/* ============================================================================
   aerotier.com — site stylesheet

   Extends the design language established by the 2026-08-06 landing page:
   drafting paper, drawing ink, one copper accent for "the conductor", IBM Plex,
   and an engineering title block as the footer. Everything added here is that
   same drawing metaphor carried further — numbered notes, spec tables, corner
   tick marks — rather than a second visual system bolted alongside it.

   Tokens are unchanged from the landing page on purpose. If they move, they
   move here and nowhere else.
   ========================================================================= */

:root {
  --paper:     #EDF0F3;   /* drafting paper */
  --ink:       #16233F;   /* drawing ink navy */
  --ink-soft:  #45536E;
  --ink-faint: #74809A;
  --line:      #C6CDD6;   /* faint grid rule */
  --rule:      #AEB7C4;   /* a drawn rule, heavier than the grid */
  --copper:    #A6642A;   /* the conductor */
  --copper-lt: #C98341;
  --white:     #FBFCFD;

  --grid: 48px;
  --wrap: 74rem;
  --logo-h: 44px;

  --mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  --cond: 'IBM Plex Sans Condensed', 'IBM Plex Sans', system-ui, sans-serif;
  --sans: 'IBM Plex Sans', system-ui, -apple-system, sans-serif;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  /* the drafting grid, exactly as the landing page draws it */
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: var(--grid) var(--grid);
  background-position: -1px -1px;
  background-attachment: fixed;
}

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 2rem; }

.skip {
  position: absolute; left: -9999px;
  background: var(--ink); color: var(--white);
  padding: 0.7rem 1.1rem; z-index: 100;
  font-family: var(--mono); font-size: 0.8rem;
}
.skip:focus { left: 1rem; top: 1rem; }

/* ── type ─────────────────────────────────────────────────────────────── */

h1, h2, h3, h4 {
  font-family: var(--cond);
  font-weight: 600;
  line-height: 1.14;
  letter-spacing: 0.02em;
}
h1 { font-size: clamp(2rem, 5vw, 3.15rem); text-transform: uppercase; letter-spacing: 0.035em; }
h2 { font-size: clamp(1.5rem, 3.2vw, 2.1rem); text-transform: uppercase; letter-spacing: 0.05em; }
h3 { font-size: 1.16rem; letter-spacing: 0.03em; }
h4 { font-size: 0.95rem; }

p { max-width: 68ch; }
p + p { margin-top: 1rem; }

a { color: var(--ink); }

.mono {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  text-transform: uppercase;
}

.lede {
  font-size: clamp(1.05rem, 2.1vw, 1.22rem);
  line-height: 1.6;
  color: var(--ink-soft);
  max-width: 60ch;
}

.eyebrow {
  display: inline-block;
  border: 1px solid var(--ink);
  padding: 0.35rem 0.9rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  background: var(--white);
}

/* Copper divider, as used in the landing page subhead */
.div { color: var(--copper); padding: 0 0.35rem; }

/* ── header ───────────────────────────────────────────────────────────── */

.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(237, 240, 243, 0.93);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}
.bar {
  display: flex; align-items: center; gap: 2rem;
  padding-top: 0.95rem; padding-bottom: 0.95rem;
}
.brand { display: flex; align-items: center; gap: 0.7rem; text-decoration: none; margin-right: auto; }
.brand img { height: 44px; width: auto; display: block; }

/* The landing page shipped this fallback as an EMPTY span, so a failed logo
   request left the page with no company name at all. It is real text here. */
.wordmark {
  font-family: var(--cond);
  font-weight: 700;
  font-size: 1.3rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink);
}
.wordmark .tld { color: var(--copper); }
.brand img + .wordmark { display: none; }   /* logo wins when it loads */

.nav { display: flex; gap: 1.6rem; }
.nav a {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink-soft);
  padding: 0.3rem 0;
  border-bottom: 1.5px solid transparent;
}
.nav a:hover { color: var(--ink); border-bottom-color: var(--line); }
.nav a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--copper); }

.btn {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-decoration: none;
  background: var(--ink);
  color: var(--white);
  padding: 0.68rem 1.15rem;
  border: 1.5px solid var(--ink);
  transition: background 0.15s ease, color 0.15s ease;
}
.btn:hover { background: var(--copper); border-color: var(--copper); }
.btn.ghost { background: transparent; color: var(--ink); }
.btn.ghost:hover { background: var(--ink); color: var(--white); border-color: var(--ink); }
.btn.on-ink { background: var(--copper); border-color: var(--copper); color: var(--white); }
.btn.on-ink:hover { background: var(--copper-lt); border-color: var(--copper-lt); }
.btn.ghost.on-ink { background: transparent; color: var(--white); border-color: rgba(251,252,253,0.45); }
.btn.ghost.on-ink:hover { background: var(--white); color: var(--ink); border-color: var(--white); }

.navtoggle {
  display: none;
  background: none; border: 1px solid var(--rule);
  width: 40px; height: 36px; cursor: pointer;
  flex-direction: column; justify-content: center; align-items: center; gap: 4px;
}
.navtoggle span { display: block; width: 18px; height: 1.5px; background: var(--ink); }

:focus-visible { outline: 2px solid var(--copper); outline-offset: 3px; }

/* ── sections ─────────────────────────────────────────────────────────── */

section { padding: 4.5rem 0; border-bottom: 1px solid var(--line); }
section.tight { padding: 3rem 0; }
section.ink {
  background: var(--ink);
  color: var(--white);
  border-bottom: none;
}
section.ink h2, section.ink h3, section.ink .wordmark { color: var(--white); }
section.ink p, section.ink .lede { color: #C3CCDC; }
section.ink .note { border-color: rgba(251,252,253,0.25); background: rgba(251,252,253,0.05); }

/* A section header drawn like a drawing note: 1.0 CAPABILITIES ─────────── */
.snote { display: flex; align-items: baseline; gap: 0.85rem; margin-bottom: 1.4rem; }
.snote .num {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--copper);
  flex: none;
}
.snote::after {
  content: ""; flex: 1; height: 1px; background: var(--line);
  align-self: center;
}
section.ink .snote::after { background: rgba(251,252,253,0.2); }

/* ── hero ─────────────────────────────────────────────────────────────── */

.hero { padding: 5rem 0 4.5rem; text-align: center; border-bottom: 1px solid var(--line); }
.hero .stage { max-width: 52rem; margin: 0 auto; }
.hero h1 { margin: 1.4rem 0 1.25rem; }
.hero .lede { margin: 0 auto 2.25rem; }
.hero .cta { display: flex; gap: 0.8rem; justify-content: center; flex-wrap: wrap; }

/* Harness branch motif — trunk breaking out to terminals. From the landing page. */
.harness { width: min(420px, 80vw); height: auto; margin: 0 auto 2rem; display: block; }
.harness path, .harness line { stroke: var(--ink); stroke-width: 1.5; fill: none; }
.harness .node { fill: var(--copper); stroke: none; }
.harness .draw { stroke-dasharray: 600; stroke-dashoffset: 600; animation: draw 1.6s ease forwards; }
@keyframes draw { to { stroke-dashoffset: 0; } }

.reveal { opacity: 0; transform: translateY(10px); animation: rise 0.7s ease forwards; }
.reveal.d1 { animation-delay: 0.20s; }
.reveal.d2 { animation-delay: 0.38s; }
.reveal.d3 { animation-delay: 0.56s; }
.reveal.d4 { animation-delay: 0.74s; }
@keyframes rise { to { opacity: 1; transform: translateY(0); } }

@media (prefers-reduced-motion: reduce) {
  .harness .draw { animation: none; stroke-dashoffset: 0; }
  .reveal { animation: none; opacity: 1; transform: none; }
}

/* ── cards, drawn with corner tick marks ──────────────────────────────── */

.grid { display: grid; gap: 1.25rem; }
.grid.c2 { grid-template-columns: repeat(2, 1fr); }
.grid.c3 { grid-template-columns: repeat(3, 1fr); }
.grid.c4 { grid-template-columns: repeat(4, 1fr); }

.card {
  position: relative;
  background: var(--white);
  border: 1px solid var(--rule);
  padding: 1.6rem 1.5rem;
}
.card h3 { margin-bottom: 0.6rem; }
.card p { color: var(--ink-soft); font-size: 0.96rem; }
.card .kicker {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--copper);
  display: block;
  margin-bottom: 0.5rem;
}
/* corner ticks — the registration marks on a drawing sheet */
.card::before, .card::after {
  content: ""; position: absolute; width: 9px; height: 9px; pointer-events: none;
}
.card::before { top: -1px; left: -1px; border-top: 2px solid var(--copper); border-left: 2px solid var(--copper); }
.card::after  { bottom: -1px; right: -1px; border-bottom: 2px solid var(--copper); border-right: 2px solid var(--copper); }

section.ink .card { background: rgba(251,252,253,0.055); border-color: rgba(251,252,253,0.2); }
section.ink .card p { color: #C3CCDC; }

/* ── spec table — the parts list on a drawing ─────────────────────────── */

.spec { width: 100%; border-collapse: collapse; background: var(--white); border: 1px solid var(--rule); }
.spec caption {
  text-align: left;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-soft);
  padding-bottom: 0.55rem;
}
.spec th, .spec td { text-align: left; padding: 0.72rem 1rem; border-bottom: 1px solid var(--line); vertical-align: top; }
.spec thead th {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-soft);
  font-weight: 500;
  background: #E4E8ED;
}
.spec tbody th { font-family: var(--cond); font-weight: 600; font-size: 0.98rem; width: 34%; }
.spec td { color: var(--ink-soft); font-size: 0.95rem; }
.spec tr:last-child th, .spec tr:last-child td { border-bottom: none; }
.spec .m { font-family: var(--mono); font-size: 0.82rem; letter-spacing: 0.04em; color: var(--ink); }
.tablewrap { overflow-x: auto; }

/* ── numbered list, drawn as drawing notes ────────────────────────────── */

.notes { list-style: none; counter-reset: n; display: grid; gap: 1.1rem; }
.notes li { counter-increment: n; display: flex; gap: 1rem; align-items: flex-start; }
.notes li::before {
  content: counter(n) ".0";
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--copper);
  flex: none;
  padding-top: 0.22rem;
  min-width: 2.4rem;
}
.notes strong { font-family: var(--cond); font-size: 1.05rem; letter-spacing: 0.02em; display: block; }
.notes p { color: var(--ink-soft); font-size: 0.96rem; margin-top: 0.15rem; }

/* plain bullet list */
.ticks { list-style: none; display: grid; gap: 0.5rem; }
.ticks li { position: relative; padding-left: 1.4rem; color: var(--ink-soft); font-size: 0.96rem; }
.ticks li::before {
  content: ""; position: absolute; left: 0; top: 0.62em;
  width: 8px; height: 8px; border-left: 1.5px solid var(--copper); border-bottom: 1.5px solid var(--copper);
  transform: rotate(-45deg) translateY(-2px);
}
section.ink .ticks li { color: #C3CCDC; }

/* ── note / callout — a boxed general note on a drawing ───────────────── */

.note {
  border: 1px solid var(--rule);
  border-left: 3px solid var(--copper);
  background: var(--white);
  padding: 1.25rem 1.4rem;
}
.note .label {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--copper);
  display: block;
  margin-bottom: 0.45rem;
}
.note p { color: var(--ink-soft); font-size: 0.97rem; }

/* ── status ledger — where the company actually is ────────────────────── */

.ledger { border: 1px solid var(--rule); background: var(--white); }
.ledger .row {
  display: grid; grid-template-columns: 12rem 1fr auto;
  gap: 1rem; align-items: baseline;
  padding: 0.85rem 1.2rem; border-bottom: 1px solid var(--line);
}
.ledger .row:last-child { border-bottom: none; }
.ledger .k { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-soft); }
.ledger .v { font-size: 0.96rem; color: var(--ink); }
.ledger .s {
  font-family: var(--mono); font-size: 0.64rem; letter-spacing: 0.14em; text-transform: uppercase;
  padding: 0.2rem 0.6rem; border: 1px solid currentColor; white-space: nowrap;
}
.ledger .s.done    { color: #2C6E49; }
.ledger .s.now     { color: var(--copper); }
.ledger .s.planned { color: var(--ink-faint); }

/* No form styles here on purpose — the contact sheet uses a mailto, not a web
   form. See the comment at the top of pages/contact.html for why. If a form is
   ever added, its backend and the mailbox behind it come first. */

/* ── footer ───────────────────────────────────────────────────────────── */

footer { background: var(--ink); color: #C3CCDC; }
footer .wrap { padding-top: 3rem; padding-bottom: 2.5rem; }
.fgrid { display: grid; grid-template-columns: 2.2fr 1fr 1fr 1fr; gap: 2rem; }
.fbrand p { font-size: 0.92rem; color: #98A5BC; margin-top: 0.7rem; max-width: 30ch; }
.fbrand .wordmark { color: var(--white); }
.fcol h4 {
  font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--copper-lt); margin-bottom: 0.8rem; font-weight: 500;
}
.fcol a { display: block; color: #C3CCDC; text-decoration: none; font-size: 0.93rem; padding: 0.22rem 0; }
.fcol a:hover { color: var(--white); }

/* Title block — the drawing convention carried from the landing page. */
.titleblock {
  display: grid;
  grid-template-columns: 2.2fr 1.2fr 0.6fr 1fr 0.8fr;
  max-width: var(--wrap);
  margin: 0 auto;
  border-top: 1.5px solid rgba(251,252,253,0.35);
}
.tb-cell { border-right: 1px solid rgba(251,252,253,0.18); padding: 0.6rem 0.9rem 0.7rem; }
.tb-cell:last-child { border-right: none; }
.tb-label {
  font-family: var(--mono); font-size: 0.58rem; letter-spacing: 0.18em;
  text-transform: uppercase; color: #8E9BB3; display: block; margin-bottom: 0.15rem;
}
.tb-value {
  font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.05em;
  color: var(--white); white-space: nowrap;
}
.legal {
  text-align: center; font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.1em;
  color: #8E9BB3; padding: 0.6rem 1rem 0.9rem; border-top: 1px solid rgba(251,252,253,0.18);
}
.legal a.parent-link {
  color: #8E9BB3; text-decoration: none;
  border-bottom: 1px solid var(--copper); padding-bottom: 1px;
}
.legal a.parent-link:hover { color: var(--white); }

/* ── prose pages (privacy, terms) ─────────────────────────────────────── */

.prose { max-width: 46rem; }
.prose h2 { margin: 2.4rem 0 0.9rem; font-size: 1.3rem; }
.prose h2:first-child { margin-top: 0; }
.prose p, .prose li { color: var(--ink-soft); font-size: 0.98rem; }
.prose ul { margin: 0.6rem 0 0 1.2rem; display: grid; gap: 0.35rem; }

/* ── responsive ───────────────────────────────────────────────────────── */

@media (max-width: 900px) {
  .grid.c4 { grid-template-columns: repeat(2, 1fr); }
  .grid.c3 { grid-template-columns: repeat(2, 1fr); }
  .fgrid { grid-template-columns: 1fr 1fr; gap: 1.6rem; }
}

@media (max-width: 760px) {
  .wrap { padding: 0 1.25rem; }
  .navtoggle { display: flex; }
  .nav {
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; gap: 0;
    background: var(--paper); border-bottom: 1px solid var(--rule); padding: 0.5rem 1.25rem 1rem;
  }
  .nav.open { display: flex; }
  .nav a { padding: 0.7rem 0; border-bottom: 1px solid var(--line); }
  .bar .btn { margin-left: auto; }
  section { padding: 3.25rem 0; }
  .grid.c2, .grid.c3, .grid.c4 { grid-template-columns: 1fr; }
  .ledger .row { grid-template-columns: 1fr; gap: 0.3rem; }
  .ledger .s { justify-self: start; }
  .spec tbody th { width: auto; }
  .titleblock { grid-template-columns: 1fr 1fr; }
  .tb-cell { border-bottom: 1px solid rgba(251,252,253,0.18); }
  .tb-value { white-space: normal; }
  .fgrid { grid-template-columns: 1fr; }
}

@media (max-width: 420px) {
  .bar { gap: 0.75rem; }
  .bar .btn { font-size: 0.68rem; padding: 0.6rem 0.8rem; }
}