.dkg-root, .dkg-root[data-theme="dark"] {
      /* Mono — premium black-and-white edition */
      --bg: #08090b;
      --bg-card: rgba(18, 19, 22, 0.86);
      --bg-hover: rgba(28, 29, 33, 0.92);
      --bg-active: rgba(38, 40, 46, 0.94);
      --bg-input: rgba(14, 15, 18, 0.94);
      --border: rgba(255, 255, 255, 0.10);
      --border-light: rgba(255, 255, 255, 0.18);
      --text: #fafafa;
      --text-secondary: #b4b6bd;
      --text-muted: #6e7077;
      --cyan: #f4efe6;
      --cyan-dim: rgba(244, 239, 230, 0.08);
      --purple: #d8d8d8;
      --purple-dim: rgba(216, 216, 216, 0.06);
      --blue: #ffffff;
      --blue-dim: rgba(255, 255, 255, 0.07);
      --amber: #f4efe6;
      --amber-dim: rgba(244, 239, 230, 0.08);
      --chain-base: #ffffff;
      --chain-gnosis: #cccccc;
      --chain-neuro: #999999;
      --shadow: 0 24px 70px rgba(0, 0, 0, 0.55);
      --radius-sm: 12px;
      --radius-md: 18px;
      --radius-lg: 24px;
      --max-width: 1200px;
    }

    .dkg-root[data-theme="light"] {
      --bg: #f7f7f5;
      --bg-card: rgba(255, 255, 255, 0.94);
      --bg-hover: rgba(248, 248, 246, 0.97);
      --bg-active: rgba(238, 238, 234, 0.98);
      --bg-input: rgba(255, 255, 255, 0.98);
      --border: rgba(20, 22, 28, 0.10);
      --border-light: rgba(20, 22, 28, 0.18);
      --text: #0a0b0d;
      --text-secondary: #4a4d55;
      --text-muted: #7a7d85;
      --cyan: #1a1a1a;
      --cyan-dim: rgba(26, 26, 26, 0.06);
      --purple: #404040;
      --purple-dim: rgba(64, 64, 64, 0.05);
      --blue: #0a0b0d;
      --blue-dim: rgba(10, 11, 13, 0.06);
      --amber: #1a1a1a;
      --amber-dim: rgba(26, 26, 26, 0.06);
      --shadow: 0 24px 70px rgba(20, 22, 28, 0.08);
    }

    .dkg-root * { box-sizing: border-box; }
    .dkg-root { scroll-behavior: smooth; }
    .dkg-root {
      margin: 0;
      min-width: 320px;
      background:
        radial-gradient(circle at top right, rgba(255, 255, 255, 0.04), transparent 32%),
        radial-gradient(circle at top left, rgba(255, 255, 255, 0.025), transparent 28%),
        var(--bg);
      color: var(--text);
      font-family: 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
      font-size: 16px;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      text-rendering: optimizeLegibility;
      transition: background-color 0.25s ease, color 0.25s ease;
    }
    .dkg-root[data-theme="light"] {
      background:
        radial-gradient(circle at top right, rgba(20, 22, 28, 0.04), transparent 32%),
        radial-gradient(circle at top left, rgba(20, 22, 28, 0.025), transparent 28%),
        var(--bg);
    }
    .dkg-root::before {
      content: '';
      position: fixed;
      inset: 0;
      pointer-events: none;
      background-image:
        linear-gradient(rgba(255,255,255,0.028) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.028) 1px, transparent 1px);
      background-size: 36px 36px;
      mask-image: radial-gradient(circle at top, black 16%, transparent 78%);
      opacity: 0.2;
    }
    a { color: inherit; text-decoration: none; }
    img { max-width: 100%; display: block; }
    button { font: inherit; }
    code, pre, .mono {
      font-family: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    }
    .wrap {
      width: min(calc(100% - 32px), var(--max-width));
      margin: 0 auto;
    }
    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 20px;
      color: var(--cyan);
      font-size: 12px;
      font-weight: 600;
      letter-spacing: 0.12em;
      text-transform: uppercase;
    }
    .eyebrow::before {
      content: '';
      width: 34px;
      height: 1px;
      background: linear-gradient(90deg, transparent, var(--cyan));
    }

    /* ── Nav ── */
    .site-nav {
      position: sticky;
      top: 0;
      z-index: 50;
      border-bottom: 1px solid transparent;
      transition: background 0.2s ease, border-color 0.2s ease, backdrop-filter 0.2s ease;
    }
    .site-nav.scrolled {
      background: color-mix(in srgb, var(--bg-card) 86%, transparent);
      border-color: var(--border);
      backdrop-filter: blur(18px);
      -webkit-backdrop-filter: blur(18px);
    }
    .nav-inner {
      width: min(calc(100% - 24px), calc(var(--max-width) + 32px));
      margin: 0 auto;
      min-height: 108px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
    }
    .brand {
      display: flex;
      align-items: center;
      gap: 0;
      flex: 0 0 auto;
    }
    .brand img {
      height: 72px;
      width: auto;
      max-width: 220px;
      display: block;
      object-fit: contain;
      object-position: left center;
      flex: 0 0 auto;
      margin-right: -8px;
    }
    .brand small {
      color: var(--text-secondary);
      font-size: 13px;
      white-space: nowrap;
    }
    .brand-tag {
      display: inline-flex;
      align-items: center;
      padding: 4px 9px;
      border-radius: 999px;
      border: 1px solid var(--border);
      background: color-mix(in srgb, var(--cyan) 12%, transparent);
      color: var(--cyan);
      font-family: 'JetBrains Mono', ui-monospace, monospace;
      font-size: 11px;
      font-weight: 600;
      letter-spacing: 0.06em;
      text-transform: uppercase;
      line-height: 1;
      white-space: nowrap;
      flex: 0 0 auto;
    }
    .dkg-root[data-theme="light"] .brand-tag {
      background: color-mix(in srgb, var(--cyan) 14%, white);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 18px;
      flex-wrap: wrap;
      justify-content: flex-end;
    }
    .nav-links a:not(.btn):not(.theme-toggle) {
      color: var(--text-secondary);
      font-size: 14px;
      font-weight: 500;
      transition: color 0.15s ease;
    }
    .nav-links a:hover,
    .nav-links a:focus-visible { color: var(--text); }

    /* ── Shared button / chip styles ── */
    .theme-toggle,
    .btn,
    .chip,
    .code-tabs button {
      min-height: 44px;
      border-radius: 12px;
      border: 1px solid var(--border);
      background: var(--bg-hover);
      color: var(--text);
      cursor: pointer;
      transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
    }
    .theme-toggle {
      width: 44px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0;
    }
    .theme-toggle:hover,
    .btn:hover,
    .chip:hover,
    .code-tabs button:hover,
    .theme-toggle:focus-visible,
    .btn:focus-visible,
    .chip:focus-visible,
    .code-tabs button:focus-visible {
      transform: translateY(-1px);
      border-color: var(--border-light);
      outline: none;
    }
    .theme-toggle svg { width: 18px; height: 18px; }
    .sun { display: none; }
    .dkg-root[data-theme="light"] .sun { display: block; }
    .dkg-root[data-theme="light"] .moon { display: none; }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      padding: 0 18px;
      font-weight: 600;
      text-decoration: none;
      white-space: nowrap;
    }
    .btn-primary {
      border-color: transparent;
      background: var(--text);
      color: var(--bg);
      box-shadow: 0 1px 0 0 rgba(255, 255, 255, 0.18) inset, 0 12px 28px rgba(0, 0, 0, 0.35);
      letter-spacing: -0.005em;
    }
    .dkg-root[data-theme="light"] .btn-primary {
      box-shadow: 0 1px 0 0 rgba(255, 255, 255, 0.10) inset, 0 12px 28px rgba(20, 22, 28, 0.16);
    }
    .btn-primary:hover {
      transform: translateY(-1px);
      transition: transform 0.18s ease;
    }
    .btn-secondary {
      background: transparent;
      color: var(--text-secondary);
    }

    /* ── Sections ── */
    .dkg-root section {
      padding: 104px 0;
      position: relative;
    }
    .hero {
      padding-top: 64px;
      padding-bottom: 88px;
      position: relative;
      overflow: hidden;
    }
    .hero-bg {
      position: absolute;
      inset: 0;
      pointer-events: none;
      background:
        radial-gradient(60% 60% at 80% 30%, color-mix(in srgb, var(--purple) 10%, transparent) 0%, transparent 60%),
        radial-gradient(50% 50% at 20% 90%, color-mix(in srgb, var(--cyan) 8%, transparent) 0%, transparent 60%);
      opacity: 0.6;
      z-index: 0;
    }
    .hero .wrap { position: relative; z-index: 1; }
    .hero-grid {
      display: grid;
      grid-template-columns: minmax(0, 1fr);
      gap: 40px;
      align-items: stretch;
    }
    .hero-copy { text-align: center; }
    .hero-kicker {
      margin: 0 auto 14px;
      color: var(--text-secondary);
      font-size: 15px;
      font-weight: 500;
      letter-spacing: -0.01em;
      max-width: 40ch;
    }
    .hero-copy h1,
    .section-head h2,
    .cta-band h2 {
      margin: 0;
      font-family: 'Space Grotesk', 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
      font-weight: 500;
      letter-spacing: -0.035em;
      text-wrap: pretty;
      font-feature-settings: "ss01" on, "cv11" on;
    }
    .hero-copy h1 {
      font-size: clamp(2.85rem, 5.6vw, 4.4rem);
      line-height: 0.96;
      max-width: 16ch;
      margin: 0 auto 22px;
      font-weight: 400;
    }
    .hero-copy h1 strong {
      font-weight: 600;
      color: var(--text);
    }
    .hero-copy p {
      max-width: 60ch;
      margin: 0 auto 28px;
      color: var(--text-secondary);
      font-size: 1.08rem;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-bottom: 24px;
      justify-content: center;
    }
    .hero-note {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      color: var(--text-muted);
      font-size: 14px;
    }
    .hero-note span {
      padding: 8px 12px;
      border-radius: 999px;
      border: 1px solid var(--border);
      background: rgba(255,255,255,0.02);
    }

    /* ── Shared card base ── */
    .panel,
    .layer-card,
    .feature-card,
    .chain-card,
    .footer-card,
    .step-list li,
    .contrast-card {
      border: 1px solid var(--border);
      background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.015));
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      box-shadow: var(--shadow);
    }
    .dkg-root[data-theme="light"] .panel,
    .dkg-root[data-theme="light"] .layer-card,
    .dkg-root[data-theme="light"] .feature-card,
    .dkg-root[data-theme="light"] .chain-card,
    .dkg-root[data-theme="light"] .footer-card,
    .dkg-root[data-theme="light"] .step-list li,
    .dkg-root[data-theme="light"] .contrast-card {
      background: linear-gradient(180deg, rgba(255,255,255,0.95), rgba(247,249,252,0.98));
    }

    /* ── Code panels ── */
    .code-panel {
      border-radius: var(--radius-lg);
      overflow: hidden;
    }
    .code-topbar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      padding: 16px 20px;
      border-bottom: 1px solid var(--border);
      background: rgba(255,255,255,0.02);
    }
    .traffic {
      display: inline-flex;
      gap: 8px;
    }
    .traffic span {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      display: block;
      background: rgba(255,255,255,0.18);
    }
    .traffic span:nth-child(1) { background: rgba(255, 255, 255, 0.18); }
    .traffic span:nth-child(2) { background: rgba(255, 255, 255, 0.30); }
    .traffic span:nth-child(3) { background: var(--cyan); }
    .code-panel pre {
      margin: 0;
      padding: 24px 22px 22px;
      overflow: auto;
      font-size: 14px;
      line-height: 1.75;
      color: var(--text);
      background: rgba(1, 3, 7, 0.64);
    }
    .dkg-root[data-theme="light"] .code-panel pre {
      background: #0a0b0d;
      color: #fafafa;
    }
    .code-panel code { display: block; min-width: 100%; }
    .line { display: block; padding: 2px 12px; border-radius: 8px; transition: background 0.18s ease; }
    .line:hover, .line.active { background: rgba(255,255,255,0.07); }
    .comment { color: var(--text-muted); }
    .kw { color: var(--text); }
    .fn { color: var(--text); }
    .str { color: var(--text-secondary); }

    /* ── Section heads ── */
    .section-head {
      display: grid;
      grid-template-columns: minmax(0, 1fr) auto;
      gap: 24px;
      align-items: end;
      margin-bottom: 28px;
    }
    .section-head h2 {
      font-size: clamp(2rem, 4vw, 2.8rem);
      line-height: 1.04;
      margin-bottom: 12px;
    }
    .section-head p {
      max-width: 66ch;
      margin: 0;
      color: var(--text-secondary);
      font-size: 1rem;
    }

    /* ═══════════════════════════════════════════════════
       MEMORY LAYERS — Network Graph Visualization
       ═══════════════════════════════════════════════════ */

    .memory-viz-section {
      padding: 104px 0 80px;
    }

    .memory-viz-layout {
      display: grid;
      grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
      gap: 48px;
      align-items: center;
    }

/* ── Agent logos overlaid on the canvas (between Shared and Verified rings) ── */
    .agent-orbit {
      position: absolute;
      inset: 0;
      pointer-events: none;
    }
    .agent-logo {
      position: absolute;
      left: 50%;
      top: 50%;
      width: 42px;
      height: 42px;
      transform: translate(-50%, -50%);
      transition: opacity 0.3s ease, filter 0.3s ease;
      will-change: left, top;
      opacity: 0.85;
      color: #ffffff;
      overflow: visible;
      object-fit: contain;
      filter: drop-shadow(0 0 6px rgba(0, 0, 0, 0.6));
    }
    .agent-logo path,
    .agent-logo rect,
    .agent-logo circle,
    .agent-logo ellipse,
    .agent-logo polyline,
    .agent-logo line,
    .agent-logo polygon {
      vector-effect: non-scaling-stroke;
    }
    .agent-orbit.layer-shared .agent-logo {
      opacity: 1;
      filter: drop-shadow(0 0 10px rgba(216, 216, 216, 0.55));
    }

    /* ── Beaming OriginTrail mark at the center ── */
    .core-beacon {
      position: absolute;
      left: 50%;
      top: 50%;
      width: 64px;
      height: 64px;
      transform: translate(-50%, -50%);
      pointer-events: none;
      display: grid;
      place-items: center;
    }
    .core-beacon::before,
    .core-beacon::after {
      content: '';
      position: absolute;
      inset: 0;
      border-radius: 50%;
      border: 1px solid var(--blue);
      opacity: 0;
      animation: beacon-ring 6s ease-out infinite;
    }
    .core-beacon::after {
      animation-delay: 3s;
    }
    .core-beacon-glow {
      position: absolute;
      inset: -28%;
      border-radius: 50%;
      background: radial-gradient(circle, color-mix(in srgb, var(--blue) 28%, transparent) 0%, transparent 65%);
      animation: beacon-glow 6s ease-in-out infinite;
    }
    .core-beacon svg {
      position: relative;
      width: 64%;
      height: 64%;
      color: var(--blue);
      filter: drop-shadow(0 0 8px color-mix(in srgb, var(--blue) 55%, transparent));
      animation: beacon-pulse 6s ease-in-out infinite;
    }
    .core-beacon svg path { fill: currentColor; }

    @keyframes beacon-ring {
      0%   { transform: scale(0.8); opacity: 0.7; }
      80%  { transform: scale(8.4); opacity: 0; }
      100% { transform: scale(8.4); opacity: 0; }
    }
    @keyframes beacon-glow {
      0%, 100% { opacity: 0.55; transform: scale(1); }
      50%      { opacity: 0.95; transform: scale(1.18); }
    }
    @keyframes beacon-pulse {
      0%, 100% { transform: scale(1); }
      50%      { transform: scale(1.06); }
    }

    /* ── Canvas container ── */
    .memory-graph {
      position: relative;
      width: 100%;
      aspect-ratio: 1;
      max-width: 480px;
      margin: 0 auto;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .memory-graph canvas {
      width: 100%;
      height: 100%;
      display: block;
      cursor: pointer;
    }

    /* Layer zone labels overlaid on canvas — positioned relative to canvas center */
    .graph-zone-label {
      position: absolute;
      left: 50%;
      font-size: 10px;
      font-weight: 700;
      letter-spacing: 0.14em;
      text-transform: uppercase;
      pointer-events: none;
      opacity: 0.45;
      transition: opacity 0.35s ease, color 0.3s ease;
      background: color-mix(in srgb, var(--bg) 92%, transparent);
      padding: 3px 10px;
      border-radius: 999px;
      white-space: nowrap;
      border: 1px solid var(--border);
      backdrop-filter: blur(6px);
      -webkit-backdrop-filter: blur(6px);
    }
    .graph-zone-label.active {
      opacity: 1;
      border-color: color-mix(in srgb, currentColor 40%, var(--border));
    }
    .graph-zone-label .lbl-count {
      margin-left: 6px;
      opacity: 0.55;
      font-weight: 500;
    }
    /* Working — at top edge of innermost zone (radius 0.22) */
    .graph-zone-label--working {
      color: var(--blue);
      top: calc(50% - (50% * 0.94 * 0.22));
      transform: translate(-50%, -50%);
    }
    /* Shared — at top edge of middle zone (radius 0.46) */
    .graph-zone-label--shared {
      color: var(--purple);
      top: calc(50% - (50% * 0.94 * 0.46));
      transform: translate(-50%, -50%);
    }
    /* Verifiable — at top edge of outer zone (radius 0.78) */
    .graph-zone-label--verifiable {
      color: var(--cyan);
      top: calc(50% - (50% * 0.94 * 0.78));
      transform: translate(-50%, -50%);
    }

    /* Graph container — wider canvas + corner legend */
    .memory-graph {
      max-width: 560px !important;
    }
    .graph-corner-legend {
      position: absolute;
      bottom: 8px;
      left: 8px;
      display: flex;
      flex-direction: column;
      gap: 4px;
      font-size: 10px;
      letter-spacing: 0.08em;
      color: var(--text-muted);
      pointer-events: none;
      font-family: 'JetBrains Mono', ui-monospace, monospace;
    }
    .graph-corner-legend span { display: flex; align-items: center; gap: 6px; }
    .graph-corner-legend i {
      width: 8px; height: 8px; border-radius: 50%;
      display: inline-block; flex: 0 0 auto;
      box-shadow: 0 0 8px currentColor;
    }

    /* ── Tweaks panel (vanilla) ── */
    .tweaks-panel {
      position: fixed;
      right: 18px;
      bottom: 18px;
      z-index: 200;
      width: 280px;
      max-height: calc(100vh - 36px);
      overflow-y: auto;
      background: color-mix(in srgb, var(--bg-card) 96%, transparent);
      border: 1px solid var(--border-light);
      border-radius: 14px;
      box-shadow: 0 24px 60px rgba(0,0,0,0.45);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      font-size: 13px;
      color: var(--text);
      display: none;
    }
    .tweaks-panel.open { display: block; }
    .tweaks-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 14px;
      border-bottom: 1px solid var(--border);
      cursor: grab;
    }
    .tweaks-header h4 {
      margin: 0;
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: var(--text-secondary);
    }
    .tweaks-close {
      background: transparent;
      border: none;
      color: var(--text-muted);
      cursor: pointer;
      padding: 2px 6px;
      font-size: 16px;
      line-height: 1;
    }
    .tweaks-close:hover { color: var(--text); }
    .tweaks-body { padding: 8px 14px 14px; }
    .tweak-section {
      margin-top: 10px;
      padding-top: 10px;
      border-top: 1px dashed var(--border);
    }
    .tweak-section:first-child { border-top: none; padding-top: 0; }
    .tweak-section h5 {
      margin: 0 0 8px;
      font-size: 10px;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      color: var(--text-muted);
      font-weight: 700;
    }
    .tweak-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 12px;
      padding: 6px 0;
    }
    .tweak-row label {
      flex: 1;
      color: var(--text-secondary);
      font-size: 12px;
      cursor: pointer;
    }
    .tweak-row .tweak-val {
      color: var(--text-muted);
      font-family: 'JetBrains Mono', monospace;
      font-size: 11px;
      min-width: 38px;
      text-align: right;
    }
    .tweak-row input[type="range"] {
      flex: 1.4;
      accent-color: var(--cyan);
      height: 4px;
    }
    /* iOS-style toggle */
    .tweak-toggle {
      width: 36px; height: 20px;
      border-radius: 999px;
      background: var(--bg-active);
      border: 1px solid var(--border-light);
      position: relative;
      cursor: pointer;
      transition: background 0.18s ease;
      flex: 0 0 auto;
    }
    .tweak-toggle::after {
      content: '';
      position: absolute;
      width: 14px; height: 14px;
      border-radius: 50%;
      background: var(--text-secondary);
      top: 2px; left: 2px;
      transition: transform 0.18s ease, background 0.18s ease;
    }
    .tweak-toggle.on {
      background: color-mix(in srgb, var(--cyan) 35%, var(--bg-active));
      border-color: color-mix(in srgb, var(--cyan) 60%, var(--border-light));
    }
    .tweak-toggle.on::after {
      transform: translateX(16px);
      background: var(--cyan);
    }
    .tweak-segment {
      display: flex;
      gap: 0;
      border: 1px solid var(--border);
      border-radius: 8px;
      overflow: hidden;
      flex: 0 0 auto;
    }
    .tweak-segment button {
      background: transparent;
      border: none;
      color: var(--text-secondary);
      padding: 5px 9px;
      font-size: 11px;
      cursor: pointer;
      transition: background 0.15s ease, color 0.15s ease;
      min-height: auto;
      border-radius: 0;
    }
    .tweak-segment button + button { border-left: 1px solid var(--border); }
    .tweak-segment button.active {
      background: var(--cyan);
      color: var(--bg);
    }
    .tweak-toggle-fab {
      position: fixed;
      right: 18px;
      bottom: 18px;
      z-index: 199;
      width: 44px; height: 44px;
      border-radius: 12px;
      border: 1px solid var(--border-light);
      background: var(--bg-card);
      color: var(--text);
      cursor: pointer;
      display: none;
      align-items: center;
      justify-content: center;
      backdrop-filter: blur(20px);
      box-shadow: 0 12px 30px rgba(0,0,0,0.35);
    }
    .tweak-toggle-fab.visible { display: inline-flex; }
    .tweak-toggle-fab.hidden-by-panel { display: none; }
    .tweak-toggle-fab svg { width: 18px; height: 18px; }

    /* ── Layer detail cards (right side) ── */
    .layer-details {
      display: grid;
      gap: 16px;
    }

    .layer-card {
      border-radius: var(--radius-md);
      padding: 22px 24px;
      cursor: pointer;
      transition: transform 0.18s ease, border-color 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
      position: relative;
      overflow: hidden;
    }
    .layer-card::before {
      content: '';
      position: absolute;
      left: 0;
      top: 0;
      bottom: 0;
      width: 3px;
      background: var(--accent);
      opacity: 0;
      transition: opacity 0.3s ease;
    }
    .layer-card.active::before { opacity: 1; }
    .layer-card:hover {
      transform: translateY(-2px);
    }
    .layer-card.active {
      border-color: color-mix(in srgb, var(--accent) 55%, var(--border-light));
      box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
    }
    .layer-card.working { --accent: var(--blue); }
    .layer-card.shared { --accent: var(--purple); }
    .layer-card.verifiable { --accent: var(--cyan); }

    .layer-head {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 10px;
    }
    .layer-icon {
      width: 38px;
      height: 38px;
      border-radius: 10px;
      display: grid;
      place-items: center;
      border: 1px solid color-mix(in srgb, var(--accent) 40%, var(--border));
      background: color-mix(in srgb, var(--accent) 14%, transparent);
      color: var(--accent);
      flex: 0 0 auto;
    }
    .layer-icon svg { width: 18px; height: 18px; }
    .layer-card h3 {
      margin: 0;
      font-size: 1.05rem;
      line-height: 1.2;
    }
    .layer-card .layer-num {
      font-size: 12px;
      font-weight: 700;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      color: var(--accent);
      margin: 0 0 2px;
    }
    .layer-card p {
      margin: 0;
      color: var(--text-secondary);
      font-size: 14px;
      line-height: 1.55;
    }
    .layer-card .layer-detail {
      margin-top: 12px;
      padding-top: 12px;
      border-top: 1px solid var(--border);
      font-size: 13px;
      color: var(--text-muted);
      display: none;
    }
    .layer-card.active .layer-detail { display: block; }
    .layer-card .layer-detail strong {
      color: var(--text-secondary);
    }

    /* Trust meter */
    .trust-meter {
      display: flex;
      gap: 4px;
      margin-left: auto;
    }
    .trust-meter span {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      border: 1px solid color-mix(in srgb, var(--accent) 50%, var(--border-light));
      background: transparent;
      transition: background 0.3s ease;
    }
    .trust-meter span.filled { background: var(--accent); }

    /* ── Flow strip (below rings) ── */
    .flow-strip {
      margin-top: 48px;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 2px;
      border-radius: var(--radius-md);
      overflow: hidden;
    }
    .flow-step {
      padding: 20px 18px;
      background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
      border: 1px solid var(--border);
      text-align: center;
      position: relative;
    }
    .flow-step:first-child { border-radius: var(--radius-md) 0 0 var(--radius-md); }
    .flow-step:last-child { border-radius: 0 var(--radius-md) var(--radius-md) 0; }
    .flow-step em {
      display: block;
      font-style: normal;
      font-size: 11px;
      font-weight: 700;
      letter-spacing: 0.08em;
      text-transform: uppercase;
      margin-bottom: 6px;
    }
    .flow-step:nth-child(1) em { color: var(--amber); }
    .flow-step:nth-child(2) em { color: var(--blue); }
    .flow-step:nth-child(3) em { color: var(--purple); }
    .flow-step:nth-child(4) em { color: var(--cyan); }
    .flow-step strong {
      display: block;
      font-size: 14px;
      margin-bottom: 4px;
    }
    .flow-step span {
      font-size: 12px;
      color: var(--text-muted);
      line-height: 1.4;
    }
    .flow-arrow {
      position: absolute;
      right: -8px;
      top: 50%;
      transform: translateY(-50%);
      width: 14px;
      height: 14px;
      z-index: 2;
      color: var(--text-muted);
    }

    .dkg-root[data-theme="light"] .flow-step {
      background: linear-gradient(180deg, rgba(255,255,255,0.95), rgba(247,249,252,0.98));
    }

    /* ── Before/After contrast ── */
    .contrast-row {
      display: grid;
      grid-template-columns: 1fr auto 1fr;
      gap: 0;
      align-items: stretch;
      margin-top: 32px;
    }
    .contrast-card {
      border-radius: var(--radius-md);
      padding: 24px;
    }
    .contrast-card h4 {
      margin: 0 0 6px;
      font-size: 13px;
      font-weight: 700;
      letter-spacing: 0.08em;
      text-transform: uppercase;
    }
    .contrast-card.before h4 { color: var(--amber); }
    .contrast-card.after h4 { color: var(--cyan); }
    .contrast-card.before { border-color: color-mix(in srgb, var(--amber) 35%, var(--border)); }
    .contrast-card.after { border-color: color-mix(in srgb, var(--cyan) 35%, var(--border)); }
    .contrast-card strong {
      display: block;
      margin-bottom: 8px;
      font-size: 1.05rem;
    }
    .contrast-card p {
      margin: 0;
      color: var(--text-secondary);
      font-size: 14px;
    }
    .contrast-arrow {
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 0 20px;
      color: var(--text-muted);
    }
    .contrast-arrow svg { width: 28px; height: 28px; }

    /* ── Quickstart ── */
    .quickstart-section { padding-top: 80px; }
    .quickstart {
      display: grid;
      grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
      gap: 22px;
      align-items: start;
    }
    .code-tabs {
      display: flex;
      gap: 10px;
      margin-bottom: 14px;
    }
    .code-tabs button {
      min-height: 38px;
      padding: 0 14px;
      background: transparent;
      color: var(--text-secondary);
    }
    .code-tabs button.active {
      background: rgba(255,255,255,0.05);
      color: var(--text);
      border-color: var(--border-light);
    }
    .step-list {
      list-style: none;
      margin: 0;
      padding: 0;
      display: grid;
      gap: 12px;
    }
    .step-list li {
      border-radius: 16px;
      padding: 18px 18px 16px;
      position: relative;
      overflow: hidden;
    }
    .step-list li.active {
      border-color: var(--cyan);
      box-shadow: 0 0 0 1px rgba(244, 239, 230, 0.18) inset;
    }
    .step-list strong { display: block; margin-bottom: 4px; font-size: 15px; }
    .step-list p { font-size: 14px; margin: 0; color: var(--text-secondary); }
    .step-index {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 30px;
      height: 30px;
      margin-bottom: 12px;
      border-radius: 50%;
      background: rgba(255,255,255,0.06);
      color: var(--text);
      font-size: 13px;
      font-weight: 600;
    }
    .quickstart-copy h3 {
      margin: 0 0 12px;
      font-size: 1.16rem;
      line-height: 1.2;
    }
    .quickstart-copy p {
      margin: 0 0 16px;
      color: var(--text-secondary);
    }

    /* ── Features ── */
    .feature-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 20px;
    }
    .feature-card {
      border-radius: var(--radius-md);
      padding: 22px;
    }
    .feature-card h3 {
      margin: 0 0 12px;
      font-size: 1.05rem;
      line-height: 1.2;
    }
    .feature-card p {
      margin: 0;
      color: var(--text-secondary);
      font-size: 14px;
    }
    .feature-card code {
      display: inline-block;
      margin-top: 10px;
      padding: 6px 10px;
      border-radius: 999px;
      background: rgba(255,255,255,0.04);
      color: var(--text);
      font-size: 13px;
    }

    /* ── Agent picker (honcho-style integrations) ── */
    .agent-picker-section {
      position: relative;
      overflow: hidden;
    }
    .agent-picker-bg {
      position: absolute;
      inset: 0;
      pointer-events: none;
      background-image:
        radial-gradient(circle at 20% 30%, color-mix(in srgb, var(--cyan) 14%, transparent), transparent 45%),
        radial-gradient(circle at 80% 70%, color-mix(in srgb, var(--blue) 10%, transparent), transparent 50%);
      opacity: 0.5;
    }
    .agent-picker-bg::after {
      content: '';
      position: absolute;
      inset: 0;
      background-image:
        linear-gradient(to right, rgba(255,255,255,0.018) 1px, transparent 1px),
        linear-gradient(to bottom, rgba(255,255,255,0.018) 1px, transparent 1px);
      background-size: 28px 28px;
      mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
      -webkit-mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
    }
    .agent-picker {
      position: relative;
      max-width: 760px;
      margin: 0 auto;
      width: 100%;
      display: flex;
      flex-direction: column;
      align-items: stretch;
      gap: 14px;
    }
    .agent-tabs {
      display: flex;
      gap: 8px;
      justify-content: center;
      flex-wrap: wrap;
    }
    .agent-tab {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 10px 14px 10px 12px;
      min-height: 44px;
      border-radius: 999px;
      border: 1px solid var(--border);
      background: rgba(255,255,255,0.025);
      color: var(--text-secondary);
      cursor: pointer;
      transition: border-color 0.18s ease, background 0.18s ease, color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
      font: inherit;
    }
    .agent-tab:hover {
      border-color: var(--border-light);
      color: var(--text);
      background: rgba(255,255,255,0.045);
    }
    .agent-tab-icon {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 52px;
      height: 52px;
      border-radius: 50%;
      background: rgba(255,255,255,0.04);
      color: var(--text-secondary);
      flex-shrink: 0;
    }
    .agent-tab-icon svg { width: 28px; height: 28px; }
    .agent-tab-icon img { width: 28px; height: 28px; object-fit: contain; display: block; }
    .agent-tab-icon-row {
      width: auto;
      min-width: 112px;
      height: 52px;
      border-radius: 999px;
      padding: 0 16px;
      gap: 10px;
      background: rgba(255,255,255,0.04);
    }
    .agent-tab-icon-row img { width: 28px; height: 28px; }
    [data-theme="dark"] .agent-tab-icon img.invert-on-dark { filter: invert(1) brightness(1.4); }
    .dkg-root[data-theme="light"] .agent-tab-icon img.invert-on-light { filter: invert(1) brightness(0.8); }
    .agent-tab-label {
      display: inline-flex;
      flex-direction: column;
      align-items: flex-start;
      line-height: 1.05;
      font-size: 12px;
      font-weight: 600;
      letter-spacing: 0.04em;
      text-transform: uppercase;
      color: inherit;
    }
    .agent-tab-label small {
      font-size: 9.5px;
      font-weight: 500;
      letter-spacing: 0.08em;
      color: var(--text-muted, rgba(255,255,255,0.4));
      margin-top: 2px;
    }
    .agent-tab-caret {
      width: 12px;
      height: 12px;
      opacity: 0.5;
      flex-shrink: 0;
    }
    .agent-tab.active {
      color: var(--text);
      background: color-mix(in srgb, var(--cyan) 14%, rgba(255,255,255,0.04));
      border-color: color-mix(in srgb, var(--cyan) 55%, transparent);
      box-shadow:
        0 0 0 1px color-mix(in srgb, var(--cyan) 40%, transparent),
        0 0 28px color-mix(in srgb, var(--cyan) 28%, transparent),
        0 8px 24px rgba(0, 0, 0, 0.32);
    }
    .agent-tab.active .agent-tab-icon {
      background: color-mix(in srgb, var(--cyan) 25%, transparent);
      color: var(--cyan);
    }
    .agent-tab.active .agent-tab-caret { opacity: 0.85; }
    .agent-tagline {
      text-align: left;
      font-size: 13px;
      color: var(--text-secondary);
    }
    @media (max-width: 1100px) { .agent-tagline { text-align: center; } }
    .agent-tagline strong {
      color: var(--text);
      font-weight: 600;
    }
    .agent-tagline a {
      color: var(--text);
      border-bottom: 1px solid color-mix(in srgb, var(--text) 35%, transparent);
      padding-bottom: 1px;
      margin-left: 6px;
      transition: color 0.15s ease, border-color 0.15s ease;
    }
    .agent-tagline a:hover { color: var(--cyan); border-bottom-color: var(--cyan); }
    .agent-card {
      border-radius: 14px;
      border: 1px solid var(--border);
      background: rgba(8, 12, 20, 0.6);
      backdrop-filter: blur(8px);
      overflow: hidden;
    }
    .agent-card-head {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 12px 16px;
      border-bottom: 1px solid var(--border);
      font-family: var(--font-mono);
      font-size: 13px;
      color: var(--text-secondary);
    }
    .agent-copy {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 32px;
      height: 32px;
      border-radius: 8px;
      border: 1px solid transparent;
      background: transparent;
      color: var(--text-secondary);
      cursor: pointer;
      transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
    }
    .agent-copy:hover {
      background: rgba(255,255,255,0.05);
      color: var(--text);
      border-color: var(--border);
    }
    .agent-copy svg { width: 16px; height: 16px; }
    .agent-copy.copied { color: var(--cyan); }
    .agent-code {
      margin: 0;
      padding: 18px 18px 20px;
      font-family: var(--font-mono);
      font-size: 13.5px;
      line-height: 1.75;
      overflow-x: auto;
      color: var(--text-secondary);
    }
    .agent-code .ac-comment { color: var(--text-muted); }
    .agent-code .ac-cmd { color: var(--cyan); }
    .agent-code .ac-arg { color: var(--text-secondary); }
    .agent-code .ac-str { color: var(--text); }
    .agent-footnote {
      text-align: left;
      font-size: 12.5px;
      color: var(--text-muted, rgba(255,255,255,0.42));
      margin: 0;
    }

    @media (max-width: 720px) {
      .agent-tabs { gap: 8px; }
      .agent-tab { padding: 8px 12px; }
      .agent-tab-label small { display: none; }
    }

    /* ── Integrations (legacy chip-row, unused) ── */

    /* ── Chains ── */
    .chains-grid {
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: 20px;
    }
    .chain-card {
      border-radius: var(--radius-md);
      padding: 22px;
      display: grid;
      gap: 16px;
      min-height: 100%;
    }
    .chain-top {
      display: flex;
      align-items: center;
      gap: 14px;
    }
    .chain-logo {
      width: 44px;
      height: 44px;
      border-radius: 12px;
      display: grid;
      place-items: center;
      background: rgba(255,255,255,0.03);
      border: 1px solid var(--border);
      overflow: hidden;
      flex: 0 0 auto;
    }
    .chain-card.base .chain-logo {
      color: var(--text);
      background: color-mix(in srgb, var(--chain-base) 16%, transparent);
      border-color: color-mix(in srgb, var(--chain-base) 35%, var(--border));
    }
    .chain-card.gnosis .chain-logo {
      background: color-mix(in srgb, var(--chain-gnosis) 14%, transparent);
      border-color: color-mix(in srgb, var(--chain-gnosis) 35%, var(--border));
    }
    .chain-card.neuroweb .chain-logo {
      background: color-mix(in srgb, var(--chain-neuro) 14%, transparent);
      border-color: color-mix(in srgb, var(--chain-neuro) 35%, var(--border));
    }
    .chain-card img { width: 26px; height: 26px; object-fit: contain; }
    .chain-card h3 { margin: 0; font-size: 1.05rem; }
    .chain-card p { margin: 0; color: var(--text-secondary); font-size: 14px; }
    .chain-tag {
      display: inline-flex;
      align-items: center;
      width: fit-content;
      padding: 5px 10px;
      border-radius: 999px;
      font-size: 12px;
      font-weight: 600;
      letter-spacing: 0.06em;
      text-transform: uppercase;
      color: var(--text);
      border: 1px solid currentColor;
    }
    .chain-card.base .chain-tag { color: var(--chain-base); }
    .chain-card.gnosis .chain-tag { color: var(--chain-gnosis); }
    .chain-card.neuroweb .chain-tag { color: var(--chain-neuro); }

    /* ── CTA band ── */
    .cta-band {
      border-top: 1px solid var(--border);
      border-bottom: 1px solid var(--border);
      background: linear-gradient(90deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.08));
    }
    .cta-inner {
      display: grid;
      grid-template-columns: minmax(0, 1fr) auto;
      gap: 26px;
      align-items: center;
    }
    .cta-band h2 {
      font-size: clamp(2rem, 4vw, 3.1rem);
      margin-bottom: 14px;
    }
    .cta-band p {
      margin: 0;
      max-width: 54ch;
      color: var(--text-secondary);
      font-size: 1.02rem;
    }
    .cta-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: flex-end;
    }

    /* ── Footer ── */
    footer {
      padding: 36px 0 44px;
      color: var(--text-secondary);
    }
    .footer-shell {
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 36px 36px 30px;
      background: rgba(255,255,255,0.02);
    }
    .footer-top {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 18px;
      margin-bottom: 36px;
      flex-wrap: wrap;
    }
    .footer-brand {
      display: flex;
      align-items: center;
      gap: 18px;
    }
    .footer-brand img {
      height: 80px;
      width: 300px;
      display: block;
      object-fit: contain;
      object-position: left center;
      flex: 0 0 auto;
    }
    .footer-tagline {
      font-family: var(--font-display);
      font-size: 18px;
      font-weight: 600;
      letter-spacing: -0.01em;
      color: var(--text);
      line-height: 1.2;
    }
    .footer-version {
      font-family: var(--font-mono);
      font-size: 11px;
      letter-spacing: 0.14em;
      text-transform: uppercase;
      color: var(--text-secondary);
      padding: 8px 14px;
      border: 1px solid var(--border);
      border-radius: 999px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr repeat(3, minmax(0, 1fr));
      gap: 32px;
    }
    .footer-card h4 {
      margin: 0 0 14px;
      font-family: var(--font-mono);
      font-size: 11px;
      font-weight: 500;
      letter-spacing: 0.16em;
      text-transform: uppercase;
      color: var(--text-secondary);
    }
    .footer-card p {
      margin: 0;
      color: var(--text);
      font-size: 15px;
      line-height: 1.55;
      max-width: 36ch;
      text-wrap: pretty;
    }
    .footer-card ul {
      list-style: none;
      margin: 0;
      padding: 0;
      display: grid;
      gap: 12px;
    }
    .footer-card li {
      font-size: 15px;
      line-height: 1.4;
    }
    .footer-card a {
      color: var(--text);
      text-decoration: none;
      transition: color 0.15s ease;
    }
    .footer-card a:hover {
      color: var(--accent);
    }
    .footer-meta {
      margin-top: 36px;
      padding-top: 20px;
      border-top: 1px solid var(--border);
      font-family: var(--font-mono);
      font-size: 12px;
      letter-spacing: 0.04em;
      color: var(--text-secondary);
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 12px;
    }

    /* ── Reveal ── */
    .reveal-item {
      opacity: 0;
      transform: translateY(18px);
      transition: opacity 0.25s ease, transform 0.25s ease;
    }
    .reveal-item.visible {
      opacity: 1;
      transform: translateY(0);
    }

    /* ── Responsive ── */
    @media (max-width: 1100px) {
      .quickstart,
      .cta-inner,
      .section-head,
      .feature-grid,
      .chains-grid,
      .footer-grid,
      .memory-viz-layout {
        grid-template-columns: 1fr;
      }
      .memory-graph { max-width: 400px; }
      .cta-actions { justify-content: flex-start; }
      .section-head { align-items: start; }
      .nav-inner { padding: 12px 0; }
    }

    @media (max-width: 900px) {
      .dkg-root section { padding: 88px 0; }
      .flow-strip { grid-template-columns: 1fr; }
      .flow-step:first-child { border-radius: var(--radius-md) var(--radius-md) 0 0; }
      .flow-step:last-child { border-radius: 0 0 var(--radius-md) var(--radius-md); }
      .flow-arrow { display: none; }
      .contrast-row { grid-template-columns: 1fr; gap: 12px; }
      .contrast-arrow { transform: rotate(90deg); padding: 8px 0; justify-self: center; }
      .nav-inner, .nav-links { gap: 12px; }
      .brand small { display: none; }
      .memory-graph { max-width: 340px; }
    }

    @media (max-width: 768px) {
      .dkg-root::before { opacity: 0.1; }
      .hero { padding-top: 32px; }
      .hero-copy h1 { max-width: 16ch; }
      .nav-links a:not(.btn):not(.theme-toggle) { display: none; }
      .footer-grid { gap: 16px; grid-template-columns: 1fr; }
      .footer-shell { padding: 20px; }
      .memory-graph { max-width: 300px; }
    }

    @media (max-width: 480px) {
      .wrap { width: min(calc(100% - 20px), var(--max-width)); }
      .hero-copy h1 { font-size: 2.7rem; }
      .hero-actions, .cta-actions { flex-direction: column; }
      .hero-actions .btn, .cta-actions .btn { width: 100%; }
      .code-panel pre { padding: 18px 16px 18px; font-size: 13px; }
      .layer-card, .feature-card, .chain-card, .footer-card, .contrast-card { padding: 18px; }
      .dkg-root section { padding: 72px 0; }
      .feature-grid, .chains-grid { grid-template-columns: 1fr; }
      .memory-graph { max-width: 260px; }
    }

    @media (prefers-reduced-motion: reduce) {
      .dkg-root { scroll-behavior: auto; }
      *, *::before, *::after {
        animation: none !important;
        transition-duration: 0.01ms !important;
        transition-delay: 0ms !important;
      }
    }

    /* Embedding override: when this prototype is hosted inside another site,
       give the hero comfortable breathing room below the embedding header. */
    .hero { padding-top: 64px !important; }
    @media (max-width: 768px) {
      .hero { padding-top: 32px !important; }
    }