/* Landing Page Specific CSS (v3.5)
   Built on shared palette tokens in app.css.
   Strict adherence to WCAG AA, transform/opacity animation, and zero-JS readability. */

.landing-body {
  background-color: var(--color-sea-glass);
  color: var(--color-abyssal-ink);
  overflow-x: hidden;
}

.landing-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border-subtle);
  padding: 0.85rem 1.5rem;
}

.landing-header-inner {
  max-width: 1160px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.landing-nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.landing-nav-link {
  color: var(--color-muted-text);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.15s ease;
}

.landing-nav-link:hover,
.landing-nav-link:focus-visible {
  color: var(--color-abyssal-ink);
}

.landing-signin-btn {
  margin-left: 0.5rem;
}

.landing-container {
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.landing-section {
  padding: 4.5rem 0;
}

/* Hero Section */
.hero-section {
  padding: 5rem 0 4rem;
  perspective: 1200px;
}

.hero-container {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 3.5rem;
}

.hero-title {
  font-size: 2.75rem;
  line-height: 1.15;
  font-weight: 600;
  letter-spacing: -0.025em;
  color: var(--color-abyssal-ink);
  margin-bottom: 1.25rem;
}

.hero-subhead {
  font-size: 1.15rem;
  line-height: 1.6;
  color: var(--color-muted-text);
  margin-bottom: 2rem;
  max-width: 540px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.hero-cta-btn {
  padding: 0.75rem 1.75rem;
  font-size: 1rem;
}

/* 3D Chassis Visual */
.hero-chassis {
  perspective: 1000px;
  display: flex;
  justify-content: center;
}

.chassis-plate {
  background: var(--color-signal-white);
  border: 1px solid var(--color-border-subtle);
  border-radius: 6px;
  padding: 1.5rem;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 12px 32px rgba(20, 28, 43, 0.08);
  transform: rotateX(16deg) rotateY(-12deg) rotateZ(3deg);
  transform-style: preserve-3d;
  transition: transform 0.5s ease;
  will-change: transform;
}

.chassis-plate:hover {
  transform: rotateX(8deg) rotateY(-6deg) rotateZ(1deg);
}

.chassis-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding-bottom: 1rem;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--color-border-subtle);
}

.chassis-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-active-veridian);
  box-shadow: 0 0 0 3px rgba(13, 125, 85, 0.2);
}

.chassis-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--color-muted-text);
}

.chassis-nodes {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.pipeline-stage-node {
  background: var(--color-sea-glass);
  border: 1px solid var(--color-border-subtle);
  border-radius: 4px;
  padding: 0.65rem 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.85rem;
  will-change: transform, opacity;
}

.node-idx {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-cobalt-beacon);
}

.node-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-abyssal-ink);
  min-width: 85px;
}

.node-desc {
  font-size: 0.8rem;
  color: var(--color-muted-text);
}

/* Section Intros */
.section-intro {
  margin-bottom: 2.5rem;
}

.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--color-cobalt-beacon);
  margin-bottom: 0.5rem;
  text-transform: uppercase;
}

.section-title {
  font-size: 2rem;
  line-height: 1.25;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--color-abyssal-ink);
  margin-bottom: 0.85rem;
}

.section-lead {
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--color-muted-text);
  max-width: 780px;
}

/* Problem Section */
.problem-section {
  background-color: var(--color-signal-white);
  border-top: 1px solid var(--color-border-subtle);
  border-bottom: 1px solid var(--color-border-subtle);
}

/* Pipeline Stages Grid */
.stages-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}

/* 2-column range: last card spans the full row so it is not an orphan */
.stages-grid .stage-step-card:nth-child(5) {
  grid-column: 1 / -1;
}

@media (min-width: 768px) {
  .stages-grid {
    grid-template-columns: repeat(6, 1fr);
  }

  .stages-grid .stage-step-card:nth-child(1),
  .stages-grid .stage-step-card:nth-child(2),
  .stages-grid .stage-step-card:nth-child(3) {
    grid-column: span 2;
  }

  .stages-grid .stage-step-card:nth-child(4),
  .stages-grid .stage-step-card:nth-child(5) {
    grid-column: span 3;
  }
}

@media (min-width: 1100px) {
  .stages-grid {
    grid-template-columns: repeat(5, 1fr);
  }

  .stages-grid .stage-step-card:nth-child(n) {
    grid-column: span 1;
  }
}

@media (max-width: 520px) {
  .stages-grid {
    grid-template-columns: 1fr;
  }
}

.stage-step-card {
  background: var(--color-signal-white);
  border: 1px solid var(--color-border-subtle);
  border-radius: 6px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  will-change: transform, opacity;
}

.stage-step-header {
  margin-bottom: 0.85rem;
}

.stage-step-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-cobalt-beacon);
  display: block;
  margin-bottom: 0.35rem;
}

.stage-step-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-abyssal-ink);
}

.stage-step-text {
  font-size: 0.88rem;
  line-height: 1.55;
  color: var(--color-muted-text);
  margin-bottom: 1.25rem;
}

.stage-step-source {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-muted-text);
  background: var(--color-sea-glass);
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  align-self: flex-start;
}

/* Features Grid */
.features-section {
  background: var(--color-signal-white);
  border-top: 1px solid var(--color-border-subtle);
  border-bottom: 1px solid var(--color-border-subtle);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.feature-item {
  border-left: 2px solid var(--color-cobalt-beacon);
  padding: 0.5rem 0 0.5rem 1.25rem;
  will-change: transform, opacity;
}

.feature-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-abyssal-ink);
  margin-bottom: 0.35rem;
}

.feature-desc {
  font-size: 0.9rem;
  line-height: 1.55;
  color: var(--color-muted-text);
}

/* Trust Section */
.trust-card {
  background: var(--color-signal-white);
  border: 1px solid var(--color-border-subtle);
  border-radius: 6px;
  padding: 2.5rem;
  will-change: transform, opacity;
}

.trust-lead {
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--color-muted-text);
  margin-bottom: 1.75rem;
  max-width: 820px;
}

.trust-code-chassis {
  background: var(--color-abyssal-ink);
  border-radius: 4px;
  padding: 1.25rem 1.5rem;
  color: var(--color-signal-white);
}

.trust-code-chassis .chassis-label {
  color: #8fa0ba;
  display: block;
  margin-bottom: 0.5rem;
}

.trust-code {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: #d1e2fc;
  display: block;
  word-break: break-all;
}

/* CTA Section */
.cta-section {
  text-align: center;
  background: var(--color-signal-white);
  border-top: 1px solid var(--color-border-subtle);
}

.cta-container {
  max-width: 640px;
}

.cta-title {
  font-size: 2.2rem;
  font-weight: 600;
  color: var(--color-abyssal-ink);
  margin-bottom: 0.85rem;
  letter-spacing: -0.02em;
}

.cta-desc {
  font-size: 1.1rem;
  line-height: 1.55;
  color: var(--color-muted-text);
  margin-bottom: 2rem;
}

.cta-btn {
  padding: 0.85rem 2.25rem;
  font-size: 1.05rem;
}

/* Footer */
.landing-footer {
  border-top: 1px solid var(--color-border-subtle);
  background-color: var(--color-sea-glass);
  padding: 2rem 0;
}

.footer-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--color-muted-text);
}

.footer-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.footer-link {
  font-size: 0.85rem;
  color: var(--color-muted-text);
  text-decoration: none;
}

.footer-link:hover,
.footer-link:focus-visible {
  color: var(--color-abyssal-ink);
}

/* Accessible focus ring */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-cobalt-beacon);
  outline-offset: 2px;
}

/* Responsive adjustments */
@media (max-width: 900px) {
  .hero-container {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .chassis-plate {
    transform: none;
    max-width: 100%;
  }

  .chassis-plate:hover {
    transform: none;
  }

  .hero-title {
    font-size: 2.2rem;
  }
}

@media (max-width: 600px) {
  .landing-header-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .landing-nav {
    flex-wrap: wrap;
    gap: 0.75rem;
  }

  .hero-title {
    font-size: 1.85rem;
  }

  .section-title {
    font-size: 1.6rem;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .footer-container {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    transform: none !important;
  }
}

/* Terms & acceptable-use page (v3.6b A8) */
.terms-content {
  max-width: 760px;
  line-height: 1.65;
}

.terms-content h2 {
  margin-top: 2rem;
  font-size: 1.15rem;
}

.terms-content ul {
  padding-left: 1.25rem;
}

.terms-content li {
  margin-bottom: 0.4rem;
}

.terms-updated {
  color: var(--color-muted-text);
  font-size: 0.9rem;
}