/* ==========================================================================
   CEEZAER — Osvald-inspired design system
   Minimal monochrome editorial: off-white paper, near-black ink, hairline
   rules, oversized display type (Inter Tight) with Instrument Serif italic
   accents, uppercase micro-labels with technical metadata.
   Used by index.html and services/index.html (both skip-listed in
   unify_chrome). Portfolio styles for the services page are at the bottom.
   ========================================================================== */

:root {
  --os-paper: #fafafa;
  --os-ink: #010101;
  --os-soft: #323232;
  --os-muted: #797979;
  --os-line: #dedede;
  --os-dark: #0a0a0a;
  --os-dark-line: #232323;
  --os-dark-text: #ededed;
  --os-dark-muted: #8f8f8f;
  --os-max: 1400px;
  --os-gutter: 40px;
  --os-sans: "Inter Tight", "Helvetica Neue", Arial, sans-serif;
  --os-serif: "Instrument Serif", Georgia, serif;
}

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

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

body {
  font-family: var(--os-sans);
  background: var(--os-paper);
  color: var(--os-ink);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

::selection { background: var(--os-ink); color: var(--os-paper); }

.os-container {
  max-width: var(--os-max);
  margin: 0 auto;
  padding: 0 var(--os-gutter);
}

/* ---------- Type utilities ---------- */

.os-label {
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--os-muted);
}

.os-label b, .os-label strong {
  color: var(--os-ink);
  font-weight: 500;
}

.os-serif-it {
  font-family: var(--os-serif);
  font-style: italic;
  font-weight: 400;
  letter-spacing: 0;
}

/* ---------- Buttons ---------- */

.os-btn {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  padding: 14px 28px;
  border: 1px solid var(--os-ink);
  background: var(--os-ink);
  color: var(--os-paper);
  cursor: pointer;
  transition: background .25s ease, color .25s ease;
}

.os-btn:hover { background: transparent; color: var(--os-ink); }

.os-btn-ghost { background: transparent; color: var(--os-ink); }
.os-btn-ghost:hover { background: var(--os-ink); color: var(--os-paper); }

.os-btn-light { border-color: var(--os-dark-text); background: var(--os-dark-text); color: var(--os-dark); }
.os-btn-light:hover { background: transparent; color: var(--os-dark-text); }

.os-textlink {
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  border-bottom: 1px solid var(--os-ink);
  padding-bottom: 3px;
  transition: opacity .2s ease;
}

.os-textlink:hover { opacity: .55; }

/* ---------- Header ---------- */

.os-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  background: rgba(250, 250, 250, .88);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--os-line);
}

.os-header-inner {
  max-width: var(--os-max);
  margin: 0 auto;
  padding: 0 var(--os-gutter);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
}

.os-logo {
  font-size: 15px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.18em;
}

.os-logo sup {
  font-size: 8px;
  letter-spacing: 0;
  vertical-align: super;
}

.os-nav {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 36px;
}

.os-nav a {
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  transition: opacity .2s ease;
}

.os-nav a:hover { opacity: .5; }

.os-header-cta {
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  border: 1px solid var(--os-ink);
  padding: 9px 20px;
  transition: background .25s ease, color .25s ease;
}

.os-header-cta:hover { background: var(--os-ink); color: var(--os-paper); }

.os-burger {
  display: none;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 10px 0 10px 10px;
}

.os-burger span {
  display: block;
  width: 24px;
  height: 1.5px;
  background: var(--os-ink);
  margin: 5px 0;
  transition: transform .25s ease, opacity .25s ease;
}

/* ---------- Mobile drawer ---------- */

.os-drawer {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: var(--os-dark);
  color: var(--os-dark-text);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0 var(--os-gutter);
  opacity: 0;
  visibility: hidden;
  transition: opacity .3s ease, visibility .3s ease;
}

body.os-drawer-open .os-drawer { opacity: 1; visibility: visible; }
body.os-drawer-open { overflow: hidden; }

.os-drawer a {
  font-size: clamp(28px, 7vw, 44px);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: -0.01em;
  line-height: 1.5;
  border-bottom: 1px solid var(--os-dark-line);
  padding: 10px 0;
  transition: color .2s ease;
}

.os-drawer a:hover { color: var(--os-dark-muted); }

.os-drawer-close {
  position: absolute;
  top: 14px;
  right: var(--os-gutter);
  background: none;
  border: 0;
  color: var(--os-dark-text);
  font-size: 34px;
  line-height: 1;
  cursor: pointer;
}

.os-drawer-meta {
  margin-top: 32px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--os-dark-muted);
}

/* ---------- Hero ---------- */

.os-hero { padding-top: 64px; }

.os-hero-meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-bottom: 1px solid var(--os-line);
}

.os-hero-meta > div {
  padding: 16px 0;
  display: flex;
  gap: 10px;
  justify-content: center;
}

.os-hero-meta > div + div { border-left: 1px solid var(--os-line); }

.os-display {
  font-size: clamp(64px, 14.5vw, 210px);
  font-weight: 500;
  line-height: 0.92;
  letter-spacing: -0.045em;
  text-transform: uppercase;
  padding: clamp(48px, 8vw, 120px) 0 clamp(28px, 4vw, 56px);
}

.os-display .os-serif-it {
  display: block;
  text-transform: none;
  font-size: 0.94em;
}

.os-hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: end;
  padding-bottom: clamp(40px, 6vw, 80px);
}

.os-hero-specs { display: grid; gap: 8px; }

.os-hero-intro { max-width: 520px; justify-self: end; }

.os-hero-intro p {
  font-size: 17px;
  line-height: 1.6;
  color: var(--os-soft);
  margin-bottom: 28px;
}

.os-hero-actions { display: flex; gap: 20px; align-items: center; flex-wrap: wrap; }

/* Hero media — background video with poster fallback */

.os-hero-media {
  position: relative;
  height: min(82vh, 760px);
  overflow: hidden;
  background: url('/images/aerial-showcase.jpg') center / cover no-repeat;
}

.os-hero-media iframe,
.os-hero-media #heroVideo {
  position: absolute;
  top: 50%; left: 50%;
  width: max(100vw, 178vh);
  height: max(101vh, 57vw);
  transform: translate(-50%, -50%);
  border: 0;
  pointer-events: none;
  opacity: 0;
  transition: opacity .9s ease;
}

.os-hero-media.is-playing iframe,
.os-hero-media.is-playing #heroVideo { opacity: 1; }

.os-hero-media-caption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  z-index: 2;
  display: flex;
  justify-content: space-between;
  padding: 18px var(--os-gutter);
  color: #fff;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  text-shadow: 0 1px 8px rgba(0,0,0,.5);
}

/* ---------- Marquee ---------- */

.os-marquee {
  border-top: 1px solid var(--os-line);
  border-bottom: 1px solid var(--os-line);
  overflow: hidden;
  padding: 14px 0;
  white-space: nowrap;
}

.os-marquee-track {
  display: inline-flex;
  animation: os-scroll 36s linear infinite;
}

.os-marquee span {
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  padding: 0 28px;
  color: var(--os-soft);
}

@keyframes os-scroll {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

@media (prefers-reduced-motion: reduce) {
  .os-marquee-track { animation: none; }
}

/* ---------- Sections ---------- */

.os-section { padding: clamp(80px, 10vw, 150px) 0; }

.os-section-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-top: 1px solid var(--os-ink);
  padding-top: 16px;
  margin-bottom: clamp(36px, 5vw, 64px);
}

.os-h2 {
  font-size: clamp(38px, 6vw, 84px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.035em;
}

.os-h2 .os-serif-it { font-size: 1.02em; }

/* ---------- About ---------- */

.os-about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.os-about-copy { max-width: 560px; justify-self: end; }

.os-about-copy p {
  font-size: 17px;
  line-height: 1.65;
  color: var(--os-soft);
  margin-bottom: 20px;
}

.os-pullquote {
  font-family: var(--os-serif);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(26px, 3.6vw, 46px);
  line-height: 1.25;
  text-align: center;
  max-width: 900px;
  margin: 0 auto;
  padding: clamp(60px, 8vw, 110px) var(--os-gutter) 0;
}

/* ---------- Work / missions ---------- */

.os-work-item {
  display: grid;
  grid-template-columns: 64px 1fr 1fr;
  gap: 48px;
  border-top: 1px solid var(--os-line);
  padding: clamp(32px, 4vw, 56px) 0;
}

.os-work-item:last-child { border-bottom: 1px solid var(--os-line); }

.os-work-num {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--os-muted);
  padding-top: 6px;
}

.os-work-media {
  overflow: hidden;
  aspect-ratio: 16 / 10;
}

.os-work-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .8s ease;
}

.os-work-item:hover .os-work-media img { transform: scale(1.04); }

.os-work-body { display: flex; flex-direction: column; }

.os-work-body h3 {
  font-size: clamp(24px, 3vw, 38px);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin-bottom: 16px;
}

.os-work-body p {
  font-size: 15px;
  line-height: 1.6;
  color: var(--os-soft);
  max-width: 480px;
}

.os-work-meta {
  margin-top: auto;
  padding-top: 28px;
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}

/* ---------- Numbers (dark) ---------- */

.os-numbers {
  background: var(--os-dark);
  color: var(--os-dark-text);
}

.os-numbers .os-section-head { border-top-color: var(--os-dark-text); }
.os-numbers .os-label { color: var(--os-dark-muted); }
.os-numbers .os-label b { color: var(--os-dark-text); }

.os-numbers-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.os-number-cell { padding: 8px 32px 8px 0; }

.os-number-cell + .os-number-cell {
  border-left: 1px solid var(--os-dark-line);
  padding-left: 32px;
}

.os-number-value {
  font-size: clamp(52px, 6.5vw, 104px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.03em;
}

.os-number-value sub {
  font-size: 0.32em;
  font-weight: 500;
  vertical-align: baseline;
  letter-spacing: 0;
}

.os-number-cell .os-label { display: block; margin-top: 14px; }

/* ---------- Services ---------- */

.os-service-row {
  display: grid;
  grid-template-columns: 64px 1fr 1fr 140px;
  gap: 32px;
  align-items: center;
  border-top: 1px solid var(--os-line);
  padding: clamp(28px, 3.4vw, 44px) 12px;
  transition: background .3s ease, color .3s ease;
}

.os-service-row:last-of-type { border-bottom: 1px solid var(--os-line); }

.os-service-row:hover { background: var(--os-ink); color: var(--os-paper); }

.os-service-num {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--os-muted);
}

.os-service-row h3 {
  font-size: clamp(22px, 2.8vw, 34px);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.05;
}

.os-service-row p {
  font-size: 14px;
  line-height: 1.55;
  color: var(--os-muted);
  max-width: 460px;
}

.os-service-row:hover p,
.os-service-row:hover .os-service-num { color: #b5b5b5; }

.os-service-arrow {
  justify-self: end;
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

/* ---------- Field videos ---------- */

.os-videos-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.os-video {
  aspect-ratio: 16 / 9;
  border: 1px solid var(--os-line);
  background: #111;
}

.os-video iframe { width: 100%; height: 100%; border: 0; display: block; }

.os-videos-foot {
  display: flex;
  justify-content: center;
  padding-top: 48px;
}

/* ---------- CTA ---------- */

.os-cta {
  border-top: 1px solid var(--os-line);
  text-align: center;
}

.os-cta .os-display-sm {
  font-size: clamp(52px, 9vw, 140px);
  font-weight: 500;
  line-height: 0.95;
  letter-spacing: -0.04em;
  text-transform: uppercase;
  margin-bottom: 40px;
}

.os-cta .os-display-sm .os-serif-it { text-transform: none; }

.os-cta-actions {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- Contact / form ---------- */

.os-contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: clamp(48px, 6vw, 96px);
  align-items: start;
}

.os-contact-info h2 { margin-bottom: 24px; }

.os-contact-info > p {
  font-size: 16px;
  line-height: 1.65;
  color: var(--os-soft);
  max-width: 420px;
  margin-bottom: 40px;
}

.os-contact-lines { display: grid; gap: 0; }

.os-contact-lines > div {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  border-top: 1px solid var(--os-line);
  padding: 14px 0;
}

.os-contact-lines a { border-bottom: 1px solid var(--os-ink); }
.os-contact-lines address { font-style: normal; }
.os-contact-lines .os-value { font-size: 14px; font-weight: 500; }

/* Form */

.inquiry-form {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px 32px;
}

.inquiry-form > div { display: flex; flex-direction: column; }

.inquiry-form .full { grid-column: 1 / -1; }

.inquiry-form label {
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--os-muted);
  margin-bottom: 8px;
}

.inquiry-form label .opt { text-transform: none; letter-spacing: 0.04em; }

.inquiry-form input,
.inquiry-form select,
.inquiry-form textarea {
  font-family: var(--os-sans);
  font-size: 16px;
  color: var(--os-ink);
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--os-line);
  border-radius: 0;
  padding: 10px 0;
  outline: none;
  transition: border-color .25s ease;
  -webkit-appearance: none;
  appearance: none;
}

.inquiry-form select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%23010101' stroke-width='1.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 2px center;
  padding-right: 24px;
}

.inquiry-form input:focus,
.inquiry-form select:focus,
.inquiry-form textarea:focus { border-bottom-color: var(--os-ink); }

.inquiry-form ::placeholder { color: #b5b5b5; }

.inquiry-form textarea { resize: vertical; min-height: 96px; }

.inquiry-form .submit-row { grid-column: 1 / -1; padding-top: 8px; }

.form-submit-btn {
  position: relative;
  width: 100%;
  font-family: var(--os-sans);
  font-size: 12px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  padding: 18px 28px;
  border: 1px solid var(--os-ink);
  background: var(--os-ink);
  color: var(--os-paper);
  cursor: pointer;
  transition: background .25s ease, color .25s ease;
}

.form-submit-btn:hover:not(:disabled) { background: transparent; color: var(--os-ink); }
.form-submit-btn:disabled { cursor: default; opacity: .75; }

.form-submit-btn .spinner {
  display: none;
  position: absolute;
  left: 50%; top: 50%;
  width: 16px; height: 16px;
  margin: -8px 0 0 -8px;
  border: 2px solid rgba(250,250,250,.35);
  border-top-color: var(--os-paper);
  border-radius: 50%;
  animation: os-spin .7s linear infinite;
}

.form-submit-btn.loading .spinner { display: block; }
.form-submit-btn.loading .btn-text { visibility: hidden; }

@keyframes os-spin { to { transform: rotate(360deg); } }

.form-success {
  display: none;
  border: 1px solid var(--os-line);
  padding: 48px 32px;
  text-align: center;
}

.form-success.visible { display: block; }

.form-success .success-icon svg {
  width: 40px; height: 40px;
  margin: 0 auto 20px;
  display: block;
}

.form-success h3 {
  font-size: 26px;
  font-weight: 500;
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.form-success p { color: var(--os-soft); margin-bottom: 28px; }

.os-form-trust {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  padding-top: 24px;
}

/* ---------- Footer ---------- */

.os-footer {
  background: var(--os-dark);
  color: var(--os-dark-text);
  padding-top: clamp(64px, 8vw, 110px);
}

.os-footer-cols {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: clamp(48px, 6vw, 80px);
}

.os-footer-tag {
  font-size: 14px;
  line-height: 1.65;
  color: var(--os-dark-muted);
  max-width: 320px;
  margin-top: 14px;
}

.os-footer h4 {
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--os-dark-muted);
  margin-bottom: 18px;
}

.os-footer-cols ul { display: grid; gap: 10px; }

.os-footer-cols li a, .os-footer-cols address {
  font-size: 14px;
  font-style: normal;
  color: var(--os-dark-text);
  transition: color .2s ease;
}

.os-footer-cols li a:hover { color: var(--os-dark-muted); }

.os-footer-mark {
  font-size: clamp(68px, 16.5vw, 246px);
  font-weight: 600;
  line-height: 0.85;
  letter-spacing: -0.03em;
  text-transform: uppercase;
  text-align: center;
  color: var(--os-dark-text);
  padding: 0 var(--os-gutter);
  user-select: none;
}

.os-footer-bottom {
  border-top: 1px solid var(--os-dark-line);
  margin-top: -6px;
  padding: 20px 0 24px;
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.os-footer-bottom span {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--os-dark-muted);
}

/* ---------- Scroll reveals ---------- */

html.os-motion .os-reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity .8s ease var(--os-d, 0ms), transform .8s ease var(--os-d, 0ms);
}

html.os-motion .os-reveal.os-in { opacity: 1; transform: none; }

/* ---------- Portfolio (services page) ---------- */

.os-page-hero { padding-top: 64px; }

.os-page-hero .os-display {
  font-size: clamp(52px, 10.5vw, 150px);
  padding: clamp(40px, 6vw, 88px) 0 clamp(24px, 3vw, 44px);
}

.os-page-hero .os-display .os-serif-it { display: inline; font-size: 1em; }

.os-page-hero-intro {
  max-width: 560px;
  font-size: 17px;
  line-height: 1.6;
  color: var(--os-soft);
  padding-bottom: clamp(36px, 5vw, 64px);
}

/* Filter bar */

.os-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  border-top: 1px solid var(--os-line);
  border-bottom: 1px solid var(--os-line);
  padding: 16px 0;
  margin-bottom: clamp(32px, 4vw, 56px);
}

.os-filter button {
  font-family: var(--os-sans);
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--os-muted);
  background: transparent;
  border: 1px solid var(--os-line);
  padding: 8px 18px;
  cursor: pointer;
  transition: background .2s ease, color .2s ease, border-color .2s ease;
}

.os-filter button:hover { border-color: var(--os-ink); color: var(--os-ink); }

.os-filter button.active {
  background: var(--os-ink);
  border-color: var(--os-ink);
  color: var(--os-paper);
}

/* Flight grid */

.os-flight-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px 24px;
}

.os-tile.os-hide { display: none; }

.os-tile-media {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #111;
  border: 1px solid var(--os-line);
  cursor: pointer;
}

button.os-tile-media {
  display: block;
  width: 100%;
  padding: 0;
  font: inherit;
  -webkit-appearance: none;
  appearance: none;
}

.os-tile-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .7s ease, opacity .4s ease;
}

.os-tile-media:hover img { transform: scale(1.04); }

.os-tile-media iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.os-tile-play {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.os-tile-play span {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: #fff;
  background: rgba(1, 1, 1, .72);
  padding: 12px 22px;
  transition: background .2s ease;
}

.os-tile-media:hover .os-tile-play span { background: var(--os-ink); }

.os-tile-play svg { width: 10px; height: 12px; }

.os-tile-caption {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  border-bottom: 1px solid var(--os-line);
  padding: 14px 0;
}

.os-tile-caption h3 {
  font-size: 17px;
  font-weight: 500;
  letter-spacing: -0.01em;
}

/* Stills grid */

.os-stills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.os-stills-grid .os-tile-media { cursor: default; aspect-ratio: 4 / 3; }

@media (max-width: 900px) {
  .os-flight-grid { grid-template-columns: 1fr; }
  .os-stills-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 600px) {
  .os-stills-grid { grid-template-columns: 1fr; }
}

/* ---------- Duo tiles (publications / products) ---------- */

.os-duo-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.os-duo-grid .os-tile-media { aspect-ratio: 16 / 10; }

a.os-tile-media { display: block; }

.os-tile-media.os-contain { background: #efeee6; }

.os-tile-media.os-contain img {
  object-fit: contain;
  padding: 20px;
  box-sizing: border-box;
}

.os-tile-desc {
  font-size: 14px;
  line-height: 1.6;
  color: var(--os-muted);
  padding-top: 12px;
  max-width: 520px;
}

@media (max-width: 900px) {
  .os-duo-grid { grid-template-columns: 1fr; }
}

/* ---------- Feature grid (platform / subpages) ---------- */

.os-feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--os-line);
  border: 1px solid var(--os-line);
}

.os-feature-cell {
  background: var(--os-paper);
  padding: 32px 28px 36px;
  min-height: 220px;
  display: flex;
  flex-direction: column;
}

.os-feature-cell .os-label { margin-bottom: auto; }

.os-feature-cell h3 {
  font-size: 22px;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin: 28px 0 10px;
}

.os-feature-cell p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--os-muted);
}

@media (max-width: 900px) {
  .os-feature-grid { grid-template-columns: 1fr; }
  .os-feature-cell { min-height: 0; }
  .os-feature-cell h3 { margin-top: 20px; }
}

/* ---------- Prose (subpage body copy) ---------- */

.os-prose { max-width: 720px; }

.os-prose p {
  font-size: 16px;
  line-height: 1.7;
  color: var(--os-soft);
  margin-bottom: 18px;
}

.os-prose h3 {
  font-size: 24px;
  font-weight: 500;
  letter-spacing: -0.02em;
  margin: 40px 0 14px;
}

.os-prose ul {
  margin: 0 0 18px;
  display: grid;
  gap: 10px;
}

.os-prose li {
  font-size: 15px;
  line-height: 1.6;
  color: var(--os-soft);
  border-top: 1px solid var(--os-line);
  padding-top: 10px;
}

/* ---------- Responsive ---------- */

@media (max-width: 1024px) {
  .os-work-item { grid-template-columns: 40px 1fr 1fr; gap: 28px; }
  .os-service-row { grid-template-columns: 40px 1fr 1fr; }
  .os-service-arrow { display: none; }
  .os-numbers-grid { grid-template-columns: 1fr 1fr; gap: 40px 0; }
  .os-number-cell:nth-child(odd) { border-left: 0; padding-left: 0; }
  .os-number-cell:nth-child(3) { border-left: 0; padding-left: 0; }
}

@media (max-width: 900px) {
  .os-nav, .os-header-cta { display: none; }
  .os-burger { display: block; }
  .os-hero-grid, .os-about-grid, .os-contact-grid { grid-template-columns: 1fr; }
  .os-hero-intro, .os-about-copy { justify-self: start; }
  .os-videos-grid { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  :root { --os-gutter: 20px; }
  .os-hero-meta { grid-template-columns: 1fr; }
  .os-hero-meta > div { justify-content: flex-start; }
  .os-hero-meta > div + div { border-left: 0; border-top: 1px solid var(--os-line); }
  .os-work-item { grid-template-columns: 1fr; gap: 20px; }
  .os-work-num { padding-top: 0; }
  .os-service-row { grid-template-columns: 1fr; gap: 12px; padding-left: 0; padding-right: 0; }
  .os-service-row:hover { background: transparent; color: inherit; }
  .os-service-row:hover p, .os-service-row:hover .os-service-num { color: var(--os-muted); }
  .os-numbers-grid { grid-template-columns: 1fr; gap: 36px; }
  .os-number-cell { border-left: 0 !important; padding-left: 0 !important; }
  .inquiry-form { grid-template-columns: 1fr; }
  .os-section-head { flex-direction: column; gap: 6px; }
  .os-hero-media { height: 60vh; }
  .os-hero-media-caption { display: none; }
}