/* ==========================================================================
   AeroInsite — site styles
   Organised as: tokens, base, layout, components, sections, responsive.
   Colours are sampled from the approved horizontal logo. See ../README.md.
   ========================================================================== */

@font-face {
  font-family: Manrope;
  src: url('../assets/fonts/manrope.woff2') format('woff2');
  font-style: normal;
  font-weight: 200 800;
  font-display: swap;
}
@font-face {
  font-family: Inter;
  src: url('../assets/fonts/inter.woff2') format('woff2');
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
}

/* --------------------------------------------------------------- tokens -- */

:root {
  /* brand — measured from assets/logo/aeroinsite-horizontal.png */
  --navy: #0e304f;
  --navy-deep: #07203a;
  --teal: #15736f;
  --teal-light: #6ccfc6;
  --blue: #0b76a3;

  /* surfaces and text */
  --paper: #f4f7f8;
  --white: #ffffff;
  --ink: #0e304f;
  --muted: #4e6272;
  --line: #dde5ea;
  --on-dark: #b6cdd8;
  --dark-line: #24455f;

  --space: clamp(1.25rem, 5vw, 4.5rem);
  --content: 1220px;
  --radius: 4px;

  color-scheme: light;
  font-family: Inter, system-ui, -apple-system, 'Segoe UI', Arial, sans-serif;
  font-size: 100%;
  font-synthesis: none;
}

/* ----------------------------------------------------------------- base -- */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 6.5rem;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.65;
  overflow-wrap: break-word;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, p, figure, ul, ol, dl, dd, blockquote { margin: 0; }

h1, h2, h3, h4 {
  font-family: Manrope, Inter, Arial, sans-serif;
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.04em;
}
h1 { font-size: clamp(2.35rem, 5.2vw, 4.4rem); }
h2 { font-size: clamp(1.85rem, 3.4vw, 3rem); }
h3 { font-size: clamp(1.25rem, 1.9vw, 1.6rem); letter-spacing: -0.03em; }
h4 { font-size: 1.05rem; letter-spacing: -0.02em; }

p { max-width: 68ch; }

a { color: inherit; text-underline-offset: 0.22em; }

img, svg, video { display: block; max-width: 100%; }
img { height: auto; }

button, input, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: 0; }

ul, ol { padding: 0; list-style: none; }

::selection { background: var(--teal-light); color: var(--navy-deep); }

:focus-visible {
  outline: 3px solid var(--teal);
  outline-offset: 4px;
  border-radius: 2px;
}
.dark :focus-visible { outline-color: var(--teal-light); }

[hidden] { display: none !important; }

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  left: 1rem; top: -6rem;
  z-index: 300;
  background: var(--teal);
  color: #fff;
  padding: 0.85rem 1.2rem;
  text-decoration: none;
  transition: top 0.15s;
}
.skip-link:focus { top: 1rem; }

/* --------------------------------------------------------------- layout -- */

.wrap {
  width: min(calc(100% - var(--space) * 2), var(--content));
  margin-inline: auto;
}
.wrap--narrow { --content: 900px; }

.section { padding-block: clamp(3.75rem, 7.5vw, 7rem); }
.section--tight { padding-block: clamp(2.75rem, 5vw, 4.5rem); }

.dark {
  background: var(--navy);
  color: #eef4f7;
  --muted: var(--on-dark);
  --line: var(--dark-line);
}
.white { background: var(--white); }
.paper { background: var(--paper); }

.rule { height: 1px; background: var(--line); border: 0; margin: 0; }

/* ----------------------------------------------------------- components -- */

.eyebrow {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0 0 1.35rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  line-height: 1.5;
  color: var(--teal);
}
.eyebrow::before {
  content: '';
  flex: none;
  width: 1.75rem;
  height: 2px;
  background: currentColor;
}
.dark .eyebrow { color: var(--teal-light); }

.lead {
  font-size: clamp(1.08rem, 1.4vw, 1.28rem);
  line-height: 1.68;
  color: var(--muted);
}
.dark .lead { color: #cfe0e8; }

.small { font-size: 0.875rem; }
.muted { color: var(--muted); }

.stack > * + * { margin-top: 1.15rem; }
.stack > h2 + p { margin-top: 1.6rem; }

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 1.1rem;
  min-height: 3.1rem;
  padding: 0.8rem 1.35rem;
  border: 1px solid var(--teal);
  border-radius: var(--radius);
  background: var(--teal);
  color: #fff;
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.4;
  text-decoration: none;
  transition: background 0.2s, border-color 0.2s, transform 0.2s;
}
.button:hover { background: #0f5f5c; border-color: #0f5f5c; transform: translateY(-2px); }

.button--ghost {
  background: transparent;
  color: inherit;
  border-color: var(--line);
}
.button--ghost:hover { background: rgba(21, 115, 111, 0.09); border-color: var(--teal); }
.dark .button--ghost { border-color: #3d637f; }
.dark .button--ghost:hover { background: rgba(108, 207, 198, 0.12); border-color: var(--teal-light); }

.actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-top: 2.1rem;
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-size: 0.9rem;
  font-weight: 600;
  line-height: 1.5;
  text-decoration: none;
  color: var(--teal);
  padding-block: 0.3rem;
}
.dark .text-link { color: var(--teal-light); }
.text-link:hover { text-decoration: underline; }
.text-link .icon { transition: transform 0.2s; }
.text-link:hover .icon { transform: translate(3px, -3px); }

.icon {
  width: 1.05em;
  height: 1.05em;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.3rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: 40px;
  font-size: 0.75rem;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--muted);
}
.tag--stage {
  border-color: transparent;
  background: #e3efec;
  color: #14584f;
}
.dark .tag--stage { background: #15394c; color: var(--teal-light); }

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: 1.5rem clamp(2rem, 6vw, 5rem);
  align-items: end;
  margin-bottom: clamp(2.25rem, 4vw, 3.5rem);
}
.section-head h2 { max-width: 18ch; }
.section-head p { max-width: 46ch; }

.note {
  max-width: 68ch;
  padding-left: 1.1rem;
  border-left: 2px solid var(--teal);
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--muted);
}
.dark .note { border-left-color: var(--teal-light); }

/* --------------------------------------------------------------- header -- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 78px;
}

.brand { display: inline-flex; align-items: center; flex: none; }
.brand img { width: clamp(148px, 17vw, 196px); height: auto; }

.main-nav { display: flex; align-items: center; gap: clamp(1rem, 2.4vw, 2.1rem); }
.main-nav a {
  position: relative;
  font-size: 0.875rem;
  text-decoration: none;
  white-space: nowrap;
  padding-block: 0.8rem;
  color: var(--ink);
}
.main-nav a:hover { color: var(--teal); }
.main-nav a[aria-current='page']::after,
.main-nav a.is-current::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: 0.35rem;
  height: 2px;
  background: var(--teal);
}
.main-nav .button { color: #fff; }
.main-nav .button:hover { color: #fff; }

.menu-toggle {
  display: none;
  align-items: center;
  gap: 0.55rem;
  min-height: 44px;
  padding: 0.5rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 0.85rem;
  font-weight: 600;
}
.menu-toggle .icon { width: 1.2rem; height: 1.2rem; }
.menu-toggle .icon-close { display: none; }
.menu-toggle[aria-expanded='true'] .icon-open { display: none; }
.menu-toggle[aria-expanded='true'] .icon-close { display: block; }

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

.hero, .page-hero {
  /* dark surfaces that are not .dark: keep text tokens legible */
  --muted: #cfe0e8;
  --line: var(--dark-line);
}
.hero .eyebrow, .page-hero .eyebrow { color: var(--teal-light); }

.hero {
  position: relative;
  background: var(--navy);
  color: #eef4f7;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 90% at 82% 18%, rgba(21, 115, 111, 0.34), transparent 62%),
    linear-gradient(180deg, var(--navy) 0%, var(--navy-deep) 100%);
}
.hero > * { position: relative; }

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr);
  gap: clamp(2.5rem, 5vw, 4.5rem);
  align-items: center;
  padding-block: clamp(3.25rem, 6.5vw, 6rem);
}

.hero h1 { max-width: 13ch; letter-spacing: -0.05em; line-height: 1.04; }
.hero h1 em { font-style: normal; color: var(--teal-light); display: block; }
.hero .lead { max-width: 46ch; margin-top: 1.7rem; }

.hero-figure { min-width: 0; }
.hero-figure svg { width: 100%; height: auto; }

.hero-foot {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 2.25rem;
  padding-block: 1.15rem;
  border-top: 1px solid rgba(182, 205, 216, 0.22);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  color: #bed2dd;
}
.hero-foot > span { display: inline-flex; align-items: center; gap: 0.6rem; }
.hero-foot > span::before {
  content: '';
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--teal-light);
  flex: none;
}

/* --------------------------------------------------------- intro strip -- */

.strip { padding-block: 2.25rem; border-bottom: 1px solid var(--line); }
.strip .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem 3rem;
}
.strip p {
  font-family: Manrope, Inter, sans-serif;
  font-size: clamp(1.1rem, 1.7vw, 1.35rem);
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: -0.02em;
  max-width: 42ch;
}
.strip ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.6rem;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------------------------------------------------------- opportunity -- */

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(2.5rem, 5.5vw, 5rem);
  align-items: center;
}
.split--top { align-items: start; }
.split__copy p + p { margin-top: 1.15rem; }

.figure-card {
  min-width: 0;
  padding: clamp(1.4rem, 3vw, 2.4rem);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.figure-card svg { width: 100%; height: auto; }
.figure-card figcaption {
  margin-top: 1.4rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--muted);
}

/* --------------------------------------------------------- applications -- */

.apps { border-top: 1px solid var(--line); }

.app {
  display: grid;
  grid-template-columns: 3.5rem minmax(0, 1.15fr) minmax(0, 1.35fr);
  gap: 1.5rem clamp(1.5rem, 4vw, 3.5rem);
  padding-block: clamp(2.25rem, 4vw, 3.25rem);
  border-bottom: 1px solid var(--line);
  align-items: start;
}
.app__num {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--teal);
  padding-top: 0.45rem;
}
.app__art { margin-bottom: 1.1rem; }
.app__art svg { width: 100%; max-width: 180px; height: auto; }
.app h3 { margin-bottom: 0.8rem; }
.app__lede { font-size: 0.95rem; color: var(--muted); }
.app dl { display: grid; gap: 1.15rem; }
.app dt {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 0.35rem;
}
.app dd { margin: 0; font-size: 0.95rem; color: var(--muted); }
.app dd strong { color: var(--ink); font-weight: 500; }

/* ------------------------------------------------------------- approach -- */

.approach-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.12fr);
  gap: clamp(2rem, 4.5vw, 4rem);
  align-items: start;
}

.steps { display: grid; }
.step {
  display: grid;
  grid-template-columns: 2.6rem minmax(0, 1fr);
  gap: 1rem;
  width: 100%;
  text-align: left;
  padding: 1.6rem 0;
  border: 0;
  border-bottom: 1px solid var(--dark-line);
  color: #cfe0e8;
  transition: color 0.2s;
}
.steps > .step:first-child { border-top: 1px solid var(--dark-line); }
.step__num {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: #8fb0c2;
  padding-top: 0.3rem;
}
.step h3 {
  font-size: 1.15rem;
  margin-bottom: 0.4rem;
  color: #eef4f7;
  transition: color 0.2s;
}
.step p { font-size: 0.9rem; line-height: 1.65; }
.step:hover h3 { color: var(--teal-light); }

/* enhanced (JS) mode: one step open at a time */
.step__btn {
  display: block;
  width: 100%;
  padding: 0;
  font: inherit;
  color: inherit;
  text-align: left;
  letter-spacing: inherit;
}
.step__btn:focus-visible { outline-offset: 3px; }

.js-steps .step {
  border-left: 2px solid transparent;
  padding-left: 1rem;
  transition: border-color 0.2s;
}
.js-steps .step[aria-expanded='false'] h3 + p { display: none; }
.js-steps .step[aria-expanded='true'] { border-left-color: var(--teal-light); }
.js-steps .step[aria-expanded='true'] .step__num,
.js-steps .step[aria-expanded='true'] h3 { color: var(--teal-light); }

.schematic {
  position: sticky;
  top: 6.5rem;
  padding: clamp(1.25rem, 2.5vw, 2rem);
  border: 1px solid var(--dark-line);
  border-radius: var(--radius);
  background: rgba(7, 32, 58, 0.55);
}
.schematic svg { width: 100%; height: auto; }
.schematic__head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 1rem;
  margin-bottom: 1.25rem;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: #8fb0c2;
}
.schematic figcaption {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--dark-line);
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--on-dark);
  min-height: 3.2em;
}

/* schematic layers: all visible without JS, one-at-a-time with JS */
.js-steps .layer { opacity: 0.14; transition: opacity 0.35s; }
.js-steps .layer.is-on { opacity: 1; }

/* ----------------------------------------------------------------- plan -- */

.plan {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(1.5rem, 3vw, 2.5rem);
}
.plan li { border-top: 2px solid var(--teal); padding-top: 1.15rem; }
.plan h3 { font-size: 1.2rem; margin: 0.6rem 0 0.7rem; }
.plan p { font-size: 0.92rem; color: var(--muted); }
.plan .plan__num { font-size: 0.75rem; font-weight: 600; letter-spacing: 0.1em; color: var(--teal); }

/* ------------------------------------------------------------- invite --- */

.invite { position: relative; overflow: hidden; }
.invite__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: clamp(2.5rem, 5vw, 4.5rem);
  align-items: center;
}
.invite h2 { max-width: 16ch; }
.invite__card {
  --muted: #4e6272;
  padding: clamp(1.5rem, 3vw, 2.25rem);
  background: var(--white);
  border-radius: var(--radius);
  color: var(--ink);
}
.invite__card img { width: min(158px, 46%); height: auto; margin-bottom: 1.4rem; }
.invite__card p { font-size: 0.92rem; color: var(--muted); }
.invite__card .actions { margin-top: 1.6rem; }

.audience {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.25rem, 3vw, 2.5rem);
  margin-top: clamp(2.5rem, 5vw, 4rem);
  padding-top: clamp(2rem, 4vw, 3rem);
  border-top: 1px solid var(--dark-line);
}
.audience h3 { font-size: 1.1rem; margin-bottom: 0.6rem; color: var(--teal-light); }
.audience p { font-size: 0.92rem; color: var(--on-dark); }

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

.site-footer {
  background: var(--paper);
  border-top: 1px solid var(--line);
  padding-block: clamp(2.5rem, 5vw, 4rem) 1.5rem;
}
.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(2, minmax(0, 1fr));
  gap: 2.5rem;
  padding-bottom: 2.5rem;
}
.footer-top img { width: 190px; height: auto; margin-bottom: 1.25rem; }
.footer-top p { font-size: 0.9rem; color: var(--muted); max-width: 34ch; }
.footer-nav h2 {
  font-family: Inter, sans-serif;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.9rem;
}
.footer-nav li + li { margin-top: 0.6rem; }
.footer-nav a { font-size: 0.9rem; text-decoration: none; }
.footer-nav a:hover { color: var(--teal); text-decoration: underline; }
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  font-size: 0.78rem;
  color: var(--muted);
}

/* ---------------------------------------------------------- venture page -- */

.page-hero {
  background: var(--navy);
  color: #eef4f7;
  padding-block: clamp(3rem, 6vw, 5.5rem);
}
.page-hero h1 { max-width: 16ch; font-size: clamp(2.2rem, 4.6vw, 3.9rem); }
.page-hero .lead { max-width: 54ch; margin-top: 1.6rem; }

.prose h2 { margin-bottom: 1.35rem; max-width: 22ch; }
.prose h3 { margin: 2.25rem 0 0.75rem; }
.prose p + p { margin-top: 1.15rem; }
.prose p { color: var(--muted); }
.prose .lead-in { color: var(--ink); font-size: 1.1rem; }

.bullets { display: grid; gap: 1rem; margin-top: 1.5rem; }
.bullets li {
  display: grid;
  grid-template-columns: 1.1rem minmax(0, 1fr);
  gap: 0.85rem;
  font-size: 0.97rem;
  color: var(--muted);
}
.bullets li::before {
  content: '';
  width: 0.55rem; height: 0.55rem;
  margin-top: 0.62rem;
  border: 2px solid var(--teal);
  border-radius: 50%;
}
.bullets strong { color: var(--ink); font-weight: 600; }
.dark .bullets strong { color: #eef4f7; }
.dark .bullets li::before { border-color: var(--teal-light); }

.stage-head {
  font-size: 1.05rem;
  margin-bottom: 1.1rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--line);
}

.milestones { border-top: 1px solid var(--line); }
.milestone {
  display: grid;
  grid-template-columns: 3.5rem minmax(0, 1fr) minmax(0, 1.15fr);
  gap: 1rem clamp(1.5rem, 4vw, 3rem);
  padding-block: 1.9rem;
  border-bottom: 1px solid var(--line);
  align-items: start;
}
.milestone__num {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--teal);
  padding-top: 0.3rem;
}
.milestone h3 { font-size: 1.15rem; margin-bottom: 0.5rem; }
.milestone p { font-size: 0.93rem; color: var(--muted); }
.milestone__q {
  font-size: 0.93rem;
  color: var(--muted);
  padding-left: 1.1rem;
  border-left: 2px solid var(--line);
}
.milestone__q span {
  display: block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal);
  margin-bottom: 0.4rem;
}

.talk {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.5rem, 3vw, 2.5rem);
}
.talk article { padding: 1.75rem; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius); }
.talk h3 { font-size: 1.15rem; margin-bottom: 0.75rem; }
.talk p { font-size: 0.93rem; color: var(--muted); }

.chain {
  --chain-gap: clamp(1.25rem, 2.5vw, 2.25rem);
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: var(--chain-gap);
}
.chain li { position: relative; }
.chain li:not(:last-child)::after {
  content: '';
  position: absolute;
  left: 55px;
  right: calc(-1 * var(--chain-gap));
  top: 27px;
  height: 1px;
  background: var(--line);
}
.chain__glyph {
  position: relative;
  display: grid;
  place-items: center;
  width: 55px; height: 55px;
  margin-bottom: 1.15rem;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--white);
  color: var(--teal);
}
.chain__glyph .icon { width: 1.4rem; height: 1.4rem; }
.chain h3 { font-size: 1.02rem; margin-bottom: 0.5rem; }
.chain p { font-size: 0.88rem; color: var(--muted); }

@media (max-width: 1080px) {
  .chain { grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
  .chain li:not(:last-child)::after { display: none; }
}

.contact-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(2rem, 4vw, 3.5rem);
  align-items: start;
}
.contact-panel dl { margin-top: 1.5rem; display: grid; gap: 1.25rem; }
.contact-panel dt {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--teal-light);
  margin-bottom: 0.3rem;
}
.contact-panel dd { margin: 0; font-size: 0.95rem; color: var(--on-dark); }

/* ------------------------------------------------------------ 404 page --- */

.empty { padding-block: clamp(4rem, 12vw, 9rem); text-align: center; }
.empty h1 { max-width: 16ch; margin-inline: auto; }
.empty p { max-width: 44ch; margin: 1.4rem auto 0; }
.empty .actions { justify-content: center; }

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

@media (max-width: 1080px) {
  .hero-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .hero h1 { max-width: 16ch; }
  .approach-layout { grid-template-columns: 1fr; }
  .schematic { position: static; order: -1; }
  .plan { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .app { grid-template-columns: 2.75rem minmax(0, 1fr); }
  .app__art { grid-column: 2; }
  .app dl { grid-column: 2; }
}

@media (max-width: 860px) {
  /* Without JavaScript the nav simply stacks below the logo and the
     toggle stays hidden, so there is never a control that does nothing. */
  .header-inner { flex-wrap: wrap; }
  .main-nav {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    width: 100%;
    padding-bottom: 1rem;
  }

  .js .menu-toggle { display: inline-flex; }
  .js .main-nav {
    display: none;
    position: absolute;
    left: 0; right: 0; top: 100%;
    width: auto;
    padding: 0.5rem var(--space) 1.5rem;
    background: var(--white);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 18px 40px rgba(14, 48, 79, 0.1);
  }
  .js .main-nav.is-open { display: flex; }
  .main-nav a {
    padding: 0.95rem 0;
    border-bottom: 1px solid var(--line);
    font-size: 1rem;
  }
  .main-nav a[aria-current='page']::after,
  .main-nav a.is-current::after { bottom: auto; top: 0.95rem; right: auto; width: 1rem; }
  .main-nav .button { margin-top: 1rem; border-bottom: 0; }
  .site-header { position: sticky; }
  .header-inner { position: relative; }

  .split, .invite__grid, .contact-panel, .section-head { grid-template-columns: 1fr; }
  .section-head { align-items: start; }
  .audience, .talk { grid-template-columns: 1fr; }
  .milestone { grid-template-columns: 2.75rem minmax(0, 1fr); }
  .milestone__q { grid-column: 2; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .footer-top > :first-child { grid-column: 1 / -1; }
}

@media (max-width: 560px) {
  .plan { grid-template-columns: 1fr; }
  .app { grid-template-columns: 1fr; gap: 0.9rem; }
  .app__art, .app dl { grid-column: 1; }
  .milestone { grid-template-columns: 1fr; gap: 0.75rem; }
  .milestone__q { grid-column: 1; }
  .strip .wrap { flex-direction: column; align-items: flex-start; }
  .actions .button { width: 100%; }
  .invite__card img { width: 140px; }
}

@media (max-width: 380px) {
  .brand img { width: 136px; }
  .footer-top { grid-template-columns: 1fr; }
}

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

.reveal { opacity: 1; }

@media (prefers-reduced-motion: no-preference) {
  .js-reveal .reveal {
    opacity: 0;
    transform: translateY(18px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }
  .js-reveal .reveal.is-visible { opacity: 1; transform: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

@media print {
  .site-header, .menu-toggle, .actions { display: none; }
  .dark, .hero { background: #fff !important; color: #000 !important; }
}