*, *::before, *::after {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    :root {
      --bg: #ffffff;
      --text: #000000;
      --line: rgba(0, 0, 0, 0.18);
      --muted: rgba(0, 0, 0, 0.45);
      --soft: rgba(0, 0, 0, 0.06);

      --pad: 14px;
      --header-pad: 12px;
      --max: 1500px;

      --fast-transition: 0.18s ease;
      --transition: 0.5s cubic-bezier(0.65, 0, 0.35, 1);

      --section-gap: 9rem;
      --section-gap-sm: 5rem;
    }

    body.dark {
      --bg: #000000;
      --text: #ffffff;
      --line: rgba(255, 255, 255, 0.22);
      --muted: rgba(255, 255, 255, 0.45);
      --soft: rgba(255, 255, 255, 0.08);
    }

    html {
      background: var(--bg);
      color: var(--text);
      scroll-behavior: auto;
      -webkit-text-size-adjust: 100%;
      text-size-adjust: 100%;
      overflow-x: hidden;

      /* Hide scrollbar (Firefox / old Edge) */
      scrollbar-width: none;
      -ms-overflow-style: none;
    }

    /* Hide scrollbar (Chrome / Safari / Edge) */
    html::-webkit-scrollbar,
    body::-webkit-scrollbar {
      width: 0;
      height: 0;
      display: none;
    }

    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
    }

    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
      }
    }

    body {
      min-height: 100vh;
      background: var(--bg);
      color: var(--text);
      font-family: Inter, 'Helvetica Neue', Helvetica, Arial, system-ui, -apple-system, sans-serif;
      font-weight: 400;
      line-height: 1.1;
      letter-spacing: -0.02em;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      transition: background-color var(--fast-transition), color var(--fast-transition);
      overflow-x: hidden;
      max-width: 100vw;
    }

    a { color: inherit; }
    button, input, textarea { font: inherit; }
    button { color: inherit; }

    ::selection {
      background: var(--text);
      color: var(--bg);
    }

    /* HEADER */
    .header {
      position: fixed;
      top: 0.07em; left: 0; right: 0;
      z-index: 60;
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      padding: calc(var(--header-pad) + env(safe-area-inset-top, 0px)) var(--pad) var(--header-pad);
      background: var(--bg);
      font-family: 'SF Mono', 'Fira Code', Consolas, monospace;
      contain: layout paint style;
      transition: background-color var(--fast-transition), color var(--fast-transition);
    }

    .logo {
      font-family: 'Helvetica Neue';
      font-size: 1.05rem;
      font-weight: 700;
      line-height: 1;
      letter-spacing: -0.02em;
      text-decoration: none;
      text-transform: none;
      flex-shrink: 0;
    }

    .header-right {
      display: flex;
      align-items: center;
      gap: 0.55rem;
      font-size: 0.72rem;
      font-weight: 500;
      letter-spacing: 0.06em;
      text-transform: uppercase;
      min-width: 0;
      flex-wrap: wrap;
      justify-content: flex-end;
    }

    .header-link,
    .control-btn {
      color: var(--text);
      background: none;
      border: 0;
      font: inherit;
      font-size: inherit;
      font-weight: inherit;
      letter-spacing: inherit;
      text-transform: inherit;
      text-decoration: none;
      cursor: pointer;
      -webkit-tap-highlight-color: transparent;
      padding: 0.1rem 0;
      border-bottom: 1px solid transparent;
      transition: opacity var(--fast-transition), border-color var(--fast-transition);
      white-space: nowrap;
    }

    .header-link:hover,
    .header-link:focus-visible,
    .control-btn:hover,
    .control-btn:focus-visible {
      opacity: 0.55;
      outline: none;
    }

    .header-link.active {
      border-bottom-color: var(--text);
    }

    .divider {
      opacity: 0.35;
      user-select: none;
      font-weight: 300;
    }

    /* LAYOUT */
    main { width: 100%; }

    .container {
      width: 100%;
      max-width: var(--max);
      margin: 0 auto;
      padding-left: var(--pad);
      padding-right: var(--pad);
      min-width: 0;
    }

    .block {
      padding-top: var(--section-gap);
      padding-bottom: var(--section-gap);

      /* Avoid laying out/painting distant sections until they approach the viewport. */
      content-visibility: auto;
      contain-intrinsic-size: 0 900px;
    }

    .block + .block {
      border-top: 1px solid var(--line);
    }

    .kicker {
      display: flex;
      align-items: center;
      gap: 0.75rem;
      flex-wrap: wrap;
      margin-bottom: 2.5rem;
      font-family: 'SF Mono', 'Fira Code', Consolas, monospace;
      font-size: 0.68rem;
      line-height: 1;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      color: var(--muted);
    }

    .kicker::before {
      content: "";
      display: block;
      width: 22px;
      height: 1px;
      background: var(--text);
      opacity: 0.5;
      flex-shrink: 0;
    }

    .kicker .kicker-num {
      margin-left: auto;
      opacity: 0.45;
    }

    /* HERO */
    .about-hero {
      min-height: 100svh;
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
      padding-top: calc(9rem + env(safe-area-inset-top, 0px));
      padding-bottom: 2rem;
    }

    .about-hero-top {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      gap: 2rem;
      margin-bottom: 3rem;
      flex-wrap: wrap;
    }

    .about-hero-kicker {
      font-family: 'SF Mono', 'Fira Code', Consolas, monospace;
      font-size: 0.68rem;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      color: var(--muted);
      min-width: 0;
    }

    .about-hero-kicker span {
      display: block;
      margin-top: 0.35rem;
      opacity: 0.9;
    }

    .about-hero-title {
      font-size: clamp(3rem, 11vw, 11rem);
      font-weight: 700;
      line-height: 0.9;
      letter-spacing: -0.055em;
      text-transform: uppercase;
      display: flex;
      flex-wrap: wrap;
      align-items: baseline;
      gap: 0 1.5vw;
      overflow-wrap: break-word;
      word-break: break-word;
      max-width: 100%;
      min-width: 0;
    }

    .about-hero-title .slash {
      font-weight: 300;
      opacity: 0.35;
      transform: translateY(-0.06em);
      margin-bottom: 0.15em;
    }

    .about-hero-title > span:first-child {
      margin-bottom: 0.12em;
    }

    .about-hero-title .right {
      margin-left: auto;
      color: transparent;
      -webkit-text-stroke: 1.4px var(--text);
      line-height: 0.92;
      white-space: nowrap;
    }

    body.dark .about-hero-title .right {
      -webkit-text-stroke-color: var(--text);
    }

    .about-hero-bottom {
      display: grid;
      grid-template-columns: 1fr auto;
      gap: 3rem;
      align-items: end;
      margin-top: 3.5rem;
      min-width: 0;
    }

    .about-hero-copy {
      font-size: clamp(1.05rem, 1.6vw, 1.4rem);
      line-height: 1.35;
      letter-spacing: -0.025em;
      max-width: 48ch;
      overflow-wrap: break-word;
    }

    .about-hero-copy .muted {
      display: block;
      margin-top: 0;
      color: var(--muted);
      font-size: 0.95rem;
      line-height: 1.5;
      max-width: 48ch;
    }

    .about-hero-scroll {
      font-family: 'SF Mono', 'Fira Code', Consolas, monospace;
      font-size: 0.68rem;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      color: var(--muted);
      display: inline-flex;
      align-items: center;
      gap: 0.6rem;
      text-decoration: none;
      transition: opacity var(--fast-transition), gap var(--fast-transition);
      min-height: 44px;
      padding: 0.5rem 0;
    }

    .about-hero-scroll:hover {
      opacity: 0.55;
      gap: 0.95rem;
    }

    /* HOW */
    .how-head {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 6vw;
      align-items: end;
      margin-bottom: var(--section-gap-sm);
      min-width: 0;
    }

    .how-title {
      font-size: clamp(1.2rem, 5vw, 4rem);
      font-weight: 700;
      line-height: 0.9;
      letter-spacing: -0.05em;
      text-transform: uppercase;
      overflow-wrap: break-word;
      word-break: break-word;
      min-width: 0;
    }

    .how-intro {
      font-size: clamp(1rem, 1.5vw, 1.25rem);
      line-height: 1.45;
      color: var(--muted);
      max-width: 42ch;
      justify-self: end;
      overflow-wrap: break-word;
      min-width: 0;
    }

    .how-list {
      border-top: 1px solid var(--line);
    }

    .how-row {
      display: grid;
      grid-template-columns: 80px 1fr 1fr;
      gap: 2rem;
      padding: 2.2rem 0;
      border-bottom: 1px solid var(--line);
      min-width: 0;
    }

    .how-num {
      font-family: 'SF Mono', 'Fira Code', Consolas, monospace;
      font-size: 0.72rem;
      color: var(--muted);
      padding-top: 0.35rem;
    }

    .how-name {
      font-size: clamp(1.3rem, 2.4vw, 2.2rem);
      font-weight: 600;
      line-height: 0.98;
      letter-spacing: -0.035em;
      text-transform: uppercase;
      overflow-wrap: break-word;
      word-break: break-word;
      min-width: 0;
    }

    .how-copy {
      color: var(--muted);
      font-size: clamp(0.95rem, 1.25vw, 1.1rem);
      line-height: 1.45;
      max-width: 48ch;
      overflow-wrap: break-word;
      min-width: 0;
    }

    .how-copy strong {
      display: block;
      color: var(--text);
      font-weight: 500;
      letter-spacing: -0.01em;
    }

    /* WHAT WE BUILD */
    .build-grid {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      border-top: 1px solid var(--line);
      border-left: 1px solid var(--line);
      min-width: 0;
    }

    .build-item {
      min-height: 240px;
      padding: 1.8rem;
      border-right: 1px solid var(--line);
      border-bottom: 1px solid var(--line);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      gap: 2rem;
      min-width: 0;
      transition: background-color var(--fast-transition), color var(--fast-transition);
    }

    .build-item:hover {
      background: var(--text);
      color: var(--bg);
    }

    .build-num {
      font-family: 'SF Mono', 'Fira Code', Consolas, monospace;
      font-size: 0.68rem;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      color: var(--muted);
    }

    .build-item:hover .build-num {
      color: var(--bg);
      opacity: 0.6;
    }

    .build-title {
      font-size: clamp(1.3rem, 2.6vw, 2.4rem);
      font-weight: 600;
      line-height: 0.95;
      letter-spacing: -0.04em;
      text-transform: uppercase;
      overflow-wrap: break-word;
      word-break: break-word;
    }

    .build-copy {
      color: var(--muted);
      font-size: clamp(0.92rem, 1.15vw, 1.05rem);
      line-height: 1.45;
      max-width: 40ch;
      overflow-wrap: break-word;
    }

    .build-item:hover .build-copy {
      color: var(--bg);
      opacity: 0.55;
    }

    /* FIT */
    .fit-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 5vw;
      align-items: start;
      min-width: 0;
    }

    .fit-col {
      border-top: 1px solid var(--line);
      padding-top: 1.5rem;
      min-width: 0;
    }

    .fit-col-title {
      font-family: 'SF Mono', 'Fira Code', Consolas, monospace;
      font-size: 0.68rem;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      color: var(--muted);
      margin-bottom: 2rem;
    }

    .fit-item {
      padding: 1.4rem 0;
      border-bottom: 1px solid var(--line);
      font-size: clamp(1rem, 1.4vw, 1.2rem);
      line-height: 1.35;
      overflow-wrap: break-word;
      min-width: 0;
    }

    .fit-item strong {
      display: block;
      margin-bottom: 0.4rem;
      font-weight: 600;
      text-transform: uppercase;
    }

    .fit-item span {
      color: var(--muted);
    }

    /* CAPABILITIES */
    .builder-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 6vw;
      align-items: start;
      min-width: 0;
    }

    .builder-statement {
      font-size: clamp(1.6rem, 3.8vw, 3.6rem);
      font-weight: 600;
      line-height: 1.02;
      letter-spacing: -0.045em;
      text-transform: uppercase;
      max-width: 22ch;
      overflow-wrap: break-word;
      min-width: 0;
    }

    .builder-statement .muted {
      color: var(--muted);
    }

    .builder-facts {
      border-top: 1px solid var(--line);
      min-width: 0;
    }

    .builder-fact {
      display: flex;
      justify-content: space-between;
      gap: 1.5rem;
      padding: 1.15rem 0;
      border-bottom: 1px solid var(--line);
      font-size: 0.88rem;
      font-family: 'SF Mono', 'Fira Code', Consolas, monospace;
      letter-spacing: 0.04em;
      text-transform: uppercase;
      min-width: 0;
      flex-wrap: wrap;
    }

    .builder-fact span:first-child {
      color: var(--muted);
    }

    .builder-fact span:last-child {
      text-align: right;
      overflow-wrap: break-word;
    }

    /* CTA */
    .about-cta {
      min-height: 70vh;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      padding-top: var(--section-gap);
      padding-bottom: 2rem;
    }

    .about-cta-title {
      font-size: clamp(2.8rem, 9vw, 9rem);
      font-weight: 700;
      line-height: 0.86;
      letter-spacing: -0.02em;
      text-transform: uppercase;
      max-width: 1200px;
      overflow-wrap: break-word;
      word-break: break-word;
    }

    .about-cta-title .muted {
      color: var(--muted);
    }

    .about-cta-bottom {
      display: flex;
      justify-content: space-between;
      align-items: flex-end;
      gap: 3rem;
      margin-top: var(--section-gap-sm);
      min-width: 0;
      flex-wrap: wrap;
    }

    .about-cta-copy {
      max-width: 42ch;
      font-size: clamp(0.95rem, 1.35vw, 1.15rem);
      line-height: 1.45;
      color: var(--muted);
      overflow-wrap: break-word;
      min-width: 0;
    }

    .about-cta-link {
      display: inline-flex;
      align-items: center;
      gap: 0.8rem;
      font-family: 'SF Mono', 'Fira Code', Consolas, monospace;
      font-size: 0.75rem;
      font-weight: 500;
      letter-spacing: 0.1em;
      text-transform: uppercase;
      text-decoration: none;
      border: 1px solid var(--text);
      padding: 0.85rem 1.15rem;
      min-height: 44px;
      -webkit-tap-highlight-color: transparent;
      transition: background-color var(--fast-transition), color var(--fast-transition), gap var(--fast-transition);
      white-space: nowrap;
    }

    .about-cta-link:hover,
    .about-cta-link:focus-visible {
      background: var(--text);
      color: var(--bg);
      gap: 1.15rem;
      outline: none;
    }

    /* FOOTER */
    footer {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 1.2rem var(--pad) calc(1.2rem + env(safe-area-inset-bottom, 0px));
      border-top: 1px solid var(--line);
      font-family: 'SF Mono', 'Fira Code', Consolas, monospace;
      font-size: 0.65rem;
      letter-spacing: 0.06em;
      text-transform: uppercase;
      color: var(--muted);
      gap: 1rem;
      flex-wrap: wrap;
      min-width: 0;
    }

    footer a {
      text-decoration: none;
      color: inherit;
      white-space: nowrap;
    }

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

    * { border-radius: 0 !important; }

    /* MOBILE */
    @media (max-width: 900px) {
      :root {
        --section-gap: 6rem;
        --section-gap-sm: 3.5rem;
      }

      .how-head,
      .fit-grid,
      .builder-grid,
      .build-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
      }

      .how-intro { justify-self: start; }

      .about-hero-bottom {
        grid-template-columns: 1fr;
        gap: 2rem;
        align-items: start;
      }

      .about-cta-bottom {
        flex-direction: column;
        align-items: flex-start;
        gap: 2rem;
      }

      .how-row {
        grid-template-columns: 45px 1fr;
        gap: 1rem;
      }

      .how-copy {
        grid-column: 2;
        padding-top: 0.4rem;
      }

      .build-item {
        min-height: 200px;
        padding: 1.5rem;
      }
    }

    @media (max-width: 600px) {
      .about-hero-top {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.8rem;
        margin-bottom: 2rem;
      }

      .builder-fact {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.25rem;
        font-size: 0.78rem;
      }

      .builder-fact span:last-child {
        text-align: left;
        opacity: 0.75;
      }

      .about-hero {
        justify-content: center;
        padding-top: calc(6.5rem + env(safe-area-inset-top, 0px));
        padding-bottom: calc(3rem + env(safe-area-inset-bottom, 0px));
      }

      .about-hero-title {
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
        letter-spacing: -0.05em;
        line-height: 0.94;
      }

      .about-hero-title .slash {
        display: none;
      }

      .about-hero-title > span:first-child {
        margin-bottom: 0.06em;
      }

      .about-hero-title .right {
        margin-left: 0;
        align-self: flex-start;
        color: var(--muted);
        -webkit-text-stroke: 0;
        font-size: 0.55em;
        line-height: 1.05;
        margin-top: 0.4em;
        letter-spacing: -0.03em;
        white-space: normal;
      }

      .about-hero-title .right br {
        display: none;
      }

      body.dark .about-hero-title .right {
        -webkit-text-stroke-color: transparent;
        color: var(--muted);
      }

      .about-hero-bottom {
        margin-top: 1.2rem;
      }
    }

    @media (max-width: 480px) {
      :root {
        --pad: 12px;
        --header-pad: 10px;
        --section-gap: 4.5rem;
        --section-gap-sm: 2.5rem;
      }

      .about-hero {
        padding-top: calc(5.5rem + env(safe-area-inset-top, 0px));
      }

      .about-hero-title {
        font-size: clamp(2.4rem, 15vw, 4.2rem);
        letter-spacing: -0.05em;
      }

      .about-hero-title .right {
        font-size: 0.55em;
      }

      .about-hero-kicker {
        font-size: 0.62rem;
      }

      .about-hero-copy {
        font-size: clamp(1rem, 4.6vw, 1.2rem);
      }

      .about-hero-copy .muted {
        font-size: 0.88rem;
      }

      .how-title {
        font-size: clamp(1.8rem, 9vw, 3rem);
      }

      .how-name {
        font-size: clamp(1.15rem, 5.5vw, 1.6rem);
      }

      .how-copy,
      .how-intro,
      .fit-item,
      .build-copy,
      .about-cta-copy {
        font-size: 0.92rem;
        line-height: 1.5;
      }

      .build-item {
        min-height: 180px;
        padding: 1.3rem;
      }

      .build-title {
        font-size: clamp(1.15rem, 6vw, 1.7rem);
      }

      .builder-statement {
        font-size: clamp(1.4rem, 6.5vw, 2rem);
      }

      .builder-fact {
        font-size: 0.72rem;
        letter-spacing: 0.03em;
      }

      .about-cta-title {
        font-size: clamp(2rem, 12vw, 4rem);
        letter-spacing: 0;
      }

      .about-cta-link {
        font-size: 0.7rem;
        padding: 0.75rem 1rem;
        gap: 0.6rem;
      }

      footer {
        font-size: 0.6rem;
      }

      .kicker {
        font-size: 0.62rem;
        letter-spacing: 0.08em;
      }
    }

    @media (max-width: 360px) {
      .header-right {
        font-size: 0.6rem;
        gap: 0.3rem;
      }

      .about-hero-title {
        font-size: clamp(2rem, 14vw, 3.2rem);
      }

      .builder-fact {
        font-size: 0.68rem;
      }
    }

    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
      }
    }

/* Fixed top guard line. */
.header-line {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--bg);
  pointer-events: none;
  z-index: 61;
}