:root {
        --paper: oklch(97.2% 0.012 85);
        --paper-2: oklch(94.2% 0.016 85);
        --rule: oklch(86% 0.018 80);
        --ink: oklch(22% 0.045 262);
        --ink-2: oklch(40% 0.035 262);
        --ink-3: oklch(55% 0.025 262);
        --signal: oklch(58% 0.19 35);
        --signal-soft: oklch(92% 0.05 40);
        --ok: oklch(52% 0.09 160);
        --card: oklch(99% 0.006 85);
        --serif: "Fraunces", Georgia, serif;
        --sans: "Instrument Sans", system-ui, sans-serif;
        --mono: "JetBrains Mono", ui-monospace, monospace;
        --gutter: clamp(16px, 4vw, 56px);
        --max: 1180px;
        --ease: cubic-bezier(0.22, 1, 0.36, 1);
        color-scheme: light;
      }
      @media (prefers-color-scheme: dark) {
        :root:not([data-theme="light"]) {
          --paper: oklch(18% 0.025 262);
          --paper-2: oklch(22% 0.03 262);
          --rule: oklch(32% 0.03 262);
          --ink: oklch(94% 0.012 85);
          --ink-2: oklch(80% 0.015 85);
          --ink-3: oklch(66% 0.018 85);
          --signal: oklch(70% 0.16 38);
          --signal-soft: oklch(30% 0.07 38);
          --ok: oklch(72% 0.1 160);
          --card: oklch(21% 0.028 262);
          color-scheme: dark;
        }
      }
      :root[data-theme="dark"] {
        --paper: oklch(18% 0.025 262);
        --paper-2: oklch(22% 0.03 262);
        --rule: oklch(32% 0.03 262);
        --ink: oklch(94% 0.012 85);
        --ink-2: oklch(80% 0.015 85);
        --ink-3: oklch(66% 0.018 85);
        --signal: oklch(70% 0.16 38);
        --signal-soft: oklch(30% 0.07 38);
        --ok: oklch(72% 0.1 160);
        --card: oklch(21% 0.028 262);
        color-scheme: dark;
      }
      * {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
      }
      html {
        scroll-behavior: smooth;
        -webkit-text-size-adjust: 100%;
      }
      body {
        background: var(--paper);
        color: var(--ink);
        font-family: var(--sans);
        font-size: clamp(16px, 1.05vw, 17.5px);
        line-height: 1.6;
        overflow-x: hidden;
      }
      a {
        color: inherit;
      }
      .wrap {
        max-width: var(--max);
        margin: 0 auto;
        padding: 0 var(--gutter);
      }
      .mono {
        font-family: var(--mono);
        font-size: 0.78em;
        letter-spacing: 0.04em;
        text-transform: uppercase;
      }
      .num {
        font-variant-numeric: tabular-nums;
      }
      h1,
      h2,
      h3 {
        font-family: var(--serif);
        font-weight: 500;
        letter-spacing: -0.015em;
        line-height: 1.08;
        text-wrap: balance;
      }
      h1 {
        font-size: clamp(2.5rem, 6.2vw, 5.4rem);
      }
      h2 {
        font-size: clamp(1.9rem, 3.8vw, 3.2rem);
      }
      h3 {
        font-size: clamp(1.2rem, 1.6vw, 1.45rem);
        line-height: 1.25;
      }
      p {
        max-width: 64ch;
        text-wrap: pretty;
      }
      .lede {
        font-size: clamp(1.08rem, 1.35vw, 1.28rem);
        color: var(--ink-2);
      }
      em.sig {
        font-style: normal;
        color: var(--signal);
      }
      section {
        padding: clamp(52px, 6vw, 92px) 0;
        border-top: 1px solid var(--rule);
      }
      .eyebrow {
        display: flex;
        gap: 0.8rem;
        align-items: center;
        color: var(--ink-3);
        margin-bottom: 1.4rem;
      }
      .eyebrow::before {
        content: "";
        width: 28px;
        height: 1px;
        background: currentColor;
      }

      /* nav */
      header.top {
        position: sticky;
        top: 0;
        z-index: 20;
        background: color-mix(in oklch, var(--ink) 92%, transparent);
        backdrop-filter: saturate(1.2) blur(8px);
        border-bottom: 1px solid
          color-mix(in oklch, var(--paper) 16%, transparent);
      }
      header.top .logo {
        color: var(--paper);
      }
      header.top nav.links a {
        color: color-mix(in oklch, var(--paper) 72%, var(--ink));
      }
      header.top nav.links a:hover,
      header.top nav.links a[aria-current="page"] {
        color: var(--paper);
      }
      header.top .btn {
        background: var(--paper);
        color: var(--ink);
        font-weight: 600;
      }
      header.top .btn:hover {
        background: color-mix(in oklch, var(--paper) 88%, var(--signal));
      }
      header.top .yt-link {
        color: color-mix(in oklch, var(--paper) 72%, var(--ink));
      }
      header.top .yt-link:hover {
        color: #ff4136;
      }
      header.top .wrap {
        display: flex;
        align-items: center;
        justify-content: space-between;
        height: 64px;
        gap: 1rem;
      }
      .logo {
        display: flex;
        align-items: center;
        text-decoration: none;
        flex: none;
      }
      .logo img {
        display: block;
        width: auto;
        height: 36px;
      }
      @media (max-width: 480px) {
        .logo img {
          height: 30px;
        }
      }
      .logo i {
        font-style: normal;
        color: var(--signal);
      }
      nav.links {
        display: flex;
        gap: 1.5rem;
        font-size: 0.93rem;
        font-weight: 600;
        letter-spacing: 0.005em;
      }
      nav.links a {
        text-decoration: none;
        white-space: nowrap;
        color: var(--ink-2);
      }
      nav.links a:hover {
        color: var(--ink);
      }
      .btn {
        display: inline-flex;
        align-items: center;
        white-space: nowrap;
        gap: 0.6rem;
        padding: 0.8rem 1.2rem;
        background: var(--ink);
        color: var(--paper);
        text-decoration: none;
        font-weight: 500;
        font-size: 0.95rem;
        border-radius: 2px;
        transition:
          transform 0.25s var(--ease),
          background 0.2s;
      }
      .btn:hover {
        transform: translateY(-1px);
        background: color-mix(in oklch, var(--ink) 85%, var(--signal));
      }
      .btn.ghost {
        background: transparent;
        color: var(--ink);
        box-shadow: inset 0 0 0 1px var(--rule);
      }
      .btn.ghost:hover {
        box-shadow: inset 0 0 0 1px var(--ink);
        background: transparent;
      }
      .btn .arr {
        transition: transform 0.25s var(--ease);
      }
      .btn:hover .arr {
        transform: translateX(3px);
      }
      @media (max-width: 900px) {
        nav.links {
          display: none;
        }
      }
      @media (max-width: 420px) {
        header.top .btn {
          padding: 0.6rem 0.8rem;
          font-size: 0.85rem;
        }
      }

      /* hero */
      .hero {
        padding: clamp(44px, 5vw, 76px) 0 clamp(48px, 5.5vw, 80px);
        border-top: 0;
      }
      .hero-grid {
        display: grid;
        grid-template-columns: 1.25fr 1fr;
        gap: clamp(32px, 5vw, 72px);
        align-items: end;
      }
      .hero h1 .strike {
        position: relative;
        color: var(--ink-3);
      }
      .hero h1 .strike::after {
        content: "";
        position: absolute;
        left: -2%;
        right: -2%;
        top: 54%;
        height: 0.07em;
        background: var(--signal);
        transform-origin: left;
        animation: strike 1s 0.9s var(--ease) both;
      }
      @keyframes strike {
        from {
          transform: scaleX(0);
        }
        to {
          transform: scaleX(1);
        }
      }
      .hero .lede {
        margin: 1.8rem 0 2.2rem;
      }
      .hero-ctas {
        display: flex;
        flex-wrap: wrap;
        gap: 0.8rem;
        align-items: center;
      }
      .hero-meta {
        margin-top: 1.6rem;
        color: var(--ink-3);
        display: flex;
        flex-wrap: wrap;
        gap: 0.4rem 1.4rem;
      }
      .hero-meta span::before {
        content: "· ";
        color: var(--signal);
      }
      @media (max-width: 900px) {
        .hero-grid {
          grid-template-columns: 1fr;
        }
      }

      /* finding card (hero) */
      .finding {
        background: var(--card);
        border: 1px solid var(--rule);
        padding: clamp(20px, 2.4vw, 32px);
        position: relative;
      }
      .finding .stamp {
        position: absolute;
        top: -11px;
        left: 24px;
        background: var(--signal);
        color: oklch(98% 0.01 85);
        padding: 0.15rem 0.6rem;
      }
      .finding h3 {
        margin: 0.4rem 0 1.2rem;
        font-size: clamp(1.15rem, 1.6vw, 1.4rem);
      }
      .ledger {
        width: 100%;
        border-collapse: collapse;
        font-size: 0.9rem;
      }
      .ledger td {
        padding: 0.55rem 0;
        border-top: 1px solid var(--rule);
        vertical-align: top;
      }
      .ledger td:first-child {
        color: var(--ink-3);
        width: 72%;
        padding-right: 1rem;
      }
      .ledger td.big {
        font-family: var(--serif);
        font-size: 1.5rem;
        line-height: 1.1;
      }
      .ledger .zero {
        color: var(--signal);
      }
      .js .ledger .zero {
        transition:
          opacity 0.5s var(--ease),
          transform 0.5s var(--ease);
      }
      .js .ledger .zero.wait {
        opacity: 0;
        transform: scale(0.6);
      }
      .finding .src {
        margin-top: 1rem;
        color: var(--ink-3);
        font-size: 0.72rem;
      }

      /* overview video */
      .overview {
        background: var(--ink);
        color: var(--paper);
        border-top: 0;
      }
      .overview .eyebrow {
        color: color-mix(in oklch, var(--paper) 62%, var(--ink));
      }
      .overview .lede {
        color: color-mix(in oklch, var(--paper) 80%, var(--ink));
        margin-top: 1.4rem;
      }
      .ov-grid {
        display: grid;
        grid-template-columns: 1fr 1.4fr;
        gap: clamp(32px, 5vw, 72px);
        align-items: center;
      }
      .ov-note {
        margin-top: 1.6rem;
        color: color-mix(in oklch, var(--paper) 62%, var(--ink));
      }
      .ov-frame {
        position: relative;
        aspect-ratio: 16 / 9;
        background: oklch(22% 0.045 262);
        overflow: hidden;
        box-shadow: 0 0 0 1px color-mix(in oklch, var(--paper) 16%, transparent);
      }
      .ov-frame video,
      .ov-frame iframe {
        position: absolute;
        inset: 0;
        width: 100%;
        height: 100%;
        object-fit: cover;
        border: 0;
        display: block;
      }
      .ov-play {
        position: relative;
        margin-top: 16px;
        display: inline-flex;
        align-items: center;
        gap: 0.75rem;
        min-height: 48px;
        padding: 0.55rem 1.1rem 0.55rem 0.55rem;
        border: 0;
        border-radius: 2px;
        background: oklch(97.2% 0.012 85);
        color: oklch(22% 0.045 262);
        font: 500 0.95rem var(--sans);
        cursor: pointer;
        transition: transform 0.25s var(--ease);
      }
      .ov-play:hover {
        transform: translateY(-2px);
      }
      .ov-play .ic {
        width: 36px;
        height: 36px;
        border-radius: 50%;
        background: oklch(58% 0.19 35);
        display: grid;
        place-items: center;
      }
      .ov-play .ic svg {
        width: 12px;
        height: 12px;
        margin-left: 2px;
        fill: oklch(98% 0.01 85);
      }
      .ov-play small {
        font-family: var(--mono);
        font-size: 0.72rem;
        color: oklch(55% 0.025 262);
        letter-spacing: 0.04em;
      }
      .ov-play[hidden] {
        display: none;
      }
      @media (max-width: 900px) {
        .ov-grid {
          grid-template-columns: 1fr;
        }
      }

      /* contradiction */
      .contra {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 0;
        margin-top: 3rem;
        border: 1px solid var(--rule);
      }
      .contra > div {
        padding: clamp(20px, 3vw, 40px);
      }
      .contra > div + div {
        border-left: 1px solid var(--rule);
        background: var(--paper-2);
      }
      .contra .said {
        font-family: var(--serif);
        font-size: clamp(1.4rem, 2.4vw, 2rem);
        line-height: 1.2;
        margin: 0.8rem 0;
      }
      .contra .said.wrong {
        text-decoration: line-through;
        text-decoration-color: var(--signal);
        text-decoration-thickness: 2px;
        color: var(--ink-3);
      }
      @media (max-width: 760px) {
        .contra {
          grid-template-columns: 1fr;
        }
        .contra > div + div {
          border-left: 0;
          border-top: 1px solid var(--rule);
        }
      }

      /* evidence trail */
      .trail {
        margin-top: 3.5rem;
        display: grid;
        grid-template-columns: 150px 1fr;
        border-top: 1px solid var(--ink);
      }
      .trail .row {
        display: contents;
      }
      .trail .row > * {
        padding: 1rem 0;
        border-bottom: 1px solid var(--rule);
      }
      .trail .sys {
        color: var(--ink-3);
        padding-right: 1rem;
      }
      .trail .evts {
        display: flex;
        flex-wrap: wrap;
        gap: 0.5rem 1.2rem;
        align-items: baseline;
      }
      .evt {
        display: inline-flex;
        gap: 0.5rem;
        align-items: baseline;
      }
      .evt b {
        font-weight: 500;
      }
      .evt small {
        color: var(--ink-3);
        font-family: var(--mono);
        font-size: 0.7rem;
        letter-spacing: 0.03em;
        text-transform: uppercase;
      }
      .evt.hot b {
        color: var(--signal);
        background: linear-gradient(var(--signal-soft), var(--signal-soft))
          no-repeat 0 92% / 100% 0.45em;
      }
      .trail .row.verdict > * {
        border-bottom: 0;
        padding-top: 1.4rem;
      }
      .trail .row.verdict .evts {
        font-family: var(--serif);
        font-size: clamp(1.2rem, 2vw, 1.6rem);
        line-height: 1.25;
      }
      /* trail assembles event by event, in time order */
      .js .trail .evt,
      .js .trail .verdict .evts {
        opacity: 0;
        transform: translateX(-10px);
        transition:
          opacity 0.6s var(--ease),
          transform 0.6s var(--ease);
        transition-delay: calc(var(--i, 0) * 160ms + 200ms);
      }
      .js .trail.in .evt,
      .js .trail.in .verdict .evts {
        opacity: 1;
        transform: none;
      }
      .js .trail .evt.hot b {
        background-size: 0% 0.45em;
        transition: background-size 0.7s var(--ease);
        transition-delay: calc(var(--i, 0) * 160ms + 650ms);
      }
      .js .trail.in .evt.hot b {
        background-size: 100% 0.45em;
      }
      @media (max-width: 640px) {
        .trail {
          grid-template-columns: 1fr;
        }
        .trail .sys {
          padding-bottom: 0;
          border-bottom: 0;
        }
      }

      /* reach vs count */
      .split {
        display: grid;
        grid-template-columns: 1fr 1.3fr;
        gap: clamp(32px, 6vw, 96px);
        align-items: start;
      }
      @media (max-width: 900px) {
        .split {
          grid-template-columns: 1fr;
        }
      }
      .compare {
        width: 100%;
        border-collapse: collapse;
        font-size: 0.93rem;
      }
      .compare th,
      .compare td {
        text-align: left;
        padding: 0.85rem 0.8rem 0.85rem 0;
        border-bottom: 1px solid var(--rule);
        vertical-align: top;
      }
      .compare thead th {
        font-family: var(--mono);
        font-size: 0.7rem;
        letter-spacing: 0.05em;
        text-transform: uppercase;
        color: var(--ink-3);
        font-weight: 400;
        border-bottom: 1px solid var(--ink);
      }
      .compare thead th:last-child {
        color: var(--signal);
      }
      .compare td:first-child {
        font-weight: 500;
        width: 26%;
      }
      .compare td:last-child {
        color: var(--ink);
      }
      .compare td {
        color: var(--ink-2);
      }
      .yes {
        color: var(--ok) !important;
      }
      .table-scroll {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
      }
      .table-scroll .compare {
        min-width: 560px;
      }

      /* seats */
      .seats {
        margin-top: 3rem;
        display: grid;
        grid-template-columns: repeat(12, 1fr);
        gap: 1px;
        background: var(--rule);
        border: 1px solid var(--rule);
      }
      .seat {
        background: var(--paper);
        padding: clamp(20px, 2.5vw, 32px);
        display: flex;
        flex-direction: column;
        gap: 0.7rem;
      }
      .seat:nth-child(1) {
        grid-column: span 5;
      }
      .seat:nth-child(2) {
        grid-column: span 7;
      }
      .seat:nth-child(3) {
        grid-column: span 4;
      }
      .seat:nth-child(4) {
        grid-column: span 4;
      }
      .seat:nth-child(5) {
        grid-column: span 4;
      }
      .seat .who {
        color: var(--ink-3);
      }
      .seat blockquote {
        font-family: var(--serif);
        font-size: clamp(1.15rem, 1.6vw, 1.4rem);
        line-height: 1.25;
      }
      .seat p {
        color: var(--ink-2);
        font-size: 0.93rem;
      }
      .seat .get {
        margin-top: auto;
        padding-top: 0.8rem;
        border-top: 1px dashed var(--rule);
        font-size: 0.88rem;
      }
      .seat .get b {
        color: var(--signal);
        font-weight: 500;
      }
      @media (max-width: 900px) {
        .seat {
          grid-column: span 12 !important;
        }
      }

      /* timeline */
      .weeks {
        margin-top: 3rem;
        display: grid;
        grid-template-columns: 1fr 3fr 1fr;
        border: 1px solid var(--rule);
      }
      .week {
        padding: clamp(20px, 2.5vw, 32px);
        position: relative;
      }
      .week + .week {
        border-left: 1px solid var(--rule);
      }
      .week:nth-child(2) {
        background: var(--paper-2);
      }
      .week .when {
        color: var(--signal);
      }
      .week h3 {
        margin: 0.6rem 0;
      }
      .week p {
        color: var(--ink-2);
        font-size: 0.93rem;
      }
      .bar {
        height: 6px;
        background: var(--rule);
        margin-top: 1.4rem;
        position: relative;
        overflow: hidden;
      }
      .bar i {
        position: absolute;
        inset: 0;
        background: var(--ink);
        transform-origin: left;
        transform: scaleX(0);
        transition: transform 1.4s var(--ease);
      }
      .in .bar i {
        transform: scaleX(1);
      }
      @media (max-width: 760px) {
        .weeks {
          grid-template-columns: 1fr;
        }
        .week + .week {
          border-left: 0;
          border-top: 1px solid var(--rule);
        }
      }

      /* keep */
      .keep {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: clamp(24px, 4vw, 56px);
        margin-top: 3rem;
      }
      .keep > div {
        border-top: 2px solid var(--ink);
        padding-top: 1.2rem;
      }
      .keep p {
        color: var(--ink-2);
        font-size: 0.95rem;
        margin-top: 0.5rem;
      }
      @media (max-width: 760px) {
        .keep {
          grid-template-columns: 1fr;
        }
      }
      .secure {
        margin-top: 3.5rem;
        padding: clamp(20px, 3vw, 36px);
        background: var(--paper-2);
        display: grid;
        grid-template-columns: auto 1fr;
        gap: 1.4rem 2.4rem;
      }
      .secure ul {
        list-style: none;
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 0.6rem 2rem;
        font-size: 0.93rem;
      }
      .secure li::before {
        content: "✓ ";
        color: var(--ok);
      }
      @media (max-width: 760px) {
        .secure {
          grid-template-columns: 1fr;
        }
        .secure ul {
          grid-template-columns: 1fr;
        }
      }

      /* case 2 */
      .case2 {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: clamp(32px, 5vw, 80px);
        margin-top: 3rem;
      }
      .stats {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        border-top: 1px solid var(--ink);
      }
      .stats div {
        padding: 1.1rem 0;
        border-bottom: 1px solid var(--rule);
      }
      .stats div:nth-child(odd) {
        padding-right: 1rem;
      }
      .stats b {
        display: block;
        font-family: var(--serif);
        font-weight: 500;
        font-size: clamp(1.8rem, 3vw, 2.6rem);
        line-height: 1;
      }
      .stats span {
        color: var(--ink-3);
        font-size: 0.85rem;
      }
      .blockers li {
        list-style: none;
        padding: 1rem 0;
        border-bottom: 1px solid var(--rule);
        display: grid;
        grid-template-columns: 1fr auto;
        gap: 0.2rem 1rem;
      }
      .blockers li:first-child {
        border-top: 1px solid var(--ink);
      }
      .blockers b {
        font-weight: 500;
      }
      .blockers small {
        grid-column: 1;
        color: var(--ink-2);
        font-size: 0.9rem;
      }
      .blockers .c {
        grid-row: 1/3;
        grid-column: 2;
        color: var(--signal);
      }
      @media (max-width: 860px) {
        .case2 {
          grid-template-columns: 1fr;
        }
      }

      /* stack */
      .stack {
        display: flex;
        flex-wrap: wrap;
        gap: 0.6rem;
        margin-top: 2rem;
      }
      .stack span {
        padding: 0.45rem 0.8rem;
        border: 1px solid var(--rule);
        font-size: 0.88rem;
        color: var(--ink-2);
      }

      /* white paper */
      .paper-grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: clamp(32px, 6vw, 96px);
        align-items: center;
      }
      .paper-grid .lede {
        margin-top: 1rem;
      }
      .paper-grid .body {
        margin: 1.2rem 0 2rem;
        color: var(--ink-2);
      }
      .paper-meta {
        margin-top: 1.4rem;
        color: var(--ink-3);
        display: flex;
        flex-wrap: wrap;
        gap: 0.4rem 1.4rem;
      }
      .paper-meta span::before {
        content: "· ";
        color: var(--signal);
      }
      .fig {
        background: var(--card);
        border: 1px solid var(--rule);
        padding: clamp(20px, 2.6vw, 32px);
      }
      .fig svg {
        width: 100%;
        height: auto;
        display: block;
        overflow: visible;
      }
      .fig .axis {
        stroke: var(--ink-3);
        stroke-width: 1;
        fill: none;
      }
      .fig .shared {
        stroke: var(--ink-3);
        stroke-width: 2.5;
        fill: none;
      }
      .fig .dedicated {
        stroke: var(--signal);
        stroke-width: 2.5;
        fill: none;
      }
      .fig .zone {
        fill: var(--signal);
        fill-opacity: 0.08;
      }
      .fig .dot {
        fill: var(--ink);
      }
      .fig text {
        font-family: var(--mono);
        font-size: 10px;
        letter-spacing: 0.04em;
        fill: var(--ink-3);
        text-transform: uppercase;
      }
      .fig text.lab {
        font-family: var(--sans);
        font-size: 12.5px;
        letter-spacing: 0;
        text-transform: none;
        fill: var(--ink-2);
      }
      .fig text.lab.sig {
        fill: var(--signal);
      }
      .fig figcaption {
        margin-top: 1rem;
        color: var(--ink-3);
        font-size: 0.72rem;
      }
      .js .fig .draw {
        stroke-dasharray: 1;
        stroke-dashoffset: 1;
        transition: stroke-dashoffset 1.6s var(--ease);
      }
      .js .fig .draw.d2 {
        transition-delay: 0.25s;
      }
      .js .fig.in .draw {
        stroke-dashoffset: 0;
      }
      .js .fig .late {
        opacity: 0;
        transition: opacity 0.6s var(--ease) 1.4s;
      }
      .js .fig.in .late {
        opacity: 1;
      }
      @media (max-width: 900px) {
        .paper-grid {
          grid-template-columns: 1fr;
        }
      }

      /* faq */
      details {
        border-bottom: 1px solid var(--rule);
      }
      details:first-of-type {
        border-top: 1px solid var(--ink);
      }
      summary {
        list-style: none;
        cursor: pointer;
        padding: 1.2rem 2.4rem 1.2rem 0;
        font-family: var(--serif);
        font-size: clamp(1.1rem, 1.5vw, 1.3rem);
        position: relative;
      }
      summary::-webkit-details-marker {
        display: none;
      }
      summary::after {
        content: "+";
        position: absolute;
        right: 0;
        top: 1.1rem;
        font-family: var(--mono);
        color: var(--signal);
        transition: transform 0.3s;
      }
      details[open] summary::after {
        transform: rotate(45deg);
      }
      details p {
        padding: 0 0 1.4rem;
        color: var(--ink-2);
      }

      /* close */
      .close {
        background: var(--ink);
        color: var(--paper);
        border-top: 0;
      }
      .close h2 {
        max-width: 18ch;
      }
      .close p {
        color: color-mix(in oklch, var(--paper) 78%, var(--ink));
      }
      .close .btn,
      .overview .btn {
        background: var(--paper);
        color: var(--ink);
      }
      .close .btn.ghost {
        background: transparent;
        color: var(--paper);
        box-shadow: inset 0 0 0 1px
          color-mix(in oklch, var(--paper) 35%, transparent);
      }
      .close-grid {
        display: grid;
        grid-template-columns: 1.4fr 1fr;
        gap: clamp(32px, 5vw, 80px);
        align-items: end;
      }
      .promise {
        border-left: 1px solid
          color-mix(in oklch, var(--paper) 30%, transparent);
        padding-left: 1.6rem;
        font-size: 0.95rem;
      }
      .promise li {
        list-style: none;
        padding: 0.35rem 0;
      }
      @media (max-width: 860px) {
        .close-grid {
          grid-template-columns: 1fr;
        }
      }
      footer {
        background: var(--ink);
        color: color-mix(in oklch, var(--paper) 60%, var(--ink));
        padding: 2rem 0;
        font-size: 0.85rem;
        border-top: 1px solid color-mix(in oklch, var(--paper) 15%, transparent);
      }
      footer .wrap {
        display: flex;
        justify-content: space-between;
        flex-wrap: wrap;
        gap: 1rem;
      }

      /* reveal */
      .js .rv {
        opacity: 0;
        transform: translateY(14px);
        transition:
          opacity 0.9s var(--ease),
          transform 0.9s var(--ease);
      }
      .js .rv.in {
        opacity: 1;
        transform: none;
      }
      /* hero never waits on the observer: plays once on load */
      .js .hero .rv {
        opacity: 1;
        transform: none;
        animation: rise 0.9s var(--ease) both;
        animation-delay: calc(var(--d, 0) * 90ms);
      }
      @keyframes rise {
        from {
          opacity: 0;
          transform: translateY(14px);
        }
      }
      @media (prefers-reduced-motion: reduce) {
        *,
        *::before,
        *::after {
          animation: none !important;
          transition: none !important;
        }
        .js .rv,
        .js .trail .evt,
        .js .trail .verdict .evts,
        .js .ledger .zero.wait,
        .js .fig .late {
          opacity: 1;
          transform: none;
        }
        .js .trail .evt.hot b {
          background-size: 100% 0.45em;
        }
        .js .fig .draw {
          stroke-dashoffset: 0;
        }
      }
      :focus-visible {
        outline: 2px solid var(--signal);
        outline-offset: 3px;
      }
    

      /* panel 2 timeline animation (always on a dark frame) */
      .ov-frame #tl {
        position: absolute;
        inset: 0;
        width: 100%;
        height: 100%;
        display: block;
      }
      .tl-bg {
        fill: #151d36;
      }
      .tl-head {
        font: 500 18px var(--mono);
        letter-spacing: 0.12em;
        fill: #8d95ae;
      }
      .tl-cap {
        font: 500 30px var(--sans);
        fill: #eef0f6;
        opacity: 0;
      }
      .tl-cap-hot {
        fill: #f2855e;
      }
      .tl-lane {
        stroke: #2a3456;
        stroke-width: 1.5;
      }
      .tl-lane-name {
        font: 500 16px var(--mono);
        letter-spacing: 0.1em;
        fill: #8d95ae;
      }
      .tl-dot {
        fill: #3cc8cf;
      }
      .tl-halo {
        fill: none;
        stroke: #3cc8cf;
        stroke-width: 2;
      }
      .tl-evt.hot .tl-dot {
        fill: #f2855e;
      }
      .tl-evt.hot .tl-halo {
        stroke: #f2855e;
      }
      .tl-title {
        font: 600 24px var(--sans);
        fill: #eef0f6;
      }
      .tl-evt.hot .tl-title {
        fill: #f7a585;
      }
      .tl-sub {
        font: 500 14px var(--mono);
        letter-spacing: 0.08em;
        fill: #8d95ae;
      }
      .tl-seg {
        stroke: #3cc8cf;
        stroke-width: 2.5;
        stroke-dasharray: 6 7;
        stroke-linecap: round;
      }

      /* agents: reach vs analysis graphic */
      .why-h {
        max-width: 22ch;
      }
      .reach {
        margin-top: 2.6rem;
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 1px;
        background: var(--rule);
        border: 1px solid var(--rule);
      }
      .reach-card {
        background: var(--paper);
        padding: clamp(18px, 2.4vw, 30px);
      }
      .reach-card.lake {
        background: var(--paper-2);
      }
      .reach-card figcaption {
        display: flex;
        flex-direction: column;
        gap: 0.3rem;
        margin-bottom: 1rem;
      }
      .reach-card figcaption .mono {
        color: var(--ink-3);
      }
      .reach-card.lake figcaption .mono {
        color: var(--signal);
      }
      .reach-card figcaption b {
        font-family: var(--serif);
        font-weight: 500;
        font-size: clamp(1.1rem, 1.5vw, 1.3rem);
        line-height: 1.25;
      }
      .reach-card svg {
        width: 100%;
        height: auto;
        display: block;
        overflow: visible;
      }
      .r-pill {
        fill: var(--card);
        stroke: var(--rule);
      }
      .r-pilltx,
      .r-cardk,
      .r-note,
      .r-laketx {
        font: 500 10.5px var(--mono);
        letter-spacing: 0.06em;
        fill: var(--ink-2);
      }
      .r-ln {
        fill: none;
        stroke: var(--ink-3);
        stroke-width: 1.2;
      }
      .r-ln.hotln {
        stroke: var(--signal);
        stroke-width: 2;
      }
      .r-card {
        fill: var(--card);
        stroke: var(--ink);
      }
      .r-cardk {
        fill: var(--ink-3);
        font-size: 9.5px;
      }
      .r-cardt {
        font: 600 15px var(--sans);
        fill: var(--ink);
      }
      .r-lake {
        fill: var(--ink);
      }
      .r-laketx {
        fill: var(--paper);
        letter-spacing: 0.14em;
      }
      .r-sq.dim {
        fill: var(--paper-2);
        stroke: var(--rule);
      }
      .reach-card.lake .r-sq.dim {
        fill: var(--paper);
      }
      .r-sq.lit,
      .r-sq.hot {
        fill: var(--signal);
      }
      .r-sq.on {
        fill: var(--ink);
      }
      .r-note.hotx {
        fill: var(--signal);
      }
      .js .reach .draw {
        stroke-dasharray: 1;
        stroke-dashoffset: 1;
        transition: stroke-dashoffset 1s var(--ease) 0.2s;
      }
      .js .reach .draw.d2 {
        transition-delay: 0.9s;
      }
      .js .reach.in .draw {
        stroke-dashoffset: 0;
      }
      .js .reach .r-sq.on,
      .js .reach .r-sq.hot {
        fill: var(--rule);
        transition: fill 0.4s var(--ease);
        transition-delay: calc(1.3s + var(--i) * 35ms);
      }
      .js .reach.in .r-sq.on {
        fill: var(--ink);
      }
      .js .reach.in .r-sq.hot {
        fill: var(--signal);
        transition-delay: calc(2.5s + var(--i) * 35ms);
      }
      .js .reach .r-sq.lit {
        fill: var(--rule);
        transition: fill 0.4s var(--ease) 1.6s;
      }
      .js .reach.in .r-sq.lit {
        fill: var(--signal);
      }
      .more {
        display: inline-flex;
        gap: 0.5rem;
        margin-top: 1.6rem;
        font-weight: 500;
        color: var(--ink);
        text-decoration: none;
        border-bottom: 1px solid var(--signal);
        padding-bottom: 2px;
      }
      .more:hover .arr {
        transform: translateX(3px);
      }
      .more .arr {
        transition: transform 0.25s var(--ease);
      }
      @media (max-width: 860px) {
        .reach {
          grid-template-columns: 1fr;
        }
      }

      /* five leaders mini visuals */
      .seat .viz {
        height: 56px;
        margin-bottom: 0.6rem;
      }
      .seat .viz svg {
        height: 100%;
        width: auto;
        max-width: 100%;
        display: block;
        overflow: visible;
      }
      .v-k,
      .v-kw {
        font: 500 9px var(--mono);
        letter-spacing: 0.06em;
        fill: var(--ink-3);
      }
      .v-kw {
        fill: oklch(98% 0.01 85);
      }
      .v-ink {
        fill: var(--ink);
      }
      .v-sig {
        fill: var(--signal);
      }
      .v-mute {
        fill: var(--rule);
      }
      .v-inkf {
        fill: var(--ink);
      }
      .v-mutef {
        fill: var(--rule);
      }
      .v-sigf {
        fill: var(--signal);
      }
      .v-sigf.o2 {
        opacity: 0.7;
      }
      .v-sigf.o3 {
        opacity: 0.45;
      }
      .v-line {
        fill: none;
        stroke: var(--ink-3);
        stroke-width: 1.2;
      }
      .v-line.ink {
        stroke: var(--ink);
        stroke-width: 1.6;
      }
      .v-box {
        fill: none;
        stroke: var(--ink);
        stroke-width: 1.4;
      }
      .v-box.mute {
        stroke: var(--ink-3);
      }

      /* resources strip (homepage) */
      .res-grid {
        margin-top: 2.6rem;
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 1px;
        background: var(--rule);
        border: 1px solid var(--rule);
      }
      .res {
        background: var(--paper);
        padding: clamp(20px, 2.5vw, 32px);
        display: flex;
        flex-direction: column;
        gap: 0.7rem;
        text-decoration: none;
        transition: background 0.2s;
      }
      .res:hover {
        background: var(--paper-2);
      }
      .res .mono {
        color: var(--signal);
      }
      .res p {
        color: var(--ink-2);
        font-size: 0.93rem;
      }
      .res .go {
        margin-top: auto;
        padding-top: 0.6rem;
        font-weight: 500;
        font-size: 0.92rem;
      }
      .res .go .arr {
        display: inline-block;
        transition: transform 0.25s var(--ease);
      }
      .res:hover .go .arr {
        transform: translateX(3px);
      }
      @media (max-width: 860px) {
        .res-grid {
          grid-template-columns: 1fr;
        }
      }

      /* resources page */
      .page-hero {
        padding: clamp(44px, 5vw, 76px) 0 clamp(32px, 3.5vw, 52px);
        border-top: 0;
      }
      .page-hero h1 {
        font-size: clamp(2.3rem, 5vw, 4.2rem);
        max-width: 16ch;
      }
      .page-hero .lede {
        margin-top: 1.4rem;
      }
      .toc {
        margin-top: 2rem;
        display: flex;
        flex-wrap: wrap;
        gap: 0.6rem;
      }
      .toc a {
        padding: 0.5rem 0.9rem;
        border: 1px solid var(--rule);
        font-size: 0.9rem;
        text-decoration: none;
        color: var(--ink-2);
      }
      .toc a:hover {
        border-color: var(--ink);
        color: var(--ink);
      }
      nav.links a[aria-current="page"] {
        color: var(--ink);
        box-shadow: 0 1px 0 var(--signal);
      }
      .fig .sq-dim {
        fill: var(--paper-2);
        stroke: var(--rule);
      }
      .fig .sq-on {
        fill: var(--ink);
      }
      .fig .sq-hot {
        fill: var(--signal);
      }
      @media (prefers-reduced-motion: reduce) {
        .js .reach .draw {
          stroke-dashoffset: 0;
        }
        .js .reach .r-sq.on {
          fill: var(--ink);
        }
        .js .reach .r-sq.hot,
        .js .reach .r-sq.lit {
          fill: var(--signal);
        }
      }

      section[id] {
        scroll-margin-top: 64px;
      }
      .ov-note a {
        color: inherit;
        text-underline-offset: 3px;
      }
      .ov-note a:hover {
        color: var(--paper);
      }

      /* YouTube links */
      .top-actions {
        display: flex;
        align-items: center;
        gap: 0.9rem;
      }
      .yt-link {
        white-space: nowrap;
        display: inline-flex;
        align-items: center;
        gap: 0.45rem;
        min-height: 44px;
        padding: 0 0.3rem;
        font-size: 0.93rem;
        font-weight: 600;
        text-decoration: none;
        color: var(--ink-2);
        transition: color 0.2s;
      }
      .yt-link:hover {
        color: #e62117;
      }
      .yt-link svg {
        width: 26px;
        height: 26px;
        fill: currentColor;
      }
      .ov-links {
        margin-top: 1.8rem;
        display: flex;
        flex-wrap: wrap;
        gap: 0.8rem;
      }
      .yt-ic svg {
        width: 20px;
        height: 20px;
        fill: #e62117;
        display: block;
      }
      .overview .btn.ghost {
        background: transparent;
        color: var(--paper);
        box-shadow: inset 0 0 0 1px
          color-mix(in oklch, var(--paper) 35%, transparent);
      }
      .overview .btn.ghost:hover {
        box-shadow: inset 0 0 0 1px var(--paper);
      }
      @media (max-width: 420px) {
        .top-actions {
          gap: 0.3rem;
        }
      }

      /* intro video: labelled header link, hero button, modal */
      .yt-link svg {
        width: 24px;
        height: 24px;
        fill: currentColor;
        flex: none;
      }
      .btn.vbtn {
        gap: 0.55rem;
      }
      .play-ic {
        width: 10px;
        height: 12px;
        fill: var(--signal);
        flex: none;
      }
      .overview .btn.vbtn .play-ic {
        fill: var(--signal);
      }
      @media (max-width: 1180px) {
        .yt-link span {
          position: absolute;
          width: 1px;
          height: 1px;
          overflow: hidden;
          clip-path: inset(50%);
          white-space: nowrap;
        }
        .yt-link {
          padding: 0 0.5rem;
        }
      }
      .vmodal {
        position: fixed;
        inset: 0;
        z-index: 60;
        display: grid;
        place-items: center;
        padding: clamp(16px, 4vw, 48px);
        background: color-mix(in oklch, oklch(14% 0.03 262) 78%, transparent);
        backdrop-filter: blur(4px);
      }
      .vmodal[hidden] {
        display: none;
      }
      .vmodal-in {
        width: min(100%, 1040px);
      }
      .vmodal-x {
        display: inline-flex;
        align-items: center;
        gap: 0.4rem;
        margin: 0 0 0.7rem auto;
        padding: 0.5rem 0.9rem;
        min-height: 44px;
        border: 0;
        border-radius: 2px;
        background: oklch(97.2% 0.012 85);
        color: oklch(22% 0.045 262);
        font: 600 0.92rem var(--sans);
        cursor: pointer;
      }
      .vmodal-frame {
        position: relative;
        aspect-ratio: 16 / 9;
        background: oklch(14% 0.03 262);
      }
      .vmodal-frame iframe {
        position: absolute;
        inset: 0;
        width: 100%;
        height: 100%;
        border: 0;
      }

      /* Header ribbon: always navy with the white logo, in light and dark mode.
         The page theme flips --ink and --paper in dark mode; pin them here. */
      header.top {
        --ink: oklch(22% 0.045 262);
        --paper: oklch(97.2% 0.012 85);
        --signal: oklch(58% 0.19 35);
      }