.brand-mark {
  display: block;
  width: 46px;
  height: 46px;
  border: 1px solid #304b43;
  object-fit: cover;
  border-radius: 11px;
  color: transparent;
}

.app-icon {
  display: block;
  object-fit: cover;
  box-shadow: 0 14px 34px rgba(0, 0, 0, .28);
}

.app-links {
  display: flex;
  gap: 18px;
  margin-top: 24px;
  flex-wrap: wrap;
}

.app-links a {
  color: var(--ink);
  font-size: .82rem;
  text-decoration: none;
  border-bottom: 1px solid #416258;
  padding-bottom: 3px;
}

.app-links a:hover {
  color: var(--lime);
  border-color: var(--lime);
}

.tags { padding-top: 24px; }

/* A brighter signal palette, carried through the existing SEC layout. */
:root {
  --ink: #edf4ff;
  --muted: #acbdcf;
  --bg: #080f1c;
  --panel: #111e2d;
  --line: #2b3b50;
  --lime: #c4f36a;
  --cyan: #70e0dc;
}
body {
  background: radial-gradient(ellipse at 90% 8%, #123b493d, transparent 38%),
    radial-gradient(ellipse at 5% 30%, #263d7938, transparent 40%), var(--bg);
}
.brand-mark { border-color: #4b7181; }
.nav nav a:hover { color: var(--cyan); }
h1 em {
  color: var(--cyan);
  background: linear-gradient(105deg, #7bb8ff 5%, #70e0dc 65%, #c4f36a);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  -webkit-text-stroke: 0;
}
.eyebrow { color: #b7cbdc; }
.coordinates { color: #82a4bb; }
.primary {
  background: #bdec72;
  border-color: #bdec72;
  color: #102018;
  font-weight: 600;
}
.primary:hover { background: #d0ff88; border-color: #d0ff88; color: #102018; }
.signal i:nth-child(3n + 1) { background: #7bb8ff; }
.signal i:nth-child(3n + 2) { background: #c4f36a; }
.signal i:nth-child(3n) { background: #70e0dc; }
.card {
  --accent: #a4bcff;
  --accent-line: #445b8c;
  border-color: var(--accent-line);
  border-top: 3px solid var(--accent);
  background: linear-gradient(155deg, #202e4c, #111b2c 65%);
}
.card.rings {
  --accent: #f1c17e;
  --accent-line: #71573c;
  background: linear-gradient(155deg, #382c23, #1d1d24 65%);
}
.card.meter {
  --accent: #70e0dc;
  --accent-line: #326968;
  background: linear-gradient(155deg, #173b40, #11252e 65%);
}
.card:hover { border-color: var(--accent); }
.card h3, .card .number, .app-links a { color: var(--accent); }
.card-top { color: #afbecb; }
.status:before { background: var(--accent); }
.app-links a { border-color: var(--accent-line); }
.app-links a:hover { color: var(--ink); border-color: var(--accent); }
.tags span { color: #c5d1df; border-color: var(--accent-line); background: #080f1c38; }
.about-label { color: #f1c17e; }
.principles div:nth-child(1) b { color: #a4bcff; }
.principles div:nth-child(2) b { color: #f1c17e; }
.principles div:nth-child(3) b { color: #70e0dc; }
a:focus-visible { outline: 2px solid #f1c17e; outline-offset: 5px; }
@media (forced-colors: active) {
  h1 em { background: none; -webkit-text-fill-color: currentColor; }
}

/* Give the detailed SEC artwork enough room to remain legible. */
.brand-mark {
  width: 124px;
  height: 80px;
  flex-shrink: 0;
  object-fit: cover;
  object-position: center 46%;
  border: 2px solid #70e0dc;
  border-radius: 14px;
  background: #020b04;
  box-shadow: 0 0 0 4px #70e0dc12, 0 5px 24px #70e0dc20;
}
.nav { height: 108px; }
.brand { gap: 20px; }
@media (max-width: 800px) {
  .nav { height: 96px; }
  .brand-mark { width: 110px; height: 70px; }
  footer { column-gap: 16px; }
}

/* SEC's broader systems perspective. */
h1 { font-size: clamp(3rem, 7.1vw, 6.5rem); line-height: 1.04; letter-spacing: -.055em; }
.hero { min-height: 650px; }
.hero .intro { max-width: 700px; }
.hero .signal { width: 180px; }
.vision, .mission { padding: 100px 0; border-top: 1px solid var(--line); }
.section-intro { max-width: 790px; color: var(--muted); font-size: 1.125rem; margin: -20px 0 40px; }
.systems-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.system-panel { padding: 32px; border-top: 3px solid #a4bcff; background: linear-gradient(145deg, #202e4c, #111b2c); }
.design-panel { border-color: #f1c17e; background: linear-gradient(145deg, #382c23, #1d1d24); }
.panel-label { margin: 0 0 24px; color: #a4bcff; font-size: .875rem; letter-spacing: .08em; text-transform: uppercase; }
.design-panel .panel-label { color: #f1c17e; }
.system-panel h3, .signal-note h3 { font-size: 1.5rem; line-height: 1.3; margin: 0 0 24px; }
.system-panel > p:last-child, .signal-note p { color: var(--muted); margin-bottom: 0; }
.equation { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; padding: 22px 0; border-block: 1px solid #ffffff20; font-size: 1rem; }
.equation b { color: var(--muted); font-weight: 400; }
.equation strong { color: var(--cyan); }
.design-panel .equation strong { color: #f1c17e; }
.signal-note { display: grid; grid-template-columns: 1fr 2fr; gap: 30px; margin-top: 36px; padding: 30px 0 0; }
.signal-note h3 { color: var(--cyan); }
.signal-note p { margin-top: 0; }
.mission .section-head p { color: var(--cyan); }
.mission-copy { max-width: 790px; margin-left: auto; }
.mission-copy p { font-size: 1.125rem; color: var(--muted); }
.mission-copy .mission-lead { font-size: 1.5rem; color: var(--ink); line-height: 1.5; }
cite { font-style: italic; }
.mission-steps { list-style: none; padding: 32px; margin: 48px 0 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; background: linear-gradient(115deg, #163b40, #142238); border: 1px solid #326968; }
.mission-steps li > span { color: var(--cyan); font: .875rem ui-monospace, monospace; }
.mission-steps h3 { margin: 12px 0; font-size: 1.5rem; }
.mission-steps p { margin: 0; color: #b9cad8; }
.section-head p, .about-label, .eyebrow { font-size: .875rem; }
.tags span, .app-links a { font-size: .875rem; }
.card-top { font-size: .75rem; }
@media (max-width: 800px) {
  .nav nav { gap: 16px; }
  .hero { padding-top: 65px; min-height: 610px; }
  .hero .signal { right: 0; bottom: 28px; }
  .vision, .mission, .apps, .about { padding: 64px 0; }
  .systems-grid, .signal-note, .mission-steps { grid-template-columns: 1fr; }
  .system-panel, .mission-steps { padding: 24px; }
  .section-head { margin-bottom: 36px; }
  .section-intro { margin-top: 0; }
  .signal-note { gap: 0; }
  .mission-copy .mission-lead { font-size: 1.25rem; }
}
@media (max-width: 380px) {
  .nav nav { gap: 12px; }
  .nav nav a { font-size: .875rem; }
  .nav .brand-mark { width: 90px; height: 64px; }
}
@media (max-width: 800px) {
  h1 { font-size: clamp(2.25rem, 7.1vw, 4rem); }
}

.step-symbol {
  display: block;
  width: 56px;
  height: 56px;
  padding: 10px;
  margin-top: 20px;
  color: #70e0dc;
  background: #70e0dc12;
  border: 1px solid #70e0dc50;
  border-radius: 14px;
}
.mission-steps li:nth-child(2) .step-symbol {
  color: #a4bcff;
  background: #a4bcff12;
  border-color: #a4bcff50;
}
.mission-steps li:nth-child(3) .step-symbol {
  color: #f1c17e;
  background: #f1c17e12;
  border-color: #f1c17e50;
}

/* A more compact rhythm and a sensing-inspired header. */
.hero {
  min-height: 0;
  padding: 56px 0 60px;
  isolation: isolate;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(90deg, #080f1c 0%, #080f1ce0 40%, #080f1c30 68%),
    url('sec-aircraft-control.png') right center / auto 100% no-repeat;
  opacity: .8;
}
.hero h1 { font-size: clamp(2.5rem, 4.8vw, 4.2rem); margin: 28px 0 24px; max-width: 680px; }
.hero .intro { max-width: 560px; color: #c4d0df; }
.hero .primary { margin-top: 18px; }
.hero .signal, .hero .coordinates { display: none; }
.vision, .mission, .apps, .about { padding-top: 70px; padding-bottom: 70px; }
.section-head { margin-bottom: 40px; }
.section-head h2, .about h2 { font-size: clamp(2.3rem, 4.2vw, 4rem); }
.mission-steps { margin-top: 32px; }
.about-copy p:first-of-type { margin-top: 28px; }
.principles { margin-top: 36px; }
.card { min-height: 470px; }
.app-icon { margin-top: 36px; }
footer { min-height: 150px; }
@media (max-width: 800px) {
  .hero { padding: 42px 0 44px; }
  .hero h1 { font-size: clamp(2.25rem, 7.1vw, 4rem); }
  .hero::before {
    background: linear-gradient(90deg, #080f1ce8, #080f1ca6),
      linear-gradient(0deg, #080f1c, transparent 45%),
      url('sec-aircraft-control.png') right center / auto 100% no-repeat;
  }
  .vision, .mission, .apps, .about { padding-top: 48px; padding-bottom: 48px; }
  .section-head { margin-bottom: 28px; }
  .card { min-height: 0; }
  .app-icon { margin-top: 28px; }
}

/* Restrained editorial typography and a readable SEC mark. */
h1, h2, h3 { text-transform: uppercase; }
.hero h1 {
  font-size: clamp(2rem, 4vw, 3.5rem);
  line-height: 1.12;
  letter-spacing: .015em;
  font-weight: 600;
  max-width: 740px;
}
.hero h1 em {
  background: none;
  color: #b9c9d7;
  -webkit-text-fill-color: currentColor;
  -webkit-text-stroke: 0;
}
.section-head h2, .about h2 {
  font-size: clamp(2rem, 3.5vw, 3.1rem);
  line-height: 1.12;
  letter-spacing: .015em;
}
h3 { letter-spacing: .06em; }
.card h3 { font-size: 1.65rem; letter-spacing: .04em; }
.system-panel h3, .signal-note h3, .mission-steps h3 { font-size: 1.25rem; }
.hero .eyebrow { color: #aebdca; letter-spacing: .14em; }
.hero .eyebrow span { background: #9ebac7; box-shadow: none; }
.hero .primary { background: #cfdee5; border-color: #cfdee5; color: #101d28; }
.hero .primary:hover { background: #edf4f8; border-color: #edf4f8; }
.brand-name { font-size: calc(.78rem + 8px); }
.nav nav a { text-transform: uppercase; letter-spacing: .09em; font-size: .875rem; }
@media (max-width: 800px) {
  .hero h1 { font-size: clamp(1.85rem, 5.8vw, 3rem); letter-spacing: 0; }
  .nav nav { gap: 12px; }
  .nav nav a { font-size: .875rem; letter-spacing: .025em; }
}
@media (max-width: 380px) {
  .nav nav { gap: 8px; }
}