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

  :root {
    --bg-dark:      #0b0e1a;
    --bg-light:     #ebf2fa;
    --accent:       #5b5eff;
    --text-white:   #ebf2fa;
    --text-dark:    #2e3354;
    --text-hero-faded: rgba(55, 60, 90, 0.38);
  }

  html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
  }

  body {
    font-family: 'Space Grotesk', sans-serif;
    position: relative;
  }

  /* ─── Background transition layer ───────────────────── */
  .bg {
    position: fixed;
    inset: 0;
    background-color: var(--bg-dark);
    transition: background-color 0.9s cubic-bezier(0.77,0,0.18,1);
    z-index: 0;
  }

  body.menu-open .bg {
    background-color: var(--bg-light);
  }

  /* ─── Noise Overlay ──────────────────────────────────── */
  .noise {
    position: fixed;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.05'/%3E%3C/svg%3E");
    pointer-events: none;
    opacity: 0.4;
    z-index: 1;
  }

  /* ─── Lines Canvas ───────────────────────────────────── */
  .lines-canvas {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    z-index: 2;
    pointer-events: none;
  }

  /* ─── Grid Icon ──────────────────────────────────────── */
  .grid-icon {
    position: fixed;
    top: 24px;
    left: 28px;
    z-index: 20;
    opacity: 0;
    animation: fadeIn 0.5s ease 0.2s forwards;
  }

  .grid-icon .dot {
    fill: rgba(255,255,255,0.35);
    transition: fill 0.9s cubic-bezier(0.77,0,0.18,1);
  }

  body.menu-open .grid-icon .dot {
    fill: #2e3354;
  }

  /* ─── Arrow button ───────────────────────────────────── */
  .arrow-btn {
    position: fixed;
    bottom: 36px;
    right: 36px;
    z-index: 20;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    opacity: 0;
    animation: fadeIn 0.5s ease 0.9s forwards;
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), 0.3s ease;
  }

  .arrow-btn:hover {
    transform: scale(1.15);
  }

  .arrow-btn svg {
    display: block;
    transition: transform 0.6s cubic-bezier(0.77,0,0.18,1);
  }

  .arrow-btn .arrow-line,
  .arrow-btn .arrow-head {
    stroke: rgba(91, 94, 255, 0.85);
    transition: stroke 0.9s cubic-bezier(0.77,0,0.18,1);
  }

  body.menu-open .arrow-btn .arrow-line,
  body.menu-open .arrow-btn .arrow-head {
    stroke: #2e3354;
  }

  /* Flip arrow to point up on menu screen */
  body.menu-open .arrow-btn svg {
    transform: rotate(180deg);
  }

  /* ─── SCREEN 1: Hero ─────────────────────────────────── */
  .screen-hero {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.7s ease, transform 0.8s cubic-bezier(0.77,0,0.18,1);
  }

  body.menu-open .screen-hero {
    opacity: 0;
    transform: translateY(-40px);
    pointer-events: none;
  }

  .hero-content {
    text-align: left;
    padding: 0 2rem;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 0.9s cubic-bezier(0.22,1,0.36,1) 0.4s forwards;
  }

  .hero-content h1 {
    font-family: 'Poppins', sans-serif;
    font-style: italic;
    font-weight: 700;
    font-size: clamp(2.4rem, 6vw, 4.2rem);
    color: var(--text-white);
    line-height: 0.3;
    letter-spacing: -0.02em;
  }

  .hero-content .sub {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 400;
    font-size: clamp(2rem, 3vw, 3.5rem);
    color: var(--accent);
    letter-spacing: 0.01em;
    margin-top: 4px;
  }

  /* ─── SCREEN 2: Menu ─────────────────────────────────── */
  .screen-menu {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: start;
    z-index: 10;
    opacity: 0;
    transform: translateY(40px);
    pointer-events: none;
    transition: opacity 0.7s ease 0.15s, transform 0.8s cubic-bezier(0.77,0,0.18,1) 0.1s;
  }

  body.menu-open .screen-menu {
    opacity: 1;
    transform: translateY(0);
    pointer-events: all;
  }

  .menu-page {
    width: 100%;
    max-width: 860px;
    padding: 0 3rem;
  }

  /* ─── Nav List ───────────────────────────────────────── */
  .nav-list {
    list-style: none;
    display: flex;
    flex-direction: column;
  }

  .nav-list li {
    overflow: hidden;
  }

  .nav-list a {
    display: inline-block;
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 300;
    font-size: clamp(2.4rem, 6.5vw, 5rem);
    color: var(--text-dark);
    text-decoration: none;
    letter-spacing: 0.06em;
    line-height: 1.25;
    position: relative;
    transition: letter-spacing 0.35s ease, opacity 0.25s ease;

    transform: translateY(100%);
    opacity: 0;
    transition:
      transform 0.4s cubic-bezier(0.22,1,0.36,1),
      opacity   0.4s ease,
      letter-spacing 0.4s ease;
  }

  .nav-list a.is-visible {
    transform: translateY(0);
    opacity: 1;
  }

  .nav-list a:hover { letter-spacing: 0.12em; }
  .nav-list a:hover::after { width: 100%; }

  /* Dim siblings on hover */
  .nav-list:has(a:hover) a:not(:hover) { opacity: 0.25; }

  /* ─── Shared Animations ──────────────────────────────── */
  @keyframes fadeUp {
    to { opacity: 1; transform: translateY(0); }
  }

  @keyframes fadeIn {
    to { opacity: 1; }
  }

  @keyframes drawLine {
    to { stroke-dashoffset: 0; }
  }