/* ============================================
   LABS · DINA — Dual-Edition Token System
   Paper is source of truth. Dark overrides tokens.
   Vocabulary aligned to Dual-Edition doctrine.
   ============================================ */

:root {
  /* Core dual-edition tokens (paper defaults) */
  --ink: #1E262B;
  --ink-55: rgba(30, 38, 43, 0.64);
  --ink-30: rgba(30, 38, 43, 0.30);
  --paper: #FFFFFF;
  --tint: #FAFAFA;
  --deep: #11161C;
  --line: rgba(30, 38, 43, 0.12);
  --line-soft: rgba(30, 38, 43, 0.07);

  --accent: #C2410C;
  --accent-fill: #FB923C;
  --accent-soft: rgba(194, 65, 12, 0.12);
  --accent-glow: rgba(194, 65, 12, 0.28);

  --free: #16a34a;
  --taken: #dc2626;
  --unsure: #d97706;

  /* Derived / layout */
  --bg: var(--paper);
  --bg-elevated: var(--tint);
  --bg-card: #FFFFFF;
  --bg-deep: var(--deep);
  --text-primary: var(--ink);
  --text-secondary: var(--ink-55);
  --text-muted: rgba(30, 38, 43, 0.45);
  --border: var(--line);
  --border-subtle: var(--line-soft);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Orbitron', 'Inter', sans-serif;

  /* Spacing & radius */
  --radius: 10px;
  --radius-lg: 16px;
  --radius-sm: 6px;
  --nav-height: 68px;
  --max-w: 1200px;
}

/* Dark edition token overrides live in dark.css (loaded last) */

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
  transition: background 0.25s ease, color 0.25s ease;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-fill); }

img { max-width: 100%; height: auto; display: block; }

/* Particle Canvas */
#particle-canvas {
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 0.55;
}

html[data-edition="paper"] #particle-canvas { opacity: 0.28; }

/* ========== NAVIGATION ========== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  z-index: 1000;
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid var(--line-soft);
  transition: background 0.3s ease, border-color 0.3s ease;
}

.navbar.scrolled {
  background: color-mix(in srgb, var(--paper) 94%, transparent);
  border-bottom-color: var(--line);
}

.nav-container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.nav-logo {
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-badge {
  display: block;
  height: 1.35em;
  width: auto;
  transition: filter 0.25s ease, transform 0.25s ease;
}

.nav-logo:hover .nav-badge {
  transform: translateY(-1px);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 1.75rem;
  align-items: center;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

.nav-cta {
  background: var(--ink);
  color: var(--paper);
  border: none;
  padding: 0.55rem 1.15rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.15s ease;
}

.nav-cta:hover {
  background: var(--accent);
  transform: translateY(-1px);
}

/* Edition pill (strict anatomy) */
.ed-pill {
  display: inline-flex;
  align-items: center;
  gap: 0;
  background: var(--tint);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 3px;
  height: 32px;
}

.ed-pill__seg {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 26px;
  border-radius: 999px;
  color: var(--text-secondary);
  text-decoration: none;
  transition: background 0.2s ease, color 0.2s ease;
}

.ed-pill__seg.is-on {
  background: var(--ink);
  color: var(--paper);
  cursor: default;
  pointer-events: none;
}

.ed-pill__seg:not(.is-on):hover {
  background: var(--line-soft);
  color: var(--text-primary);
}

.ed-pill__i {
  display: block;
  flex-shrink: 0;
}

.ed-vh {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 0.4rem;
}

/* ========== HERO ========== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-height) + 3rem) 1.5rem 4rem;
  z-index: 1;
}

.hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 3rem;
  align-items: center;
}

.hero-visual {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--tint);
  border: 1px solid var(--line);
  aspect-ratio: 4/3;
}

.hero-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.shuffle-pill {
  position: absolute;
  bottom: 1rem;
  right: 1rem;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(8px);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.4rem 0.85rem;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
  transition: background 0.2s ease;
}

.shuffle-pill:hover {
  background: var(--paper);
}

.hero-content {
  max-width: 520px;
}

.hero-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 4.5vw, 3.1rem);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.hero-desc {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 1.75rem;
  max-width: 42ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.7rem 1.35rem;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.15s ease, box-shadow 0.2s ease;
  text-decoration: none;
}

.btn-primary {
  background: var(--ink);
  color: var(--paper);
}

.btn-primary:hover {
  background: var(--accent);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--line);
}

.btn-ghost:hover {
  background: var(--tint);
  border-color: var(--ink-30);
}

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.85rem;
  background: var(--tint);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-primary);
  text-decoration: none;
  transition: border-color 0.2s ease, background 0.2s ease;
}

.pill:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.pill-accent {
  background: var(--accent-soft);
  border-color: color-mix(in srgb, var(--accent) 35%, transparent);
}

.pill-icon {
  width: 14px;
  height: 14px;
  opacity: 0.85;
}

/* ========== METRICS ========== */
.metrics {
  position: relative;
  z-index: 1;
  padding: 2.5rem 1.5rem;
  background: var(--tint);
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.metrics-grid {
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1.5rem;
  text-align: center;
}

.metric-item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.metric-value {
  font-family: var(--font-display);
  font-size: 1.65rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: -0.02em;
}

.metric-label {
  font-size: 0.78rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ========== SECTIONS ========== */
.section {
  position: relative;
  z-index: 1;
  padding: 5rem 1.5rem;
}

.container {
  max-width: var(--max-w);
  margin: 0 auto;
}

.section-header {
  margin-bottom: 2.75rem;
  max-width: 640px;
}

.section-tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.6rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 3.2vw, 2.35rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 0.75rem;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 1.02rem;
}

/* ========== ABOUT ========== */
.about-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3rem;
  align-items: start;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  font-size: 1.02rem;
}

.stats-row {
  display: flex;
  gap: 2rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line-soft);
}

.stat-number {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--text-primary);
  display: block;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.visual-card {
  background: var(--tint);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  position: relative;
  overflow: hidden;
}

.visual-content h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
}

.pillars {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
}

.pillars li {
  display: flex;
  gap: 0.85rem;
  align-items: flex-start;
}

.pillar-icon {
  color: var(--accent);
  font-size: 0.9rem;
  margin-top: 0.15rem;
}

.pillars strong {
  display: block;
  font-size: 0.92rem;
  margin-bottom: 0.2rem;
  color: var(--text-primary);
}

.pillars p {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin: 0;
}

/* ========== LOGO LAB WORKSPACE (Phase 1/2) ========== */
.lab-workspace {
  display: grid;
  grid-template-columns: 280px 1fr 260px;
  gap: 1.25rem;
  min-height: 640px;
}

.lab-panel {
  background: var(--tint);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 1.15rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  overflow: hidden;
}

.lab-panel h3 {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 0.15rem;
}

.lab-panel label {
  display: block;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.3rem;
}

.lab-panel input[type="text"],
.lab-panel input[type="number"],
.lab-panel select,
.lab-panel textarea {
  width: 100%;
  padding: 0.5rem 0.65rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--paper);
  color: var(--text-primary);
  font-size: 0.88rem;
  font-family: inherit;
  transition: border-color 0.15s ease;
}

.lab-panel input:focus,
.lab-panel select:focus,
.lab-panel textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.lab-panel textarea {
  resize: vertical;
  min-height: 64px;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.chip {
  display: inline-flex;
  align-items: center;
  padding: 0.28rem 0.6rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.75rem;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease;
  user-select: none;
}

.chip.is-on {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.chip:hover:not(.is-on) {
  border-color: var(--accent);
}

.param-group {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.param-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.param-row label {
  margin: 0;
  flex: 1;
}

.param-row input[type="range"] {
  width: 100px;
  accent-color: var(--accent);
}

.param-val {
  font-size: 0.75rem;
  font-variant-numeric: tabular-nums;
  color: var(--text-muted);
  min-width: 2.2rem;
  text-align: right;
}

.lab-canvas-wrap {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  min-height: 0;
}

.lab-canvas-stage {
  flex: 1;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  min-height: 380px;
  overflow: hidden;
}

#mark-canvas {
  max-width: 100%;
  max-height: 100%;
  display: block;
}

.canvas-label {
  position: absolute;
  top: 0.6rem;
  left: 0.75rem;
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.ground-toggles {
  display: flex;
  gap: 0.35rem;
  flex-wrap: wrap;
}

.ground-btn {
  padding: 0.3rem 0.55rem;
  font-size: 0.72rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--paper);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s ease;
}

.ground-btn.is-on {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.size-ladder {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.size-swatch {
  width: 36px;
  height: 36px;
  border: 1px solid var(--line);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--paper);
  overflow: hidden;
}

.size-swatch canvas {
  image-rendering: pixelated;
}

.lab-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: auto;
  padding-top: 0.75rem;
  border-top: 1px solid var(--line-soft);
}
.lab-actions--unified {
  margin-top: auto;
}

.btn-sm {
  padding: 0.45rem 0.85rem;
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--paper);
  color: var(--text-primary);
  cursor: pointer;
  font-weight: 500;
  transition: background 0.15s ease, border-color 0.15s ease;
}

.btn-sm:hover {
  background: var(--tint);
  border-color: var(--accent);
}

.btn-sm.primary {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.btn-sm.primary:hover {
  background: var(--accent);
  border-color: var(--accent);
}

.direction-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  max-height: 180px;
  overflow-y: auto;
}

.direction-item {
  padding: 0.5rem 0.65rem;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  cursor: pointer;
  transition: border-color 0.15s ease;
}

.direction-item:hover,
.direction-item.is-active {
  border-color: var(--accent);
}

.direction-item strong {
  display: block;
  font-size: 0.8rem;
  margin-bottom: 0.15rem;
}

.direction-item span {
  font-size: 0.72rem;
  color: var(--text-muted);
}

.honesty-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-style: italic;
  margin-top: 0.35rem;
}

/* ========== FIELD NOTES ========== */
.insights-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.insight-card {
  background: var(--tint);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.35rem;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.insight-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.insight-date {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.insight-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.insight-card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 0.85rem;
}

.insight-link {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent);
}

/* ========== CONNECT ========== */
.connect-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: start;
}

.connect-info p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.connect-details {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.detail-label {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 0.2rem;
}

.connect-form {
  background: var(--tint);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.form-group label {
  display: block;
  font-size: 0.82rem;
  font-weight: 500;
  margin-bottom: 0.35rem;
  color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 0.65rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--paper);
  color: var(--text-primary);
  font-size: 0.92rem;
  font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
}

/* iOS Safari zooms the page on any input below 16px — hold the floor on touch. */
@media (pointer: coarse) {
  .form-group input,
  .form-group textarea { font-size: 16px; }
}

/* Honeypot — off-screen rather than display:none so bots still fill it. */
.hp-field {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.form-status {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--text-secondary);
  min-height: 1.2em;
}
.form-status:empty { display: none; }
.form-status.is-ok { color: var(--accent); }
.form-status.is-error { color: #b91c1c; }
.form-status a { font-weight: 500; text-decoration: underline; }

.full-width { width: 100%; justify-content: center; }

/* ========== FOOTER ========== */
.footer {
  position: relative;
  z-index: 1;
  padding: 2.5rem 1.5rem;
  border-top: 1px solid var(--line-soft);
  background: var(--tint);
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

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

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

.footer-links a {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

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

/* ========== RESPONSIVE ========== */
@media (max-width: 980px) {
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .lab-workspace {
    grid-template-columns: 1fr;
  }
  .about-grid,
  .connect-wrapper {
    grid-template-columns: 1fr;
  }
  .metrics-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .insights-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 640px) {
  .nav-links {
    display: none;
  }
  .mobile-toggle {
    display: block;
  }
  .metrics-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .insights-grid {
    grid-template-columns: 1fr;
  }
  .hero {
    padding-top: calc(var(--nav-height) + 2rem);
  }
  .section {
    padding: 3.5rem 1.25rem;
  }
}

@media (max-width: 380px) {
  .nav-badge {
    height: 1.15em;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  #particle-canvas { display: none; }
}

/* Interaction feedback (P3) */
.btn-sm.is-flash,
button.is-flash {
  transform: scale(0.97);
  box-shadow: 0 0 0 3px var(--accent-soft);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
#btn-negspace.is-on {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: var(--accent);
}

/* Keep lab controls snappy even under load */
.lab-controls input[type="range"],
.lab-controls input[type="number"],
.lab-controls select {
  touch-action: manipulation;
}
.lab-canvas-stage {
  will-change: contents;
}

/* ===== Geometry Engine v2 — Logo Integration (interactive) ===== */
.logo-ref-strip {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  padding: 0.45rem 0.6rem;
  margin-top: 0.4rem;
  background: var(--tint, #f4f5f7);
  border-radius: 12px;
  border: 1px solid var(--line, rgba(0,0,0,0.06));
}
.logo-ref-btn {
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
  border: 1.5px solid transparent;
  border-radius: 8px;
  padding: 5px 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
  line-height: 0;
}
.logo-ref-btn:hover {
  background: rgba(0, 0, 0, 0.045);
  border-color: rgba(0, 0, 0, 0.1);
  transform: translateY(-1px);
}
.logo-ref-btn:active {
  transform: translateY(0);
}
.logo-ref-btn:focus-visible {
  outline: 2px solid #FF7A1A;
  outline-offset: 2px;
}
.logo-ref-btn.is-active {
  background: rgba(255, 122, 26, 0.12);
  border-color: #FF7A1A;
  box-shadow: 0 0 0 1px rgba(255, 122, 26, 0.25);
}
.logo-ref-btn img {
  object-fit: contain;
  max-height: 34px;
  width: auto;
  filter: drop-shadow(0 1px 2px rgba(0,0,0,0.1));
  border-radius: 3px;
  pointer-events: none;
  display: block;
}
.logo-ref-btn .logo-ref-wordmark {
  max-height: 20px;
  /* source PNG is near-white (#F0F2F5); darken for paper edition */
  filter: brightness(0.18) drop-shadow(0 1px 1px rgba(0,0,0,0.12));
}
[data-dark] .logo-ref-strip,
[data-edition="dark"] .logo-ref-strip {
  background: rgba(255,255,255,0.04);
  border-color: rgba(255,255,255,0.08);
}
[data-dark] .logo-ref-btn:hover,
[data-edition="dark"] .logo-ref-btn:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.14);
}
[data-dark] .logo-ref-btn.is-active,
[data-edition="dark"] .logo-ref-btn.is-active {
  background: rgba(255, 122, 26, 0.18);
  border-color: #FF7A1A;
}
[data-dark] .logo-ref-btn .logo-ref-wordmark,
[data-edition="dark"] .logo-ref-btn .logo-ref-wordmark {
  /* restore near-white for dark backgrounds */
  filter: brightness(1) drop-shadow(0 1px 2px rgba(0,0,0,0.45));
}
.param-row select {
  font-size: 0.82rem;
  padding: 0.25rem 0.4rem;
  border-radius: 6px;
  border: 1px solid var(--line, #d0d5dd);
  background: var(--paper, #fff);
  color: var(--ink, #1e262b);
}
[data-dark] .param-row select,
[data-edition="dark"] .param-row select {
  background: var(--deep, #1a222c);
  border-color: rgba(255,255,255,0.12);
  color: var(--ink, #f5f7fa);
}
.param-row input[type="checkbox"] {
  accent-color: #FF7A1A;
  width: 16px;
  height: 16px;
  cursor: pointer;
}
#btn-preset-lab, #btn-preset-labs {
  font-size: 0.78rem;
}
.lab-actions {
  flex-wrap: wrap;
}

/* ===== Geometry Engine v3 — Artistry + Logo Embed ===== */
.param-divider {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent, #FF7A1A);
  margin: 0.85rem 0 0.35rem;
  padding-top: 0.55rem;
  border-top: 1px solid var(--line, rgba(0,0,0,0.07));
  opacity: 0.92;
}
[data-dark] .param-divider,
[data-edition="dark"] .param-divider {
  border-top-color: rgba(255,255,255,0.09);
}

.logo-strip-hint {
  margin: 0.55rem 0 0.15rem;
  font-size: 0.72rem;
  line-height: 1.35;
  text-align: center;
  color: var(--muted, #5c6570);
  opacity: 0.9;
  letter-spacing: 0.01em;
}
[data-dark] .logo-strip-hint,
[data-edition="dark"] .logo-strip-hint {
  color: rgba(245,247,250,0.55);
}

.logo-ref-strip {
  margin-top: 0.25rem;
  gap: 0.65rem;
  padding: 0.55rem 0.7rem;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.logo-ref-btn {
  padding: 6px 10px;
  border-radius: 10px;
}
.logo-ref-btn.is-active {
  transform: translateY(-1px);
}
.logo-ref-btn img {
  max-height: 36px;
  transition: transform 0.18s ease;
}
.logo-ref-btn:hover img {
  transform: scale(1.06);
}
.logo-ref-btn.is-active img {
  transform: scale(1.04);
}

/* Slightly tighter param rows for denser but clearer artistry panel */
.param-group .param-row {
  margin-bottom: 0.28rem;
}
.param-group .param-divider + .param-row {
  margin-top: 0.15rem;
}

/* Canvas label can be longer with logo info */
.canvas-label {
  font-size: 0.72rem;
  letter-spacing: 0.02em;
  max-width: 92%;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ===== Redesign: cohesion + True Random + Logo Insert + Mobile perfection ===== */

/* Collapsible panels — minimal & perfect */
.lab-collapse {
  border: 1px solid var(--line);
  border-radius: 10px;
  margin-bottom: 0.7rem;
  background: var(--tint);
  overflow: hidden;
  transition: border-color 0.15s ease;
}
.lab-collapse:hover {
  border-color: color-mix(in srgb, var(--accent) 35%, var(--line));
}
.lab-collapse[open] {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
}
.lab-collapse-summary {
  padding: 0.6rem 0.85rem;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-primary);
  user-select: none;
  -webkit-user-select: none;
  gap: 0.5rem;
}
.lab-collapse-summary::-webkit-details-marker {
  display: none;
}
.lab-collapse-summary::marker {
  content: '';
}
.lab-collapse-summary::after {
  content: '+';
  font-size: 1.05rem;
  font-weight: 400;
  line-height: 1;
  opacity: 0.5;
  flex-shrink: 0;
  transition: transform 0.18s ease, opacity 0.18s ease;
}
.lab-collapse[open] > .lab-collapse-summary::after {
  content: '−';
  opacity: 0.75;
}
.lab-collapse-body {
  padding: 0.15rem 0.85rem 0.9rem;
  border-top: 1px solid var(--line-soft);
}
.lab-collapse .collapse-h3 {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin: 0 0 0.4rem;
  opacity: 0.9;
}
.lab-collapse .param-group {
  gap: 0.55rem;
}
.lab-collapse .param-divider {
  margin-top: 0.7rem;
}

/* Unified action bar — minimal cohesive layout */
.lab-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  padding-top: 0.35rem;
}
.lab-actions--unified {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-top: 0.35rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--line);
}
.lab-actions-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  width: 100%;
}
.lab-actions--primary {
  margin-top: 0;
  border-top: none;
  padding-top: 0;
}
.lab-actions--presets {
  margin-top: 0;
  padding-top: 0;
  border: none;
}
.lab-actions--presets .btn-sm {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 0.78rem;
  opacity: 0.92;
}
.lab-actions--primary .btn-sm {
  flex: 1 1 auto;
  min-width: 0;
}
.btn-true-random {
  background: linear-gradient(135deg, #FC6801 0%, #e85a00 100%) !important;
  color: #fff !important;
  border-color: transparent !important;
  font-weight: 600;
  letter-spacing: 0.02em;
  box-shadow: 0 2px 8px rgba(252, 104, 1, 0.28);
  flex: 1.35 1 auto !important;
}
.btn-true-random:hover {
  filter: brightness(1.06);
  box-shadow: 0 4px 14px rgba(252, 104, 1, 0.38);
}
.btn-true-random.is-flash {
  box-shadow: 0 0 0 3px rgba(252, 104, 1, 0.35);
}

/* Logo Insert card — cohesive block */
.logo-insert-card {
  background: var(--tint);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 0.85rem 0.95rem 0.95rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}
.logo-insert-header {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.logo-insert-title {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-secondary);
}
.logo-insert-sub {
  font-size: 0.72rem;
  color: var(--text-muted);
  line-height: 1.35;
}
.logo-ref-strip {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  flex-wrap: wrap;
  gap: 0.45rem;
  padding: 0.5rem 0.55rem;
  background: var(--paper);
  border-radius: 10px;
  border: 1px solid var(--line);
}
.logo-ref-btn {
  appearance: none;
  -webkit-appearance: none;
  background: transparent;
  border: 1.5px solid transparent;
  border-radius: 8px;
  padding: 6px 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
  transition: border-color 0.15s ease, background 0.15s ease, transform 0.12s ease;
}
.logo-ref-btn:hover {
  border-color: var(--accent);
  background: var(--accent-soft, rgba(252,104,1,0.08));
}
.logo-ref-btn.is-active {
  border-color: var(--accent);
  background: var(--accent-soft, rgba(252,104,1,0.12));
  box-shadow: 0 0 0 1px var(--accent);
}
.logo-ref-btn img {
  display: block;
  max-height: 36px;
  width: auto;
  object-fit: contain;
}
.logo-upload-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  align-items: center;
}
.logo-upload-row .btn-sm {
  min-height: 40px;
}

/* Param divider polish */
.param-divider {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0.55rem 0 0.2rem;
  padding-bottom: 0.25rem;
  border-bottom: 1px dashed var(--line);
}

/* Honesty label quieter */
.honesty-label {
  font-size: 0.68rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
  line-height: 1.4;
}

/* ===== Mobile perfection ===== */
@media (max-width: 980px) {
  .lab-workspace {
    grid-template-columns: 1fr;
    gap: 1rem;
    min-height: 0;
  }
  .lab-panel {
    padding: 1rem;
    border-radius: 14px;
  }
  .lab-canvas-wrap {
    order: -1; /* canvas first on mobile for immediate visual feedback */
  }
  .lab-canvas-stage {
    min-height: 280px;
  }
  .lab-canvas-stage canvas {
    width: 100% !important;
    height: auto !important;
    max-width: 100%;
  }
  .param-row {
    flex-wrap: wrap;
    gap: 0.35rem 0.5rem;
  }
  .param-row label {
    flex: 1 1 100%;
    margin-bottom: 0.1rem;
  }
  .param-row input[type="range"] {
    width: 100%;
    flex: 1 1 auto;
    min-width: 0;
    height: 28px;
  }
  .param-row select,
  .param-row input[type="number"] {
    width: 100%;
    min-height: 42px;
    font-size: 1rem;
  }
  .param-val {
    min-width: 2.4rem;
  }
  .lab-actions {
    gap: 0.5rem;
  }
  .lab-actions--unified {
    gap: 0.45rem;
  }
  .lab-actions-row {
    gap: 0.45rem;
  }
  .lab-actions .btn-sm {
    flex: 1 1 auto;
    min-height: 44px;
    padding: 0.65rem 0.9rem;
    font-size: 0.9rem;
    justify-content: center;
  }
  .btn-true-random {
    flex: 1 1 100% !important;
    order: -1;
  }
  .lab-actions--primary {
    display: flex;
    flex-wrap: wrap;
  }
  .lab-actions--primary .btn-sm:not(.btn-true-random) {
    flex: 1 1 45%;
  }
  .lab-collapse-summary {
    min-height: 44px;
    padding: 0.7rem 0.9rem;
    font-size: 0.78rem;
  }
  .logo-insert-card {
    padding: 0.9rem;
  }
  .logo-ref-btn {
    min-height: 48px;
    min-width: 48px;
    padding: 8px 10px;
  }
  .ground-toggles {
    flex-wrap: wrap;
    gap: 0.35rem;
  }
  .ground-btn {
    min-height: 40px;
    padding: 0.45rem 0.7rem;
    font-size: 0.82rem;
  }
  .chip {
    min-height: 36px;
    padding: 0.4rem 0.75rem;
    font-size: 0.8rem;
  }
  .size-ladder {
    justify-content: center;
  }
}

@media (max-width: 640px) {
  .section {
    padding: 2.75rem 1rem;
  }
  .lab-workspace {
    gap: 0.85rem;
  }
  .lab-panel h3 {
    font-size: 0.74rem;
  }
  .hero-title {
    font-size: clamp(1.7rem, 7vw, 2.4rem);
  }
  .nav-container {
    padding-left: 1rem;
    padding-right: 1rem;
  }
  /* Better mobile nav dropdown */
  .nav-links {
    /* kept; JS still toggles */
  }
  .logo-upload-row .btn-sm {
    flex: 1 1 auto;
    min-height: 44px;
  }
  .lab-actions--presets .btn-sm {
    flex: 1 1 45%;
  }
  .lab-actions--unified {
    gap: 0.4rem;
  }
}

@media (max-width: 420px) {
  .lab-actions .btn-sm {
    font-size: 0.85rem;
    padding: 0.55rem 0.7rem;
  }
  .logo-ref-strip {
    gap: 0.35rem;
    padding: 0.4rem;
  }
  .logo-ref-btn img {
    max-height: 30px;
  }
}

/* Touch-friendly range thumbs */
input[type="range"] {
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}
.btn-sm,
.logo-ref-btn,
.chip,
.ground-btn {
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

/* ============ Engine v4 — primary controls, contexts, compare ============ */
.engine-primary { display: flex; flex-direction: column; gap: 0.55rem; }
.engine-primary h3 { margin-bottom: 0.15rem; }

.mode-pills { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.mode-pill {
  border: 1px solid var(--ink-30);
  background: var(--bg-card);
  color: var(--text-secondary);
  font: 500 0.72rem/1 inherit;
  font-family: inherit;
  letter-spacing: 0.02em;
  padding: 0.42rem 0.6rem;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.15s ease;
}
.mode-pill:hover { color: var(--text-primary); border-color: var(--ink-55); }
.mode-pill.is-on {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.seed-nav { display: flex; align-items: center; gap: 0.3rem; }
.seed-nav input { width: 76px; }
.seed-step { padding: 0.3rem 0.55rem; line-height: 1; }
.seed-step:disabled { opacity: 0.35; cursor: default; }
.param-hint { font-size: 0.68rem; color: var(--text-secondary); opacity: 0.8; }

.quality-chips { display: flex; gap: 0.4rem; flex-wrap: wrap; min-height: 1.4rem; }
.q-chip {
  font-size: 0.68rem;
  letter-spacing: 0.03em;
  color: var(--text-secondary);
  border: 1px solid var(--ink-30);
  border-radius: 999px;
  padding: 0.18rem 0.55rem;
  background: var(--bg-card);
}

.canvas-actionbar {
  display: flex; flex-wrap: wrap; align-items: center; gap: 0.45rem;
  padding: 0.6rem;
  border: 1px solid var(--ink-30);
  border-radius: 12px;
  background: var(--bg-card);
}
.kbd-hint { margin-left: auto; font-size: 0.66rem; color: var(--text-secondary); opacity: 0.75; display: flex; gap: 0.2rem; align-items: center; }
.kbd-hint kbd {
  border: 1px solid var(--ink-30); border-bottom-width: 2px; border-radius: 4px;
  padding: 0 0.28rem; font-size: 0.62rem; font-family: inherit;
}

.sheet-head { display: flex; justify-content: space-between; align-items: center; margin: 0.4rem 0; font-size: 0.75rem; color: var(--text-secondary); }
.contact-sheet { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.5rem; }
.sheet-cell {
  position: relative; border: 1px solid var(--ink-30); border-radius: 10px;
  background: var(--bg-card); padding: 0; overflow: hidden; cursor: pointer;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.sheet-cell:hover { border-color: var(--accent); transform: translateY(-2px); }
.sheet-cell canvas { display: block; width: 100%; height: auto; }
.sheet-cell span {
  position: absolute; left: 6px; bottom: 4px;
  font-size: 0.62rem; color: var(--text-secondary);
  background: var(--bg-card); border-radius: 4px; padding: 0 0.3rem; opacity: 0.9;
}

.context-strip {
  display: flex; flex-wrap: wrap; gap: 0.75rem; align-items: flex-end;
  border: 1px solid var(--ink-30); border-radius: 12px;
  background: var(--bg-card); padding: 0.7rem;
}
.ctx-cell { display: flex; flex-direction: column; align-items: center; gap: 0.3rem; }
.ctx-cell span { font-size: 0.64rem; letter-spacing: 0.05em; text-transform: uppercase; color: var(--text-secondary); }
.ctx-cell--edition canvas { border-radius: 10px; border: 1px solid var(--ink-30); }
.ctx-tab {
  display: flex; align-items: center; gap: 0.4rem;
  border: 1px solid var(--ink-30); border-bottom: none;
  border-radius: 9px 9px 0 0; padding: 0.32rem 0.7rem;
  background: var(--tint); font-size: 0.66rem; color: var(--text-secondary);
}
.ctx-tab i { font-style: normal; white-space: nowrap; }
.ctx-tab canvas { border-radius: 3px; }
.ctx-app { border-radius: 22.5%; box-shadow: 0 2px 8px rgba(0,0,0,0.18); }
.ctx-avatar { border-radius: 50%; border: 1px solid var(--ink-30); }

.direction-item--rich { display: flex; align-items: center; gap: 0.55rem; }
.direction-thumb { border-radius: 8px; border: 1px solid var(--ink-30); flex: 0 0 auto; }
.direction-meta { min-width: 0; display: flex; flex-direction: column; gap: 0.12rem; }
.direction-meta span { font-size: 0.68rem; }
.direction-pick {
  margin-left: auto; flex: 0 0 auto;
  width: 18px; height: 18px; border-radius: 6px;
  border: 1.5px solid var(--ink-30); background: transparent; cursor: pointer;
  transition: all 0.15s ease;
}
.direction-item.is-picked .direction-pick { background: var(--accent); border-color: var(--accent); }
.direction-item.is-picked { outline: 1.5px solid var(--accent); outline-offset: 1px; }

.compare-overlay {
  position: fixed; inset: 0; z-index: 300;
  background: rgba(10, 14, 18, 0.55); backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center; padding: 1.2rem;
}
.compare-panel {
  background: var(--bg); border: 1px solid var(--ink-30); border-radius: 16px;
  padding: 1.1rem; max-width: min(1100px, 96vw); max-height: 92vh; overflow: auto;
}
.compare-head { display: flex; justify-content: space-between; align-items: center; gap: 1rem; margin-bottom: 0.9rem; }
.compare-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; }
.compare-slot { display: flex; flex-direction: column; align-items: center; gap: 0.5rem; }
.compare-slot canvas { border-radius: 12px; border: 1px solid var(--ink-30); max-width: 100%; height: auto; }
.compare-slot .compare-16 { width: 16px; height: 16px; border-radius: 3px; }
.compare-slot p { font-size: 0.72rem; color: var(--text-secondary); text-align: center; }

@media (max-width: 640px) {
  .contact-sheet { grid-template-columns: repeat(2, 1fr); }
  .kbd-hint { display: none; }
}