:root {
    --ink: #170c27;
    --paper: #e8eaf6;
    --amber: #883CF0;
    --steel: #23133a;
    --concrete: #f5f5f5;
    --grid: #ffffff;
  }

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

  html { scroll-behavior: smooth; }

  .ai-construction-hub {
    position: relative;
    background: #191127;
    color: var(--paper);
    overflow-x: hidden;
    cursor: none;
    height: 100vh;
  }

  /* Custom cursor */
  .cursor {
    width: 12px; height: 12px;
    background: var(--amber);
    border-radius: 50%;
    position: fixed; top: 0; left: 0;
    z-index: 2;
    pointer-events: none;
    transform: translate(-50%, -50%);
    transition: transform 0.1s, width 0.2s, height 0.2s, background 0.2s;
  }
  .cursor-ring {
    width: 36px; height: 36px;
    border: 1.5px solid #9f00f580;
    border-radius: 50%;
    position: fixed; top: 0; left: 0;
    z-index: 2;
    pointer-events: none;
    transform: translate(-50%, -50%);
    transition: all 0.15s ease-out;
    opacity: 0.6;
  }
  .ai-construction-hub:hover .cursor { opacity: 1; }

  /* ─── NOISE TEXTURE OVERLAY ─── */
  .ai-construction-hub::before {
    content: '';
    position: absolute; inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
    pointer-events: none; z-index: 1; opacity: 0.4;
  }

  /* ─── BLUEPRINT GRID BACKGROUND ─── */
  .blueprint-bg {
    position: absolute; inset: 0;
    background-image:
      linear-gradient(rgba(69, 42, 74, 0.2) 1px, transparent 1px),
      linear-gradient(90deg, rgba(70, 42, 74, 0.2) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none; z-index: 0;
    opacity: 0.5;
  }

  /* ─── NAV ─── */
  .ai-construction-hub nav {
    position: sticky; top: 0; left: 0; right: 0; z-index: 1;
    display: flex; align-items: center; justify-content: space-between;
    padding: 20px 48px;
    backdrop-filter: blur(12px);
    background: #180f26;
    border-bottom: 1px solid #3a1c63;
  }
  .nav-logo {
    
    font-size: 1.4rem;
    
    color: var(--amber);
    text-decoration: none;
  }
  .nav-logo span { color: var(--paper); }
  .nav-links { display: flex; gap: 32px; list-style: none; }
  .nav-links a {
    
    font-size: 0.7rem;
    
    text-transform: uppercase;
    color: var(--concrete);
    text-decoration: none;
    transition: color 0.2s;
  }
  .nav-links a:hover { color: var(--amber); }
  .nav-cta {
    
    font-size: 0.7rem;
    
    padding: 10px 22px;
    background: var(--amber);
    color: var(--ink);
    border: none;
    cursor: none;
    font-weight: 700;
    transition: background 0.2s, transform 0.15s;
  }
  .nav-cta:hover { background: #883cf0e0; transform: translateY(-1px); }

  /* ─── HERO ─── */
  #hero {
    position: relative; 
    min-height: 100vh;
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    padding: 120px 48px 80px;
    gap: 40px;
  }

  .hero-tag {
    
    font-size: 0.65rem;
    
    color: var(--amber);
    text-transform: uppercase;
    border-left: 2px solid var(--amber);
    padding-left: 12px;
    margin-bottom: 28px;
    animation: fadeUp 0.8s 0.2s both;
  }

  .hero-headline {
    
    font-size: clamp(4rem, 8vw, 7.5rem);
    line-height: 0.92;
    animation: fadeUp 0.8s 0.35s both;
  }
  .hero-headline .accent { color: var(--amber); }
  .hero-headline .outline {
    -webkit-text-stroke: 1px var(--paper);
    color: transparent;
  }

  .hero-sub {
    margin-top: 28px;
    font-size: 1rem;
    line-height: 1.7;
    color: var(--concrete);
    max-width: 440px;
    font-weight: 300;
    animation: fadeUp 0.8s 0.5s both;
  }

  .hero-actions {
    display: flex; gap: 16px; margin-top: 40px;
    animation: fadeUp 0.8s 0.65s both;
  }
  .btn-primary {
    padding: 14px 32px;
    background: var(--amber);
    color: var(--ink);
    
    font-size: 0.72rem;
    font-weight: 700;
    
    border: none; cursor: none;
    transition: all 0.2s;
  }
  .btn-primary:hover { background: #883cf0e0; transform: translateY(-2px); }
  .btn-ghost {
    padding: 14px 32px;
    background: transparent;
    color: var(--paper);
    
    font-size: 0.72rem;
    
    border: 1px solid #3a1c63;
    cursor: none;
    transition: all 0.2s;
  }
  .btn-ghost:hover { border-color: var(--amber); color: var(--amber); }

  /* Stats bar */
  .hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    margin-top: 60px;
    border-top: 1px solid #3a1c63;
    padding-top: 40px;
    animation: fadeUp 0.8s 0.8s both;
  }
  .stat { padding-right: 32px; }
  .stat + .stat { border-left: 1px solid #3a1c63; padding-left: 32px; padding-right: 0; }
  .stat-num {
    
    font-size: 2.8rem;
    color: var(--amber);
  }
  .stat-label {
    
    font-size: 0.62rem;
    
    text-transform: uppercase;
    color: var(--concrete);
    margin-top: 2px;
  }

  /* Hero visual side */
  .hero-visual {
    position: relative;
    animation: fadeIn 1.2s 0.4s both;
  }

  .blueprint-card {
    background: var(--steel);
    border: 1px solid #3a1c63;
    padding: 32px;
    position: relative;
    overflow: hidden;
  }
  .blueprint-card::before {
    content: '';
    position: absolute; inset: 0;
    background: 
      linear-gradient(rgba(209, 32, 232, 0.03) 1px, transparent 1px),
      linear-gradient(90deg, rgba(189, 32, 232, 0.03) 1px, transparent 1px);
    background-size: 20px 20px;
  }
  .bc-label {
    
    font-size: 0.6rem;
    color: var(--amber);
    text-transform: uppercase;
    margin-bottom: 20px;
    position: relative;
  }

  /* Building animation */
  .building-vis {
    display: flex; align-items: flex-end; gap: 8px;
    height: 160px;
    position: relative;
  }
  .bv-bar {
    flex: 1;
    background: linear-gradient(to top, var(--amber), #23133a);
    border-top: 2px solid var(--amber);
    animation: buildUp 1.5s ease-out both;
    position: relative;
    cursor: none;
  }
  .bv-bar::after {
    content: attr(data-label);
    position: absolute; bottom: -20px; left: 50%;
    transform: translateX(-50%);
    
    font-size: 0.5rem;
    color: var(--concrete);
    white-space: nowrap;
  }
  .bv-bar:nth-child(1) { height: 45%; animation-delay: 0.1s; }
  .bv-bar:nth-child(2) { height: 70%; animation-delay: 0.2s; }
  .bv-bar:nth-child(3) { height: 55%; animation-delay: 0.3s; }
  .bv-bar:nth-child(4) { height: 88%; animation-delay: 0.4s; }
  .bv-bar:nth-child(5) { height: 63%; animation-delay: 0.5s; }
  .bv-bar:nth-child(6) { height: 100%; animation-delay: 0.6s; }
  .bv-bar:hover { background: linear-gradient(to top, #684895, #6848957b); }

  .ai-nodes {
    display: flex; gap: 8px; margin-top: 40px; flex-wrap: wrap;
  }
  .ai-node {
    
    font-size: 0.58rem;
    padding: 6px 10px;
    border: 1px solid #3a1c63;
    color: var(--amber);
    
    animation: pulse 3s infinite;
  }
  .ai-node:nth-child(2) { animation-delay: 0.5s; }
  .ai-node:nth-child(3) { animation-delay: 1s; }
  .ai-node:nth-child(4) { animation-delay: 1.5s; }

  /* ─── SECTION COMMON ─── */
  section { position: relative; }

  .section-label {
    
    font-size: 0.62rem;
    
    text-transform: uppercase;
    color: var(--amber);
    margin-bottom: 16px;
  }
  .section-title {
    
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    line-height: 1;
  }

  /* ─── CAPABILITIES STRIP ─── */
  #capabilities {
    padding: 100px 48px;
    overflow: hidden;
  }

  .caps-header {
    display: flex; justify-content: space-between; align-items: flex-end;
    margin-bottom: 64px;
  }

  .caps-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1px;
    background: #2a1647;
  }
  .cap-card {
    background: var(--ink);
    padding: 40px 32px;
    border: 1px solid #23133a;
    position: relative;
    overflow: hidden;
    cursor: none;
    transition: background 0.3s;
  }
  .cap-card::before {
    content: '';
    position: absolute; top: 0; left: 0; right: 0;
    height: 2px;
    background: var(--amber);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s;
  }
  .cap-card:hover { background: #1f1232; }
  .cap-card:hover::before { transform: scaleX(1); }

  .cap-num {
    
    font-size: 4rem;
    color: rgba(215, 32, 232, 0.1);
    line-height: 1;
    margin-bottom: 12px;
    transition: color 0.3s;
  }
  .cap-card:hover .cap-num { color: rgba(202, 32, 232, 0.25); }
  .cap-title {
    
    font-size: 1.4rem;
    margin-bottom: 12px;
    color: var(--paper);
  }
  .cap-desc {
    font-size: 0.82rem;
    line-height: 1.65;
    color: var(--concrete);
    font-weight: 300;
  }
  .cap-tag {
    display: inline-block;
    margin-top: 20px;
    
    font-size: 0.58rem;
    
    color: var(--amber);
    border: 1px solid #3a1c63;
    padding: 4px 8px;
  }

  /* ─── INTERACTIVE EXPLORER ─── */
  #explorer {
    padding: 100px 48px;
    background: var(--steel);
    border-top: 1px solid #3a1c63;
    border-bottom: 1px solid #3a1c63;
  }
  .explorer-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2px;
    margin-top: 60px;
    background: #23133a;
  }
  .explorer-tabs {
    background: var(--ink);
    display: flex; flex-direction: column;
  }
  .explorer-tab {
    padding: 24px 28px;
    border-bottom: 1px solid #3a1c63;
    cursor: none;
    transition: all 0.2s;
    position: relative;
  }
  .explorer-tab::before {
    content: '';
    position: absolute; left: 0; top: 0; bottom: 0;
    width: 3px;
    background: var(--amber);
    transform: scaleY(0);
    transition: transform 0.3s;
  }
  .explorer-tab.active { background: #1f1232; }
  .explorer-tab.active::before { transform: scaleY(1); }
  .explorer-tab .et-label {
    
    font-size: 0.58rem;
    
    color: var(--concrete);
    text-transform: uppercase;
    margin-bottom: 6px;
  }
  .explorer-tab .et-title {
    
    font-size: 1.05rem;
    color: var(--paper);
    line-height: 1.2;
  }
  .explorer-tab.active .et-title { color: var(--amber); }
  .explorer-tab:hover { background: #2a1647; }

  .explorer-panel {
    background: var(--ink);
    padding: 48px;
    display: none;
  }
  .explorer-panel.active { display: block; }
  .ep-title {
    
    font-size: 2.4rem;
    margin-bottom: 8px;
  }
  .ep-subtitle {
    
    font-size: 0.65rem;
    
    color: var(--amber);
    margin-bottom: 28px;
  }
  .ep-body {
    font-size: 0.9rem;
    line-height: 1.75;
    color: rgba(246, 246, 246, 0.75);
    font-weight: 300;
    max-width: 560px;
  }
  .ep-points {
    margin-top: 28px;
    display: flex; flex-direction: column; gap: 12px;
  }
  .ep-point {
    display: flex; align-items: flex-start; gap: 14px;
    padding: 16px 20px;
    border: 1px solid #3a1c63;
    background: #23133a;
    transition: border-color 0.2s;
  }
  .ep-point:hover { border-color: #5e309d; }
  .ep-dot {
    width: 6px; height: 6px;
    background: var(--amber);
    border-radius: 50%;
    margin-top: 7px; flex-shrink: 0;
  }
  .ep-point-text {
    font-size: 0.82rem;
    line-height: 1.6;
    color: rgba(248, 246, 243, 0.828);
  }

  /* ─── PROCESS TIMELINE ─── */
  #process {
    padding: 100px 48px;
  }
  .process-header { margin-bottom: 80px; }

  .timeline {
    position: relative;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
  }
  .timeline::before {
    content: '';
    position: absolute;
    top: 28px; left: 0; right: 0;
    height: 1px;
    background: linear-gradient(90deg, var(--amber), #68489585);
  }
  .tl-step {
    padding: 0 24px;
    padding-top: 64px;
    position: relative;
    cursor: none;
  }
  .tl-step::before {
    content: attr(data-num);
    position: absolute;
    top: 0; left: 24px;
    width: 56px; height: 56px;
    background: var(--ink);
    border: 1px solid #3a1c63;
    display: flex; align-items: center; justify-content: center;
    
    font-size: 1.6rem;
    color: var(--amber);
    transition: all 0.3s;
  }
  .tl-step:hover::before {
    background: var(--amber);
    color: var(--ink);
  }
  .tl-step-title {
    
    font-size: 1.3rem;
    margin-bottom: 12px;
  }
  .tl-step-body {
    font-size: 0.8rem;
    line-height: 1.7;
    color: var(--concrete);
    font-weight: 300;
  }

  /* ─── INSIGHTS MARQUEE ─── */
  #insights {
    padding: 60px 0;
    overflow: hidden;
    border-top: 1px solid #3a1c63;
    border-bottom: 1px solid #3a1c63;
    background: #1f1232;
  }
  .marquee-wrap { overflow: hidden; }
  .marquee-track {
    display: flex; gap: 48px;
    animation: marquee 28s linear infinite;
    width: max-content;
  }
  .marquee-item {
    display: flex; align-items: center; gap: 16px;
    
    font-size: 1.1rem;
    
    color: var(--concrete);
    white-space: nowrap;
  }
  .marquee-sep { color: var(--amber); font-size: 1.4rem; }

  /* ─── NEWSLETTER ─── */
  #newsletter {
    padding: 100px 48px;
    text-align: center;
    background: linear-gradient(135deg, #3a1c63 0%, #684895 100%);
  }
  .nl-label {
    
    font-size: 0.62rem;
    
    color: var(--amber);
    text-transform: uppercase;
    margin-bottom: 20px;
  }
  .nl-title {
    
    font-size: clamp(2.5rem, 5vw, 5rem);
    line-height: 1;
    margin-bottom: 16px;
  }
  .nl-sub {
    font-size: 0.9rem;
    color: var(--concrete);
    margin-bottom: 40px;
    font-weight: 300;
  }
  .nl-form {
    display: flex;
    gap: 0;
    max-width: 480px;
    margin: 0 auto;
  }
  .nl-input {
    flex: 1;
    padding: 16px 20px;
    background: #23133a;
    border: 1px solid #3a1c63;
    border-right: none;
    color: var(--paper);
    
    font-size: 0.85rem;
    outline: none;
    transition: border-color 0.2s;
  }
  .nl-input:focus { border-color: var(--amber); }
  .nl-input::placeholder { color: var(--concrete); }
  .nl-btn {
    padding: 16px 28px;
    background: var(--amber);
    color: var(--ink);
    
    font-size: 0.7rem;
    font-weight: 700;
    
    border: none; cursor: none;
    transition: background 0.2s;
  }
  .nl-btn:hover { background: #883cf0e0; }
  .nl-privacy {
    margin-top: 14px;
    
    font-size: 0.58rem;
    
    color: var(--concrete);
  }

  /* ─── FOOTER ─── */
  .ai-construction-hub footer {
    padding: 60px 48px 40px;
    border-top: 1px solid #3a1c63;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 40px;
    position: relative; z-index: 1;
  }
  .footer-brand .nav-logo { font-size: 1.8rem; }
  .footer-tagline {
    font-size: 0.8rem;
    color: var(--concrete);
    margin-top: 12px;
    line-height: 1.6;
    font-weight: 300;
  }
  .footer-col-title {
    
    font-size: 0.62rem;
    text-transform: uppercase;
    color: var(--amber);
    margin-bottom: 20px;
  }
  .footer-links { list-style: none; display: flex; flex-direction: column; gap: 10px; }
  .footer-links a {
    font-size: 0.82rem;
    color: var(--concrete);
    text-decoration: none;
    transition: color 0.2s;
  }
  .footer-links a:hover { color: var(--amber); }
  .footer-bottom {
    grid-column: 1 / -1;
    border-top: 1px solid #3a1c63;
    padding-top: 24px;
    display: flex; justify-content: space-between; align-items: center;
    
    font-size: 0.6rem;
    
    color: var(--concrete);
  }

  /* ─── ANIMATIONS ─── */
  @keyframes fadeUp {
    from { opacity: 0; transform: translateY(24px); }
    to   { opacity: 1; transform: translateY(0); }
  }
  @keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
  }
  @keyframes buildUp {
    from { height: 0 !important; }
  }
  @keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
  }
  @keyframes marquee {
    from { transform: translateX(0); }
    to   { transform: translateX(-50%); }
  }

  /* ─── SCROLL REVEAL ─── */
  .reveal {
    opacity: 0; transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
  }
  .reveal.in-view { opacity: 1; transform: translateY(0); }
  .reveal-delay-1 { transition-delay: 0.1s; }
  .reveal-delay-2 { transition-delay: 0.2s; }
  .reveal-delay-3 { transition-delay: 0.3s; }
  .reveal-delay-4 { transition-delay: 0.4s; }

  /* Ticker */
  .live-ticker {
    display: flex; align-items: center; gap: 12px;
    padding: 10px 48px;
    background: #23133a;
    border-bottom: 1px solid #3a1c63;
    position: relative; z-index: 1;
  }
  .ticker-label {
    
    font-size: 0.58rem;
    
    color: var(--amber);
    background: #1f1232;
    padding: 3px 8px;
    white-space: nowrap;
  }
  .ticker-text {
    
    font-size: 0.65rem;
    color: var(--concrete);
    overflow: hidden;
    white-space: nowrap;
  }
  .ticker-inner {
    animation: marquee 20s linear infinite;
    display: inline-block;
    width: max-content;
  }

  /* Responsive */
  @media (max-width: 900px) {
    #hero { grid-template-columns: 1fr; }
    .hero-visual { display: none; }
    .caps-grid { grid-template-columns: 1fr 1fr; }
    .timeline { grid-template-columns: 1fr 1fr; }
    .ai-construction-hub footer { grid-template-columns: 1fr 1fr; }
    .ai-construction-hub nav { padding: 16px 24px; }
    .ai-construction-hub nav .nav-links { display: none; }
    #hero, #capabilities, #process, #newsletter { padding-left: 24px; padding-right: 24px; }
    .explorer-layout { grid-template-columns: 1fr; }
    .explorer-tabs { flex-direction: row; overflow-x: auto; }
  }

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: #873cf015; }
::-webkit-scrollbar-thumb { background: #873cf015; border-radius: 3px; }