/* platform.css — Shared stylesheet for /platform section
   Imports design tokens from base.css (linked separately in each page).
   ------------------------------------------------------------------ */

/* =====================================================================
   FONTS (preconnect in HTML head, loaded via Google Fonts)
   ===================================================================== */

/* =====================================================================
   LAYOUT UTILITIES
   ===================================================================== */

.container {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 5vw, 3rem);
}

.container--narrow {
  max-width: 820px;
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 5vw, 3rem);
}

.container--prose {
  max-width: 720px;
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 5vw, 3rem);
}

/* =====================================================================
   SITE HEADER
   ===================================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(12, 12, 12, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
  flex-shrink: 0;
}

.logo-text {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: var(--text-sm);
  letter-spacing: -0.01em;
  white-space: nowrap;
}

nav[aria-label="Main navigation"] {
  margin-left: auto;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  display: block;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  border-radius: var(--radius-md);
  white-space: nowrap;
  transition: color var(--transition-interactive), background var(--transition-interactive);
}

.nav-links a:hover {
  color: var(--color-text);
  background: var(--color-border);
}

.nav-links a[aria-current="page"] {
  color: var(--color-text);
}

.nav-links a.nav-cta {
  background: var(--color-accent-dim);
  color: var(--color-accent);
  border: 1px solid rgba(74, 222, 128, 0.2);
  padding: var(--space-2) var(--space-4);
}

.nav-links a.nav-cta:hover {
  background: rgba(74, 222, 128, 0.2);
  color: var(--color-accent);
}

/* =====================================================================
   PLATFORM SUB-NAV
   ===================================================================== */

.platform-subnav {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 64px;
  z-index: 90;
}

.platform-subnav .container {
  display: flex;
  align-items: stretch;
  height: 44px;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.platform-subnav .container::-webkit-scrollbar {
  display: none;
}

.subnav-links {
  display: flex;
  align-items: stretch;
  gap: 0;
  list-style: none;
  margin: 0;
  padding: 0;
  flex-shrink: 0;
}

.subnav-links a {
  display: flex;
  align-items: center;
  padding-inline: var(--space-4);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: color var(--transition-interactive), border-color var(--transition-interactive);
}

.subnav-links a:hover {
  color: var(--color-text-muted);
}

.subnav-links a[aria-current="page"] {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* =====================================================================
   PAGE HERO
   ===================================================================== */

.page-hero {
  padding-block: clamp(4rem, 10vw, 8rem);
  border-bottom: 1px solid var(--color-border);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}

.page-headline {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 400;
  line-height: 1.1;
  color: var(--color-text);
  margin-bottom: var(--space-6);
  max-width: 18ch;
}

.page-headline em {
  font-style: italic;
  color: var(--color-accent);
}

.page-subhead {
  font-family: var(--font-body);
  font-size: var(--text-lg);
  line-height: 1.6;
  color: var(--color-text-muted);
  max-width: 65ch;
  margin-bottom: var(--space-6);
}

.meta-line {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  letter-spacing: 0.04em;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
}

.meta-line span {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
}

.meta-line strong {
  color: var(--color-text-muted);
  font-weight: 500;
}

/* =====================================================================
   ARTICLE / LONG-FORM CONTENT
   ===================================================================== */

.platform-article {
  padding-block: clamp(3rem, 8vw, 6rem);
}

.platform-article section {
  margin-bottom: clamp(4rem, 10vw, 7rem);
}

.platform-article section:last-child {
  margin-bottom: 0;
}

.section-roman {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: var(--space-4);
  display: block;
}

.platform-article h2 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-6);
  line-height: 1.2;
}

.platform-article h3 {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
  margin-top: var(--space-8);
}

.platform-article p {
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: var(--space-5);
  font-size: var(--text-base);
}

.platform-article p:last-child {
  margin-bottom: 0;
}

/* Numbered consequence items */
.consequence-item {
  padding-block: var(--space-5);
  border-top: 1px solid var(--color-border);
}

.consequence-item:last-child {
  border-bottom: 1px solid var(--color-border);
}

.consequence-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-2);
  display: block;
}

/* Pull quote */
blockquote.pull-quote {
  margin-block: var(--space-10);
  padding: var(--space-6) var(--space-8);
  border-left: 3px solid var(--color-accent);
  background: rgba(74, 222, 128, 0.04);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

blockquote.pull-quote p {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-style: italic;
  line-height: 1.65;
  color: var(--color-text);
  max-width: 70ch;
}

/* Code block */
pre.code-block {
  background: #111;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  overflow-x: auto;
  margin-block: var(--space-6);
}

pre.code-block code {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--color-text-muted);
}

.sql-comment { color: var(--color-text-faint); }
.sql-keyword { color: var(--color-blue); }
.sql-table   { color: var(--color-accent); }
.sql-field   { color: #f9a8d4; }
.sql-cond    { color: var(--color-text-muted); }

/* Disambiguations / definition-like blocks */
.disambig-grid {
  display: grid;
  gap: 0;
  margin-block: var(--space-8);
}

.disambig-item {
  padding-block: var(--space-6);
  padding-inline-start: var(--space-6);
  border-left: 2px solid var(--color-border-strong);
  margin-bottom: var(--space-1);
}

.disambig-item h3 {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-blue);
  margin-bottom: var(--space-3);
  margin-top: 0;
}

.disambig-item p {
  margin-bottom: 0;
}

/* Closing display */
.article-closing {
  padding-block: clamp(4rem, 8vw, 6rem);
  border-top: 1px solid var(--color-border);
  text-align: left;
}

.closing-display {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-style: italic;
  color: var(--color-accent);
  line-height: 1.2;
  margin-bottom: var(--space-6);
  max-width: 22ch;
}

.closing-body {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 60ch;
  line-height: 1.7;
  margin-bottom: 0;
}

/* =====================================================================
   MODE CARDS (Three Modes page)
   ===================================================================== */

.modes-section {
  padding-block: clamp(3rem, 8vw, 6rem);
}

.mode-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: clamp(2rem, 5vw, 3.5rem);
  margin-bottom: clamp(2rem, 4vw, 3rem);
  background: var(--color-surface);
  position: relative;
}

.mode-number {
  font-family: var(--font-mono);
  font-size: clamp(3rem, 8vw, 5rem);
  font-weight: 400;
  color: var(--color-border-strong);
  line-height: 1;
  margin-bottom: var(--space-4);
  letter-spacing: -0.02em;
  user-select: none;
}

.mode-name {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-3);
  line-height: 1.2;
}

.mode-positioning {
  font-family: var(--font-body);
  font-style: italic;
  color: var(--color-text-muted);
  font-size: var(--text-base);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.mode-details {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--space-8);
}

.mode-detail-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: var(--space-3);
  display: block;
}

.mode-detail-body {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
  margin: 0;
}

.mode-metric {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-accent);
  font-weight: 500;
}

.mode-metric-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.mode-metric-list li {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-muted);
  line-height: 1.8;
  max-width: none;
}

.mode-metric-list li strong {
  color: var(--color-accent);
  font-weight: 500;
}

/* Spectrum closing */
.spectrum-section {
  padding-block: clamp(4rem, 8vw, 6rem);
  border-top: 1px solid var(--color-border);
}

.spectrum-heading {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: var(--space-4);
}

/* =====================================================================
   CLAIM CARDS (Differentiators page)
   ===================================================================== */

.claims-section {
  padding-block: clamp(3rem, 8vw, 6rem);
}

.claim-block {
  padding-block: clamp(3rem, 6vw, 5rem);
  border-bottom: 1px solid var(--color-border);
}

.claim-block:first-child {
  border-top: 1px solid var(--color-border);
}

.claim-number {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: var(--space-3);
  display: block;
}

.claim-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  line-height: 1.2;
}

.claim-statement {
  font-size: var(--text-base);
  color: var(--color-text);
  line-height: 1.7;
  margin-bottom: var(--space-6);
  font-weight: 500;
  max-width: 70ch;
}

.claim-explanation {
  color: var(--color-text-muted);
  line-height: 1.8;
  max-width: 70ch;
  margin-bottom: var(--space-8);
}

/* Comparison tables */
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: var(--space-6);
  font-size: var(--text-sm);
  overflow: hidden;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.comparison-table thead th {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: var(--space-3) var(--space-5);
  text-align: left;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border-strong);
}

.comparison-table thead th:first-child {
  color: var(--color-text-faint);
}

.comparison-table thead th.col-us {
  color: var(--color-accent);
}

.comparison-table thead th.col-them {
  color: var(--color-text-muted);
}

.comparison-table tbody tr {
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-interactive);
}

.comparison-table tbody tr:last-child {
  border-bottom: none;
}

.comparison-table tbody tr:hover {
  background: rgba(255, 255, 255, 0.02);
}

.comparison-table td {
  padding: var(--space-4) var(--space-5);
  vertical-align: top;
  line-height: 1.5;
}

.comparison-table td:first-child {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--color-text-faint);
  width: 30%;
}

.comparison-table td.val-us {
  color: var(--color-accent);
  background: rgba(74, 222, 128, 0.03);
  font-weight: 500;
}

.comparison-table td.val-them {
  color: var(--color-text-muted);
}

/* Cost table */
.cost-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: var(--space-6);
  font-size: var(--text-sm);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.cost-table thead th {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: var(--space-3) var(--space-5);
  text-align: left;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border-strong);
  color: var(--color-text-faint);
}

.cost-table thead th:last-child {
  text-align: right;
}

.cost-table tbody tr {
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition-interactive);
}

.cost-table tbody tr:last-child {
  border-bottom: 2px solid var(--color-border-strong);
}

.cost-table tbody tr:hover {
  background: rgba(255, 255, 255, 0.02);
}

.cost-table td {
  padding: var(--space-4) var(--space-5);
  vertical-align: top;
  line-height: 1.5;
}

.cost-table td:first-child {
  color: var(--color-text-muted);
}

.cost-table td:nth-child(2) {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-faint);
}

.cost-table td:last-child {
  text-align: right;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-muted);
}

.cost-table tfoot tr {
  background: var(--color-surface);
}

.cost-table tfoot td {
  padding: var(--space-4) var(--space-5);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-accent);
  font-weight: 500;
}

.cost-table tfoot td:last-child {
  text-align: right;
  font-size: var(--text-sm);
}

/* =====================================================================
   DEMO PAGE
   ===================================================================== */

.demo-section {
  padding-block: clamp(3rem, 8vw, 6rem);
}

.video-placeholder {
  aspect-ratio: 16 / 9;
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  margin-bottom: var(--space-4);
}

.video-play-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-6);
}

.video-play-btn svg {
  width: 80px;
  height: 80px;
  color: rgba(255, 255, 255, 0.4);
}

.video-caption {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-style: italic;
  color: var(--color-text-muted);
  text-align: center;
  margin-bottom: var(--space-2);
}

.video-subcaption {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text-faint);
  text-align: center;
  max-width: 60ch;
  text-align: center;
}

.video-status-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-5);
  background: rgba(12, 12, 12, 0.8);
  border-top: 1px solid var(--color-border);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-faint);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  flex-shrink: 0;
}

.video-note {
  font-size: var(--text-sm);
  color: var(--color-text-faint);
  font-style: italic;
  max-width: 65ch;
  line-height: 1.7;
  margin-bottom: var(--space-10);
}

/* ---------------------------------------------------------------
   Loom video embed
   --------------------------------------------------------------- */
.video-embed {
  margin: 0 0 var(--space-4) 0;
  padding: 0;
}

.video-embed-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  width: 100%;
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.video-embed-frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
}

.video-embed-caption {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  margin-top: var(--space-3);
  padding-inline: var(--space-1);
}

.video-embed-title {
  font-family: var(--font-display);
  font-style: italic;
  font-size: var(--text-lg);
  color: var(--color-text);
  letter-spacing: 0.005em;
}

.video-embed-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-faint);
}

@media (max-width: 768px) {
  .video-embed-caption {
    flex-direction: column;
    gap: var(--space-1);
  }
}

/* Stage list */
.stages-intro {
  padding-block: var(--space-10);
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-8);
}

.stages-intro-heading {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.stages-intro-body {
  color: var(--color-text-muted);
  max-width: 65ch;
  line-height: 1.7;
  margin-bottom: 0;
}

.stage-block {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: var(--space-12);
  padding-block: clamp(2.5rem, 5vw, 4rem);
  border-bottom: 1px solid var(--color-border);
}

.stage-label-col {
  padding-top: var(--space-1);
}

.stage-number {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  display: block;
  margin-bottom: var(--space-3);
}

.stage-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-text);
  line-height: 1.3;
  margin: 0;
}

.stage-content-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
}

.stage-sub-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: var(--space-3);
  display: block;
}

.stage-sub-body {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  line-height: 1.75;
  margin: 0;
}

/* Demo closing */
.demo-closing {
  padding-block: clamp(4rem, 8vw, 6rem);
  border-top: 1px solid var(--color-border);
}

.demo-closing-quote {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-style: italic;
  color: var(--color-accent);
  line-height: 1.3;
  margin-bottom: var(--space-6);
  max-width: 30ch;
}

.demo-closing-body {
  color: var(--color-text-muted);
  line-height: 1.8;
  max-width: 65ch;
  margin-bottom: 0;
}

/* =====================================================================
   CONNECT PAGE / FORM
   ===================================================================== */

.connect-section {
  padding-block: clamp(3rem, 8vw, 6rem);
}

.conversation-list {
  list-style: none;
  padding: 0;
  margin: var(--space-8) 0;
  display: grid;
  gap: var(--space-3);
}

.conversation-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-4);
  max-width: none;
}

.conversation-list li::before {
  content: "●";
  color: var(--color-accent);
  font-size: 0.6rem;
  margin-top: 0.4em;
  flex-shrink: 0;
}

.conversation-list li strong {
  color: var(--color-text);
  font-weight: 600;
}

.connect-note {
  font-size: var(--text-sm);
  color: var(--color-text-faint);
  font-style: italic;
  max-width: 65ch;
  line-height: 1.7;
  padding: var(--space-4) var(--space-5);
  border-left: 2px solid var(--color-border-strong);
  margin-bottom: var(--space-10);
}

/* Form */
.connect-form {
  max-width: 640px;
}

.form-divider {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: var(--space-8);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
}

.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: var(--space-2);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text);
  appearance: none;
  -webkit-appearance: none;
  transition: border-color var(--transition-interactive), box-shadow var(--transition-interactive);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-faint);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(74, 222, 128, 0.1);
}

.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23555' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-3) center;
  padding-right: var(--space-10);
  cursor: pointer;
}

.form-select option {
  background: var(--color-surface);
  color: var(--color-text);
}

.form-textarea {
  resize: vertical;
  min-height: 130px;
}

.btn-submit {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-8);
  background: var(--color-accent);
  color: #0C0C0C;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  letter-spacing: 0.01em;
  transition: background var(--transition-interactive), transform 100ms;
}

.btn-submit:hover {
  background: #6EE7A0;
}

.btn-submit:active {
  transform: scale(0.98);
}

.form-note {
  margin-top: var(--space-4);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-faint);
  letter-spacing: 0.04em;
}

.alternative-contact {
  margin-top: var(--space-10);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.alternative-contact a {
  color: var(--color-blue);
  text-decoration: underline;
  text-decoration-color: rgba(96, 165, 250, 0.4);
  text-underline-offset: 3px;
}

.alternative-contact a:hover {
  color: #93C5FD;
  text-decoration-color: rgba(96, 165, 250, 0.8);
}

/* =====================================================================
   PREV / NEXT NAV
   ===================================================================== */

.page-nav {
  padding-block: clamp(3rem, 6vw, 5rem);
  border-top: 1px solid var(--color-border);
}

.page-nav .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
}

.page-nav-card {
  display: block;
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--color-text);
  transition: border-color var(--transition-interactive), background var(--transition-interactive);
}

.page-nav-card:hover {
  border-color: var(--color-border-strong);
  background: rgba(255, 255, 255, 0.02);
}

.page-nav-card--next {
  text-align: right;
}

.page-nav-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  display: block;
  margin-bottom: var(--space-2);
}

.page-nav-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-text);
  line-height: 1.3;
}

.page-nav-card.page-nav-card--prev-only {
  grid-column: 1;
}

/* =====================================================================
   FOOTER
   ===================================================================== */

.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-8);
}

.site-footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.footer-copy {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.footer-links {
  display: flex;
  gap: var(--space-5);
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links a {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--color-text-muted);
}

/* =====================================================================
   MOBILE — single breakpoint 768px
   ===================================================================== */

@media (max-width: 768px) {
  /* Header */
  .site-header .container {
    position: relative;
  }

  nav[aria-label="Main navigation"] .nav-links {
    display: none;
  }

  /* Sub-nav scrolls horizontally on mobile */
  .platform-subnav {
    top: 64px;
  }

  .platform-subnav .container {
    padding-inline: var(--space-4);
  }

  /* Hero */
  .page-headline {
    font-size: clamp(2rem, 8vw, 3rem);
  }

  /* Mode cards */
  .mode-details {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }

  /* Stage blocks */
  .stage-block {
    grid-template-columns: 1fr;
    gap: var(--space-5);
  }

  .stage-content-col {
    grid-template-columns: 1fr;
    gap: var(--space-5);
  }

  /* Prev/Next */
  .page-nav .container {
    grid-template-columns: 1fr;
  }

  .page-nav-card--next {
    text-align: left;
  }

  /* Form row */
  .form-row {
    grid-template-columns: 1fr;
  }

  /* Footer */
  .site-footer .container {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
  }

  /* Tables: horizontal scroll */
  .comparison-table,
  .cost-table {
    display: block;
    overflow-x: auto;
  }

  /* Disambig */
  .disambig-item {
    padding-inline-start: var(--space-4);
  }
}

/* ============================
   REQUEST ACCESS CTA
   ============================ */
.request-access-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2.5rem;
  margin: 3.5rem 0 4rem;
  padding: 2.25rem 2.5rem;
  border: 1px solid rgba(74, 222, 128, 0.25);
  background: linear-gradient(135deg, rgba(74, 222, 128, 0.08) 0%, rgba(96, 165, 250, 0.05) 100%);
  border-radius: 4px;
}

.request-access-cta-text {
  flex: 1;
  min-width: 0;
}

.request-access-cta-eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8125rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-green, #4ADE80);
  margin: 0 0 0.5rem;
}

.request-access-cta-headline {
  font-family: 'Instrument Serif', serif;
  font-size: 2rem;
  font-weight: 400;
  line-height: 1.15;
  color: var(--color-fg, #E8E6E3);
  margin: 0 0 0.5rem;
}

.request-access-cta-headline em {
  color: var(--color-green, #4ADE80);
  font-style: italic;
}

.request-access-cta-body {
  font-size: 1rem;
  line-height: 1.5;
  color: rgba(232, 230, 227, 0.65);
  margin: 0;
  max-width: 38ch;
}

.request-access-cta-button {
  display: inline-flex;
  align-items: center;
  gap: 0.625rem;
  flex-shrink: 0;
  padding: 0.875rem 1.75rem;
  background: var(--color-green, #4ADE80);
  color: #0C0C0C;
  font-family: 'Inter', sans-serif;
  font-size: 0.9375rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 3px;
  transition: transform 0.15s ease, background 0.15s ease;
  white-space: nowrap;
}

.request-access-cta-button:hover {
  transform: translateY(-1px);
  background: #6BE89A;
}

.request-access-cta-arrow {
  font-size: 1.0625rem;
  transition: transform 0.15s ease;
}

.request-access-cta-button:hover .request-access-cta-arrow {
  transform: translateX(3px);
}

@media (max-width: 720px) {
  .request-access-cta {
    flex-direction: column;
    align-items: flex-start;
    padding: 1.75rem;
  }
  .request-access-cta-headline { font-size: 1.625rem; }
  .request-access-cta-button { width: 100%; justify-content: center; }
}

/* ============================
   SCREENSHOT GALLERY
   ============================ */
.screenshot-gallery {
  margin: 4rem 0 5rem;
}

.screenshot-gallery-intro {
  margin-bottom: 2.5rem;
}

.screenshot-gallery-heading {
  font-family: 'Instrument Serif', serif;
  font-size: clamp(2.25rem, 4vw, 3.25rem);
  font-weight: 400;
  line-height: 1.1;
  color: var(--color-fg, #E8E6E3);
  margin: 0.75rem 0 1rem;
}

.screenshot-gallery-body {
  font-size: 1.0625rem;
  line-height: 1.55;
  color: rgba(232, 230, 227, 0.65);
  margin: 0;
  max-width: 60ch;
}

.screenshot-figure {
  margin: 0 0 2rem;
  padding: 0;
  border: 1px solid rgba(232, 230, 227, 0.08);
  border-radius: 4px;
  overflow: hidden;
  background: #0F0F0F;
}

.screenshot-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-bottom: 1px solid rgba(232, 230, 227, 0.06);
}

.screenshot-figure figcaption {
  padding: 1rem 1.25rem 1.125rem;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.screenshot-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-green, #4ADE80);
}

.screenshot-caption {
  font-size: 0.9375rem;
  line-height: 1.5;
  color: rgba(232, 230, 227, 0.7);
}

.screenshot-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
  margin-bottom: 0;
}

.screenshot-row .screenshot-figure {
  margin-bottom: 2rem;
}

@media (max-width: 720px) {
  .screenshot-row { grid-template-columns: 1fr; gap: 0; }
}

/* ============================
   EXPLAINER VIDEO GALLERY (/platform/demo)
   ============================ */
.explainer-gallery {
  margin: 5rem 0 4rem;
  padding-top: 4rem;
  border-top: 1px solid rgba(232, 230, 227, 0.06);
}

.explainer-gallery-intro {
  margin-bottom: 2.5rem;
}

.explainer-gallery-heading {
  font-family: 'Instrument Serif', serif;
  font-size: clamp(2.25rem, 4vw, 3.25rem);
  font-weight: 400;
  line-height: 1.1;
  color: var(--color-fg, #E8E6E3);
  margin: 0.75rem 0 1rem;
}

.explainer-gallery-body {
  font-size: 1.0625rem;
  line-height: 1.55;
  color: rgba(232, 230, 227, 0.65);
  margin: 0;
  max-width: 60ch;
}

.explainer-figure {
  margin: 0 0 2rem;
  padding: 0;
  border: 1px solid rgba(232, 230, 227, 0.08);
  border-radius: 4px;
  overflow: hidden;
  background: #000;
}

.explainer-video {
  display: block;
  width: 100%;
  height: auto;
}

.explainer-figure figcaption {
  padding: 1rem 1.25rem 1.125rem;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  background: #0F0F0F;
  border-top: 1px solid rgba(232, 230, 227, 0.06);
}

.explainer-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-green, #4ADE80);
}

.explainer-caption {
  font-size: 0.9375rem;
  line-height: 1.5;
  color: rgba(232, 230, 227, 0.7);
}