.top {
  position: sticky;
  top: 0;
  z-index: 120;
  backdrop-filter: blur(18px);
  background: rgba(251, 248, 243, 0.76);
  border-bottom: 1px solid rgba(18, 16, 13, 0.06);
  box-shadow: 0 8px 24px rgba(17, 21, 28, 0.025);
}

.top-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: var(--top-h);
}

.marchai-brand {
  display: inline-flex;
  align-items: center;
  gap: 18px;
  flex: 0 0 auto;
}

.marchai-brand:hover {
  text-decoration: none;
}

.marchai-brand__mark {
  width: 48px;
  height: 48px;
}

.marchai-brand__name {
  font-family: var(--font-brand);
  font-size: 1.5rem;
  font-weight: 500;
  letter-spacing: 0.34em;
}

.nav {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-left: auto;
  margin-right: 10px;
  color: rgba(17, 17, 17, 0.72);
  font-size: 0.95rem;
}

.nav a {
  position: relative;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -8px;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 220ms var(--ease);
}

.nav a:hover::after,
.nav a.is-active::after {
  transform: scaleX(1);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 54px;
  padding: 0 24px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition:
    transform 180ms var(--ease),
    border-color 180ms var(--ease),
    background-color 180ms var(--ease),
    color 180ms var(--ease),
    box-shadow 180ms var(--ease);
  font-weight: 500;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-primary {
  background: #12100d;
  color: #fbf8f3;
  box-shadow: 0 20px 34px rgba(18, 16, 13, 0.14);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.8);
  border-color: rgba(18, 16, 13, 0.12);
  color: #12100d;
}

.hero {
  padding: 112px 0 52px;
  background:
    radial-gradient(circle at 50% 0%, rgba(180, 131, 61, 0.12), transparent 30%),
    radial-gradient(circle at 100% 100%, rgba(17, 21, 28, 0.05), transparent 26%),
    linear-gradient(180deg, rgba(255, 252, 246, 0.97), rgba(246, 242, 234, 0.99));
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(255, 255, 255, 0.46), transparent 38%),
    radial-gradient(circle at 78% 18%, rgba(180, 131, 61, 0.08), transparent 18%);
  pointer-events: none;
}

.hero-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  gap: 52px;
  align-items: center;
}

.hero-copy {
  max-width: 33rem;
  text-align: left;
  position: relative;
  z-index: 1;
}

.hero-title {
  margin: 0;
  max-width: 7.8ch;
  font-family: var(--font-serif);
  font-size: clamp(3.6rem, 6.3vw, 6.1rem);
  line-height: 0.94;
  letter-spacing: -0.06em;
}

.hero-subtitle {
  margin: 22px 0 0;
  max-width: 35rem;
  font-size: clamp(1.12rem, 1.72vw, 1.26rem);
  line-height: 1.72;
  color: rgba(18, 16, 13, 0.72);
}

.hero-meter {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 28px;
}

.hero-meter__item {
  min-height: 112px;
  padding: 16px 16px 14px;
  border-radius: 24px;
  border: 1px solid rgba(18, 16, 13, 0.08);
  background:
    radial-gradient(circle at 16% 14%, rgba(180, 131, 61, 0.08), transparent 22%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.82), rgba(249, 243, 235, 0.82));
  box-shadow:
    0 16px 32px rgba(17, 21, 28, 0.045),
    inset 0 1px 0 rgba(255, 255, 255, 0.68);
}

.hero-meter__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(18, 16, 13, 0.46);
}

.hero-meter__item strong {
  display: block;
  margin-top: 10px;
  font-size: 0.98rem;
  line-height: 1.42;
  color: rgba(18, 16, 13, 0.9);
}

.hero-highlights {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.hero-highlights span {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 0 16px;
  border-radius: 999px;
  border: 1px solid rgba(18, 16, 13, 0.08);
  background: rgba(255, 255, 255, 0.72);
  color: rgba(18, 16, 13, 0.68);
  font-size: 0.94rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.hero-stage,
.problem-visual,
.surface-stage,
.story-panel,
.cta-panel,
.trust-card {
  border-radius: 40px;
  border: 1px solid rgba(18, 16, 13, 0.08);
  box-shadow: 0 36px 90px rgba(18, 16, 13, 0.08);
}

.hero-stage {
  margin-top: 0;
  padding: 34px 34px 24px;
  background:
    radial-gradient(circle at 16% 14%, rgba(180, 131, 61, 0.16), transparent 22%),
    radial-gradient(circle at 86% 86%, rgba(17, 21, 28, 0.08), transparent 24%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.99), rgba(243, 236, 227, 0.99));
  position: relative;
  overflow: hidden;
  min-height: 620px;
  display: grid;
  align-content: space-between;
}

.hero-stage::before {
  content: "";
  position: absolute;
  inset: 18px;
  border-radius: 30px;
  border: 1px solid rgba(18, 16, 13, 0.06);
  pointer-events: none;
}

.hero-stage > .diagram {
  position: relative;
  z-index: 1;
}

.hero-stage::after {
  content: "";
  position: absolute;
  inset: auto 8% 6% 8%;
  height: 148px;
  background: radial-gradient(circle at center, rgba(18, 16, 13, 0.16), transparent 72%);
  filter: blur(34px);
  pointer-events: none;
}

.hero-stage__label {
  position: absolute;
  top: 20px;
  left: 24px;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid rgba(18, 16, 13, 0.08);
  background: rgba(255, 255, 255, 0.72);
  color: rgba(18, 16, 13, 0.54);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  backdrop-filter: blur(12px);
}

.diagram-hero {
  transform: scale(1.02);
  transform-origin: center;
  margin-top: 28px;
}

.diagram {
  width: 100%;
  height: auto;
  display: block;
}

.hero-stage__legend {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: -8px;
}

.hero-stage__legend-card {
  min-height: 102px;
  padding: 16px 18px 14px;
  border-radius: 22px;
  border: 1px solid rgba(18, 16, 13, 0.08);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.76), rgba(247, 240, 231, 0.78));
  box-shadow:
    0 18px 34px rgba(17, 21, 28, 0.06),
    inset 0 1px 0 rgba(255, 255, 255, 0.76);
  backdrop-filter: blur(12px);
}

.hero-stage__legend-card span {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(18, 16, 13, 0.44);
}

.hero-stage__legend-card strong {
  display: block;
  margin-top: 10px;
  font-size: 1rem;
  line-height: 1.42;
  color: rgba(18, 16, 13, 0.92);
}

.section {
  padding: 124px 0;
}

.proof-strip {
  padding: 34px 0 14px;
  background:
    radial-gradient(circle at 0% 0%, rgba(180, 131, 61, 0.06), transparent 18%),
    linear-gradient(180deg, rgba(246, 242, 234, 0.99), #fbf8f3);
}

.proof-strip__inner {
  display: grid;
  gap: 28px;
}

.proof-strip__intro {
  max-width: 44rem;
}

.proof-strip__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.proof-card {
  margin: 0;
  padding: 22px;
  border-radius: 30px;
  border: 1px solid rgba(18, 16, 13, 0.08);
  background:
    radial-gradient(circle at 14% 16%, rgba(180, 131, 61, 0.08), transparent 18%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(247, 241, 232, 0.92));
  box-shadow: 0 30px 68px rgba(18, 16, 13, 0.08);
  position: relative;
  overflow: hidden;
}

.proof-card::before {
  content: "";
  position: absolute;
  left: 20px;
  right: 20px;
  top: 0;
  height: 3px;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(180, 131, 61, 0.88), rgba(180, 131, 61, 0.1));
}

.proof-card__frame {
  overflow: hidden;
  border-radius: 20px;
  border: 1px solid rgba(18, 16, 13, 0.08);
  background:
    radial-gradient(circle at top left, rgba(180, 131, 61, 0.14), transparent 22%),
    linear-gradient(180deg, #0d1219, #111824);
  min-height: 240px;
  padding: 10px;
  position: relative;
}

.proof-card__frame::before {
  content: "";
  position: absolute;
  inset: 10px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  pointer-events: none;
}

.proof-card__frame img,
.proof-card__frame .diagram {
  display: block;
  width: 100%;
  height: auto;
}

.proof-card__frame .diagram {
  filter: drop-shadow(0 18px 34px rgba(0, 0, 0, 0.18));
}

.proof-card figcaption {
  margin-top: 14px;
  display: grid;
  gap: 8px;
}

.proof-card figcaption strong {
  font-size: 1rem;
}

.proof-card figcaption span {
  color: rgba(18, 16, 13, 0.68);
  line-height: 1.6;
}

.section--problem {
  padding-top: 88px;
}

.section--surfaces {
  background: #ffffff;
}

.section--examples {
  background: linear-gradient(180deg, #f3eee6, #fbf8f3);
}

.section--trust {
  background: linear-gradient(180deg, #0a1119, #101721);
  color: #f7efe2;
}

.section--deck {
  background:
    radial-gradient(circle at 88% 10%, rgba(180, 131, 61, 0.16), transparent 24%),
    radial-gradient(circle at 12% 88%, rgba(98, 124, 158, 0.1), transparent 28%),
    linear-gradient(180deg, #091018, #0b1119 42%, #0d131d 100%);
  color: #f7efe2;
}

.section--cta {
  padding-top: 76px;
}

.eyebrow,
.story-panel__tag,
.story-card__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(18, 16, 13, 0.48);
}

.eyebrow--light {
  color: rgba(247, 239, 226, 0.56);
}

.section-title,
.story-panel__copy h3,
.cta-title,
.trust-card h3 {
  margin: 12px 0 0;
  font-family: var(--font-serif);
  line-height: 0.98;
  letter-spacing: -0.04em;
}

.section-title,
.cta-title {
  font-size: clamp(2.8rem, 5vw, 4.8rem);
}

.section-title--compact {
  font-size: clamp(2.2rem, 4.2vw, 3.6rem);
}

.section-title--light {
  color: #f7efe2;
}

.section-copy,
.story-panel__copy p,
.cta-copy,
.trust-card p {
  margin: 16px 0 0;
  color: rgba(18, 16, 13, 0.72);
  line-height: 1.76;
  font-size: 1.05rem;
}

.section-copy--wide {
  max-width: 52rem;
  margin-left: auto;
  margin-right: auto;
}

.section-copy--light {
  color: rgba(247, 239, 226, 0.76);
}

.section-intro,
.cta-wrap {
  text-align: center;
}

.problem-grid,
.trust-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
  gap: 44px;
  align-items: center;
}

.problem-visual,
.surface-stage {
  padding: 26px;
  background:
    radial-gradient(circle at top left, rgba(180, 131, 61, 0.1), transparent 30%),
    linear-gradient(180deg, rgba(255, 252, 246, 0.985), rgba(242, 236, 227, 0.98));
  position: relative;
  overflow: hidden;
}

.problem-visual::before,
.surface-stage::before {
  content: "";
  position: absolute;
  inset: 16px;
  border-radius: 30px;
  border: 1px solid rgba(18, 16, 13, 0.06);
  pointer-events: none;
}

.problem-visual::after,
.surface-stage::after {
  content: "";
  position: absolute;
  inset: auto 10% 3% 10%;
  height: 96px;
  background: radial-gradient(circle at center, rgba(18, 16, 13, 0.12), transparent 72%);
  filter: blur(24px);
  pointer-events: none;
}

.surface-stage {
  margin-top: 48px;
}

.workflow-steps {
  margin-top: 34px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.workflow-step {
  padding: 24px 22px;
  border-radius: 26px;
  border: 1px solid rgba(18, 16, 13, 0.08);
  background: rgba(255, 255, 255, 0.78);
  box-shadow: 0 18px 44px rgba(18, 16, 13, 0.05);
  position: relative;
  overflow: hidden;
}

.workflow-step::before {
  content: "";
  position: absolute;
  left: 20px;
  right: 20px;
  top: 0;
  height: 3px;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(180, 131, 61, 0.88), rgba(216, 169, 104, 0.2));
}

.workflow-step__index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 999px;
  background: #12100d;
  color: #fbf8f3;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
}

.workflow-step h3 {
  margin: 18px 0 0;
  font-family: var(--font-serif);
  font-size: 1.6rem;
  line-height: 1;
  letter-spacing: -0.03em;
}

.workflow-step p {
  margin: 12px 0 0;
  color: rgba(18, 16, 13, 0.72);
  line-height: 1.68;
}

.autodune-feature {
  margin-top: 44px;
  padding: 34px;
  display: grid;
  gap: 24px;
  border-radius: 38px;
  border: 1px solid rgba(18, 16, 13, 0.08);
  background:
    radial-gradient(circle at top right, rgba(180, 131, 61, 0.12), transparent 22%),
    rgba(255, 255, 255, 0.8);
  box-shadow: 0 24px 58px rgba(18, 16, 13, 0.06);
  position: relative;
  overflow: hidden;
}

.autodune-feature::before {
  content: "";
  position: absolute;
  inset: 16px;
  border-radius: 28px;
  border: 1px solid rgba(18, 16, 13, 0.06);
  pointer-events: none;
}

.autodune-feature::after {
  content: "";
  position: absolute;
  top: -80px;
  right: -40px;
  width: 280px;
  height: 220px;
  background: radial-gradient(circle at center, rgba(180, 131, 61, 0.16), transparent 70%);
  pointer-events: none;
}

.autodune-feature__copy {
  max-width: 50rem;
}

.autodune-feature__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.autodune-feature__card {
  padding: 22px;
  border-radius: 24px;
  border: 1px solid rgba(18, 16, 13, 0.08);
  background: linear-gradient(180deg, rgba(255, 252, 246, 0.96), rgba(245, 236, 224, 0.92));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.7);
}

.autodune-feature__card h3 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.65rem;
  line-height: 1;
  letter-spacing: -0.03em;
}

.autodune-feature__card p {
  margin: 12px 0 0;
  color: rgba(18, 16, 13, 0.72);
  line-height: 1.68;
}

.story-stack {
  display: grid;
  gap: 28px;
  margin-top: 48px;
}

.story-panel {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 28px;
  align-items: center;
  padding: 34px;
  background: rgba(255, 252, 246, 0.92);
  position: relative;
  overflow: hidden;
}

.story-panel::before {
  content: "";
  position: absolute;
  inset: 16px;
  border-radius: 30px;
  border: 1px solid rgba(18, 16, 13, 0.06);
  pointer-events: none;
}

.story-panel--dark {
  background: linear-gradient(180deg, #171f2a, #101721);
  border-color: rgba(217, 201, 176, 0.12);
  color: #f7efe2;
}

.story-panel__copy h3 {
  font-size: clamp(2rem, 3.6vw, 3.1rem);
  max-width: 14ch;
}

.story-panel--dark p,
.story-panel--dark .story-panel__tag {
  color: rgba(247, 239, 226, 0.76);
}

.trust-copy .section-title,
.trust-copy .section-copy,
.trust-copy .eyebrow {
  color: #f7efe2;
}

.trust-points {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.trust-card {
  padding: 26px;
  background: rgba(247, 239, 226, 0.05);
  border-color: rgba(247, 239, 226, 0.12);
  position: relative;
  overflow: hidden;
}

.trust-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  bottom: 24px;
  width: 2px;
  background: linear-gradient(180deg, rgba(180, 131, 61, 0.8), rgba(180, 131, 61, 0.1));
}

.trust-card p {
  color: rgba(247, 239, 226, 0.74);
}

.cta-panel {
  padding: 48px 34px;
  background: linear-gradient(180deg, rgba(255, 252, 246, 0.98), rgba(244, 236, 226, 0.98));
}

.deck-home {
  display: grid;
  gap: 34px;
}

.deck-home__intro {
  max-width: 52rem;
}

.deck-panels {
  display: grid;
  gap: 24px;
}

.deck-panel {
  display: grid;
  grid-template-columns: minmax(0, 0.84fr) minmax(0, 1.16fr);
  gap: 28px;
  padding: 34px;
  border-radius: 34px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  position: relative;
  overflow: hidden;
}

.deck-panel::before {
  content: "";
  position: absolute;
  inset: 16px;
  border-radius: 24px;
  border: 1px solid rgba(255, 255, 255, 0.06);
  pointer-events: none;
}

.deck-panel--dark {
  background:
    radial-gradient(circle at 14% 16%, rgba(180, 131, 61, 0.1), transparent 20%),
    radial-gradient(circle at 84% 84%, rgba(98, 124, 158, 0.08), transparent 24%),
    linear-gradient(180deg, rgba(247, 241, 232, 0.055), rgba(247, 241, 232, 0.03));
  border-color: rgba(58, 70, 91, 0.78);
  box-shadow:
    0 36px 96px rgba(3, 6, 10, 0.32),
    inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.deck-panel--light {
  background:
    radial-gradient(circle at 12% 16%, rgba(180, 131, 61, 0.08), transparent 20%),
    linear-gradient(180deg, rgba(255, 253, 249, 0.98), rgba(247, 239, 229, 0.96));
  border-color: rgba(205, 193, 178, 0.92);
  box-shadow:
    0 30px 74px rgba(15, 20, 28, 0.08),
    inset 0 1px 0 rgba(255, 255, 255, 0.76);
}

.deck-panel__copy,
.deck-panel__visual {
  position: relative;
  z-index: 1;
}

.deck-panel__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(247, 239, 226, 0.56);
}

.deck-panel--light .deck-panel__tag {
  color: rgba(18, 16, 13, 0.46);
}

.deck-panel__copy h3 {
  margin: 12px 0 0;
  font-family: var(--font-serif);
  font-size: clamp(2rem, 3.8vw, 3.15rem);
  line-height: 1;
  letter-spacing: -0.04em;
  color: #f7efe2;
}

.deck-panel--light .deck-panel__copy h3 {
  color: #12100d;
}

.deck-panel__copy p {
  margin: 16px 0 0;
  color: rgba(247, 239, 226, 0.76);
  line-height: 1.76;
  font-size: 1.03rem;
}

.deck-panel--light .deck-panel__copy p {
  color: rgba(18, 16, 13, 0.72);
}

.deck-panel__facts {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.deck-panel__facts li {
  padding: 14px 16px;
  border-radius: 18px;
  border: 1px solid rgba(247, 239, 226, 0.12);
  background: rgba(247, 239, 226, 0.04);
  color: rgba(247, 239, 226, 0.82);
}

.deck-panel--light .deck-panel__facts li {
  border-color: rgba(18, 16, 13, 0.08);
  background: rgba(255, 255, 255, 0.72);
  color: rgba(18, 16, 13, 0.82);
}

.deck-panel__visual {
  display: grid;
  align-content: center;
  min-height: 360px;
  padding: 24px;
  border-radius: 28px;
  background:
    radial-gradient(circle at 16% 16%, rgba(180, 131, 61, 0.1), transparent 18%),
    linear-gradient(180deg, rgba(15, 21, 32, 0.96), rgba(9, 14, 22, 0.96));
  border: 1px solid rgba(58, 70, 91, 0.84);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.04),
    0 24px 58px rgba(6, 10, 14, 0.22);
}

.deck-panel--light .deck-panel__visual {
  background:
    radial-gradient(circle at 16% 16%, rgba(180, 131, 61, 0.08), transparent 18%),
    linear-gradient(180deg, rgba(255, 253, 249, 0.98), rgba(244, 236, 226, 0.96));
  border-color: rgba(205, 193, 178, 0.92);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.76),
    0 24px 58px rgba(15, 20, 28, 0.08);
}

.deck-panel__visual .diagram {
  filter: drop-shadow(0 14px 26px rgba(9, 13, 18, 0.14));
}

.deck-panel__visual--stack {
  gap: 18px;
}

@media (max-width: 1120px) {
  .hero-layout,
  .proof-strip__grid,
  .problem-grid,
  .trust-grid,
  .story-panel,
  .autodune-feature__grid,
  .workflow-steps {
    grid-template-columns: 1fr;
  }

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

  .hero-meter,
  .hero-stage__legend {
    grid-template-columns: 1fr;
  }

  .deck-panel {
    grid-template-columns: 1fr;
    gap: 22px;
  }

  .deck-panel__visual {
    min-height: 300px;
  }
}

@media (max-width: 820px) {
  .nav {
    display: none;
  }

  .hero {
    padding-top: 92px;
  }

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

  .hero-title,
  .hero-subtitle {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-highlights,
  .hero-actions {
    justify-content: center;
  }

  .hero-meter {
    margin-left: auto;
    margin-right: auto;
    max-width: 36rem;
  }

  .section {
    padding: 96px 0;
  }

  .proof-strip {
    padding-top: 18px;
  }

  .hero-stage,
  .problem-visual,
  .surface-stage,
  .autodune-feature,
  .story-panel,
  .cta-panel,
  .trust-card,
  .deck-panel,
  .deck-panel__visual {
    border-radius: 28px;
  }

  .deck-panel {
    padding: 26px;
  }
}

@media (max-width: 640px) {
  .top-inner {
    min-height: auto;
    padding-top: 12px;
    padding-bottom: 12px;
    flex-wrap: wrap;
  }

  .marchai-brand {
    gap: 14px;
  }

  .marchai-brand__mark {
    width: 42px;
    height: 42px;
  }

  .marchai-brand__name {
    font-size: 1.32rem;
    letter-spacing: 0.28em;
  }

  .btn {
    min-height: 50px;
    width: 100%;
  }

  .hero-stage,
  .proof-card,
  .problem-visual,
  .surface-stage,
  .autodune-feature,
  .story-panel,
  .cta-panel,
  .trust-card,
  .deck-panel,
  .deck-panel__visual {
    padding: 22px 18px;
  }

  .hero-highlights {
    align-items: stretch;
  }

  .hero-highlights span {
    width: 100%;
    justify-content: center;
  }

  .hero-stage__label {
    top: 16px;
    left: 18px;
  }

  .trust-points {
    grid-template-columns: 1fr;
  }

  .deck-panel__copy h3 {
    font-size: clamp(1.7rem, 8vw, 2.35rem);
  }

  .deck-panel__visual {
    min-height: 240px;
  }

  .diagram text {
    font-size: 12px;
  }
}

.autodune-strip {
  margin-top: 36px;
  padding: 28px 30px;
  display: grid;
  grid-template-columns: minmax(0, 0.72fr) minmax(0, 1.28fr);
  gap: 22px;
  border-radius: 32px;
  border: 1px solid rgba(18, 16, 13, 0.08);
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 24px 56px rgba(18, 16, 13, 0.06);
  position: relative;
  overflow: hidden;
}

.autodune-strip::before {
  content: "";
  position: absolute;
  inset: 14px;
  border-radius: 24px;
  border: 1px solid rgba(18, 16, 13, 0.06);
  pointer-events: none;
}

.autodune-strip__intro h3 {
  margin: 12px 0 0;
  font-family: var(--font-serif);
  font-size: clamp(1.7rem, 3vw, 2.5rem);
  line-height: 1.02;
  letter-spacing: -0.04em;
  max-width: 14ch;
}

.autodune-strip__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.autodune-pill {
  padding: 18px 18px 16px;
  border-radius: 22px;
  border: 1px solid rgba(18, 16, 13, 0.08);
  background: linear-gradient(180deg, rgba(255, 252, 246, 0.98), rgba(245, 236, 224, 0.98));
}

.autodune-pill strong {
  display: block;
  font-size: 1rem;
  font-weight: 600;
  color: #12100d;
}

.autodune-pill span {
  display: block;
  margin-top: 8px;
  color: rgba(18, 16, 13, 0.72);
  line-height: 1.6;
  font-size: 0.95rem;
}

.usecase-explorer {
  margin-top: 56px;
  display: grid;
  gap: 26px;
}

.usecase-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
}

.usecase-head__copy {
  max-width: 54rem;
}

.usecase-head__title {
  margin: 12px 0 0;
  font-family: var(--font-serif);
  font-size: clamp(2.05rem, 3.9vw, 3.5rem);
  line-height: 0.98;
  letter-spacing: -0.04em;
}

.usecase-head__lede {
  margin: 14px 0 0;
  max-width: 48rem;
  color: rgba(18, 16, 13, 0.84);
  line-height: 1.72;
  font-size: 1.04rem;
}

.usecase-head__meta {
  display: inline-flex;
  align-items: center;
  gap: 18px;
  flex: 0 0 auto;
}

.usecase-progress {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  min-width: 88px;
  font-family: var(--font-mono);
  color: rgba(18, 16, 13, 0.72);
}

.usecase-progress__current {
  font-size: 1.32rem;
  color: #12100d;
}

.usecase-progress__divider,
.usecase-progress__total {
  font-size: 0.94rem;
}

.usecase-arrows {
  display: inline-flex;
  gap: 10px;
}

.usecase-arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 64px;
  min-height: 44px;
  padding: 0 16px;
  border-radius: 999px;
  border: 1px solid rgba(18, 16, 13, 0.12);
  background: rgba(255, 255, 255, 0.84);
  color: rgba(18, 16, 13, 0.82);
  font: inherit;
  cursor: pointer;
  transition:
    transform 180ms var(--ease),
    background-color 180ms var(--ease),
    border-color 180ms var(--ease),
    color 180ms var(--ease);
}

.usecase-arrow:hover:not(:disabled) {
  transform: translateY(-1px);
}

.usecase-arrow:disabled {
  opacity: 0.42;
  cursor: default;
}

.usecase-nav {
  display: flex;
  gap: 12px;
  flex-wrap: nowrap;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: none;
}

.usecase-nav::-webkit-scrollbar {
  display: none;
}

.usecase-nav__button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  min-height: 48px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid rgba(18, 16, 13, 0.12);
  background: rgba(255, 255, 255, 0.84);
  color: rgba(18, 16, 13, 0.82);
  font: inherit;
  cursor: pointer;
  transition:
    background-color 180ms var(--ease),
    border-color 180ms var(--ease),
    color 180ms var(--ease),
    transform 180ms var(--ease),
    box-shadow 180ms var(--ease);
}

.usecase-nav__button:hover {
  transform: translateY(-1px);
}

.usecase-nav__button.is-active,
.usecase-nav__button[aria-selected="true"] {
  background: #12100d;
  border-color: #12100d;
  color: #fbf8f3;
  box-shadow: 0 14px 30px rgba(18, 16, 13, 0.14);
}

.usecase-progressbar {
  position: relative;
  height: 4px;
  border-radius: 999px;
  background: rgba(18, 16, 13, 0.09);
  overflow: hidden;
}

.usecase-progressbar__fill {
  display: block;
  width: calc(100% / 12);
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #b4833d, #d8a968);
  transition: width 420ms var(--ease);
}

.usecase-stage {
  position: relative;
  overflow: hidden;
  border-radius: 44px;
  border: 1px solid rgba(18, 16, 13, 0.08);
  background:
    radial-gradient(circle at top left, rgba(212, 183, 138, 0.18), transparent 32%),
    radial-gradient(circle at bottom right, rgba(28, 43, 60, 0.1), transparent 28%),
    linear-gradient(180deg, rgba(255, 252, 246, 0.985), rgba(241, 234, 224, 0.985));
  box-shadow: 0 44px 106px rgba(18, 16, 13, 0.1);
  transition: height 420ms var(--ease);
  min-height: 820px;
}

.usecase-stage::before {
  content: "";
  position: absolute;
  inset: 18px;
  border-radius: 34px;
  border: 1px solid rgba(18, 16, 13, 0.06);
  pointer-events: none;
}

.usecase-stage::after {
  content: "";
  position: absolute;
  inset: auto 6% 0 6%;
  height: 136px;
  background: radial-gradient(circle at center, rgba(18, 16, 13, 0.14), transparent 70%);
  filter: blur(30px);
  pointer-events: none;
}

.usecase-track {
  display: flex;
  align-items: stretch;
  transition: transform 520ms cubic-bezier(0.22, 0.61, 0.36, 1);
  will-change: transform;
}

.usecase-scene {
  flex: 0 0 100%;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: 38px;
  align-items: center;
  padding: 44px 44px 50px;
}

.usecase-scene--dark {
  color: #f7efe2;
}

.usecase-scene--dark h3 {
  color: #fff7eb;
}

.usecase-scene__story {
  align-self: start;
}

.usecase-scene__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: rgba(18, 16, 13, 0.48);
}

.usecase-scene--dark .usecase-scene__tag {
  color: rgba(247, 239, 226, 0.62);
}

.usecase-scene__story h3 {
  margin: 12px 0 0;
  font-family: var(--font-serif);
  font-size: clamp(2.1rem, 3.8vw, 3.35rem);
  line-height: 0.98;
  letter-spacing: -0.04em;
  max-width: 14.5ch;
}

.usecase-scene__summary {
  margin: 18px 0 0;
  color: rgba(18, 16, 13, 0.86);
  line-height: 1.76;
  font-size: 1.05rem;
}

.usecase-scene--dark .usecase-scene__summary {
  color: rgba(247, 239, 226, 0.9);
}

.usecase-scene__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 24px;
}

.usecase-fact {
  padding: 16px 18px;
  border-radius: 22px;
  border: 1px solid rgba(18, 16, 13, 0.08);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.74), rgba(248, 242, 233, 0.68));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.76);
}

.usecase-scene--dark .usecase-fact {
  border-color: rgba(247, 239, 226, 0.1);
  background: rgba(247, 239, 226, 0.05);
}

.usecase-fact__label {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(18, 16, 13, 0.64);
}

.usecase-scene--dark .usecase-fact__label {
  color: rgba(247, 239, 226, 0.72);
}

.usecase-fact__value {
  display: block;
  color: #12100d;
  line-height: 1.55;
  font-size: 0.98rem;
  font-weight: 600;
}

.usecase-scene--dark .usecase-fact__value {
  color: #f7efe2;
}

.usecase-scene__outcomes {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.usecase-scene__outcomes li {
  position: relative;
  padding-left: 22px;
  color: rgba(18, 16, 13, 0.9);
  line-height: 1.68;
}

.usecase-scene--dark .usecase-scene__outcomes li {
  color: rgba(247, 239, 226, 0.92);
}

.usecase-scene__outcomes li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
}

.usecase-scene__visual {
  padding: 20px;
  border-radius: 32px;
  border: 1px solid rgba(18, 16, 13, 0.08);
  background:
    radial-gradient(circle at top left, rgba(180, 131, 61, 0.12), transparent 22%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(248, 242, 233, 0.92));
  position: relative;
  overflow: hidden;
  min-height: 438px;
}

.usecase-scene__visual::before {
  content: "";
  position: absolute;
  inset: 12px;
  border-radius: 24px;
  border: 1px solid rgba(18, 16, 13, 0.06);
  pointer-events: none;
}

.usecase-scene__visual::after {
  content: "";
  position: absolute;
  inset: auto 10% 3% 10%;
  height: 98px;
  background: radial-gradient(circle at center, rgba(18, 16, 13, 0.12), transparent 72%);
  filter: blur(22px);
  pointer-events: none;
}

.usecase-scene__visual .diagram {
  position: relative;
  z-index: 1;
  filter: drop-shadow(0 22px 38px rgba(18, 16, 13, 0.12));
  transform: scale(1.015);
  transform-origin: center;
}

.usecase-scene__visual .diagram .diagram-panel {
  fill: #fffaf4;
  stroke: #d8cab3;
  stroke-width: 2;
}

.usecase-scene__visual .diagram .diagram-panel--dark {
  fill: #11151c;
  stroke: #11151c;
}

.usecase-scene__visual .diagram .diagram-card {
  stroke-width: 1.8;
}

.usecase-scene__visual .diagram .diagram-card--accent {
  fill: #f5e6d1;
  stroke: #c79a56;
}

.usecase-scene__visual .diagram .diagram-card--soft {
  fill: #f7efe4;
  stroke: #ded1bf;
}

.usecase-scene__visual .diagram .diagram-card--dark {
  fill: #27303d;
  stroke: #27303d;
}

.usecase-scene__visual .diagram .diagram-link {
  stroke: rgba(18, 16, 13, 0.18);
  stroke-width: 4;
  stroke-linecap: round;
}

.usecase-scene__visual .diagram .diagram-title {
  fill: #6f624f;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.usecase-scene__visual .diagram .diagram-title--light {
  fill: #ccb38b;
}

.usecase-scene__visual .diagram .diagram-copy {
  fill: #12100d;
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 600;
}

.usecase-scene__visual .diagram .diagram-copy--light {
  fill: #f7efe2;
}

.usecase-scene__visual .diagram .diagram-strip {
  fill: rgba(18, 16, 13, 0.06);
  stroke: rgba(18, 16, 13, 0.08);
  stroke-width: 1.2;
}

.usecase-scene__visual .diagram .diagram-note {
  fill: rgba(18, 16, 13, 0.76);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
}

.usecase-scene--dark .usecase-scene__visual {
  border-color: rgba(247, 239, 226, 0.1);
  background:
    radial-gradient(circle at top left, rgba(180, 131, 61, 0.12), transparent 22%),
    linear-gradient(180deg, rgba(247, 239, 226, 0.08), rgba(247, 239, 226, 0.03));
}

.usecase-scene--dark .usecase-scene__visual::before {
  border-color: rgba(247, 239, 226, 0.08);
}

.usecase-scene--dark .usecase-scene__visual .diagram .diagram-link {
  stroke: rgba(247, 239, 226, 0.16) !important;
}

.usecase-scene--dark .usecase-scene__visual .diagram .diagram-strip {
  fill: rgba(247, 239, 226, 0.12) !important;
  stroke: rgba(247, 239, 226, 0.14) !important;
}

.usecase-scene--dark .usecase-scene__visual .diagram .diagram-note {
  fill: rgba(247, 239, 226, 0.88) !important;
}

.usecase-catalog {
  display: grid;
  gap: 24px;
  margin-top: 10px;
}

.usecase-catalog__intro {
  max-width: 48rem;
}

.usecase-catalog__intro h3 {
  margin: 12px 0 0;
  font-family: var(--font-serif);
  font-size: clamp(1.9rem, 3.3vw, 3rem);
  line-height: 1;
  letter-spacing: -0.04em;
}

.usecase-catalog__intro p:last-child {
  margin: 14px 0 0;
  color: rgba(18, 16, 13, 0.82);
  line-height: 1.72;
}

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

.catalog-card {
  padding: 24px 24px 22px;
  border-radius: 28px;
  border: 1px solid rgba(18, 16, 13, 0.08);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.78), rgba(245, 236, 224, 0.72));
  box-shadow: 0 24px 52px rgba(18, 16, 13, 0.06);
  position: relative;
  overflow: hidden;
}

.catalog-card::before {
  content: "";
  position: absolute;
  left: 24px;
  right: 24px;
  top: 0;
  height: 3px;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(180, 131, 61, 0.84), rgba(180, 131, 61, 0.08));
}

.catalog-card h4 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 1.7rem;
  line-height: 1;
  letter-spacing: -0.03em;
}

.catalog-card p {
  margin: 12px 0 0;
  color: rgba(18, 16, 13, 0.86);
  line-height: 1.68;
}

.catalog-card__autodune {
  display: block;
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid rgba(18, 16, 13, 0.08);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  line-height: 1.6;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(18, 16, 13, 0.68);
}

@media (max-width: 1120px) {
  .autodune-strip {
    grid-template-columns: 1fr;
  }

  .autodune-strip__intro h3 {
    max-width: none;
  }

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

  .usecase-head {
    align-items: stretch;
    flex-direction: column;
  }

  .usecase-head__meta {
    justify-content: space-between;
  }

  .usecase-scene {
    grid-template-columns: 1fr;
  }

  .usecase-catalog__grid {
    grid-template-columns: 1fr;
  }

  .deck-home__intro {
    max-width: none;
  }
}

@media (max-width: 820px) {
  .usecase-stage,
  .usecase-scene {
    border-radius: 28px;
  }
}

@media (max-width: 640px) {
  .usecase-head__meta {
    flex-wrap: wrap;
    gap: 12px;
  }

  .autodune-strip {
    padding: 22px 18px;
  }

  .autodune-strip__grid,
  .usecase-scene__facts {
    grid-template-columns: 1fr;
  }

  .usecase-scene__visual,
  .catalog-card {
    padding: 18px;
  }

  .usecase-progress {
    min-width: auto;
  }

  .usecase-arrow {
    min-width: 54px;
    min-height: 42px;
    padding: 0 14px;
  }

  .usecase-scene {
    padding: 24px 18px 28px;
  }

  .deck-panels {
    gap: 18px;
  }
}