.concept-page {
  --concept-ink: var(--color-text);
  --concept-muted: var(--color-text-muted);
  --concept-paper: var(--color-bg);
  --concept-surface: var(--color-surface);
  --concept-soft: var(--color-bg-elevated);
  --concept-gold: var(--color-primary);
  --concept-gold-text: var(--color-primary-text);
  --concept-blue: var(--color-secondary);
  --concept-green: var(--color-tertiary);
  --concept-danger: var(--color-danger);
  --concept-line: var(--color-border);
  --concept-line-strong: var(--color-border-strong);
  --concept-story-night: var(--concept-ink);
  --concept-story-paper: var(--concept-paper);
  --concept-story-muted: color-mix(in srgb, var(--concept-paper) 70%, transparent);
  --concept-shadow: 0 1.5rem 4rem color-mix(in srgb, var(--concept-ink) 13%, transparent);
  --concept-width: 78rem;
  --concept-font-xs: 0.75rem;
  --concept-font-sm: 0.8125rem;
  --concept-font-base-small: 0.875rem;
  --concept-font-body: 1.05rem;
  --concept-font-copy: 1.075rem;
  --concept-font-lead: 1.1rem;
  --concept-font-lg: 1.125rem;
  --concept-font-xl: 1.25rem;
  --concept-font-card-title: 1.75rem;
  --concept-font-title: clamp(2.65rem, 5vw, 4.65rem);
  --concept-font-heading: clamp(1.85rem, 3.25vw, 3.1rem);
  --concept-font-compare-title: clamp(3rem, 5vw, 4.75rem);
  --concept-font-compare-lead: clamp(1.1rem, 1.65vw, 1.3rem);
  --concept-font-overview-title: clamp(2.8rem, 5vw, 4.8rem);
  --concept-font-overview-heading: clamp(1.9rem, 3.2vw, 3rem);
  --concept-font-story-title: clamp(3.15rem, 6.2vw, 6.2rem);
  --concept-font-story-time: clamp(6rem, 18vw, 17rem);
  --concept-font-story-heading: clamp(2.1rem, 3.8vw, 3.8rem);
  --concept-font-dual-heading: clamp(1.85rem, 3.1vw, 3.05rem);
  --concept-font-proof-heading: clamp(2rem, 3.7vw, 3.5rem);
  --concept-font-final-heading: clamp(1.85rem, 3.2vw, 3.1rem);
  --concept-font-mobile-title: clamp(2.2rem, 10vw, 3.05rem);
  --concept-screen-offset: -3.5rem;
  --concept-mobile-section-space: 3rem;

  min-height: 100vh;
  color: var(--concept-ink);
  background: var(--concept-paper);
}

.concept-page *,
.concept-page *::before,
.concept-page *::after {
  box-sizing: border-box;
}

.concept-page a {
  color: inherit;
}

.concept-page :where(h1, h2, h3) {
  overflow-wrap: normal;
  hyphens: none;
  text-wrap: balance;
  word-break: normal;
}

.concept-skip {
  position: fixed;
  z-index: 100;
  inset-block-start: var(--space-sm);
  inset-inline-start: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  color: var(--color-primary-contrast);
  background: var(--concept-gold);
  text-decoration: none;
  transform: translateY(-180%);
}

.concept-skip:focus {
  transform: translateY(0);
}

.review-bar {
  color: var(--concept-paper);
  background: var(--concept-ink);
}

.review-bar__inner,
.concept-nav__inner,
.concept-shell,
.concept-footer__inner {
  width: min(100% - (2 * var(--space-lg)), var(--concept-width));
  margin-inline: auto;
}

.review-bar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  min-height: 2.65rem;
  font-size: var(--concept-font-sm);
}

.review-bar__status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 600;
}

.review-bar__status::before {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: var(--radius-full);
  background: var(--color-warning);
  content: '';
}

.review-bar__links {
  display: flex;
  gap: var(--space-lg);
}

.review-bar a {
  color: inherit;
  text-decoration: none;
}

.review-bar a:hover {
  text-decoration: underline;
}

.concept-nav {
  position: sticky;
  z-index: 30;
  inset-block-start: 0;
  border-bottom: 1px solid color-mix(in srgb, var(--concept-line) 84%, transparent);
  background: color-mix(in srgb, var(--concept-paper) 92%, transparent);
  backdrop-filter: blur(1rem);
}

.concept-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  min-height: 4.75rem;
}

.concept-brand {
  flex: none;
  width: 8.75rem;
}

.concept-brand img {
  width: 100%;
}

.concept-nav__links {
  display: flex;
  align-items: center;
  gap: clamp(var(--space-md), 2vw, var(--space-xl));
  font-size: var(--concept-font-base-small);
  font-weight: 600;
}

.concept-nav__links a {
  text-decoration: none;
}

.concept-nav__links a:hover {
  color: var(--concept-gold-text);
}

.concept-nav__back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--concept-muted);
}

.concept-nav__back::before {
  content: '←';
}

.concept-shell {
  padding-block: clamp(3rem, 6vw, 5.5rem);
}

.concept-kicker {
  margin: 0 0 var(--space-md);
  color: var(--concept-gold-text);
  font-size: var(--concept-font-sm);
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.concept-title,
.concept-heading,
.compare-hero h1 {
  font-family: var(--font-serif);
  font-weight: 600;
  text-wrap: balance;
}

.concept-title {
  max-width: 12ch;
  margin: 0;
  font-size: var(--concept-font-title);
  line-height: 0.96;
  letter-spacing: -0.045em;
}

.concept-lead {
  max-width: 42rem;
  margin: var(--space-xl) 0 0;
  color: var(--concept-muted);
  font-size: clamp(var(--concept-font-lead), 1.7vw, 1.35rem);
  line-height: 1.65;
}

.concept-heading {
  max-width: 16ch;
  margin: 0;
  font-size: var(--concept-font-heading);
  line-height: 1.02;
  letter-spacing: -0.035em;
}

.concept-section-intro {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(18rem, 0.65fr);
  align-items: end;
  gap: clamp(var(--space-xl), 6vw, 6rem);
  margin-bottom: clamp(2.5rem, 6vw, 5rem);
}

.concept-section-intro > p {
  margin: 0;
  color: var(--concept-muted);
  font-size: var(--concept-font-lg);
  line-height: 1.65;
}

.concept-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.concept-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3.25rem;
  padding: var(--space-sm) var(--space-xl);
  border: 1px solid transparent;
  border-radius: var(--radius-full);
  font-weight: 700;
  text-decoration: none;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast),
    background-color var(--transition-fast);
}

.concept-button:hover {
  transform: translateY(-0.12rem);
}

.concept-page .concept-button--primary {
  color: var(--color-primary-contrast);
  background: var(--app-primary-gradient);
  box-shadow: 0 0.75rem 1.75rem color-mix(in srgb, var(--concept-gold) 28%, transparent);
}

.concept-page .concept-button--secondary {
  border-color: var(--concept-line-strong);
  color: var(--concept-ink);
  background: var(--concept-surface);
}

.concept-page .concept-button--quiet {
  min-height: auto;
  padding-inline: 0;
  color: var(--concept-gold-text);
}

.concept-button--quiet::after {
  margin-inline-start: var(--space-sm);
  content: '→';
}

.concept-trust {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-xl);
  margin: var(--space-xl) 0 0;
  padding: 0;
  color: var(--concept-muted);
  font-size: var(--concept-font-base-small);
  list-style: none;
}

.concept-trust li::before {
  margin-inline-end: var(--space-sm);
  color: var(--color-success-text);
  content: '✓';
  font-weight: 700;
}

.screen-frame {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--concept-line-strong);
  border-radius: calc(var(--radius-lg) * 1.4);
  background: var(--concept-surface);
  box-shadow: var(--concept-shadow);
}

.screen-frame::before {
  display: block;
  height: 1.65rem;
  border-bottom: 1px solid var(--concept-line);
  background: radial-gradient(circle at 0.85rem 50%, var(--concept-danger) 0 0.2rem, transparent 0.22rem),
    radial-gradient(circle at 1.55rem 50%, var(--color-warning) 0 0.2rem, transparent 0.22rem),
    radial-gradient(circle at 2.25rem 50%, var(--color-success) 0 0.2rem, transparent 0.22rem), var(--concept-soft);
  content: '';
}

.screen-frame img {
  width: 100%;
}

.phone-frame {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 0.42rem solid var(--color-device-frame);
  border-radius: 2.25rem;
  background: var(--concept-surface);
  box-shadow: 0 0 0 1px var(--color-device-frame-edge), var(--concept-shadow);
}

.phone-frame::before {
  position: absolute;
  z-index: 2;
  inset-block-start: 0.45rem;
  inset-inline-start: 50%;
  width: 29%;
  height: 0.38rem;
  border-radius: var(--radius-full);
  background: var(--color-device-frame);
  content: '';
  transform: translateX(-50%);
}

.phone-frame img {
  width: 100%;
}

.concept-footer {
  border-top: 1px solid var(--concept-line);
}

.concept-footer__inner {
  display: flex;
  justify-content: space-between;
  gap: var(--space-lg);
  padding-block: var(--space-xl);
  color: var(--concept-muted);
  font-size: var(--concept-font-sm);
}

/* Comparison hub */
.compare-page {
  background: radial-gradient(
      circle at 15% 8%,
      color-mix(in srgb, var(--concept-gold) 13%, transparent),
      transparent 28rem
    ),
    var(--concept-paper);
}

.compare-page .concept-shell {
  padding-block-start: clamp(3rem, 5vw, 4.5rem);
}

.compare-hero {
  max-width: 60rem;
  padding-block-end: clamp(2.5rem, 5vw, 4rem);
}

.compare-hero h1 {
  max-width: 11ch;
  margin: 0;
  font-size: var(--concept-font-compare-title);
  line-height: 0.93;
  letter-spacing: -0.055em;
}

.compare-hero p:not(.concept-kicker) {
  max-width: 47rem;
  margin: var(--space-xl) 0 0;
  color: var(--concept-muted);
  font-size: var(--concept-font-compare-lead);
  line-height: 1.65;
}

.compare-principles {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin: var(--space-xl) 0 0;
  padding: 0;
  list-style: none;
}

.compare-principles li {
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--concept-line);
  border-radius: var(--radius-full);
  background: var(--concept-surface);
  font-size: var(--concept-font-base-small);
  font-weight: 600;
}

.variant-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-lg);
  padding-block-end: clamp(4rem, 8vw, 7rem);
}

.variant-card {
  position: relative;
  display: flex;
  min-width: 0;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--concept-line);
  border-radius: calc(var(--radius-lg) * 1.5);
  background: var(--concept-surface);
  box-shadow: var(--shadow-elevated);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.variant-card:hover,
.variant-card:focus-within {
  box-shadow: var(--concept-shadow);
  transform: translateY(-0.35rem);
}

.variant-card__preview {
  position: relative;
  height: 17rem;
  overflow: hidden;
  background: var(--concept-soft);
}

.variant-card__preview img {
  width: 118%;
  max-width: none;
  height: 100%;
  object-fit: cover;
  object-position: top left;
}

.variant-card--story .variant-card__preview {
  background: var(--concept-ink);
}

.variant-card--story .variant-card__preview img {
  width: 44%;
  height: 135%;
  margin-inline: auto;
  object-fit: cover;
  object-position: top;
}

.variant-card--dual .variant-card__preview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--concept-line-strong);
}

.variant-card--dual .variant-card__preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
}

.variant-card--combined {
  display: grid;
  grid-column: 1 / -1;
  grid-template-columns: minmax(20rem, 0.9fr) minmax(0, 1.1fr);
}

.variant-card--combined .variant-card__preview {
  height: 100%;
  min-height: 22rem;
}

.variant-card__label {
  position: absolute;
  z-index: 2;
  inset-block-start: var(--space-md);
  inset-inline-start: var(--space-md);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-full);
  color: var(--color-primary-contrast);
  background: var(--concept-gold);
  font-size: var(--concept-font-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.variant-card__body {
  display: flex;
  flex: 1;
  flex-direction: column;
  padding: var(--space-xl);
}

.variant-card h2 {
  margin: 0 0 var(--space-sm);
  font-family: var(--font-serif);
  font-size: var(--concept-font-card-title);
  line-height: 1.1;
}

.variant-card__promise {
  margin: 0 0 var(--space-md);
  font-weight: 700;
}

.variant-card__body > p:not(.variant-card__promise) {
  margin: 0;
  color: var(--concept-muted);
  line-height: 1.6;
}

.variant-card__best {
  margin-top: var(--space-lg);
  padding-top: var(--space-md);
  border-top: 1px solid var(--concept-line);
  color: var(--concept-muted);
  font-size: var(--concept-font-base-small);
}

.variant-card__link {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  margin-top: auto;
  padding-top: var(--space-xl);
  color: var(--concept-gold-text);
  font-weight: 700;
  text-decoration: none;
}

.variant-card__link::after {
  content: '→';
  font-size: var(--concept-font-xl);
}

.compare-table-wrap {
  padding-block: clamp(4rem, 7vw, 6rem);
  overflow-x: auto;
  border-top: 1px solid var(--concept-line);
}

.compare-table {
  width: 100%;
  min-width: 64rem;
  margin-top: var(--space-xl);
  border-collapse: collapse;
  background: var(--concept-surface);
}

.compare-table th,
.compare-table td {
  padding: var(--space-md);
  border-bottom: 1px solid var(--concept-line);
  text-align: left;
  vertical-align: top;
}

.compare-table th {
  font-size: var(--concept-font-sm);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.compare-table td:not(:first-child) {
  color: var(--concept-muted);
}

/* Variant A — evolution of the original overview */
.overview-hero {
  display: grid;
  grid-template-columns: minmax(0, 0.78fr) minmax(28rem, 1.22fr);
  align-items: center;
  gap: clamp(2rem, 5vw, 5rem);
  min-height: calc(100svh - 7.4rem);
  padding-block: clamp(3rem, 6vw, 5rem);
}

.overview-lockup {
  width: min(100%, 19rem);
  margin-bottom: var(--space-xl);
}

.overview-hero .concept-title {
  font-size: var(--concept-font-overview-title);
}

.overview-stage {
  position: relative;
  padding-block: var(--space-xl);
}

.overview-stage::before {
  position: absolute;
  z-index: -1;
  inset: 0 4% 0 10%;
  border-radius: 50%;
  background: color-mix(in srgb, var(--concept-gold) 16%, transparent);
  filter: blur(3.5rem);
  content: '';
}

.overview-stage .screen-frame {
  transform: none;
}

.overview-stage__badge {
  position: absolute;
  inset-block-end: 0;
  inset-inline-start: 0;
  max-width: 15rem;
  padding: var(--space-md);
  border: 1px solid var(--concept-line);
  border-radius: var(--radius-lg);
  background: var(--concept-surface);
  box-shadow: var(--concept-shadow);
}

.overview-stage__badge strong,
.overview-stage__badge span {
  display: block;
}

.overview-stage__badge span {
  margin-top: var(--space-xs);
  color: var(--concept-muted);
  font-size: var(--concept-font-sm);
}

.overview-ribbon {
  border-block: 1px solid var(--concept-line);
  background: var(--concept-surface);
}

.overview-ribbon ul {
  display: flex;
  width: min(100% - (2 * var(--space-lg)), var(--concept-width));
  margin: 0 auto;
  padding: var(--space-lg) 0;
  overflow-x: auto;
  list-style: none;
  scrollbar-width: thin;
}

.overview-ribbon li {
  display: inline-flex;
  align-items: center;
  flex: 1 0 auto;
  gap: var(--space-sm);
  padding-inline: var(--space-lg);
  border-inline-end: 1px solid var(--concept-line);
  color: var(--concept-muted);
  white-space: nowrap;
}

.overview-ribbon li:first-child {
  padding-inline-start: 0;
}

.overview-ribbon li:last-child {
  border: 0;
}

.overview-ribbon li::before {
  width: 0.55rem;
  height: 0.55rem;
  border-radius: var(--radius-full);
  background: var(--concept-gold);
  content: '';
}

.overview-feature {
  display: grid;
  grid-template-columns: minmax(18rem, 0.72fr) minmax(0, 1.28fr);
  align-items: center;
  gap: clamp(2rem, 7vw, 7rem);
  padding-block: clamp(3rem, 7vw, 6.5rem);
}

.overview-feature:nth-child(even) .overview-feature__copy {
  order: 2;
}

.overview-feature__copy h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: var(--concept-font-overview-heading);
  line-height: 1.05;
  letter-spacing: -0.03em;
}

.overview-feature__copy > p:not(.concept-kicker) {
  margin: var(--space-lg) 0 0;
  color: var(--concept-muted);
  font-size: var(--concept-font-copy);
  line-height: 1.65;
}

.overview-feature__list {
  display: grid;
  gap: var(--space-md);
  margin: var(--space-xl) 0 0;
  padding: 0;
  list-style: none;
}

.overview-feature__list li {
  display: grid;
  grid-template-columns: 1.6rem 1fr;
  gap: var(--space-sm);
}

.overview-feature__list li::before {
  display: grid;
  width: 1.55rem;
  height: 1.55rem;
  place-items: center;
  border-radius: var(--radius-full);
  color: var(--concept-gold-text);
  background: var(--color-brand-subtle);
  content: '✓';
  font-size: var(--concept-font-xs);
  font-weight: 700;
}

.overview-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-md);
}

.overview-card {
  padding: var(--space-lg);
  border: 1px solid var(--concept-line);
  border-radius: var(--radius-lg);
  background: var(--concept-surface);
}

.overview-card span {
  color: var(--concept-gold-text);
  font-family: var(--font-mono);
  font-size: var(--concept-font-xs);
  font-weight: 700;
}

.overview-card h3 {
  margin: var(--space-md) 0 var(--space-sm);
  font-size: var(--concept-font-body);
}

.overview-card p {
  margin: 0;
  color: var(--concept-muted);
  font-size: var(--concept-font-base-small);
  line-height: 1.55;
}

/* Variant B — narrative day */
.story-page {
  background: var(--concept-story-night);
  color: var(--concept-story-paper);
}

:root[data-theme='dark'] .story-page {
  --concept-story-night: var(--concept-paper);
  --concept-story-paper: var(--concept-ink);
  --concept-story-muted: var(--concept-muted);
}

.story-page .review-bar {
  border-bottom: 1px solid color-mix(in srgb, var(--concept-story-paper) 16%, transparent);
  color: var(--concept-story-paper);
  background: var(--concept-story-night);
}

.story-page .concept-nav {
  border-bottom-color: color-mix(in srgb, var(--concept-story-paper) 12%, transparent);
  color: var(--concept-story-paper);
  background: color-mix(in srgb, var(--concept-story-night) 90%, transparent);
}

.story-page .concept-muted,
.story-page .concept-lead,
.story-page .concept-nav__back,
.story-page .concept-trust {
  color: var(--concept-story-muted);
}

.story-hero {
  position: relative;
  min-height: calc(100svh - 7.4rem);
  padding-block: clamp(4rem, 9vw, 8rem);
  overflow: hidden;
}

.story-hero::before {
  position: absolute;
  inset: 5% -8% auto auto;
  width: min(52rem, 68vw);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--concept-gold) 36%, transparent), transparent 68%);
  content: '';
}

.story-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(23rem, 0.55fr);
  align-items: center;
  gap: clamp(2rem, 7vw, 8rem);
}

.story-hero .concept-kicker {
  color: color-mix(in srgb, var(--concept-gold) 75%, var(--color-surface));
}

.story-hero .concept-title {
  max-width: 11ch;
  font-size: var(--concept-font-story-title);
}

.story-hero .concept-lead {
  color: var(--concept-story-muted);
}

.story-hero .concept-button--secondary {
  border-color: color-mix(in srgb, var(--concept-story-paper) 35%, transparent);
  color: var(--concept-story-paper);
  background: transparent;
}

.story-hero__phone {
  width: min(100%, 22rem);
  justify-self: center;
  transform: rotate(2.5deg);
}

.story-hero__time {
  position: absolute;
  z-index: 2;
  inset-block-start: 14%;
  inset-inline-end: -10%;
  color: color-mix(in srgb, var(--concept-story-paper) 10%, transparent);
  font-family: var(--font-mono);
  font-size: var(--concept-font-story-time);
  font-weight: 700;
  line-height: 0.8;
  writing-mode: vertical-rl;
}

.story-chapters {
  background: var(--concept-paper);
  color: var(--concept-ink);
}

.story-chapter {
  display: grid;
  grid-template-columns: minmax(17rem, 0.65fr) minmax(0, 1.35fr);
  align-items: start;
  gap: clamp(2rem, 8vw, 9rem);
  min-height: 100svh;
  padding-block: clamp(5rem, 10vw, 9rem);
  border-bottom: 1px solid var(--concept-line);
}

.story-chapter__copy {
  position: sticky;
  inset-block-start: 8rem;
}

.story-chapter__time {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
  color: var(--concept-gold-text);
  font-family: var(--font-mono);
  font-size: var(--concept-font-base-small);
  font-weight: 700;
}

.story-chapter__time::before {
  width: 0.6rem;
  height: 0.6rem;
  border-radius: var(--radius-full);
  background: var(--concept-gold);
  content: '';
}

.story-chapter h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: var(--concept-font-story-heading);
  line-height: 1;
  letter-spacing: -0.035em;
}

.story-chapter__copy p {
  margin: var(--space-lg) 0 0;
  color: var(--concept-muted);
  font-size: var(--concept-font-lead);
  line-height: 1.7;
}

.story-chapter__visual {
  position: relative;
  align-self: center;
}

.story-chapter__visual--phone {
  display: flex;
  justify-content: center;
}

.story-chapter__visual--phone .phone-frame {
  width: min(100%, 22rem);
}

.story-chapter__caption {
  position: absolute;
  inset-block-end: -1.25rem;
  inset-inline-end: -1rem;
  max-width: 17rem;
  padding: var(--space-md);
  border: 1px solid var(--concept-line);
  border-radius: var(--radius-lg);
  background: var(--concept-surface);
  box-shadow: var(--concept-shadow);
}

.story-chapter__caption strong,
.story-chapter__caption span {
  display: block;
}

.story-chapter__caption span {
  margin-top: var(--space-xs);
  color: var(--concept-muted);
  font-size: var(--concept-font-sm);
}

.story-payoff {
  text-align: center;
}

.story-payoff .concept-heading,
.story-payoff .concept-lead {
  margin-inline: auto;
}

.story-payoff .concept-heading {
  max-width: 18ch;
}

.story-payoff .concept-actions {
  justify-content: center;
}

.story-page .dual-final {
  border: 1px solid color-mix(in srgb, var(--concept-story-paper) 14%, transparent);
  color: var(--concept-story-paper);
  background: var(--concept-story-night);
}

.story-page .dual-final p {
  color: var(--concept-story-muted);
}

.story-page .dual-final .concept-button--secondary {
  border-color: color-mix(in srgb, var(--concept-story-paper) 35%, transparent);
  color: var(--concept-story-paper);
}

/* Variant C — two connected paths */
.dual-page {
  background: linear-gradient(
      90deg,
      color-mix(in srgb, var(--concept-gold) 6%, transparent) 0 50%,
      transparent 50% 100%
    ),
    var(--concept-paper);
}

.dual-hero {
  padding-block: clamp(4rem, 8vw, 7rem);
}

.dual-hero__top {
  max-width: 70rem;
  text-align: center;
  margin-inline: auto;
}

.dual-hero__top .concept-title {
  max-width: 14ch;
  margin-inline: auto;
}

.dual-hero__top .concept-lead {
  margin-inline: auto;
}

.dual-paths {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-lg);
  margin-top: clamp(3rem, 7vw, 6rem);
}

.dual-path {
  position: relative;
  display: grid;
  grid-template-rows: auto 1fr;
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--concept-line);
  border-radius: calc(var(--radius-lg) * 1.6);
  background: var(--concept-surface);
  box-shadow: var(--shadow-elevated);
}

.dual-path--school {
  background: var(--concept-ink);
  color: var(--concept-paper);
}

.dual-path__copy {
  padding: clamp(1.5rem, 4vw, 3rem);
}

.dual-path__audience {
  margin: 0 0 var(--space-md);
  color: var(--concept-gold-text);
  font-size: var(--concept-font-xs);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.dual-path--school .dual-path__audience {
  color: color-mix(in srgb, var(--concept-gold) 78%, var(--color-surface));
}

.dual-path h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: var(--concept-font-dual-heading);
  line-height: 1.03;
}

.dual-path__copy > p:not(.dual-path__audience) {
  margin: var(--space-lg) 0 0;
  color: var(--concept-muted);
  font-size: var(--concept-font-body);
  line-height: 1.65;
}

.dual-path--school .dual-path__copy > p:not(.dual-path__audience) {
  color: color-mix(in srgb, var(--concept-paper) 72%, transparent);
}

.dual-path--school .concept-button--secondary {
  border-color: color-mix(in srgb, var(--concept-paper) 35%, transparent);
  color: var(--concept-paper);
  background: transparent;
}

.dual-path__visual {
  align-self: end;
  min-height: 21rem;
  padding: 0 clamp(1rem, 3vw, 2rem);
  overflow: hidden;
}

.dual-path__visual .screen-frame {
  margin-bottom: var(--concept-screen-offset);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  box-shadow: 0 -1rem 3rem color-mix(in srgb, var(--concept-ink) 12%, transparent);
}

.dual-path--school .dual-path__visual .screen-frame {
  border-color: color-mix(in srgb, var(--concept-paper) 22%, transparent);
}

.dual-bridge {
  position: relative;
  text-align: center;
}

.dual-bridge::before {
  position: absolute;
  z-index: -1;
  inset: 50% 0 auto;
  height: 1px;
  background: var(--concept-line);
  content: '';
}

.dual-bridge span {
  display: inline-block;
  padding: var(--space-sm) var(--space-lg);
  border: 1px solid var(--concept-line);
  border-radius: var(--radius-full);
  background: var(--concept-paper);
  color: var(--concept-muted);
  font-size: var(--concept-font-base-small);
  font-weight: 600;
}

.dual-proof {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(18rem, 0.75fr);
  align-items: center;
  gap: clamp(2rem, 7vw, 7rem);
}

.dual-proof__copy h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-size: var(--concept-font-proof-heading);
  line-height: 1.02;
  letter-spacing: -0.035em;
}

.dual-proof__copy > p:not(.concept-kicker) {
  margin: var(--space-lg) 0 0;
  color: var(--concept-muted);
  font-size: var(--concept-font-lead);
  line-height: 1.7;
}

.dual-values {
  display: grid;
  gap: var(--space-md);
}

.dual-value {
  display: grid;
  grid-template-columns: 2.3rem 1fr;
  gap: var(--space-md);
  padding: var(--space-lg);
  border: 1px solid var(--concept-line);
  border-radius: var(--radius-lg);
  background: var(--concept-surface);
}

.dual-value__icon {
  display: grid;
  width: 2.3rem;
  height: 2.3rem;
  place-items: center;
  border-radius: var(--radius-full);
  color: var(--concept-gold-text);
  background: var(--color-brand-subtle);
  font-weight: 700;
}

.dual-value strong,
.dual-value span {
  display: block;
}

.dual-value span {
  margin-top: var(--space-xs);
  color: var(--concept-muted);
  font-size: var(--concept-font-base-small);
  line-height: 1.5;
}

.dual-final {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-xl);
  padding: clamp(2rem, 5vw, 4rem);
  border-radius: calc(var(--radius-lg) * 1.6);
  color: var(--concept-paper);
  background: var(--concept-ink);
}

.dual-final h2 {
  max-width: 19ch;
  margin: 0;
  font-family: var(--font-serif);
  font-size: var(--concept-font-final-heading);
  line-height: 1.04;
}

.dual-final p {
  max-width: 45rem;
  margin: var(--space-md) 0 0;
  color: color-mix(in srgb, var(--concept-paper) 72%, transparent);
}

.dual-final .concept-button--secondary {
  border-color: color-mix(in srgb, var(--concept-paper) 35%, transparent);
  color: var(--concept-paper);
  background: transparent;
}

.story-payoff .concept-kicker {
  color: color-mix(in srgb, var(--concept-gold) 75%, var(--color-surface));
}

.story-page .concept-footer__inner {
  color: var(--concept-story-muted);
}

/* Review-only controls for comparing appearance and color profiles. */
.theme-preview {
  position: fixed;
  z-index: 90;
  inset-block-end: var(--space-md);
  inset-inline-end: var(--space-md);
  width: min(calc(100vw - (2 * var(--space-md))), 20rem);
  overflow: hidden;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
  color: var(--color-text);
  background: var(--color-surface);
  box-shadow: var(--shadow-elevated);
}

.theme-preview:not([open]) {
  width: max-content;
  max-width: calc(100vw - (2 * var(--space-md)));
}

.theme-preview:not([open]) summary {
  white-space: nowrap;
}

.theme-preview summary {
  padding: var(--space-sm) var(--space-md);
  color: var(--color-text);
  font-size: var(--concept-font-base-small);
  font-weight: 700;
  cursor: pointer;
}

.theme-preview[open] summary {
  border-bottom: 1px solid var(--color-border);
}

.theme-preview summary::marker {
  color: var(--color-primary-text);
}

.theme-preview__panel {
  display: grid;
  gap: var(--space-md);
  padding: var(--space-md);
}

.theme-preview__intro,
.theme-preview__note {
  margin: 0;
  color: var(--color-text-muted);
  font-size: var(--concept-font-sm);
  line-height: 1.45;
}

.theme-preview__field {
  display: grid;
  gap: var(--space-xs);
  color: var(--color-text);
  font-size: var(--concept-font-sm);
  font-weight: 600;
}

.theme-preview select {
  width: 100%;
  min-height: 2.5rem;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  background: var(--color-bg-elevated);
  font: inherit;
}

.theme-preview select:focus-visible,
.theme-preview summary:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.theme-preview__note {
  padding-top: var(--space-sm);
  border-top: 1px solid var(--color-border);
}

@media (max-width: 68rem) {
  .variant-grid {
    grid-template-columns: 1fr;
  }

  .variant-card {
    display: grid;
    grid-template-columns: minmax(17rem, 0.75fr) minmax(0, 1fr);
  }

  .variant-card--combined {
    grid-template-columns: minmax(17rem, 0.75fr) minmax(0, 1fr);
  }

  .variant-card__preview {
    height: 100%;
    min-height: 22rem;
  }

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

@media (max-width: 54rem) {
  .concept-nav__inner {
    align-items: flex-start;
    flex-direction: column;
    gap: var(--space-sm);
    padding-block: var(--space-md);
  }

  .concept-nav__links {
    width: 100%;
    padding-bottom: var(--space-xs);
    overflow-x: auto;
    white-space: nowrap;
    scrollbar-width: thin;
  }

  .concept-section-intro,
  .overview-hero,
  .overview-feature,
  .story-hero__grid,
  .story-chapter,
  .dual-proof,
  .dual-final {
    grid-template-columns: 1fr;
  }

  .overview-hero {
    min-height: auto;
  }

  .overview-stage {
    margin-top: var(--space-xl);
  }

  .overview-feature:nth-child(even) .overview-feature__copy {
    order: initial;
  }

  .story-hero {
    min-height: auto;
  }

  .story-hero__time {
    display: none;
  }

  .story-chapter {
    min-height: auto;
  }

  .story-chapter__copy {
    position: static;
  }

  .dual-final .concept-actions {
    margin-top: 0;
  }
}

@media (max-width: 44rem) {
  .review-bar__inner {
    align-items: flex-start;
    flex-direction: column;
    gap: var(--space-xs);
    padding-block: var(--space-sm);
  }

  .review-bar__links {
    width: 100%;
    gap: var(--space-md);
    overflow-x: auto;
    white-space: nowrap;
  }

  .concept-shell {
    padding-block: var(--concept-mobile-section-space);
  }

  .concept-title,
  .compare-hero h1,
  .story-hero .concept-title {
    max-width: none;
    font-size: var(--concept-font-mobile-title);
  }

  .variant-card {
    display: flex;
  }

  .variant-card--combined {
    grid-column: auto;
  }

  .variant-card__preview {
    height: 15rem;
    min-height: 0;
  }

  .variant-card--story .variant-card__preview img {
    width: 50%;
  }

  .compare-table-wrap {
    overflow-x: auto;
  }

  .compare-table {
    min-width: 44rem;
  }

  .overview-stage__badge {
    position: relative;
    inset: auto;
    max-width: none;
    margin: calc(-1 * var(--space-md)) var(--space-md) 0;
  }

  .overview-grid,
  .dual-paths {
    grid-template-columns: 1fr;
  }

  .story-hero__phone {
    width: min(80%, 19rem);
  }

  .story-chapter__visual--phone .phone-frame {
    width: min(80%, 19rem);
  }

  .story-chapter__caption {
    position: relative;
    inset: auto;
    max-width: none;
    margin: calc(-1 * var(--space-md)) var(--space-md) 0;
  }

  .dual-path__visual {
    min-height: 16rem;
  }

  .concept-footer__inner {
    flex-direction: column;
  }

  .theme-preview {
    inset-inline: var(--space-sm);
    width: auto;
  }

  .theme-preview:not([open]) {
    inset-inline-start: auto;
    width: max-content;
    max-width: calc(100vw - (2 * var(--space-sm)));
  }
}

@media (forced-colors: active) {
  .review-bar,
  .story-page,
  .dual-path--school,
  .dual-final {
    border: 1px solid CanvasText;
  }
}