section#hero {
  position: relative;
  flex: 1;
  display: flex;
  align-items: center;
  padding: clamp(2.5rem, 6vw, 6rem) clamp(1.5rem, 6vw, 4rem);
  overflow: hidden;
  border-bottom: 1px solid var(--accent-glow);
}

.hero-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  column-gap: clamp(2rem, 6vw, 5rem);
  row-gap: 0em;
  margin: 0 auto;
  width: 100%;
  max-width: 1200px;
}

.hero-copy {
  flex: 1 1 320px;
  max-width: 520px;
}

.hero-eyebrow {
  display: inline-block;
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.48em;
  font-size: 0.80rem;
  font-weight: 600;
  color: var(--text-faint);
}

.hero-copy h2 {
  margin: 0 0 1.75rem;
  text-shadow: 0 0 48px rgba(234, 160, 28, 0.25);
}

.hero-copy p {
  margin: 0 0 2.5rem;
  font-size: clamp(1.05rem, 1.6vw, 1.2rem);
  line-height: 1.7;
  color: var(--text-muted);
}

#hero .hero-actions {
  margin-bottom: 2.6rem;
}

.hero-footnote {
  text-transform: uppercase;
  letter-spacing: 0.36em;
  font-size: 0.72rem;
  color: var(--text-faint);
}

.hero-visual {
  position: relative;
  flex: 1 1 360px;
  max-width: 600px;
  min-height: clamp(260px, 42vw, 420px);
  border-radius: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 1px solid var(--accent-glow);
  box-shadow: 0 28px 80px var(--shadow-deep);
  overflow: hidden;
}

.hero-visual::after {
  content: '';
  position: absolute;
  inset: clamp(1rem, 3vw, 1.5rem);
  border-radius: 22px;
  pointer-events: none;
  mix-blend-mode: screen;
}

#three-container {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

#three-container canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.hero-three-viewer {
}

.preloader {
  position: absolute;
  left: 50%;
  bottom: 1.75rem;
  transform: translateX(-50%);
  letter-spacing: 0.42em;
  color: rgba(234, 212, 174, 0.55);
  font-size: 0.75rem;
  text-transform: uppercase;
  z-index: 3;
  transition: opacity 0.35s ease;
  pointer-events: none;
}

.hud {
  position: absolute;
  left: 0;
  bottom: 2.25rem;
  width: min(92%, 460px);
  padding: 1.35rem 1.65rem;
  text-transform: none;
  letter-spacing: normal;
  color: var(--text-light);
  background: linear-gradient(140deg, rgba(52, 40, 30, 0.82), rgba(24, 20, 16, 0.9));
  border: 1px solid var(--accent-glow);
  border-radius: 1.25rem;
  box-shadow: 0 18px 60px var(--shadow-strong), inset 0 0 0 1px rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(12px);
  overflow: hidden;
  pointer-events: none;
  opacity: 0;
  transform: translate3d(0, 14px, 0) scale(0.98);
  transition: opacity 0.65s ease, transform 0.65s cubic-bezier(0.18, 0.72, 0.32, 1);
  z-index: 4;
  user-select: none;
}

.hud.interactive {
  pointer-events: auto;
  cursor: move;
}

.hud.is-dragging {
  transition: none;
  cursor: grabbing;
}

.hud::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(234, 160, 28, 0.18), transparent 55%);
  opacity: 0.6;
  mix-blend-mode: screen;
  pointer-events: none;
}

.hud::after {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.04) 0,
    rgba(255, 255, 255, 0.04) 2px,
    transparent 2px,
    transparent 6px
  );
  animation: hudScan 11s linear infinite;
  opacity: 0.35;
  pointer-events: none;
}

.hud.is-active {
  opacity: 0.92;
  transform: translate3d(0, 0, 0) scale(1);
}

.hud-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.hud-label {
  font-weight: 600;
  white-space: nowrap;
}

.hud-signal {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 12px rgba(234, 160, 28, 0.75), 0 0 24px rgba(234, 160, 28, 0.42);
  animation: hudSignalPulse 2.2s ease-in-out infinite;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.hud-signal.interactive {
  cursor: pointer;
}

.hud-signal.interactive:hover {
  transform: scale(1.2);
  box-shadow: 0 0 18px rgba(234, 160, 28, 0.9), 0 0 36px rgba(234, 160, 28, 0.6);
}

.hud-frame {
  position: relative;
  padding-left: 0.7rem;
  border-left: 2px solid var(--accent-glow);
}

.hud-title {
  font-size: 0.7rem;
  font-weight: bold;
  color: rgba(250, 200, 120, 0.95);
  margin-bottom: 0.55rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
}

.hud-what {
  font-size: 0.75em;
  line-height: 1.5;
  font-weight: bold;
  color: var(--text-light);
  margin-bottom: 0.75rem;
}

.hud-result {
  font-size: 0.7rem;
  font-weight: bold;
  text-transform: uppercase;
  color: rgba(234, 160, 28, 0.86);
}

@media (max-width: 1024px) {
  .hero-inner {
    flex-direction: column;
    row-gap: clamp(1.75rem, 5vw, 2.5rem);
  }

  .hero-copy {
    max-width: 100%;
  }

  .hero-visual {
    width: 100%;
    order: -1;
    margin-bottom: 0;
  }

  #hero .hero-actions {
    justify-content: flex-start;
  }
}

@media (max-width: 900px) {
  .hero-three-viewer {
    width: min(100%, clamp(240px, 70vw, 420px));
  }

  #about .split-section__content {
    order: 1;
  }

  #about .split-section__visual {
    order: 2;
  }
}

@media (max-width: 768px) {
  .hero-copy h1 {
    letter-spacing: 0.08em;
  }

  #hero .hero-actions {
    justify-content: flex-start;
  }

  .hero-copy,
  .hero-footnote {
    text-align: left;
  }

  .hero-footnote {
    display: block;
  }

  .diagram-orbit {
    width: min(170px, 44%);
  }

  .diagram-tri-lens {
    width: min(190px, 48%);
  }
}

@keyframes hudSignalPulse {
  0%, 100% {
    transform: scale(0.94);
    opacity: 0.85;
  }
  46% {
    transform: scale(1.2);
    opacity: 1;
  }
}

@keyframes hudScan {
  0% {
    transform: translateY(-100%);
  }
  100% {
    transform: translateY(100%);
  }
}

/* Diagram: Orbit */
.diagram-orbit {
  position: relative;
  width: min(120px, 30%);
  aspect-ratio: 1;
  margin: 0 0 1rem;
  display: block;
}
.diagram-orbit svg {
  width: 100%;
  height: 100%;
  overflow: visible;
}

.orbit__shell {
  fill: url(#orbit-shell-bg);
  stroke: rgba(234,160,28,0.28);
  stroke-width: 1;
}

.orbit__shell-glow {
  fill: none;
  stroke: rgba(234,160,28,0.65);
  stroke-width: 30;
  opacity: 0.15;
  mix-blend-mode: screen;
  filter: url(#blur-12);
}

.orbit__ring {
  fill: none;
  stroke: rgba(234,160,28,0.20);
  stroke-width: 0.5;
  stroke-dasharray: 1 1;
}

.orbit__core {
  fill: url(#orbit-core-grad);
  stroke-width: 0.5;
  mix-blend-mode: screen;
  filter: url(#core-inner-shadow);
}

.orbit__agents circle {
  fill: var(--accent);
  filter: drop-shadow(0 0 5px var(--accent-soft));
}

/* Diagram: Tri-Lens */
.diagram-tri-lens {
  position: relative;
  width: min(140px, 35%);
  aspect-ratio: 1;
  margin: 0 0 1rem;
  display: block;
}

.diagram-tri-lens svg {
  width: 100%;
  height: 100%;
  overflow: visible;
}

.tri-lens__lens {
  fill: url(#lens-gradient);
  stroke: rgba(234, 160, 28, 0.25);
  stroke-width: 0.75;
  mix-blend-mode: screen;
}

.tri-lens__trace {
  fill: none;
  stroke: var(--accent);
  stroke-width: 0.75;
  stroke-dasharray: 1 4;
  stroke-linecap: round;
  transform-origin: 50% 50%;
  animation: rotateTrace 10s linear infinite;
  filter: drop-shadow(0 0 8px var(--accent-soft));
}

.tri-lens__agents circle {
  fill: var(--accent);
  filter: drop-shadow(0 0 6px var(--accent-soft));
}

.tri-lens__labels {
  font-family: "Inter", system-ui, sans-serif;
  font-size: 8px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  fill: var(--text-faint);
  pointer-events: none;
  -webkit-user-select: none;
  user-select: none;
}

@keyframes rotateTrace {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

/* Visual Signal (split-section content blocks) */
.visual-signal {
  display: grid;
  gap: 0.65rem;
  width: 100%;
  justify-items: start;
  align-content: start;
}

.visual-signal__badge {
  justify-self: start;
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  font-size: 0.7rem;
  background: rgba(234, 160, 28, 0.18);
  border: 1px solid rgba(234, 160, 28, 0.3);
  color: rgba(234, 160, 28, 0.85);
}

.visual-signal__headline {
  margin: 0;
  font-size: clamp(1.45rem, 3vw, 2rem);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(244, 239, 226, 0.92);
}

.visual-signal__meta {
  margin: 0;
  font-size: 0.88rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(244, 239, 226, 0.65);
}

.visual-signal__support {
  margin: 0;
  font-size: clamp(1rem, 2.2vw, 1.2rem);
  line-height: 1.6;
  color: rgba(244, 239, 226, 0.85);
}

.visual-signal__actions {
  margin-top: clamp(0.4rem, 1vw, 0.75rem);
}

.visual-signal__actions .button {
  letter-spacing: 0.22em;
}