/* ─── RESET & BASE ─────────────────────────────────────────── */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    :root {
      --bg:       #04050d;
      --surface:  #0a0d1e;
      --card:     #0e1228;
      --border:   #1c2550;
      --accent1:  #00e5ff;
      --accent2:  #c800ff;
      --accent3:  #ff6b00;
      --gold:     #ffd54f;
      --text:     #d8e3ff;
      --muted:    #6b7fa8;
    }
    html { scroll-behavior: smooth; }
    body {
      background: var(--bg);
      color: var(--text);
      font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
      line-height: 1.75;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    /* ─── ANIMATED BACKGROUND CANVAS ────────────────────────────── */
    #bgCanvas {
      position: fixed; inset: 0; z-index: 0;
      width: 100%; height: 100%;
      pointer-events: none;
    }

    /* ─── LAYOUT ────────────────────────────────────────────────── */
    .wrapper { position: relative; z-index: 1; max-width: 1100px; margin: 0 auto; padding: 0 24px; }

    /* ─── NAVBAR ────────────────────────────────────────────────── */
    nav {
      position: sticky; top: 0; z-index: 100;
      backdrop-filter: blur(18px) saturate(1.6);
      -webkit-backdrop-filter: blur(18px) saturate(1.6);
      background: rgba(4,5,13,0.78);
      border-bottom: 1px solid var(--border);
      padding: 14px 0;
    }
    nav .wrapper { display: flex; align-items: center; justify-content: space-between; }
    .nav-logo {
      font-size: 1.35rem; font-weight: 700; letter-spacing: .05em;
      background: linear-gradient(90deg, var(--accent1), var(--accent2));
      -webkit-background-clip: text; -webkit-text-fill-color: transparent;
      filter: drop-shadow(0 0 8px rgba(0,229,255,.3));
    }
    nav ul { list-style: none; display: flex; gap: 28px; flex-wrap: wrap; }
    nav a {
      color: var(--muted); text-decoration: none; font-size: .9rem;
      transition: color .2s; position: relative;
    }
    nav a::after {
      content:''; position:absolute; left:0; bottom:-4px;
      width:0; height:2px;
      background: linear-gradient(90deg, var(--accent1), var(--accent2));
      transition: width .3s ease;
    }
    nav a:hover { color: var(--accent1); }
    nav a:hover::after { width: 100%; }

    /* ─── HERO ──────────────────────────────────────────────────── */
    .hero {
      min-height: 90vh;
      display: flex; flex-direction: column;
      align-items: center; justify-content: center;
      text-align: center;
      padding: 60px 24px 40px;
    }
    .hero-tag {
      display: inline-block;
      border: 1px solid var(--accent1);
      color: var(--accent1);
      font-size: .78rem; letter-spacing: .14em; text-transform: uppercase;
      padding: 5px 16px; border-radius: 99px; margin-bottom: 28px;
      animation: pulse-border 2.4s infinite;
    }
    @keyframes pulse-border {
      0%,100% { box-shadow: 0 0 0 0 rgba(0,229,255,.4); }
      50%      { box-shadow: 0 0 0 8px rgba(0,229,255,0); }
    }
    .hero h1 {
      font-size: clamp(2.8rem, 8vw, 5.5rem);
      font-weight: 800; line-height: 1.05;
      background: linear-gradient(135deg, #fff 0%, var(--accent1) 35%, var(--accent2) 70%, var(--accent3) 100%);
      -webkit-background-clip: text; -webkit-text-fill-color: transparent;
      margin-bottom: 24px;
      filter: drop-shadow(0 0 30px rgba(0,229,255,.3));
      animation: title-glow 4s ease-in-out infinite alternate;
    }
    @keyframes title-glow {
      from { filter: drop-shadow(0 0 14px rgba(0,229,255,.15)); }
      to   { filter: drop-shadow(0 0 28px rgba(200,0,255,.2)); }
    }
    .hero p {
      max-width: 660px; font-size: 1.12rem; color: var(--muted); margin-bottom: 40px;
    }
    .btn-row { display: flex; gap: 16px; flex-wrap: wrap; justify-content: center; }
    .btn {
      display: inline-flex; align-items: center; gap: 8px;
      padding: 13px 30px; border-radius: 8px; font-size: .95rem; font-weight: 600;
      text-decoration: none; transition: transform .2s, box-shadow .2s;
      cursor: pointer; border: none;
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--accent1), var(--accent2));
      color: #04050d;
    }
    .btn-secondary {
      border: 1px solid var(--border); color: var(--text);
      background: rgba(255,255,255,.04);
    }
    .btn:hover { transform: translateY(-2px); box-shadow: 0 8px 32px rgba(0,229,255,.25); }

    /* ─── HAIR DIAGRAM ──────────────────────────────────────────── */
    .hair-canvas-wrap {
      margin-top: 36px;
      width: min(600px, 100%);
      position: relative;
    }
    canvas#hairDiagram {
      width: 100%; height: auto;
      border-radius: 16px;
      border: 1px solid var(--border);
      box-shadow: 0 0 80px rgba(0,229,255,.10);
    }

    /* ─── SCROLL-REVEAL ─────────────────────────────────────────── */
    .reveal {
      opacity: 0; transform: translateY(36px);
      transition: opacity .7s cubic-bezier(.22,1,.36,1), transform .7s cubic-bezier(.22,1,.36,1);
    }
    .reveal.visible { opacity: 1; transform: translateY(0); }

    /* ─── SECTION TITLES ────────────────────────────────────────── */
    section { padding: 100px 0; position: relative; }
    section::after {
      content: ''; display: block;
      position: absolute; bottom: 0; left: 10%; right: 10%;
      height: 1px;
      background: linear-gradient(90deg, transparent, var(--accent1), var(--accent2), var(--accent1), transparent);
      opacity: 0.2;
    }
    section:last-of-type::after { display: none; }
    .section-label {
      font-size: .78rem; letter-spacing: .16em; text-transform: uppercase;
      color: var(--accent1); margin-bottom: 12px;
    }
    .section-title {
      font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: 700;
      margin-bottom: 20px; line-height: 1.2;
    }
    .section-subtitle { color: var(--muted); max-width: 620px; margin-bottom: 60px; }

    /* ─── EQUATION HIGHLIGHT ────────────────────────────────────── */
    .eq {
      display: inline-block; padding: 2px 10px;
      background: rgba(0,229,255,.07);
      border: 1px solid rgba(0,229,255,.18);
      border-radius: 6px;
      font-family: 'Cambria Math', 'Times New Roman', serif;
      font-style: italic; color: var(--accent1);
      font-size: .92em; white-space: nowrap;
    }

    /* ─── CARDS GRID ────────────────────────────────────────────── */
    .grid { display: grid; gap: 24px; }
    .grid-2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
    .grid-3 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
    .card {
      background: var(--card);
      border: 1px solid var(--border);
      border-radius: 16px;
      padding: 24px 28px;
      transition: transform .3s, border-color .3s, box-shadow .3s;
      position: relative;
      overflow: hidden;
    }
    .card::before {
      content: ''; position: absolute; top: 0; left: 0; right: 0;
      height: 2px;
      background: linear-gradient(90deg, var(--accent1), var(--accent2), var(--accent3));
      opacity: 0;
      transition: opacity .3s;
    }
    .card:hover::before { opacity: 1; }
    .card:hover {
      transform: translateY(-6px);
      border-color: rgba(0,229,255,.25);
      box-shadow: 0 6px 24px rgba(0,229,255,.08), 0 0 40px rgba(0,229,255,.04),
                  inset 0 1px 0 rgba(0,229,255,.06);
    }
    .card-icon {
      font-size: 2.2rem; margin-bottom: 10px;
      display: inline-flex; align-items: center; justify-content: center;
      width: 48px; height: 48px;
      background: linear-gradient(135deg, rgba(0,229,255,.06), rgba(200,0,255,.05));
      border: 1px solid rgba(0,229,255,.1);
      border-radius: 12px;
      box-shadow: 0 0 8px rgba(0,229,255,.05);
    }
    .card h3 { font-size: 1.15rem; margin-bottom: 6px; }
    .card p  { color: var(--muted); font-size: .93rem; }

    /* ─── STRUCTURE DIAGRAM ─────────────────────────────────────── */
    .structure-diagram {
      display: flex; flex-direction: column; gap: 0;
      align-items: center; margin: 28px auto; max-width: 520px;
    }
    .layer {
      width: 100%; padding: 14px 28px;
      display: flex; align-items: center; gap: 18px;
      font-size: .92rem; font-weight: 500;
      border: 1px solid transparent;
      transition: background .2s, transform .2s, box-shadow .2s;
      position: relative;
    }
    .layer:hover {
      background: rgba(255,255,255,.03); transform: translateX(6px);
      box-shadow: -4px 0 12px rgba(0,229,255,.1);
    }
    .layer:first-child { border-radius: 14px 14px 0 0; }
    .layer:last-child  { border-radius: 0 0 14px 14px; }
    .layer-dot {
      flex-shrink: 0; width: 18px; height: 18px; border-radius: 50%;
    }
    .layer-spec { color: var(--muted); font-size: .82rem; margin-left: auto; }

    /* ─── ENERGY FLOW ───────────────────────────────────────────── */
    .energy-flow {
      display: flex; align-items: flex-start; gap: 0;
      justify-content: center; flex-wrap: wrap;
      margin: 28px 0;
    }
    .e-step {
      text-align: center; padding: 16px 16px;
      flex: 1; min-width: 160px; max-width: 200px;
    }
    .e-icon { font-size: 2.4rem; margin-bottom: 10px; }
    .e-step h4 { font-size: .95rem; margin-bottom: 6px; }
    .e-step p { color: var(--muted); font-size: .82rem; }
    .e-arrow {
      font-size: 1.4rem; color: var(--accent1);
      align-self: center; padding: 0 4px; flex-shrink: 0;
    }

    /* ─── RGB COLOR DEMO ────────────────────────────────────────── */
    .rgb-demo {
      display: flex; gap: 16px; flex-wrap: wrap;
      justify-content: center; margin: 28px 0;
    }
    .rgb-swatch {
      width: 100px; height: 140px;
      border-radius: 12px; display: flex; flex-direction: column;
      align-items: center; justify-content: flex-end;
      padding-bottom: 14px; font-size: .82rem; font-weight: 600;
      cursor: pointer; transition: transform .2s;
      border: 1px solid rgba(255,255,255,.1);
      position: relative; overflow: hidden;
    }
    .rgb-swatch:hover { transform: scale(1.06); }
    .rgb-swatch::before {
      content: ''; position: absolute; inset: 0;
      background: inherit; opacity: 1;
      animation: glow-pulse 1.8s infinite alternate;
    }
    @keyframes glow-pulse {
      from { filter: brightness(1);   }
      to   { filter: brightness(1.4); }
    }
    .swatch-label { position: relative; z-index: 1; color: rgba(255,255,255,.85); }

    /* ─── RGB INTERACTIVE PICKER ────────────────────────────────── */
    .rgb-picker-wrap {
      margin: 28px auto; max-width: 480px; padding: 24px;
      background: var(--card); border:1px solid var(--border);
      border-radius: 16px; text-align: center;
    }
    .rgb-picker-wrap h3 { margin-bottom: 20px; font-size: 1.1rem; }
    .rgb-sliders { display: flex; flex-direction: column; gap: 14px; margin-bottom: 24px; }
    .rgb-sliders label {
      display: flex; align-items: center; gap: 12px; font-size: .88rem; font-weight: 600;
    }
    .rgb-sliders label span { width: 18px; text-align: center; }
    .rgb-sliders input[type=range] { flex: 1; accent-color: var(--accent1); height: 6px; }
    .rgb-sliders .val { width: 36px; text-align: right; font-family: monospace; color: var(--muted); }
    .strand-preview {
      width: 6px; height: 180px; margin: 0 auto; border-radius: 3px;
      box-shadow: 0 0 24px var(--glow, rgba(0,229,255,.6));
      transition: background .15s, box-shadow .15s;
      position: relative;
    }
    .strand-preview::before {
      content: ''; position: absolute; inset: -8px;
      border-radius: 6px;
      background: inherit; filter: blur(12px);
      opacity: 0.3;
    }
    .strand-preview::after {
      content: ''; position: absolute; bottom: -12px; left: 50%; transform: translateX(-50%);
      width: 24px; height: 24px; border-radius: 50%;
      background: inherit; filter: brightness(1.3);
      box-shadow: 0 0 24px var(--glow, rgba(0,229,255,.6));
    }
    .strand-color-label {
      margin-top: 22px; font-family: monospace; font-size: .85rem; color: var(--muted);
    }

    /* ─── ANTENNA SECTION ───────────────────────────────────────── */
    .antenna-specs {
      display: flex; flex-wrap: wrap; gap: 14px; margin-top: 24px;
    }
    .spec-chip {
      background: rgba(200,0,255,.06);
      border: 1px solid rgba(200,0,255,.2);
      border-radius: 10px; padding: 14px 20px;
      flex: 1; min-width: 180px;
      transition: border-color .3s, box-shadow .3s;
    }
    .spec-chip:hover {
      border-color: rgba(200,0,255,.5);
      box-shadow: 0 0 20px rgba(200,0,255,.12);
    }
    .spec-chip .label { font-size: .75rem; color: var(--accent2); letter-spacing: .1em; text-transform: uppercase; margin-bottom: 4px; }
    .spec-chip .value { font-size: 1.1rem; font-weight: 600; }

    /* ─── GRAFT TIMELINE ────────────────────────────────────────── */
    .timeline { position: relative; padding-left: 44px; margin-top: 28px; }
    .timeline::before {
      content: ''; position: absolute; left: 14px; top: 0; bottom: 0;
      width: 2px; background: linear-gradient(to bottom, var(--accent1), var(--accent2));
      border-radius: 2px;
    }
    .t-item {
      position: relative; margin-bottom: 28px;
      opacity: 0; transform: translateX(-20px);
      transition: opacity .5s ease, transform .5s ease;
    }
    .t-item.visible { opacity: 1; transform: translateX(0); }
    .t-dot {
      position: absolute; left: -37px; top: 4px;
      width: 16px; height: 16px; border-radius: 50%;
      border: 2px solid var(--accent1);
      background: var(--bg);
      box-shadow: 0 0 8px rgba(0,229,255,.35);
      animation: dot-pulse 2s infinite;
    }
    @keyframes dot-pulse {
      0%, 100% { box-shadow: 0 0 6px rgba(0,229,255,.3); }
      50%      { box-shadow: 0 0 12px rgba(0,229,255,.5); }
    }
    .t-item h4 { font-size: 1rem; font-weight: 700; margin-bottom: 6px; }
    .t-item p  { color: var(--muted); font-size: .92rem; }
    .t-badge {
      display: inline-block; font-size: .72rem; padding: 3px 10px;
      border-radius: 99px; margin-bottom: 8px; font-weight: 600; letter-spacing: .06em;
    }

    /* ─── TECH SPECS TABLE ──────────────────────────────────────── */
    .specs-table {
      width: 100%; border-collapse: collapse;
      font-size: .92rem; margin-top: 24px;
    }
    .specs-table th {
      text-align: left; padding: 12px 16px;
      background: rgba(0,229,255,.07);
      color: var(--accent1); font-size: .8rem; letter-spacing: .1em; text-transform: uppercase;
    }
    .specs-table td {
      padding: 13px 16px;
      border-bottom: 1px solid var(--border);
      color: var(--muted);
    }
    .specs-table td:first-child { color: var(--text); font-weight: 500; }
    .specs-table tr:hover td { background: rgba(0,229,255,.03); }
    .specs-table tr:hover td:first-child { color: var(--accent1); }

    /* ─── FOOTER ────────────────────────────────────────────────── */
    footer {
      border-top: 1px solid var(--border);
      padding: 40px 0;
      text-align: center;
      color: var(--muted);
      font-size: .87rem;
      position: relative;
    }
    footer::before {
      content: ''; position: absolute; top: -1px; left: 20%; right: 20%;
      height: 1px;
      background: linear-gradient(90deg, transparent, var(--accent1), var(--accent2), transparent);
    }
    footer span { color: var(--accent1); }

    /* ─── RESPONSIVE ────────────────────────────────────────────── */
    /* Burger menu button */
    .burger {
      display: none; background: none; border: none; cursor: pointer;
      flex-direction: column; gap: 5px; padding: 6px;
    }
    .burger span {
      display: block; width: 24px; height: 2px;
      background: var(--text); border-radius: 2px;
      transition: transform .3s, opacity .3s;
    }
    .burger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    .burger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
    .burger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

    @media (max-width: 900px) {
      .burger { display: flex; }
      #navMenu {
        display: none; flex-direction: column;
        position: absolute; top: 100%; left: 0; right: 0;
        background: rgba(4,5,13,.95); backdrop-filter: blur(14px);
        padding: 16px 24px; gap: 12px;
        border-bottom: 1px solid var(--border);
      }
      #navMenu.open { display: flex; }
    }

    @media (max-width: 640px) {
      nav a { font-size: .78rem; }
      .energy-flow { flex-direction: column; align-items: center; }
      .e-arrow { transform: rotate(90deg); }
      .antenna-specs { flex-direction: column; }
      .timeline::before { width: 1px; }
      .t-dot { width: 12px; height: 12px; left: -34px; }
    }

    /* ─── BACK TO TOP ───────────────────────────────────────────── */
    .back-to-top {
      position: fixed; bottom: 28px; right: 28px; z-index: 99;
      width: 40px; height: 40px; border-radius: 50%;
      background: var(--card); border: 1px solid var(--border);
      color: var(--accent1); font-size: 1.2rem;
      display: flex; align-items: center; justify-content: center;
      cursor: pointer; opacity: 0; pointer-events: none;
      transition: opacity .3s, transform .3s;
      box-shadow: 0 2px 12px rgba(0,0,0,.3);
    }
    .back-to-top.visible { opacity: 1; pointer-events: auto; }
    .back-to-top:hover { transform: translateY(-3px); border-color: var(--accent1); }

.reveal,.t-item{opacity:1!important;transform:none!important;}#bgCanvas{display:none;}