:root {
    --bg: #0a0c10;
    --surface: #12151c;
    --surface2: #1a1f2b;
    --border: rgba(255,255,255,0.07);
    --accent: #f0a500;
    --accent2: #00d4aa;
    --accent3: #e05a5a;
    --text: #e8eaf0;
    --muted: #6b7280;
    --panel: #060e1a;
    --flash: #00e5ff;
    --amber: #ffb300;
    --green: #00ff88;
    --dim: #0a1f30;
    --glow-flash: 0 0 8px #00e5ff88, 0 0 20px #00e5ff44;
    --card-glow: rgba(240,165,0,0.08);
  }
     * { margin:0; padding:0; box-sizing:border-box; }
  html { scroll-behavior: smooth; }
  body { background: var(--bg); color: var(--text); font-family: 'DM Mono', monospace; min-height: 100vh; overflow-x: hidden; }
  body::before { content:''; 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='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.03'/%3E%3C/svg%3E");
                pointer-events:none; z-index:0; opacity:.4;}

                /* Preloader Section */
                
  /* ── Flash burst ── */
  #flash {
    position: fixed; inset: 0;
    background: var(--flash);
    z-index: 99999;
    opacity: 0; pointer-events: none;
    transition: opacity 0.1s ease;
  }
  #flash.on { opacity: 0.15; }

  /* ── Preloader shell ── */
  #preloader {
    position: fixed; inset: 0; z-index: 500;
    display: flex; align-items: center; justify-content: center;
    background: linear-gradient(rgba(0,0,0,0.8), rgba(0,0,0,0.8)), url(images/microchips.jpg);
    background-size: cover;
    background-position: center;
    transition: opacity 0.8s ease, transform 0.8s ease;
  }
  #preloader.hide {
    opacity: 0; transform: scale(1.05); pointer-events: none;
  }
  #preloader::before {
    content: '';
    position: absolute; inset: 0;
    background: repeating-linear-gradient(to bottom,
      transparent 0px, transparent 3px,
      rgba(0,0,0,0.18) 3px, rgba(0,0,0,0.18) 4px);
    pointer-events: none; z-index: 1;
  }
  #preloader::after {
    content: '';
    position: absolute; inset: 0;
    background-image:
      linear-gradient(rgba(0,229,255,0.04) 1px, transparent 1px),
      linear-gradient(90deg, rgba(0,229,255,0.04) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none; z-index: 0;
  }

  /* ── Particles ── */
  .particles { position: absolute; inset: 0; overflow: hidden; z-index: 1; pointer-events: none; }
  .particle {
    position: absolute; width: 2px; height: 2px; border-radius: 50%; opacity: 0;
    animation: float var(--dur) var(--delay) infinite ease-in-out;
  }
  @keyframes float {
    0%   { transform: translate(0, 100vh) scale(0); opacity: 0; }
    10%  { opacity: 0.6; }
    90%  { opacity: 0.3; }
    100% { transform: translate(var(--dx), -20px) scale(1.5); opacity: 0; }
  }

  /* ── Loader wrapper ── */
  .loader-wrapper {
    position: relative; z-index: 10;
    display: flex; flex-direction: column; align-items: center;
    gap: 36px; width: min(520px, 92vw);
  }

  /* ── Header ── */
  .header { text-align: center; width: 100%; }
  .header .label {
    font-size: 0.65rem; letter-spacing: 0.35em; color: var(--flash);
    opacity: 0.7; text-transform: uppercase;
    animation: fadein 0.6s ease forwards;
  }
  .header h1 {
    font-family: 'Orbitron', sans-serif;
    font-size: clamp(1.4rem, 5vw, 2rem); font-weight: 900;
    color: #fff; letter-spacing: 0.08em; margin-top: 6px;
    text-shadow: var(--glow-flash);
    animation: fadein 0.8s 0.1s ease both;
  }
  .header h1 span { color: var(--flash); }
  .header .sub {
    font-size: 0.7rem; color: var(--amber); letter-spacing: 0.22em;
    margin-top: 4px; opacity: 0.8;
    animation: fadein 0.8s 0.2s ease both;
  }

  /* ── Circuit ring ── */
  .circuit-ring {
    position: relative; width: 180px; height: 180px;
    animation: fadein 0.6s 0.3s ease both;
  }
  .circuit-ring svg { width: 100%; height: 100%; }
  .ring-outer { animation: spin 8s linear infinite; transform-origin: center; }
  .ring-inner { animation: spin-rev 5s linear infinite; transform-origin: center; }
  .core-group { animation: pulse-core 2s ease-in-out infinite; transform-origin: center; }
  @keyframes spin     { to { transform: rotate(360deg); } }
  @keyframes spin-rev { to { transform: rotate(-360deg); } }
  @keyframes pulse-core {
    0%,100% { opacity:1; transform:scale(1); }
    50%     { opacity:0.6; transform:scale(0.9); }
  }
  .orbit-dash { stroke-dasharray: 6 10; animation: orbit-anim 3s linear infinite; }
  @keyframes orbit-anim { to { stroke-dashoffset: -64; } }
  .tracer { animation: trace-orbit 3s linear infinite; transform-origin: 90px 90px; }
  @keyframes trace-orbit { to { transform: rotate(360deg); } }

  /* ── Readout ── */
  .readout {
    display: flex; justify-content: space-between;
    width: 100%; gap: 8px;
    animation: fadein 0.6s 0.45s ease both;
  }
  .seg {
    flex: 1; background: var(--panel);
    border: 1px solid rgba(0,229,255,0.1); border-radius: 4px;
    padding: 8px 10px; text-align: center;
  }
  .seg .seg-label {
    font-size: 0.55rem; letter-spacing: 0.2em; color: var(--amber);
    opacity: 0.7; display: block; margin-bottom: 4px;
  }
  .seg .seg-val {
    font-family: 'Orbitron', sans-serif; font-size: 0.85rem;
    color: var(--flash); text-shadow: var(--glow-flash);
  }

  /* ── Progress ── */
  .progress-wrap { width: 100%; animation: fadein 0.6s 0.4s ease both; }
  .progress-meta {
    display: flex; justify-content: space-between;
    font-size: 0.62rem; color: var(--text); opacity: 0.6;
    margin-bottom: 6px; letter-spacing: 0.12em;
  }
  .progress-track {
    width: 100%; height: 6px; background: var(--dim);
    border-radius: 3px; overflow: hidden; position: relative;
  }
  .progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--flash), var(--green));
    border-radius: 3px; box-shadow: var(--glow-flash);
    width: 0%; transition: width 0.55s cubic-bezier(.4,0,.2,1);
    position: relative; overflow: hidden;
  }
  .progress-bar::after {
    content: ''; position: absolute; top: 0; left: -60px;
    width: 60px; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    animation: shimmer 1.6s ease-in-out infinite;
  }
  @keyframes shimmer { to { left: 100%; } }

  /* ── Terminal ── */
  .terminal {
    width: 100%; background: var(--panel);
    border: 1px solid rgba(0,229,255,0.18); border-radius: 6px;
    padding: 16px 18px; position: relative;
    animation: fadein 0.6s 0.5s ease both;
    box-shadow: 0 0 30px rgba(0,229,255,0.06), inset 0 0 20px rgba(0,0,0,0.4);
  }
  .terminal::before {
    content: 'BOOT SEQUENCE'; position: absolute; top: -9px; left: 16px;
    background: var(--panel); padding: 0 8px;
    font-size: 0.6rem; letter-spacing: 0.3em; color: var(--flash); opacity: 0.7;
  }
  .term-line {
    display: flex; align-items: center; gap: 8px;
    font-size: 0.7rem; line-height: 1.8; color: #5a8aa0;
    opacity: 0; animation: term-appear 0.3s ease forwards;
  }
  .term-line.done   { color: var(--green); }
  .term-line.active { color: var(--flash); }
  .term-line .ic    { font-size: 0.65rem; min-width: 14px; }
  .term-line:nth-child(1) { animation-delay: 0.6s; }
  .term-line:nth-child(2) { animation-delay: 1.1s; }
  .term-line:nth-child(3) { animation-delay: 1.6s; }
  .term-line:nth-child(4) { animation-delay: 2.1s; }
  .term-line:nth-child(5) { animation-delay: 2.6s; }
  .term-line:nth-child(6) { animation-delay: 3.2s; }
  @keyframes term-appear {
    from { opacity:0; transform:translateX(-6px); }
    to   { opacity:1; transform:translateX(0); }
  }
  .cursor {
    display: inline-block; width: 7px; height: 0.75em;
    background: var(--flash); margin-left: 4px; vertical-align: middle;
    animation: blink 0.9s step-end infinite;
  }
  @keyframes blink { 0%,100%{opacity:1;} 50%{opacity:0;} }

  /* ── Status row ── */
  .status-row {
    display: flex; align-items: center; gap: 8px;
    font-size: 0.65rem; letter-spacing: 0.2em;
    color: var(--text); opacity: 0.7;
    animation: fadein 0.6s 0.55s ease both;
    transition: color 0.4s, opacity 0.4s;
  }
  .status-row.ready { color: var(--green); opacity: 1; }
  .dot {
    width: 8px; height: 8px; border-radius: 50%;
    background: var(--green); box-shadow: 0 0 8px var(--green);
    animation: dot-pulse 1.4s ease-in-out infinite;
  }
  .dot.go {
    background: var(--flash); box-shadow: 0 0 14px var(--flash);
    animation: dot-burst 0.5s ease forwards;
  }
  @keyframes dot-pulse {
    0%,100%{opacity:1;transform:scale(1);}
    50%{opacity:0.4;transform:scale(0.7);}
  }
  @keyframes dot-burst {
    0%{transform:scale(1);}
    50%{transform:scale(2.4);}
    100%{transform:scale(1);}
  }

  @keyframes fadein {
    from { opacity:0; transform:translateY(8px); }
    to   { opacity:1; transform:translateY(0); }
  }

  /* ── NAV SECTION ── */
  nav { position: fixed; top:0; left:0; right:0; z-index:100; background: rgba(10,12,16,0.85); backdrop-filter: blur(16px); border-bottom: 1px solid var(--border); padding: 0 2rem;
    height: 64px;
    display: flex; align-items: center; justify-content: space-between;
  }
  .nav-logo { font-family: 'Syne', sans-serif; font-weight: 800; font-size: 1.4rem; color: var(--accent); letter-spacing: -0.02em; cursor: pointer;}
  .nav-logo span { color: var(--text); }
  .nav-links { display:flex; gap:2rem; align-items: center;}
  .nav-links a {
    color: var(--muted); text-decoration:none; font-size:0.78rem;
    letter-spacing:0.08em; text-transform:uppercase;
    transition: color 0.2s; }
  .nav-links a:hover { color: var(--accent); }
  .nav-search {
    display:flex; align-items: center; gap: 0.5rem;
    background: var(--surface); border: 1px solid var(--border);
    border-radius: 8px; padding: 0.4rem 0.8rem;
    transition: border-color 0.2s;
  }
  .nav-search:focus-within { border-color: var(--accent); }
  .nav-search input {
    background: none; border: none; outline: none;
    color: var(--text); font-family: 'DM Mono', monospace;
    font-size: 0.8rem; width: 180px;
  }
  .nav-search input::placeholder { color: var(--muted); }
  .search-icon { color: var(--muted); font-size:0.9rem; }

  /* ── PAGES SECTION ── */
  .page { display:none; min-height:100vh; padding-top:64px; }
  .page.active { display:block; }

  /* ── HERO SECTION── */
  .hero {
    background: linear-gradient(rgba(0,0,0,0.6), rgba(0,0,0,0.6)), url(images/bg.png);
    background-size: cover;
    background-position: center;
    position: relative;
    padding: 6rem 2rem 4rem;
    max-width: 1200px;
    margin: 0 auto;
    overflow: hidden;
  }
  .hero-grid-bg {
    position:absolute; inset:0;
    background-image:
      linear-gradient(rgba(240,165,0,0.04) 1px, transparent 1px),
      linear-gradient(90deg, rgba(240,165,0,0.04) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events:none;
  }
  .hero-badge {
    display:inline-flex; align-items:center; gap:0.5rem;
    background: rgba(240,165,0,0.1); border:1px solid rgba(240,165,0,0.3);
    border-radius:100px; padding:0.3rem 1rem;
    font-size:0.72rem; color:var(--accent); letter-spacing:0.1em;
    text-transform:uppercase; margin-bottom:1.5rem;
  }
  .hero-badge::before { content:'⚡'; }
  .hero h1 {
    font-family: 'Syne', sans-serif;
    font-weight:800; font-size:clamp(2.5rem,6vw,5rem);
    line-height:1.05; letter-spacing:-0.03em;
    margin-bottom:1.5rem;
  }
  .hero h1 em { font-style: normal; color: var(--accent); }
  .hero p {
    font-size: 1.3rem; color:var(--text); max-width: 600px;
    line-height: 1.8; margin-bottom: 2.5rem;
  }
  .hero-actions { display:flex; gap:1rem; flex-wrap:wrap; }
  .btn-primary {
    background: var(--accent); color:#000;
    padding:0.75rem 1.75rem; border-radius:8px;
    font-family:'Syne',sans-serif; font-weight:700;
    font-size:0.85rem; letter-spacing:0.05em;
    border:none; cursor:pointer; transition:all 0.2s;
    text-transform:uppercase;
  }
  .btn-primary:hover { background:#ffc234; transform:translateY(-2px); }
  .btn-secondary {
    background:transparent; color:var(--text);
    padding:0.75rem 1.75rem; border-radius:8px;
    font-family:'Syne',sans-serif; font-weight:600;
    font-size:0.85rem; letter-spacing:0.05em;
    border:1px solid var(--border); cursor:pointer;
    transition:all 0.2s; text-transform:uppercase;
  }
  .btn-secondary:hover { border-color:var(--accent); color:var(--accent); }
  .btn-secondary a {color: var(--accent); font-family:'Syne',sans-serif; font-weight:600;  cursor:pointer; text-decoration: none; }

  /* ── STATS SECTION ── */
  .stats-bar {
    display:flex; gap:0; border:1px solid var(--border);
    border-radius:12px; overflow:hidden; margin:4rem auto;
    max-width:900px;
  }
  .stat {
    flex:1; padding:1.5rem;
    border-right:1px solid var(--border);
    text-align:center;
    background:var(--surface);
    transition: background 0.2s;
  }
  .stat:last-child { border-right:none; }
  .stat:hover { background: var(--surface2); }
  .stat-num {
    font-family:'Syne',sans-serif; font-size:2rem;
    font-weight:800; color:var(--accent);
  }
  .stat-label { font-size:0.72rem; color:var(--muted); margin-top:0.3rem; letter-spacing:0.08em; text-transform:uppercase; }

  /* ── FILTERS SECTION ── */
  .section-header {
    max-width:1200px; margin:0 auto 2rem;
    padding:0 2rem;
    display:flex; align-items:center; justify-content:space-between; flex-wrap:wrap; gap:1rem;
  }
  .section-title {
    font-family:'Syne',sans-serif; font-weight:700; font-size:1.4rem; letter-spacing:-0.02em;
  }
  .section-title span { color:var(--accent); }
  .filter-pills { display:flex; gap:0.5rem; flex-wrap:wrap; }
  .pill {
    padding:0.4rem 1rem; border-radius:100px;
    border:1px solid var(--border);
    background:transparent; color:var(--muted);
    font-family:'DM Mono',monospace; font-size:0.72rem;
    cursor:pointer; transition:all 0.2s;
    letter-spacing:0.05em;
  }
  .pill:hover, .pill.active {
    background:var(--accent); color:#000;
    border-color:var(--accent); font-weight:500;
  }

  /* ── COMPONENT GRID SECTION ── */
  .components-grid {
    display:grid;
    grid-template-columns: repeat(auto-fill, minmax(280px,1fr));
    gap:1.5rem;
    max-width:1200px; margin:0 auto;
    padding:0 2rem 4rem;
  }
  .component-card {
    background:var(--surface);
    border:1px solid var(--border);
    border-radius:16px; overflow:hidden;
    cursor:pointer; transition:all 0.3s;
    position:relative;
  }
  .component-card::before {
    content:'';
    position:absolute; inset:0;
    background: radial-gradient(circle at 50% 0%, var(--card-glow), transparent 70%);
    opacity:0; transition: opacity 0.3s;
    pointer-events:none; border-radius:16px;
  }
  .component-card:hover {
    border-color: rgba(240,165,0,0.4);
    transform:translateY(-4px);
    box-shadow:0 20px 40px rgba(0,0,0,0.4);
  }
  .component-card:hover::before { opacity:1; }

  .card-image {
    height:180px; background:var(--surface2);
    display:flex; align-items:center; justify-content:center;
    position:relative; overflow:hidden;
  }
  .card-image svg { width:120px; height:120px; }
  .card-category-badge {
    position:absolute; top:12px; left:12px;
    padding:0.25rem 0.6rem; border-radius:6px;
    font-size:0.65rem; font-weight:500; letter-spacing:0.08em;
    text-transform:uppercase;
  }
  .badge-passive { background:rgba(0,212,170,0.15);  color:var(--accent2); border:1px solid rgba(0,212,170,0.3); }
  .badge-active  { background:rgba(240,165,0,0.15);  color:var(--accent);  border:1px solid rgba(240,165,0,0.3); }
  .badge-power   { background:rgba(224,90,90,0.15);  color:var(--accent3); border:1px solid rgba(224,90,90,0.3); }
  .badge-ic      { background:rgba(150,100,255,0.15);color:#a78bfa;      border:1px solid rgba(150,100,255,0.3); }
  .badge-sensor  { background:rgba(56,189,248,0.15); color:#38bdf8;      border:1px solid rgba(56,189,248,0.3); }

  .card-body { padding:1.25rem; }
  .card-name {font-family:'Syne',sans-serif; font-weight:700; font-size:1.1rem; margin-bottom:0.35rem;}
  .card-symbol { color:var(--accent); font-size:0.78rem; margin-bottom:0.5rem; }
  .card-desc {font-size:0.78rem; color:var(--muted); line-height:1.6; display:-webkit-box; --webkit-line-clamp:2; -webkit-box-orient:vertical; overflow:hidden;}
  .card-footer {
    padding:0.85rem 1.25rem;
    border-top:1px solid var(--border);
    display:flex; align-items:center; justify-content:space-between;
  }
  .card-tags { display:flex; gap:0.4rem; }
  .tag {
    padding:0.2rem 0.5rem; border-radius:4px;
    background:rgba(255,255,255,0.05);
    font-size:0.65rem; color:var(--muted);
  }
  .card-arrow {
    width:30px; height:30px; border-radius:50%;
    background:var(--surface2); border:1px solid var(--border);
    display:flex; align-items:center; justify-content:center;
    color:var(--muted); font-size:0.8rem;
    transition:all 0.2s;
  }
  .component-card:hover .card-arrow {
    background:var(--accent); border-color:var(--accent);
    color:#000;
  }

  /* ── DETAIL PAGE SECTION── */
  #detail-page { animation: fadeIn 0.3s ease; }
  @keyframes fadeIn { from { opacity:0; transform:translateY(12px); } to { opacity:1; transform:translateY(0); } }

  .detail-header {
    background: var(--surface);
    border-bottom:1px solid var(--border);
    padding:2rem;
  }
  .detail-header-inner { max-width:1200px; margin:0 auto; }
  .breadcrumb {
    display:flex; align-items:center; gap:0.5rem;
    font-size:0.75rem; color:var(--muted); margin-bottom:1.5rem;
  }
  .breadcrumb a { color:var(--accent); text-decoration:none; cursor:pointer; }
  .breadcrumb span { color:var(--border); }

  .detail-hero {
    display:grid; grid-template-columns:1fr 1fr; gap:3rem; align-items:start;
  }
  .detail-image-panel {
    background: var(--surface2); border: 1px solid var(--border);
    border-radius:16px; padding:2rem;
    display: flex; align-items:center; justify-content:center;
    min-height: 280px;
  }
  .detail-image-panel svg { width:200px; height:200px; }
  .detail-info h1 {
    font-family:'Syne',sans-serif; font-weight:800;
    font-size:2.2rem; letter-spacing:-0.03em; margin-bottom:0.5rem;
  }
  .detail-info .symbol-line {
    font-size:0.85rem; color:var(--accent); margin-bottom:1rem;
    font-family:'DM Mono',monospace;
  }
  .detail-info p { font-size:0.9rem; color:var(--muted); line-height:1.8; margin-bottom:1.5rem; }
  .spec-grid {
    display:grid; grid-template-columns:1fr 1fr; gap:0.75rem;
  }
  .spec-item {
    background:var(--bg); border:1px solid var(--border);
    border-radius:8px; padding:0.75rem;
  }
  .spec-label { font-size:0.65rem; color:var(--muted); text-transform:uppercase; letter-spacing:0.1em; margin-bottom:0.2rem; }
  .spec-value { font-size:0.85rem; color:var(--text); font-weight:500; }

  /* ── DETAIL TABS SECTION── */
  .detail-tabs-wrap { max-width:1200px; margin:2.5rem auto; padding:0 2rem; }
  .detail-tabs {
    display:flex; gap:0; border:1px solid var(--border);
    border-radius:12px; overflow:hidden;
    background:var(--surface); margin-bottom:2rem;
  }
  .dtab {
    flex:1; padding:0.9rem; text-align:center;
    font-size:0.78rem; letter-spacing:0.06em; text-transform:uppercase;
    cursor:pointer; border:none; background:none;
    color:var(--muted); font-family:'DM Mono',monospace;
    transition:all 0.2s;
    border-right:1px solid var(--border);
  }
  .dtab:last-child { border-right:none; }
  .dtab.active { background:var(--accent); color:#000; font-weight:600; }
  .dtab:hover:not(.active) { background:var(--surface2); color:var(--text); }

  .tab-content { display:none; animation: fadeIn 0.25s ease; }
  .tab-content.active { display:block; }

  /* ── OVERVIEW TAB SECTION ── */
  .pros-cons {
    display:grid; grid-template-columns:1fr 1fr; gap:1.5rem; margin-top:1.5rem;
  }
  .pros-box, .cons-box {
    border-radius:12px; padding:1.5rem;
    border:1px solid var(--border);
  }
  .pros-box { background:rgba(0,212,170,0.05); border-color:rgba(0,212,170,0.2); }
  .cons-box { background:rgba(224,90,90,0.05); border-color:rgba(224,90,90,0.2); }
  .pros-box h3 { color:var(--accent2); font-family:'Syne',sans-serif; margin-bottom:1rem; }
  .cons-box h3 { color:var(--accent3); font-family:'Syne',sans-serif; margin-bottom:1rem; }
  .pros-cons-list { list-style:none; }
  .pros-cons-list li {
    padding:0.4rem 0; font-size:0.82rem; color:var(--muted);
    border-bottom:1px solid var(--border); display:flex; gap:0.5rem; align-items:flex-start;
  }
  .pros-cons-list li:last-child { border-bottom:none; }
  .pros-cons-list li::before { font-size:0.7rem; flex-shrink:0; margin-top:2px; }
  .pros-box li::before { content:'✓'; color:var(--accent2); }
  .cons-box li::before { content:'✗'; color:var(--accent3); }

  .applications-grid {
    display:grid; grid-template-columns:repeat(auto-fill,minmax(160px,1fr));
    gap:0.75rem; margin-top:1rem;
  }
  .app-card {
    background:var(--surface); border:1px solid var(--border);
    border-radius:10px; padding:1rem; text-align:center;
    transition: border-color 0.2s;
  }
  .app-card:hover { border-color:var(--accent); }
  .app-card .app-icon { font-size:1.5rem; margin-bottom:0.5rem; }
  .app-card .app-name { font-size:0.75rem; color:var(--muted); }

  /* ── WIRING TAB SECTION── */
  .wiring-diagrams { display:flex; flex-direction:column; gap:2rem; }
  .wiring-card {
    background:var(--surface); border:1px solid var(--border);
    border-radius:16px; overflow:hidden;
  }
  .wiring-card-header {
    padding:1.25rem 1.5rem; border-bottom:1px solid var(--border);
    display:flex; align-items:center; justify-content:space-between;
  }
  .wiring-card-header h3 { font-family:'Syne',sans-serif; font-weight:700; }
  .wiring-difficulty {
    font-size:0.7rem; padding:0.2rem 0.6rem; border-radius:100px;
    letter-spacing:0.08em; text-transform:uppercase;
  }
  .diff-easy   { background:rgba(0,212,170,0.15); color:var(--accent2); }
  .diff-medium { background:rgba(240,165,0,0.15);  color:var(--accent); }
  .diff-hard   { background:rgba(224,90,90,0.15);  color:var(--accent3); }

  .wiring-body { padding:1.5rem; display:grid; grid-template-columns:1fr 1fr; gap:2rem; align-items:start; }
  .wiring-svg-wrap {
    background:var(--bg); border:1px solid var(--border);
    border-radius:12px; padding:1.5rem;
    display:flex; align-items:center; justify-content:center; min-height:200px;
  }
  .wiring-steps h4 { font-family:'Syne',sans-serif; margin-bottom:1rem; color:var(--accent); }
  .step-list { list-style:none; }
  .step-list li { display:flex; gap:0.75rem; align-items:flex-start;
    padding:0.6rem 0; border-bottom:1px solid var(--border);
    font-size:0.8rem; color:var(--muted); line-height:1.5;
  }
  .step-list li:last-child { border-bottom:none; }
  .step-num { width:22px; height:22px; border-radius:50%; background:var(--accent); color:#000; font-size:0.65rem; font-weight:700;
              display:flex; align-items:center; justify-content:center; flex-shrink:0; margin-top:1px; }

  /* ── FORMULA TAB SECTION── */
  .formula-section { margin-bottom:2rem; }
  .formula-section h3 { font-family:'Syne',sans-serif; margin-bottom:1rem; color:var(--accent); }
  .formula-box { background:var(--bg); border:1px solid var(--border); border-left:3px solid var(--accent); border-radius:0 8px 8px 0;
                 padding:1rem 1.5rem; font-family:'DM Mono',monospace; font-size:1.1rem; color:var(--text); letter-spacing:0.04em; margin-bottom:0.75rem;}
  .formula-desc { font-size:0.8rem; color:var(--muted); margin-top:0.3rem; }
  .var-table { width:100%; border-collapse:collapse; margin-top:1rem; }
  .var-table th { text-align:left; padding:0.6rem 1rem; font-size:0.7rem; color:var(--muted); text-transform:uppercase; letter-spacing:0.08em;
                  border-bottom:1px solid var(--border);}
  .var-table td { padding:0.6rem 1rem; font-size:0.8rem; border-bottom:1px solid var(--border); }
  .var-table td:first-child { color:var(--accent); font-family:'DM Mono',monospace; }
  .var-table tr:last-child td { border-bottom:none; }
  .var-table tr:hover td { background:var(--surface2); }

  /* ── QUIZ TAB SECTION── */
  .quiz-container { max-width:600px; }
  .quiz-question { font-family:'Syne',sans-serif; font-size:1.1rem; margin-bottom:1.5rem; line-height:1.5; }
  .quiz-options { display:flex; flex-direction:column; gap:0.75rem; margin-bottom:1.5rem; }
  .quiz-opt { padding:0.9rem 1.25rem; border-radius:10px; border:1px solid var(--border); background:var(--surface);
              cursor:pointer; font-size:0.85rem; transition:all 0.2s; text-align:left; color:var(--text); font-family:'DM Mono',monospace;}
  .quiz-opt:hover { border-color:var(--accent); }
  .quiz-opt.correct { border-color:var(--accent2); background:rgba(0,212,170,0.1); color:var(--accent2); }
  .quiz-opt.wrong   { border-color:var(--accent3); background:rgba(224,90,90,0.1);  color:var(--accent3); }
  .quiz-feedback { padding:1rem 1.25rem; border-radius:10px; font-size:0.85rem; margin-bottom:1rem; display:none; }
  .quiz-feedback.show { display:block; }
  .quiz-feedback.correct { background:rgba(0,212,170,0.1); border:1px solid rgba(0,212,170,0.3); color:var(--accent2); }
  .quiz-feedback.wrong   { background:rgba(224,90,90,0.1);  border:1px solid rgba(224,90,90,0.3);  color:var(--accent3); }

  /* ── SECTION LABELS ── */
  .section-label { font-size:0.7rem; color:var(--muted); text-transform:uppercase; letter-spacing:0.15em; margin-bottom:0.5rem; }
  .content-section { margin-bottom:2.5rem; }
  .content-section h2 { font-family:'Syne',sans-serif; font-weight:700; font-size:1.25rem; margin-bottom:1rem; display:flex; align-items:center; gap:0.75rem;}
  .content-section h2::after { content:''; flex:1; height:1px; background:var(--border); }
  .body-text { font-size:0.85rem; color:var(--muted); line-height:1.8; }

  /* ── RESPONSIVE ── */
  @media(max-width:768px){
    /* nav { width: 100%; position: fixed;} */
    .nav-logo{ font-size: 10px;}
    .nav-logo span{ font-size: 10px;}
    .nav-links a{ font-size: 8px; letter-spacing: 1px; display: none;}
    .nav-search{ width: 10px; padding-right: 30px;}
    .nav-search input{ font-size: 10px; width: 5px;}
    .hero-badge { top: 0%; width: 100%; font-size: 10px;}
    .hero h1 { font-size: 20px; font-family: sans-serif;}
    .hero p { font-size: 14px; font-family: sans-serif; width: 100%;}
    .detail-hero { grid-template-columns:1fr; }
    .btn-primary { font-size: 12px;}
    .btn-secondary { font-size: 12px;}
    .pros-cons { grid-template-columns:1fr; }
    .wiring-body { grid-template-columns:1fr; }
    .stats-bar { flex-direction:column; border-radius:12px; }
    .stat { border-right:none; border-bottom:1px solid var(--border); }
    .stat:last-child { border-bottom:none; }
    .detail-tabs-wrap { font-size: 10px;}
    .detail-tabs { font-size: 6px; width: 100%;}
    .dtab { font-size: 5.5px; float: left;}
    .coming-ai {
      border-radius: 26px;
      padding: 1rem;
      margin-top: 1rem;
      margin-bottom: 2rem;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
    }
    .btn-outline {
      margin-top: 25px;
      font-weight: 300;
      font-size: 14px;
      cursor: default;
      color: #fff;
    }
  }

  /* ── SCROLLBAR ── */
  ::-webkit-scrollbar { width:6px; }
  ::-webkit-scrollbar-track { background:var(--bg); }
  ::-webkit-scrollbar-thumb { background:var(--surface2); border-radius:3px; }
  ::-webkit-scrollbar-thumb:hover { background:var(--accent); }

  /* ── HIDDEN ── */
  [data-filter-card] { transition: opacity 0.3s, transform 0.3s; }
  [data-filter-card].hidden { opacity:0; pointer-events:none; height:0; overflow:hidden; margin:0; padding:0; }

   /* ── FOOTER SECTION── */
   footer { border-top: 1px solid var(--border); padding:3rem 2rem; text-align: center; color: var(--muted); font-size: 1rem;}
  .footer-logo { font-family:'Syne',sans-serif; font-weight: 800; font-size:1.2rem; color:var(--accent); margin-bottom:0.5rem; }
  .footer-logo span { color: var(--text); }
  
  /* FUTURE AI */
  .coming-ai {
      background: linear-gradient(145deg, #1875bd, #5d21ac);
      border-radius: 32px;
      font-size: 16px;
      padding: 1.2rem;
      margin-top: 2rem;
      margin-bottom: 3rem;
      border: 1px solid #bdd9e8;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
    }
    .btn-outline {
      background: transparent;
      border: 2px solid #9eb6c2;
      padding: 6px 20px;
      border-radius: 40px;
      font-weight: 600;
      cursor: default;
      color: #fff;
    }
    i { color: #00ffcc; margin-right: 10px; font-size: 18px;}
    i:hover { color: #00ffaa; transform: scale(1.2); transition: 0.3s;}