:root {
      --font-body: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
      --font-heading: 'Space Grotesk', var(--font-body);
      --g-light: #7ee787;
      --g-mid: #3fb950;
      --g-dark: #0a1f16;
      --g-card: rgba(12, 40, 28, 0.92);
      --g-text: #e8f5ec;
      --g-muted: #9cc9a8;
      --g-line: rgba(126, 231, 135, 0.4);
      --g-grad: linear-gradient(135deg, #7ee787 0%, #3fb950 42%, #1f7a4f 100%);
    }
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: var(--font-body);
      font-size: 1.12rem;
      color: var(--g-text);
      background: var(--g-dark);
      background-image:
        radial-gradient(ellipse 80% 50% at 50% -10%, rgba(63, 185, 80, 0.12), transparent 55%),
        linear-gradient(rgba(126, 231, 135, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(126, 231, 135, 0.03) 1px, transparent 1px);
      background-size: 100% 100%, 56px 56px, 56px 56px;
      line-height: 1.75;
      min-height: 100vh;
    }

    /* Header: back left, brand center */
    .site-top {
      position: sticky;
      top: 0;
      z-index: 300;
      display: grid;
      grid-template-columns: minmax(140px, 1fr) auto minmax(140px, 1fr);
      align-items: center;
      gap: 16px;
      padding: 18px 32px;
      background: rgba(8, 14, 28, 0.96);
      backdrop-filter: blur(14px);
      border-bottom: 1px solid rgba(126, 231, 135, 0.2);
    }
    .back-btn {
      justify-self: start;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 12px 22px;
      border-radius: 999px;
      border: 1px solid var(--g-line);
      background: rgba(126, 231, 135, 0.08);
      color: var(--g-light);
      font-family: var(--font-heading);
      font-weight: 600;
      font-size: 1rem;
      text-decoration: none;
      transition: background 0.2s, border-color 0.2s;
      white-space: nowrap;
    }
    .back-btn:hover {
      background: rgba(126, 231, 135, 0.16);
      border-color: var(--g-mid);
    }
    .site-top__brand {
      justify-self: center;
      display: flex;
      align-items: center;
      gap: 20px;
      text-align: left;
    }
    .site-top__logo {
      width: clamp(88px, 10vw, 108px);
      height: clamp(88px, 10vw, 108px);
      object-fit: contain;
      flex-shrink: 0;
    }
    .site-top__name {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: clamp(1.65rem, 4.2vw, 2.35rem);
      color: #fff;
      line-height: 1.08;
      letter-spacing: -0.02em;
    }
    .site-top__name em {
      font-style: normal;
      background: linear-gradient(135deg, #22d3ee, #3fb950);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .site-top__tagline {
      display: block;
      font-size: clamp(0.78rem, 1.2vw, 0.92rem);
      font-weight: 600;
      letter-spacing: 0.18em;
      text-transform: uppercase;
      color: var(--g-muted);
      margin-top: 6px;
    }
    .site-top__spacer { justify-self: end; }

    .page-wrap {
      max-width: 1380px;
      margin: 0 auto;
      padding: 0 clamp(20px, 4vw, 48px);
    }

    .page-hero {
      padding: clamp(40px, 5vw, 64px) 0 clamp(28px, 4vw, 40px);
      display: grid;
      grid-template-columns: minmax(200px, 26%) 1fr;
      gap: clamp(32px, 5vw, 56px);
      align-items: center;
    }
    .page-hero__nestor-logo {
      height: auto;
      width: 100%;
      max-width: clamp(220px, 22vw, 320px);
      filter: drop-shadow(0 16px 40px rgba(63, 185, 80, 0.35));
    }
    .page-hero h1 {
      font-family: var(--font-heading);
      font-size: clamp(2.8rem, 6.5vw, 4.2rem);
      font-weight: 700;
      background: var(--g-grad);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 12px;
      line-height: 1.05;
      letter-spacing: -0.03em;
    }
    .page-hero .sub {
      color: var(--g-muted);
      text-transform: uppercase;
      letter-spacing: 0.08em;
      font-size: clamp(1.05rem, 1.8vw, 1.3rem);
      margin-bottom: 14px;
      font-weight: 500;
    }
    .page-hero .hi {
      color: var(--g-light);
      font-weight: 600;
      font-size: clamp(1.25rem, 2.2vw, 1.55rem);
      margin-bottom: 14px;
      line-height: 1.35;
    }
    .page-hero .intro {
      color: var(--g-text);
      font-size: clamp(1.1rem, 1.7vw, 1.35rem);
      line-height: 1.75;
      max-width: none;
    }

    .overview {
      padding-bottom: clamp(32px, 4vw, 48px);
    }
    .overview h2 {
      font-family: var(--font-heading);
      color: var(--g-light);
      font-size: clamp(1.75rem, 3vw, 2.25rem);
      margin-bottom: 22px;
    }
    .overview p {
      color: var(--g-muted);
      margin-bottom: 18px;
      font-size: clamp(1.08rem, 1.6vw, 1.28rem);
      line-height: 1.8;
      max-width: none;
    }

    .mindmap-section {
      padding: 16px 0 clamp(48px, 6vw, 80px);
    }
    .mindmap-section h2 {
      font-family: var(--font-heading);
      text-align: center;
      color: var(--g-light);
      font-size: clamp(2rem, 4vw, 2.75rem);
      margin-bottom: 12px;
    }
    .mindmap-hint {
      text-align: center;
      color: var(--g-muted);
      font-size: clamp(1rem, 1.4vw, 1.15rem);
      margin-bottom: 28px;
    }

    .mindmap-viewport {
      position: relative;
      width: 100%;
      height: min(78vh, 720px);
      min-height: 480px;
      border-radius: 28px;
      border: 1px solid rgba(126, 231, 135, 0.22);
      background: rgba(6, 18, 12, 0.65);
      overflow: hidden;
      cursor: grab;
      touch-action: none;
      box-shadow: inset 0 0 80px rgba(63, 185, 80, 0.06);
    }
    .mindmap-viewport.is-dragging { cursor: grabbing; }

    .mindmap-zoom-controls {
      position: absolute;
      top: 14px;
      right: 14px;
      z-index: 12;
      display: flex;
      gap: 8px;
      pointer-events: none;
    }
    .mindmap-zoom-controls button {
      pointer-events: auto;
      width: 38px;
      height: 38px;
      border-radius: 10px;
      border: 1px solid rgba(126, 231, 135, 0.35);
      background: rgba(6, 18, 12, 0.9);
      color: var(--g-light);
      font-family: var(--font-heading);
      font-size: 1.15rem;
      font-weight: 700;
      line-height: 1;
      cursor: pointer;
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
      transition: background 0.2s, border-color 0.2s;
    }
    .mindmap-zoom-controls button:hover {
      background: rgba(126, 231, 135, 0.16);
      border-color: var(--g-light);
    }
    .mindmap-zoom-controls button[data-zoom="reset"] { font-size: 0.95rem; }

    .mindmap-canvas {
      position: absolute;
      left: 50%;
      top: 50%;
      width: 960px;
      height: 740px;
      transform: translate(-50%, -50%);
      transform-origin: center center;
    }
    .mindmap-svg {
      position: absolute;
      inset: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
    }
    .mindmap-svg line {
      stroke: rgba(126, 231, 135, 0.22);
      stroke-width: 2;
      transition: stroke 0.25s, stroke-width 0.25s;
    }
    .mindmap-svg line.is-active {
      stroke: rgba(126, 231, 135, 0.8);
      stroke-width: 2.5;
      filter: drop-shadow(0 0 6px rgba(126, 231, 135, 0.5));
    }

    .mindmap-center {
      position: absolute;
      left: 50%;
      top: 50%;
      transform: translate(-50%, -50%);
      width: 148px;
      height: 148px;
      border-radius: 50%;
      border: 2px solid var(--g-line);
      background: radial-gradient(circle at 30% 30%, rgba(126, 231, 135, 0.2), rgba(8, 28, 18, 0.95));
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 8px;
      cursor: pointer;
      z-index: 5;
      box-shadow: 0 0 40px rgba(63, 185, 80, 0.2);
      transition: box-shadow 0.3s, border-color 0.3s;
    }
    .mindmap-center:hover,
    .mindmap-center.is-active {
      border-color: var(--g-light);
      box-shadow: 0 0 50px rgba(126, 231, 135, 0.35);
    }
    .mindmap-center img { width: 64px; height: auto; }
    .mindmap-center span {
      font-family: var(--font-heading);
      font-size: 0.82rem;
      font-weight: 700;
      color: var(--g-light);
      text-align: center;
      line-height: 1.2;
    }

    .mindmap-node {
      position: absolute;
      width: 110px;
      height: 110px;
      margin: -55px 0 0 -55px;
      border-radius: 50%;
      background: var(--g-card);
      border: 2px solid rgba(126, 231, 135, 0.25);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 5px;
      cursor: pointer;
      z-index: 4;
      padding: 8px;
      transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s, opacity 0.25s;
    }
    .mindmap-node svg {
      width: 30px;
      height: 30px;
      stroke: var(--g-light);
      fill: none;
      stroke-width: 1.8;
      stroke-linecap: round;
      stroke-linejoin: round;
    }
    .mindmap-node .node-label {
      font-family: var(--font-heading);
      font-size: 0.74rem;
      font-weight: 600;
      color: var(--g-light);
      text-align: center;
      line-height: 1.2;
      max-width: 98px;
      display: -webkit-box;
      -webkit-line-clamp: 2;
      -webkit-box-orient: vertical;
      overflow: hidden;
    }
    .mindmap-node:hover {
      transform: scale(1.1);
      border-color: var(--g-mid);
      box-shadow: 0 8px 28px rgba(63, 185, 80, 0.25);
      z-index: 6;
    }
    .mindmap-node.is-active {
      transform: scale(1.14);
      border-color: var(--g-light);
      box-shadow: 0 0 32px rgba(126, 231, 135, 0.45);
      z-index: 8;
    }
    .mindmap-node.is-dimmed { opacity: 0.35; }

    /* Floating popup beside node */
    .mindmap-popup {
      display: none;
      position: absolute;
      z-index: 50;
      width: min(340px, calc(100% - 24px));
      max-height: calc(100% - 24px);
      overflow-y: auto;
      scrollbar-width: none;
      -ms-overflow-style: none;
      padding: 22px 24px;
      border-radius: 18px;
      background: var(--g-card);
      border: 1px solid rgba(126, 231, 135, 0.35);
      box-shadow: 0 20px 56px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(126, 231, 135, 0.12);
      backdrop-filter: blur(12px);
      pointer-events: auto;
      animation: popupIn 0.28s cubic-bezier(0.22, 1, 0.36, 1);
    }
    .mindmap-popup.is-visible { display: block; }
    .mindmap-popup::-webkit-scrollbar {
      display: none;
      width: 0;
      height: 0;
    }
    .mindmap-popup.is-left::after,
    .mindmap-popup.is-right::after {
      content: '';
      position: absolute;
      top: 50%;
      width: 0;
      height: 0;
      border: 10px solid transparent;
      transform: translateY(-50%);
    }
    .mindmap-popup.is-right::after {
      right: 100%;
      border-right-color: rgba(12, 40, 28, 0.95);
      border-left: none;
      margin-right: -1px;
    }
    .mindmap-popup.is-left::after {
      left: 100%;
      border-left-color: rgba(12, 40, 28, 0.95);
      border-right: none;
      margin-left: -1px;
    }
    .mindmap-popup__close {
      position: absolute;
      top: 10px;
      right: 12px;
      background: none;
      border: none;
      color: var(--g-muted);
      font-size: 1.4rem;
      line-height: 1;
      cursor: pointer;
      padding: 4px;
    }
    .mindmap-popup__close:hover { color: var(--g-light); }
    .mindmap-popup h3 {
      font-family: var(--font-heading);
      font-size: 1.2rem;
      color: #fff;
      margin-bottom: 10px;
      padding-right: 28px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .mindmap-popup .pop-icon {
      width: 40px;
      height: 40px;
      border-radius: 10px;
      background: rgba(126, 231, 135, 0.12);
      border: 1px solid var(--g-line);
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
    }
    .mindmap-popup .pop-icon svg {
      width: 22px;
      height: 22px;
      stroke: var(--g-light);
      fill: none;
      stroke-width: 1.8;
    }
    .mindmap-popup .pop-summary {
      color: var(--g-light);
      font-size: 1rem;
      font-weight: 500;
      margin-bottom: 10px;
      line-height: 1.5;
    }
    .mindmap-popup .pop-detail {
      color: var(--g-muted);
      font-size: 0.95rem;
      line-height: 1.7;
    }
    .mindmap-popup ul {
      margin-top: 12px;
      padding-left: 18px;
      color: var(--g-light);
      font-size: 0.92rem;
    }

    @keyframes popupIn {
      from { opacity: 0; }
      to { opacity: 1; }
    }

    footer.page-foot {
      text-align: center;
      padding: 28px;
      color: var(--g-muted);
      font-size: 1rem;
      border-top: 1px solid rgba(126, 231, 135, 0.15);
    }

    @media (max-width: 768px) {
      .site-top {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto;
        gap: 12px;
        padding: 14px 16px;
      }
      .back-btn { justify-self: start; }
      .site-top__brand { justify-self: center; }
      .site-top__spacer { display: none; }
      .page-hero {
        grid-template-columns: 1fr;
        text-align: center;
      }
      .page-hero__nestor-logo { margin: 0 auto; }
      .mindmap-viewport { min-height: 400px; height: min(70vh, 560px); }
      .mindmap-node { width: 96px; height: 96px; margin: -48px 0 0 -48px; }
      .mindmap-node .node-label { font-size: 0.66rem; max-width: 88px; }
      .mindmap-popup {
        width: min(300px, 88vw);
        max-height: 70%;
        overflow-y: auto;
      }
      .mindmap-popup.is-left::after,
      .mindmap-popup.is-right::after { display: none; }
    }

    /* Mobile capabilities: Nestor leads a naturally scrolling branch list. */
    .capabilities-mobile-tree { display: none; }
    @media (max-width: 768px) {
      .mindmap-viewport {
        height: auto;
        min-height: 0;
        overflow: visible;
        border: 0;
        border-radius: 0;
        background: none;
        box-shadow: none;
        cursor: auto;
        touch-action: pan-y;
      }
      .mindmap-canvas, .mindmap-zoom-controls { display: none; }
      .capabilities-mobile-tree {
        --tree-gap: 24px;
        display: grid;
        grid-template-columns: clamp(64px, 18vw, 92px) minmax(0, 1fr);
        column-gap: var(--tree-gap);
        align-items: start;
        margin: 24px 0 8px;
        padding: 8px 0;
      }
      .capabilities-mobile-tree__leader {
        position: sticky;
        top: calc(var(--nestor-header-height, 220px) + 20px);
        display: flex;
        align-items: center;
        justify-content: center;
        width: 100%;
        aspect-ratio: 1;
        margin-top: 24px;
        border-radius: 50%;
        border: 2px solid var(--g-line);
        background: radial-gradient(circle at 30% 30%, #16462c, var(--g-dark) 75%);
        box-shadow: 0 0 24px rgba(63, 185, 80, 0.18);
      }
      .capabilities-mobile-tree__leader::after {
        content: '';
        position: absolute;
        left: 100%;
        top: 50%;
        width: calc(var(--tree-gap) / 2 + 2px);
        border-top: 2px solid var(--g-line);
      }
      .capabilities-mobile-tree__leader img {
        display: block;
        width: 76%;
        height: 76%;
        object-fit: contain;
        border-radius: 50%;
      }
      .capabilities-mobile-tree__branches {
        min-width: 0;
        list-style: none;
        margin: 0;
        padding: 0;
      }
      .capabilities-mobile-tree__branches > li {
        position: relative;
        padding: 7px 0;
      }
      .capabilities-mobile-tree__branches > li::before {
        content: '';
        position: absolute;
        left: calc(var(--tree-gap) / -2);
        top: 0;
        bottom: 0;
        border-left: 2px solid var(--g-line);
      }
      .capabilities-mobile-tree__branches > li:last-child::before { bottom: 50%; }
      .capabilities-mobile-tree__branches > li::after {
        content: '';
        position: absolute;
        left: calc(var(--tree-gap) / -2);
        top: 50%;
        width: calc(var(--tree-gap) / 2);
        border-top: 2px solid var(--g-line);
        pointer-events: none;
      }
      .capabilities-mobile-tree__capability {
        position: relative;
        display: flex;
        flex-direction: column;
        gap: 6px;
        width: 100%;
        min-height: 98px;
        padding: 13px 25px 13px 12px;
        border: 1px solid var(--g-line);
        border-left: 3px solid var(--g-mid);
        border-radius: 14px;
        background: var(--g-card);
        color: var(--g-text);
        font-family: var(--font-body);
        text-align: left;
        cursor: pointer;
        touch-action: pan-y;
      }
      .capabilities-mobile-tree__capability::after {
        content: '›';
        position: absolute;
        right: 10px;
        top: 50%;
        transform: translateY(-50%);
        color: var(--g-light);
        font-size: 1.4rem;
      }
      .capabilities-mobile-tree__capability:focus-visible {
        outline: 3px solid var(--g-light);
        outline-offset: 3px;
      }
      .capabilities-mobile-tree__capability.is-active { border-color: var(--g-light); }
      .capabilities-mobile-tree__title {
        font-family: var(--font-heading);
        font-weight: 700;
        font-size: 1rem;
        line-height: 1.35;
        overflow-wrap: anywhere;
      }
      .capabilities-mobile-tree__summary {
        color: var(--g-muted);
        font-size: 0.8rem;
        line-height: 1.5;
        overflow-wrap: anywhere;
      }
    }

    .back-btn,
    .mindmap-zoom-controls button,
    .nestor-hero__cta,
    .nestor-cta a {
      font-family: var(--font-body) !important;
    }