/* AeroSource — site.css
   Palette derives from briefing-room material: cool grey-green paper stock,
   slate ink, and one annotation red for the instructor's pen. Red is used
   only as a mark, never as a fill. */

:root {
  --paper:  #E9EBE6;
  --card:   #F5F6F3;
  --ink:    #14171A;
  --slate:  #4A555C;
  --rule:   #C4C9C2;
  --mark:   #B02A1F;

  --display: 'Archivo', 'Helvetica Neue', Arial, sans-serif;
  --body:    'Public Sans', system-ui, -apple-system, sans-serif;
  --mono:    'IBM Plex Mono', ui-monospace, 'SF Mono', Menlo, monospace;

  --logo-h: 76px;
  --logo-h-compact: 44px;
  --shell: 1120px;
  --gap: clamp(3.5rem, 8vw, 7rem);
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 17px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 5vw, 2.5rem);
}

.skip {
  position: absolute;
  left: -9999px;
  background: var(--ink);
  color: var(--paper);
  padding: 0.75rem 1rem;
  z-index: 50;
}
.skip:focus { left: 1rem; top: 1rem; }

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

/* ---------- masthead ---------- */

.masthead {
  border-bottom: 1px solid var(--rule);
  position: sticky;
  top: 0;
  background: var(--paper);
  z-index: 20;
}

.masthead__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: calc(var(--logo-h) + 30px);
  transition: min-height 0.22s ease;
  flex-wrap: wrap;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  text-decoration: none;
}
.wordmark__logo {
  display: block;
  height: var(--logo-h);
  width: auto;
  transition: height 0.22s ease;
}

/* Sticky masthead: full size on landing, compact once scrolling starts, so a
   large mark does not eat the viewport on every page of reading. */
.masthead.is-compact { min-height: calc(var(--logo-h-compact) + 26px); }
.masthead.is-compact .wordmark__logo { height: var(--logo-h-compact); }

.nav {
  display: flex;
  gap: clamp(0.85rem, 1.9vw, 1.6rem);
  align-items: center;
  flex-wrap: wrap;
}

.nav__link {
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--slate);
  padding-block: 0.35rem;
  border-bottom: 2px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.nav__link:hover { color: var(--ink); border-bottom-color: var(--rule); }
.nav__link.is-current { color: var(--ink); border-bottom-color: var(--mark); }

.navtoggle {
  display: none;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  background: none;
  border: 1px solid var(--rule);
  color: var(--ink);
  padding: 0.4rem 0.75rem;
  cursor: pointer;
}

/* ---------- shared type ---------- */

.eyebrow {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--slate);
  margin: 0 0 1.1rem;
}
.eyebrow::before {
  content: '';
  display: inline-block;
  width: 22px;
  height: 1px;
  background: var(--mark);
  vertical-align: 0.32em;
  margin-right: 0.6rem;
}

.h1 {
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(2.25rem, 5.4vw, 3.85rem);
  line-height: 1.04;
  letter-spacing: -0.035em;
  margin: 0 0 1.25rem;
  max-width: 16ch;
}

.h2 {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(1.6rem, 3.2vw, 2.3rem);
  line-height: 1.14;
  letter-spacing: -0.025em;
  margin: 0 0 1.5rem;
  max-width: 22ch;
}

.h3 {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.16rem;
  letter-spacing: -0.012em;
  margin: 0 0 0.6rem;
}

.lede {
  font-size: clamp(1.05rem, 1.7vw, 1.22rem);
  color: var(--slate);
  max-width: 54ch;
  margin: 0 0 2rem;
}

.p { max-width: 62ch; margin: 0 0 1.15rem; }

/* ---------- sections ---------- */

.section { padding-block: var(--gap); }
.section + .section { border-top: 1px solid var(--rule); }

/* ---------- buttons ---------- */

.actions { display: flex; flex-wrap: wrap; gap: 0.85rem; }

.btn {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 0.85rem 1.35rem;
  border: 1px solid var(--ink);
  color: var(--ink);
  background: transparent;
  transition: background 0.15s ease, color 0.15s ease;
}
.btn:hover { background: var(--ink); color: var(--paper); }
.btn--primary { background: var(--ink); color: var(--paper); }
.btn--primary:hover { background: var(--mark); border-color: var(--mark); color: var(--paper); }

/* ---------- hero ---------- */

.hero { padding-block: clamp(3.5rem, 8vw, 6.5rem) var(--gap); }

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: clamp(2.5rem, 5vw, 4.5rem);
  align-items: start;
}

/* ---------- signature: the script block ---------- */

.script {
  margin: 0;
  background: var(--card);
  border: 1px solid var(--rule);
  box-shadow: 6px 6px 0 rgba(20, 23, 26, 0.06);
}

.script__bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  justify-content: space-between;
  padding: 0.7rem 1.1rem;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.script__row {
  display: grid;
  grid-template-columns: 8.5rem minmax(0, 1fr);
  gap: 0.35rem 1rem;
  padding: 0.72rem 1.1rem;
  border-top: 1px solid var(--rule);
  position: relative;
}
.script__row:first-child { border-top: 0; }

.script__k {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--slate);
  padding-top: 0.18rem;
}

.script__v {
  font-family: var(--mono);
  font-size: 0.83rem;
  line-height: 1.5;
  color: var(--ink);
}

.script__row--mark::before {
  content: '';
  position: absolute;
  left: 0;
  top: -1px;
  bottom: 0;
  width: 3px;
  background: var(--mark);
}
.script__row--mark .script__v { color: var(--mark); }

.script__caption {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--slate);
  padding: 0.7rem 1.1rem;
  border-top: 1px solid var(--rule);
}

/* ---------- cards ---------- */

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}
.cards__item { background: var(--paper); padding: 1.9rem 1.6rem; }
.cards__body { margin: 0; color: var(--slate); font-size: 0.96rem; }

/* ---------- detail list ---------- */

.detail__item { padding-block: 2.6rem; border-top: 1px solid var(--rule); }
.detail__item:first-child { border-top: 0; padding-top: 0; }
.detail__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: start;
}
.detail__points { list-style: none; margin: 0; padding: 0; }
.detail__points li {
  position: relative;
  padding-left: 1.4rem;
  margin-bottom: 0.7rem;
  font-size: 0.95rem;
  color: var(--slate);
}
.detail__points li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.66em;
  width: 8px;
  height: 1px;
  background: var(--mark);
}

.detail__pointslabel {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--slate);
  margin: 0 0 1rem;
  padding-bottom: 0.8rem;
  border-bottom: 1px solid var(--rule);
}

/* ---------- products ---------- */

.product {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: start;
  padding-block: 2.6rem;
  border-top: 1px solid var(--rule);
}
.product:first-child { border-top: 0; padding-top: 0; }

.product__kind {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--slate);
  margin: 0 0 0.6rem;
}

.product__action { margin-top: 1.5rem; }

.product__specs {
  list-style: none;
  margin: 0;
  padding: 0;
  background: var(--card);
  border: 1px solid var(--rule);
}

.product__spec {
  display: grid;
  grid-template-columns: 6.5rem minmax(0, 1fr);
  gap: 0.3rem 1rem;
  padding: 0.75rem 1.1rem;
  border-top: 1px solid var(--rule);
}
.product__spec:first-child { border-top: 0; }

.product__sk {
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--slate);
  padding-top: 0.2rem;
}

.product__sv { font-family: var(--mono); font-size: 0.82rem; color: var(--ink); }

/* ---------- spotlight (one service given prominence) ---------- */

.spotlight {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: clamp(2rem, 4vw, 3.5rem);
  background: var(--card);
  border: 1px solid var(--rule);
  border-top: 3px solid var(--mark);
  padding: clamp(2rem, 4vw, 3rem);
}

.spotlight .h2 { margin-bottom: 1.1rem; }
.spotlight .p { margin-bottom: 1.75rem; }

.spotlight__points { list-style: none; margin: 0; padding: 0; }

.spotlight__point {
  display: grid;
  grid-template-columns: 7.5rem minmax(0, 1fr);
  gap: 0.3rem 1rem;
  padding: 0.8rem 0;
  border-top: 1px solid var(--rule);
}
.spotlight__point:first-child { border-top: 0; padding-top: 0; }

.spotlight__pk {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--mark);
  padding-top: 0.2rem;
}

.spotlight__pv { font-size: 0.95rem; color: var(--slate); }

/* ---------- image plates ----------
   Photography is treated as documentary evidence, not decoration. Every plate
   is desaturated to sit inside the grey-green palette, so the annotation red
   stays the only chromatic thing on the site and a mixed set of stock sources
   reads as one deliberate body of images. */

.plate { margin: 0; border: 1px solid var(--rule); background: var(--card); }

.plate img {
  display: block;
  width: 100%;
  height: auto;
  filter: grayscale(1) contrast(1.06) brightness(1.02);
}

.plate__caption {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--slate);
  padding: 0.8rem 1.1rem;
  border-top: 1px solid var(--rule);
}

/* ---------- papers register ---------- */

.papers { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--rule); }

.papers__item {
  display: grid;
  grid-template-columns: 6rem minmax(0, 1fr) 9rem;
  gap: 0.5rem 1.5rem;
  align-items: start;
  padding-block: 1.9rem;
  border-bottom: 1px solid var(--rule);
}

.papers__date {
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--slate);
  margin: 0;
  padding-top: 0.28rem;
}

.papers__topic {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--slate);
  margin: 0 0 0.45rem;
}

.papers__title {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.16rem;
  letter-spacing: -0.015em;
  margin: 0 0 0.5rem;
}

.papers__abstract { margin: 0; color: var(--slate); font-size: 0.96rem; max-width: 56ch; }

.papers__meta { margin: 0; padding-top: 0.3rem; }

.papers__get {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  text-decoration: none;
  border-bottom: 1px solid var(--mark);
  padding-bottom: 0.15rem;
  white-space: nowrap;
}
.papers__get:hover { color: var(--mark); }
.papers__get--gated { border-bottom-color: var(--rule); color: var(--slate); }
.papers__get--gated:hover { color: var(--ink); border-bottom-color: var(--mark); }

/* ---------- principles (open columns — deliberately not the card grid) ---------- */

.principles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: clamp(2rem, 4vw, 3.25rem);
}

.principles__item { border-top: 2px solid var(--mark); padding-top: 1.15rem; }
.principles__body { margin: 0; color: var(--slate); font-size: 0.98rem; }

/* ---------- fleet strip ---------- */

.fleet {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(96px, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
  list-style: none;
  margin: 0;
  padding: 0;
}

.fleet__type {
  background: var(--card);
  padding: 1.3rem 0.75rem;
  text-align: center;
  font-family: var(--mono);
  font-size: 1.02rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--ink);
  white-space: nowrap;
}

.fleet__note {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.05em;
  color: var(--slate);
  margin: 1rem 0 0;
}

/* ---------- steps (ordered — the number carries meaning here) ---------- */

.steps { counter-reset: step; margin: 0; padding: 0; list-style: none; }
.steps__item {
  counter-increment: step;
  display: grid;
  grid-template-columns: 4.5rem minmax(0, 1fr);
  gap: 1.25rem;
  padding-block: 1.9rem;
  border-top: 1px solid var(--rule);
}
.steps__item:first-child { border-top: 0; }
.steps__item::before {
  content: counter(step, decimal-leading-zero);
  font-family: var(--mono);
  font-size: 0.95rem;
  color: var(--mark);
  padding-top: 0.18rem;
}
.steps__body { margin: 0; color: var(--slate); max-width: 58ch; }

/* ---------- bios ---------- */

.bios { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 2.5rem; }
.bios__role {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--slate);
  margin: 0 0 0.9rem;
}
.bios__body { margin: 0; color: var(--slate); font-size: 0.98rem; }

/* ---------- contact ---------- */

.contact__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 2.5rem;
  border-top: 1px solid var(--rule);
  padding-top: 2.5rem;
}
.contact__label {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--slate);
  margin: 0 0 0.5rem;
}
.contact__value {
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.18rem;
  letter-spacing: -0.015em;
  margin: 0;
  word-break: break-word;
}
.contact__value a { text-decoration: none; border-bottom: 2px solid var(--mark); }

/* ---------- cta ---------- */

.cta__inner {
  background: var(--ink);
  color: var(--paper);
  padding: clamp(2.25rem, 5vw, 3.5rem);
}
.cta__inner .h2 { margin-bottom: 0.85rem; }
.cta__body { color: #B9C0C4; max-width: 48ch; margin: 0 0 1.9rem; }
.cta__inner .btn { border-color: var(--paper); color: var(--paper); }
.cta__inner .btn:hover { background: var(--paper); color: var(--ink); }
.cta__inner .btn--primary { background: var(--mark); border-color: var(--mark); }
.cta__inner .btn--primary:hover { background: var(--paper); color: var(--ink); border-color: var(--paper); }

/* ---------- footer ---------- */

.foot { border-top: 1px solid var(--rule); padding-block: 2.75rem; margin-top: var(--gap); }
.foot__inner { display: flex; flex-wrap: wrap; gap: 1.5rem 3rem; align-items: baseline; }
.foot__logo { display: block; height: 34px; width: auto; margin-bottom: 0.9rem; }
.foot__name { font-family: var(--display); font-weight: 700; margin: 0; }
.foot__meta, .foot__legal {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--slate);
  margin: 0.3rem 0 0;
}
.foot__legal { margin-left: auto; }
.foot__mail {
  font-family: var(--mono);
  font-size: 0.82rem;
  text-decoration: none;
  border-bottom: 1px solid var(--mark);
  display: inline-block;
  margin-right: 1.5rem;
}
.foot__mail:last-child { margin-right: 0; }

/* ---------- motion ---------- */

.reveal { opacity: 0; transform: translateY(10px); }
.is-revealed .reveal {
  animation: rise 0.5s cubic-bezier(0.22, 1, 0.36, 1) forwards;
}
@keyframes rise { to { opacity: 1; transform: none; } }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; animation: none !important; }
  * { transition-duration: 0.01ms !important; }
}

/* ---------- responsive ---------- */

@media (max-width: 860px) {
  .hero__grid, .detail__grid, .spotlight, .product { grid-template-columns: minmax(0, 1fr); }
  .h1 { max-width: 20ch; }
}

@media (max-width: 720px) {
  :root { --logo-h: 44px; --logo-h-compact: 34px; }
  .navtoggle { display: block; }
  .nav {
    display: none;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
    width: 100%;
    padding-block: 0.75rem 1.25rem;
  }
  .nav.is-open { display: flex; }
  .script__row { grid-template-columns: minmax(0, 1fr); }
  .steps__item { grid-template-columns: 2.75rem minmax(0, 1fr); gap: 0.9rem; }
  .papers__item { grid-template-columns: minmax(0, 1fr); gap: 0.75rem; }
  .spotlight__point { grid-template-columns: minmax(0, 1fr); gap: 0.2rem; }
  .product__spec { grid-template-columns: minmax(0, 1fr); gap: 0.2rem; }
  .foot__legal { margin-left: 0; width: 100%; }
}