/* =========================================================
       ARUS ROBOTICS — SYSTEMS PAGE
       ========================================================= */

    :root {
      --paper: #f2f0e9;
      --paper-2: #e6e3da;
      --paper-3: #d8d5cb;

      --ink: #10110f;
      --ink-soft: #3f423d;
      --muted: #797b74;

      --blue: #1648ff;
      --orange: #ff5a1f;
      --acid: #d7ff38;

      --white: #fff;

      --line: rgba(16, 17, 15, 0.17);
      --line-strong: rgba(16, 17, 15, 0.5);

      --max: 1500px;
      --gutter: 38px;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      background: var(--paper);
      color: var(--ink);

      font-family:
        Arial,
        Helvetica,
        sans-serif;

      -webkit-font-smoothing: antialiased;

      overflow-x: hidden;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

    button {
      font: inherit;
    }

    svg {
      display: block;
    }

    ::selection {
      color: white;
      background: var(--blue);
    }

    .container {
      width: min(
        calc(100% - (var(--gutter) * 2)),
        var(--max)
      );

      margin-inline: auto;
    }

    .mono {
      font-family:
        "Courier New",
        Courier,
        monospace;
    }

    /* =========================================================
       TYPOGRAPHY
       ========================================================= */

    .display {
      font-size: clamp(72px, 10vw, 168px);

      font-weight: 800;

      line-height: 0.8;
      letter-spacing: -0.085em;

      text-transform: uppercase;
    }

    .display-medium {
      font-size: clamp(52px, 7vw, 108px);

      font-weight: 800;

      line-height: 0.85;
      letter-spacing: -0.07em;

      text-transform: uppercase;
    }

    .heading {
      font-size: clamp(36px, 4vw, 64px);

      line-height: 0.95;

      font-weight: 750;

      letter-spacing: -0.055em;
    }

    .eyebrow {
      font-family:
        "Courier New",
        Courier,
        monospace;

      display: flex;
      align-items: center;
      gap: 10px;

      font-size: 10px;

      text-transform: uppercase;
      letter-spacing: 0.08em;
    }

    .eyebrow::before {
      content: "";

      width: 7px;
      height: 7px;

      background: var(--orange);
    }

    .section-index {
      font-family:
        "Courier New",
        Courier,
        monospace;

      font-size: 10px;

      text-transform: uppercase;
      letter-spacing: 0.08em;

      color: var(--muted);
    }

    /* =========================================================
       NAV
       ========================================================= */

    .nav {
      position: fixed;

      top: 0;
      left: 0;

      width: 100%;

      z-index: 100;

      border-bottom: 1px solid transparent;

      transition:
        background 0.25s ease,
        border-color 0.25s ease;
    }

    .nav.scrolled {
      background: rgba(242, 240, 233, 0.95);

      backdrop-filter: blur(10px);

      border-color: var(--line);
    }

    .nav-inner {
      min-height: 86px;

      display: grid;

      grid-template-columns:
        230px
        1fr
        auto;

      gap: 30px;

      align-items: center;
    }

    .brand {
      display: flex;
      align-items: center;

      gap: 13px;

      font-size: 20px;

      font-weight: 800;

      letter-spacing: -0.04em;
    }

    .brand-mark {
      width: 34px;
      height: 34px;

      background: var(--ink);

      position: relative;
    }

    .brand-mark::before {
      content: "";

      position: absolute;

      top: 0;
      right: 0;

      width: 12px;
      height: 12px;

      background: var(--orange);
    }

    .brand-mark::after {
      content: "";

      position: absolute;

      left: 6px;
      bottom: 6px;

      width: 7px;
      height: 18px;

      background: var(--paper);
    }

    .nav-links {
      display: flex;

      justify-content: center;

      gap: 34px;

      font-size: 11px;

      text-transform: uppercase;
      letter-spacing: 0.05em;
    }

    .nav-links a {
      opacity: 0.65;

      transition: opacity 0.2s ease;
    }

    .nav-links a:hover,
    .nav-links a.active {
      opacity: 1;
    }

    .nav-links a.active {
      font-weight: 700;
    }

    .nav-cta {
      display: inline-flex;

      align-items: center;
      justify-content: center;

      min-height: 44px;

      padding-inline: 18px;

      border: 1px solid var(--ink);

      font-size: 10px;

      text-transform: uppercase;
      letter-spacing: 0.06em;

      transition:
        background 0.2s ease,
        color 0.2s ease;
    }

    .nav-cta:hover {
      background: var(--ink);
      color: var(--paper);
    }

    /* =========================================================
       HERO
       ========================================================= */

    .hero {
      padding-top: 86px;

      border-bottom: 1px solid var(--ink);
    }

    .hero-grid {
      min-height: 780px;

      display: grid;

      grid-template-columns:
        minmax(0, 1.3fr)
        minmax(340px, 0.7fr);

      border-left: 1px solid var(--ink);
      border-right: 1px solid var(--ink);
    }

    .hero-main {
      padding: 70px 45px 45px;

      border-right: 1px solid var(--ink);

      display: flex;
      flex-direction: column;
    }

    .hero-label-row {
      display: flex;
      justify-content: space-between;

      gap: 20px;

      margin-bottom: 70px;
    }

    .hero h1 {
      max-width: 1050px;
    }

    .hero h1 span {
      display: block;
    }

    .hero h1 .blue {
      color: var(--blue);
    }

    .hero-bottom {
      margin-top: auto;

      padding-top: 70px;

      display: grid;

      grid-template-columns:
        minmax(0, 1fr)
        220px;

      gap: 50px;

      align-items: end;
    }

    .hero-description {
      max-width: 650px;

      font-size: clamp(19px, 1.8vw, 28px);

      line-height: 1.32;

      letter-spacing: -0.03em;
    }

    .hero-scroll {
      font-family:
        "Courier New",
        Courier,
        monospace;

      font-size: 9px;

      text-transform: uppercase;
      letter-spacing: 0.08em;

      display: flex;

      flex-direction: column;

      gap: 14px;
    }

    .scroll-line {
      width: 100%;
      height: 1px;

      background: var(--ink);

      position: relative;

      overflow: hidden;
    }

    .scroll-line::after {
      content: "";

      position: absolute;

      top: 0;
      left: 0;

      height: 100%;
      width: 30%;

      background: var(--orange);

      animation: scrollIndicator 2s ease-in-out infinite;
    }

    @keyframes scrollIndicator {
      0% {
        transform: translateX(-100%);
      }

      100% {
        transform: translateX(420%);
      }
    }

    /* HERO INDEX */

    .hero-index {
      display: grid;

      grid-template-rows:
        repeat(3, 1fr);
    }

    .hero-index-item {
      padding: 28px;

      border-bottom: 1px solid var(--ink);

      display: flex;
      flex-direction: column;

      justify-content: space-between;

      position: relative;

      overflow: hidden;

      transition:
        background 0.25s ease,
        color 0.25s ease;
    }

    .hero-index-item:last-child {
      border-bottom: none;
    }

    .hero-index-item:hover {
      background: var(--ink);
      color: var(--paper);
    }

    .index-top {
      display: flex;

      justify-content: space-between;

      font-family:
        "Courier New",
        monospace;

      font-size: 9px;

      text-transform: uppercase;
    }

    .index-name {
      font-size: clamp(30px, 3vw, 50px);

      line-height: 0.95;

      font-weight: 750;

      letter-spacing: -0.055em;

      text-transform: uppercase;
    }

    .index-meta {
      display: flex;

      gap: 10px;

      flex-wrap: wrap;
    }

    .index-tag {
      border: 1px solid currentColor;

      padding: 5px 7px;

      font-size: 8px;

      font-family:
        "Courier New",
        monospace;

      text-transform: uppercase;
    }

    /* =========================================================
       SYSTEM NAV STRIP
       ========================================================= */

    .system-strip {
      border-bottom: 1px solid var(--ink);

      background: var(--acid);
    }

    .strip-inner {
      min-height: 63px;

      display: grid;

      grid-template-columns:
        180px
        repeat(3, 1fr);

      border-left: 1px solid var(--ink);
      border-right: 1px solid var(--ink);
    }

    .strip-label,
    .strip-link {
      display: flex;

      align-items: center;

      padding-inline: 18px;

      border-right: 1px solid var(--ink);

      font-size: 10px;

      font-family:
        "Courier New",
        monospace;

      text-transform: uppercase;
      letter-spacing: 0.06em;
    }

    .strip-link:last-child {
      border-right: none;
    }

    .strip-link {
      justify-content: space-between;

      transition:
        background 0.2s ease,
        color 0.2s ease;
    }

    .strip-link:hover {
      background: var(--ink);
      color: var(--paper);
    }

    /* =========================================================
       PRODUCT SECTION
       ========================================================= */

    .product {
      border-bottom: 1px solid var(--ink);
    }

    .product-header {
      padding: 105px 0 55px;

      display: grid;

      grid-template-columns:
        230px
        1fr;

      gap: 70px;
    }

    .product-header-content {
      display: grid;

      grid-template-columns:
        minmax(0, 1fr)
        380px;

      gap: 70px;

      align-items: end;
    }

    .product-header-copy {
      font-size: 16px;

      line-height: 1.65;

      color: var(--ink-soft);
    }

    .product-shell {
      display: grid;

      grid-template-columns:
        minmax(0, 1.35fr)
        minmax(340px, 0.65fr);

      border-top: 1px solid var(--ink);

      border-left: 1px solid var(--ink);
      border-right: 1px solid var(--ink);
    }

    .product-visual {
      min-height: 760px;

      background: var(--paper-2);

      border-right: 1px solid var(--ink);

      position: relative;

      overflow: hidden;
    }

    .technical-grid {
      position: absolute;
      inset: 0;

      background-image:
        linear-gradient(
          rgba(16,17,15,0.07) 1px,
          transparent 1px
        ),
        linear-gradient(
          90deg,
          rgba(16,17,15,0.07) 1px,
          transparent 1px
        );

      background-size: 50px 50px;
    }

    .visual-label {
      position: absolute;

      top: 20px;
      left: 20px;

      z-index: 2;

      font-family:
        "Courier New",
        monospace;

      font-size: 9px;

      text-transform: uppercase;
      letter-spacing: 0.07em;
    }

    .visual-rev {
      position: absolute;

      right: 20px;
      top: 20px;

      font-family:
        "Courier New",
        monospace;

      font-size: 9px;

      text-transform: uppercase;
    }

    .robot-svg {
      position: absolute;

      width: 94%;
      height: 94%;

      left: 3%;
      top: 3%;
    }

    .product-info {
      display: flex;
      flex-direction: column;
    }

    .info-block {
      padding: 27px;

      border-bottom: 1px solid var(--ink);
    }

    .info-block:last-child {
      border-bottom: none;
    }

    .info-title {
      font-family:
        "Courier New",
        monospace;

      font-size: 9px;

      text-transform: uppercase;
      letter-spacing: 0.07em;

      color: var(--muted);

      margin-bottom: 20px;
    }

    .info-main {
      font-size: 21px;

      line-height: 1.3;

      letter-spacing: -0.025em;
    }

    .spec-grid {
      display: grid;

      grid-template-columns:
        1fr
        1fr;

      border-top: 1px solid var(--ink);
      border-left: 1px solid var(--ink);
    }

    .spec {
      padding: 20px;

      border-right: 1px solid var(--ink);
      border-bottom: 1px solid var(--ink);
    }

    .spec-label {
      font-family:
        "Courier New",
        monospace;

      font-size: 8px;

      text-transform: uppercase;
      letter-spacing: 0.06em;

      color: var(--muted);

      margin-bottom: 13px;
    }

    .spec-value {
      font-size: 25px;

      font-weight: 700;

      letter-spacing: -0.04em;
    }

    .product-features {
      display: flex;

      flex-direction: column;
    }

    .feature-row {
      min-height: 76px;

      border-bottom: 1px solid var(--ink);

      display: grid;

      grid-template-columns:
        45px
        1fr;

      align-items: center;

      gap: 10px;

      padding-inline: 20px;

      font-size: 12px;
    }

    .feature-row:last-child {
      border-bottom: none;
    }

    .feature-num {
      font-family:
        "Courier New",
        monospace;

      font-size: 9px;

      color: var(--muted);
    }

    /* =========================================================
       HUMANOID DARK VARIANT
       ========================================================= */

    .product.dark {
      background: var(--ink);

      color: var(--paper);
    }

    .product.dark .section-index,
    .product.dark .product-header-copy {
      color: rgba(242,240,233,0.55);
    }

    .product.dark .product-shell,
    .product.dark .product-visual,
    .product.dark .info-block,
    .product.dark .spec-grid,
    .product.dark .spec,
    .product.dark .feature-row {
      border-color: rgba(242,240,233,0.35);
    }

    .product.dark .product-visual {
      background: #1b1d1a;
    }

    .product.dark .technical-grid {
      background-image:
        linear-gradient(
          rgba(255,255,255,0.05) 1px,
          transparent 1px
        ),
        linear-gradient(
          90deg,
          rgba(255,255,255,0.05) 1px,
          transparent 1px
        );
    }

    .product.dark .info-title,
    .product.dark .spec-label,
    .product.dark .feature-num {
      color: rgba(242,240,233,0.45);
    }

    /* =========================================================
       ARCHITECTURE
       ========================================================= */

    .architecture {
      padding: 140px 0;

      border-bottom: 1px solid var(--ink);
    }

    .architecture-header {
      display: grid;

      grid-template-columns:
        230px
        1fr;

      gap: 70px;

      margin-bottom: 80px;
    }

    .architecture-content {
      display: grid;

      grid-template-columns:
        1fr
        0.7fr;

      gap: 80px;
    }

    .architecture-content p {
      max-width: 550px;

      font-size: 17px;

      line-height: 1.6;

      color: var(--ink-soft);
    }

    .architecture-map {
      margin-top: 80px;

      display: grid;

      grid-template-columns:
        repeat(5, 1fr);

      border-top: 1px solid var(--ink);
      border-left: 1px solid var(--ink);
    }

    .architecture-node {
      min-height: 210px;

      padding: 22px;

      border-right: 1px solid var(--ink);
      border-bottom: 1px solid var(--ink);

      display: flex;

      flex-direction: column;
      justify-content: space-between;

      position: relative;

      transition:
        background 0.2s ease,
        color 0.2s ease;
    }

    .architecture-node:hover {
      background: var(--blue);
      color: white;
    }

    .node-num {
      font-family:
        "Courier New",
        monospace;

      font-size: 8px;

      text-transform: uppercase;
    }

    .node-name {
      font-size: 19px;

      font-weight: 700;

      text-transform: uppercase;

      line-height: 1;

      letter-spacing: -0.04em;
    }

    .node-state {
      font-family:
        "Courier New",
        monospace;

      font-size: 8px;

      text-transform: uppercase;
    }

    /* =========================================================
       COMPARISON
       ========================================================= */

    .comparison {
      background: var(--blue);

      color: white;

      padding: 130px 0;
    }

    .comparison-top {
      display: grid;

      grid-template-columns:
        230px
        1fr;

      gap: 70px;

      margin-bottom: 70px;
    }

    .comparison .section-index {
      color: rgba(255,255,255,0.6);
    }

    .comparison-table {
      border-top: 1px solid rgba(255,255,255,0.5);
      border-left: 1px solid rgba(255,255,255,0.5);
    }

    .comparison-row {
      display: grid;

      grid-template-columns:
        1.1fr
        repeat(3, 1fr);
    }

    .comparison-cell {
      min-height: 80px;

      padding: 18px;

      border-right: 1px solid rgba(255,255,255,0.5);
      border-bottom: 1px solid rgba(255,255,255,0.5);

      display: flex;
      align-items: center;

      font-size: 12px;
    }

    .comparison-row.header .comparison-cell {
      min-height: 130px;

      align-items: flex-end;

      font-size: 20px;

      font-weight: 700;

      text-transform: uppercase;

      letter-spacing: -0.04em;
    }

    .comparison-row:not(.header)
    .comparison-cell:first-child {
      font-family:
        "Courier New",
        monospace;

      font-size: 9px;

      text-transform: uppercase;
      letter-spacing: 0.06em;

      opacity: 0.75;
    }

    .dot {
      width: 10px;
      height: 10px;

      background: var(--acid);
    }

    .dash {
      width: 17px;
      height: 1px;

      background: rgba(255,255,255,0.45);
    }

    /* =========================================================
       CTA
       ========================================================= */

    .cta {
      border-bottom: 1px solid var(--ink);
    }

    .cta-grid {
      min-height: 600px;

      display: grid;

      grid-template-columns:
        1.2fr
        0.8fr;

      border-left: 1px solid var(--ink);
      border-right: 1px solid var(--ink);
    }

    .cta-copy {
      padding: 80px 55px;

      border-right: 1px solid var(--ink);

      display: flex;
      flex-direction: column;

      justify-content: space-between;
    }

    .cta-copy h2 {
      max-width: 850px;
    }

    .cta-copy h2 span {
      color: var(--blue);
    }

    .cta-bottom {
      display: grid;

      grid-template-columns:
        1fr
        240px;

      gap: 50px;

      align-items: end;
    }

    .cta-bottom p {
      max-width: 580px;

      font-size: 17px;

      line-height: 1.6;

      color: var(--ink-soft);
    }

    .button {
      min-height: 56px;

      padding-inline: 18px;

      display: flex;

      align-items: center;
      justify-content: space-between;

      border: 1px solid var(--ink);

      font-size: 10px;

      text-transform: uppercase;
      letter-spacing: 0.05em;

      transition:
        background 0.2s ease,
        color 0.2s ease,
        transform 0.2s ease;
    }

    .button:hover {
      transform: translateX(4px);
    }

    .button.blue {
      background: var(--blue);

      border-color: var(--blue);

      color: white;
    }

    .button.blue:hover {
      background: var(--ink);

      border-color: var(--ink);
    }

    .cta-panel {
      background: var(--orange);

      padding: 40px;

      display: flex;
      flex-direction: column;

      justify-content: space-between;
    }

    .cta-panel-top {
      font-family:
        "Courier New",
        monospace;

      font-size: 9px;

      text-transform: uppercase;
    }

    .cta-panel-message {
      font-size: clamp(31px, 4vw, 60px);

      font-weight: 750;

      text-transform: uppercase;

      line-height: 0.92;

      letter-spacing: -0.06em;
    }

    /* =========================================================
       FOOTER
       ========================================================= */

    footer {
      background: var(--ink);

      color: var(--paper);

      padding: 70px 0 25px;
    }

    .footer-grid {
      display: grid;

      grid-template-columns:
        1.4fr
        repeat(3, 1fr);

      gap: 50px;
    }

    .footer-brand p {
      margin-top: 25px;

      max-width: 350px;

      font-size: 13px;

      line-height: 1.6;

      color: rgba(242,240,233,0.55);
    }

    .footer-column h4 {
      margin-bottom: 20px;

      font-family:
        "Courier New",
        monospace;

      font-size: 9px;

      text-transform: uppercase;

      color: rgba(242,240,233,0.4);
    }

    .footer-column a {
      display: block;

      margin-bottom: 12px;

      font-size: 13px;

      color: rgba(242,240,233,0.72);
    }

    .footer-column a:hover {
      color: white;
    }

    .footer-bottom {
      margin-top: 70px;

      padding-top: 22px;

      border-top: 1px solid rgba(255,255,255,0.16);

      display: flex;
      justify-content: space-between;

      gap: 20px;

      font-family:
        "Courier New",
        monospace;

      font-size: 9px;

      color: rgba(242,240,233,0.4);

      text-transform: uppercase;
    }

    /* =========================================================
       REVEAL
       ========================================================= */

    .motion-ready .reveal {
      opacity: 0;

      transform: translateY(25px);

      transition:
        opacity 0.7s ease,
        transform 0.7s ease;
    }

    .motion-ready .reveal.visible {
      opacity: 1;
      transform: translateY(0);
    }

    /* =========================================================
       RESPONSIVE
       ========================================================= */

    @media (max-width: 1150px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }

      .hero-main {
        min-height: 750px;

        border-right: none;

        border-bottom: 1px solid var(--ink);
      }

      .hero-index {
        grid-template-columns: repeat(3, 1fr);

        grid-template-rows: none;
      }

      .hero-index-item {
        min-height: 300px;

        border-bottom: none;
        border-right: 1px solid var(--ink);
      }

      .hero-index-item:last-child {
        border-right: none;
      }

      .product-header-content {
        grid-template-columns: 1fr;
      }

      .product-shell {
        grid-template-columns: 1fr;
      }

      .product-visual {
        border-right: none;
        border-bottom: 1px solid var(--ink);
      }

      .architecture-map {
        grid-template-columns:
          repeat(3, 1fr);
      }

      .cta-grid {
        grid-template-columns: 1fr;
      }

      .cta-copy {
        min-height: 600px;

        border-right: none;

        border-bottom: 1px solid var(--ink);
      }

      .cta-panel {
        min-height: 320px;
      }
    }

    @media (max-width: 850px) {
      :root {
        --gutter: 18px;
      }

      .nav-inner {
        min-height: 72px;

        grid-template-columns:
          1fr
          auto;
      }

      .nav-links {
        display: none;
      }

      .hero {
        padding-top: 72px;
      }

      .hero-main {
        padding: 50px 24px 30px;

        min-height: 680px;
      }

      .hero-label-row {
        margin-bottom: 50px;
      }

      .hero-bottom {
        grid-template-columns: 1fr;
      }

      .hero-index {
        grid-template-columns: 1fr;
      }

      .hero-index-item {
        min-height: 240px;

        border-right: none;
        border-bottom: 1px solid var(--ink);
      }

      .strip-inner {
        grid-template-columns: 1fr;
      }

      .strip-label,
      .strip-link {
        min-height: 52px;

        border-right: none;

        border-bottom: 1px solid var(--ink);
      }

      .strip-link:last-child {
        border-bottom: none;
      }

      .product-header,
      .architecture-header,
      .comparison-top {
        grid-template-columns: 1fr;

        gap: 30px;
      }

      .product-header {
        padding-top: 80px;
      }

      .product-visual {
        min-height: 580px;
      }

      .architecture {
        padding: 100px 0;
      }

      .architecture-content {
        grid-template-columns: 1fr;
      }

      .architecture-map {
        grid-template-columns: 1fr 1fr;
      }

      .comparison-row {
        grid-template-columns:
          130px
          repeat(3, 1fr);
      }

      .comparison-cell {
        padding: 12px;

        font-size: 10px;
      }

      .comparison-row.header
      .comparison-cell {
        font-size: 14px;
      }

      .cta-copy {
        padding: 60px 26px;
      }

      .cta-bottom {
        grid-template-columns: 1fr;
      }

      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }

      .footer-brand {
        grid-column: 1 / -1;
      }
    }

    @media (max-width: 560px) {
      .display {
        font-size: clamp(50px, 15vw, 70px);
      }

      .display-medium {
        font-size: clamp(42px, 13vw, 58px);
      }

      .product-visual {
        min-height: 480px;
      }

      .spec-grid {
        grid-template-columns: 1fr;
      }

      .architecture-map {
        grid-template-columns: 1fr;
      }

      .comparison {
        overflow-x: hidden;
      }

      .comparison-table {
        min-width: 700px;
      }

      .comparison .container {
        overflow-x: auto;
      }

      .footer-grid {
        grid-template-columns: 1fr;
      }

      .footer-brand {
        grid-column: auto;
      }

      .footer-bottom {
        flex-direction: column;
      }
    }