
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 36px; align-items: start; }
.split { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 48px; align-items: center; }
.trait { display: grid; gap: 8px; align-content: start; padding-top: 16px; border-top: 2px solid var(--accent); }
.deep .trait { border-top-color: var(--signal); }
.trait p { color: var(--muted); }
.deep .trait p { color: var(--on-deep-muted); }

.case {
  display: grid; gap: 10px; align-content: start; text-decoration: none; color: inherit;
  background: var(--bg); border: 1px solid var(--line); border-radius: 6px; padding: 22px;
}
a.case:hover { border-color: var(--accent); }
.case .more { color: var(--accent); font-weight: 600; font-size: 0.95rem; }
.case p { color: var(--muted); }

/* Use-case detail rows */
.usecase { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 40px; align-items: start; scroll-margin-top: 24px; }
.usecase dl { display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: 8px 18px; margin: 0; }
.usecase dt { font: 500 0.78rem/1.9 var(--mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); }
.usecase dd { margin: 0; }
.tag { font: 500 0.72rem/1 var(--mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--accent); }

/* Sequence (a real order) */
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 0; counter-reset: s; }
.steps li { counter-increment: s; display: grid; grid-template-columns: 3rem minmax(0, 1fr); gap: 12px; padding-block: 14px; border-top: 1px solid var(--line); }
.steps li::before { content: counter(s, decimal-leading-zero); font: 500 0.95rem/1.6 var(--mono); color: var(--accent); }
.steps strong { display: block; }
.steps span { color: var(--muted); }

.loop video { width: 100%; height: auto; display: block; aspect-ratio: 16 / 9; background: #03111A; border-radius: 6px; }
.diagram { overflow-x: auto; }
.diagram svg { min-width: 560px; width: 100%; height: auto; display: block; }
.diagram text { font-family: var(--mono); font-size: 13px; fill: var(--ink); }
.diagram .soft { fill: var(--muted); }

figure { margin: 0; display: grid; gap: 8px; }
figcaption { font-size: 0.86rem; color: var(--muted); }
.deep figcaption { color: var(--on-deep-muted); }
.photo { border-radius: 6px; overflow: hidden; border: 1px solid var(--line); }

.facts { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.facts li { padding-left: 18px; position: relative; max-width: var(--measure); }
.facts li::before { content: ""; position: absolute; left: 0; top: 0.7em; width: 7px; height: 7px; background: var(--accent); }

.cv { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; }
.cv h3 { font-size: 1.05rem; margin-bottom: 8px; }
.cv ul { margin: 0; padding-left: 1.1em; display: grid; gap: 6px; color: var(--muted); }

.contact-box { display: grid; gap: 14px; }
.email { font: 500 1.15rem/1.3 var(--mono); user-select: all; word-break: break-all; }

.sources { font-size: 0.86rem; color: var(--muted); display: grid; gap: 6px; padding-left: 1.4em; margin: 0; }
.sources li { max-width: none; }

/* Review placeholders: delete before launch */
.ph {
  border: 1.5px dashed #C08A00; background: rgba(233,210,58,.12); color: inherit;
  font: 500 0.85rem/1.45 var(--mono); padding: 10px 12px; border-radius: 4px; max-width: var(--measure);
}

.site-foot { background: var(--abyss); color: var(--on-deep-muted); font-size: 0.88rem; }
.site-foot .wrap { padding-block: 28px; display: flex; flex-wrap: wrap; gap: 10px 28px; justify-content: space-between; }
.site-foot a { color: var(--on-deep-muted); }

@media (max-width: 860px) {
  .hero .wrap, .split, .grid-2, .usecase { grid-template-columns: minmax(0, 1fr); }
  .grid-3, .cv { grid-template-columns: minmax(0, 1fr); }
  .hero-media img { width: min(70%, 300px); }
}

/* Inline citations: small, unobtrusive */
.cite { font: 500 0.7em/0 var(--mono); margin-left: 1px; }
.cite a { text-decoration: none; padding: 0 1px; }
.sources li { scroll-margin-top: 24px; }
figcaption .credit { display: block; font-size: 0.78rem; margin-top: 2px; }
sup.tm { font-size: 0.85em; vertical-align: baseline; line-height: 0; margin-left: 0.03em; font-weight: 400; }
h1 sup.tm, h2 sup.tm { font-size: 0.45em; vertical-align: super; }