app/frontend/src/theme/app.css

.app-shell {
  width: var(--shell);
  margin: 0 auto;
  padding: 24px 0 48px;
}

.centered {
  min-height: 100vh;
  display: grid;
  place-items: center;
}

.shell-block {
  margin-bottom: 20px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(10, 24, 42, 0.92), rgba(8, 16, 30, 0.9));
  backdrop-filter: blur(18px);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
}

.topnav,
.section,
.footer-cta,
.hero {
  padding: 22px;
}

.topnav {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 18px;
  align-items: center;
  position: sticky;
  top: 14px;
  z-index: 10;
}

.brand-block {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-mark {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, rgba(92, 210, 255, 0.22), rgba(132, 255, 225, 0.1));
  border: 1px solid var(--line-strong);
  position: relative;
  overflow: hidden;
}

.brand-mark span {
  position: absolute;
  width: 24px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
}

.brand-mark span:first-child {
  transform: rotate(25deg);
}

.brand-mark span:last-child {
  transform: rotate(-25deg);
}

.brand-name,
.brand-subtitle,
.section-kicker,
.section-description,
.hero-trust,
.metric-card span,
.feature-card dt,
.workflow-outcome,
.seed-purpose,
.nav-meta a,
.route-card span,
.lane-card p,
.doc-card p,
.faq-item p,
.contract-meta a {
  color: var(--muted);
}

.brand-name,
.brand-subtitle {
  margin: 0;
}

.brand-name {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

.brand-subtitle {
  font-size: 0.98rem;
}

.primary-nav,
.nav-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.primary-nav {
  justify-content: center;
}

.primary-nav a,
.nav-meta a,
.doc-card,
.faq-item summary {
  transition: color 160ms ease, border-color 160ms ease, background 160ms ease, transform 160ms ease;
}

.primary-nav a:hover,
.nav-meta a:hover,
.doc-card:hover,
.faq-item summary:hover {
  color: var(--text);
}

.mode-chip,
.route-pill,
.status-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 28px;
  padding: 0 12px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: var(--accent-soft);
  font-size: 0.78rem;
}

.mode-chip.demo,
.status-badge.live {
  color: var(--good);
}

.mode-chip.live,
.status-badge.in-build {
  color: var(--warn);
}

.status-badge.planned {
  color: var(--planned);
}

.hero {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 24px;
  overflow: hidden;
}

.hero-copy h1,
.section h2,
.footer-cta h2,
.workbench-copy h3,
.detail-head h3,
.studio-story h3,
.lane-card h3,
.contract-meta strong,
.arch-card h3,
.doc-card h3,
.image-card img,
.seed-list-head h4 {
  font-family: var(--title-font);
}

.hero-copy h1 {
  margin: 10px 0 14px;
  font-size: clamp(2.9rem, 6vw, 5.6rem);
  line-height: 0.94;
  max-width: 9ch;
}

.hero-statement {
  font-size: 1.08rem;
  line-height: 1.7;
  max-width: 60ch;
}

.hero-trust {
  margin-top: 18px;
  max-width: 62ch;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  cursor: pointer;
}

.button.primary {
  background: linear-gradient(135deg, #5cd2ff, #84ffe1);
  color: #041018;
  font-weight: 600;
  border-color: transparent;
}

.button.ghost {
  background: rgba(255, 255, 255, 0.02);
  color: var(--text);
}

.hero-actions,
.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 26px;
}

.metric-card,
.feature-card,
.pillar-card,
.seed-card,
.route-card,
.workflow-card,
.demo-console,
.lane-card,
.doc-card,
.arch-card,
.faq-item,
.contract-viewer,
.error-card,
.loading-card {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(14, 30, 48, 0.82), rgba(8, 18, 32, 0.88));
  border-radius: var(--radius-lg);
}

.metric-card {
  padding: 16px;
}

.metric-card strong {
  display: block;
  font-size: 1.4rem;
  margin-bottom: 6px;
}

.hero-visual {
  display: flex;
  align-items: stretch;
}

.signal-panel {
  position: relative;
  flex: 1;
  min-height: 420px;
  border-radius: calc(var(--radius-xl) - 4px);
  overflow: hidden;
  border: 1px solid var(--line);
  background:
    radial-gradient(circle at center, rgba(92, 210, 255, 0.14), transparent 34%),
    linear-gradient(180deg, rgba(14, 30, 52, 0.95), rgba(8, 16, 28, 0.95));
}

.signal-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 1), transparent);
}

.signal-wave {
  position: absolute;
  left: 8%;
  right: 8%;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  box-shadow: 0 0 28px rgba(92, 210, 255, 0.42);
  animation: drift 8s ease-in-out infinite;
}

.signal-wave-a {
  top: 28%;
}

.signal-wave-b {
  top: 50%;
  animation-delay: -2s;
}

.signal-wave-c {
  top: 72%;
  animation-delay: -4s;
}

.signal-status {
  position: absolute;
  left: 24px;
  right: 24px;
  bottom: 24px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.78rem;
}

.section-header {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 18px;
  margin-bottom: 24px;
  align-items: end;
}

.section-kicker {
  margin: 0 0 8px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.78rem;
}

.section h2,
.footer-cta h2 {
  margin: 0 0 10px;
  font-size: clamp(1.9rem, 4vw, 3.2rem);
  line-height: 1;
  max-width: 15ch;
}

.section-description,
.footer-cta p {
  max-width: 70ch;
  line-height: 1.7;
}

.card-grid,
.pillar-grid,
.workflow-grid,
.docs-portal,
.architecture-grid {
  display: grid;
  gap: 16px;
}

.card-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.feature-card,
.doc-card,
.arch-card,
.workflow-card,
.lane-card {
  padding: 18px;
}

.feature-head,
.workflow-head,
.detail-head,
.console-head,
.seed-list-head,
.contract-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.feature-card h3,
.workflow-card h4,
.lane-card h4,
.doc-card h3,
.arch-card h3,
.faq-item summary,
.seed-card h5,
.studio-story h3 {
  margin: 0;
}

.feature-card p,
.workflow-card p,
.lane-card p,
.doc-card p,
.arch-card li,
.faq-item p,
.seed-card p,
.studio-story p,
.pillar-card p {
  line-height: 1.65;
}

.feature-card dl,
.detail-grid {
  display: grid;
  gap: 14px;
  margin: 18px 0 0;
}

.feature-card dd,
.feature-card dt,
.detail-grid dt,
.detail-grid dd {
  margin: 0;
}

.feature-card dt,
.detail-grid dt {
  margin-bottom: 4px;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.studio-layout,
.matrix-layout,
.architecture-layout,
.contracts-layout,
.footer-cta {
  display: grid;
  gap: 18px;
}

.studio-layout,
.matrix-layout,
.architecture-layout {
  grid-template-columns: 1.05fr 0.95fr;
}

.studio-story,
.seed-list,
.matrix-detail,
.lane-card {
  display: grid;
  gap: 16px;
}

.studio-assets {
  display: grid;
  gap: 16px;
}

.image-card {
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(10, 20, 34, 0.88), rgba(9, 16, 26, 0.96));
}

.seed-list {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(7, 17, 31, 0.72);
}

.seed-card {
  padding: 16px;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag-row span {
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.8rem;
}

.matrix-list {
  display: grid;
  gap: 12px;
}

.route-card {
  padding: 18px;
  text-align: left;
  cursor: pointer;
}

.route-card.active {
  border-color: var(--line-strong);
  background: linear-gradient(180deg, rgba(21, 43, 66, 0.92), rgba(10, 20, 34, 0.92));
}

.matrix-detail {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(8, 18, 32, 0.72);
}

.matrix-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.94rem;
}

.matrix-table th,
.matrix-table td {
  padding: 12px 10px;
  text-align: left;
  border-top: 1px solid var(--line);
  vertical-align: top;
}

.workflow-stack {
  display: grid;
  gap: 20px;
}

.demo-workbench {
  display: grid;
  gap: 16px;
}

.demo-console {
  padding: 18px;
}

.console-body code {
  display: inline-flex;
  margin-top: 10px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(92, 210, 255, 0.1);
  color: var(--accent-strong);
}

.console-body.muted {
  color: var(--muted);
}

.lane-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.lane-card {
  align-content: start;
}

.lane-card article {
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.docs-portal {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.doc-card:hover {
  transform: translateY(-2px);
  border-color: var(--line-strong);
}

.architecture-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.arch-card ul {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
}

.contracts-layout {
  grid-template-columns: 280px 1fr;
}

.contract-tabs {
  display: grid;
  gap: 10px;
}

.contract-tab {
  min-height: 56px;
  padding: 0 16px;
  text-align: left;
  color: var(--text);
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(9, 20, 34, 0.7);
  cursor: pointer;
}

.contract-tab.active {
  border-color: var(--line-strong);
  background: rgba(18, 37, 58, 0.92);
}

.contract-viewer {
  padding: 18px;
}

.contract-viewer pre {
  margin: 14px 0 0;
  padding: 18px;
  overflow: auto;
  border-radius: 18px;
  background: rgba(4, 10, 18, 0.86);
  border: 1px solid rgba(132, 255, 225, 0.1);
  color: #d5f2ff;
  font-size: 0.9rem;
  line-height: 1.55;
}

.faq-list {
  display: grid;
  gap: 14px;
}

.faq-item {
  padding: 18px;
}

.faq-item summary {
  cursor: pointer;
  list-style: none;
  font-weight: 600;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item p {
  margin: 14px 0 0;
}

.footer-cta {
  grid-template-columns: 1fr auto;
  align-items: center;
}

.error-card,
.loading-card {
  padding: 28px;
  max-width: 680px;
}

@keyframes drift {
  0%,
  100% {
    transform: translateY(0) scaleX(0.92);
    opacity: 0.35;
  }
  50% {
    transform: translateY(-14px) scaleX(1);
    opacity: 1;
  }
}

@media (max-width: 1100px) {
  .topnav,
  .hero,
  .studio-layout,
  .matrix-layout,
  .architecture-layout,
  .contracts-layout,
  .footer-cta {
    grid-template-columns: 1fr;
  }

  .topnav {
    position: static;
  }

  .card-grid,
  .docs-portal,
  .architecture-grid,
  .lane-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .app-shell {
    width: min(100vw - 20px, var(--shell));
    padding-top: 10px;
  }

  .topnav,
  .section,
  .footer-cta,
  .hero {
    padding: 18px;
  }

  .hero-metrics,
  .card-grid,
  .docs-portal,
  .architecture-grid,
  .lane-grid {
    grid-template-columns: 1fr;
  }

  .section-header {
    grid-template-columns: 1fr;
  }

  .signal-panel {
    min-height: 280px;
  }

  .primary-nav {
    justify-content: flex-start;
  }

  .nav-meta {
    justify-content: flex-start;
  }
}