:root {
    --bg: #050810;
    --bg2: #0a1120;
    --card: rgba(255,255,255,0.04);
    --border: rgba(255,255,255,0.09);
    --txt: #e8edf5;
    --muted: #9aa7bd;
    --cyan: #38e1ff;
    --orange: #ff8a3d;
    --violet: #a78bfa;
    --green: #4ade80;
    --red: #f87171;
  }
  * { margin: 0; padding: 0; box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body {
    background: var(--bg);
    color: var(--txt);
    font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.7;
    overflow-x: hidden;
  }

  /* ---- Starfield background ---- */
  .stars {
    position: fixed; inset: 0; z-index: -1; pointer-events: none;
    background:
      radial-gradient(1px 1px at 20% 30%, rgba(255,255,255,.8), transparent),
      radial-gradient(1px 1px at 60% 70%, rgba(255,255,255,.6), transparent),
      radial-gradient(2px 2px at 80% 20%, rgba(255,255,255,.7), transparent),
      radial-gradient(1px 1px at 35% 80%, rgba(255,255,255,.5), transparent),
      radial-gradient(2px 2px at 90% 60%, rgba(255,255,255,.6), transparent),
      radial-gradient(1px 1px at 10% 60%, rgba(255,255,255,.7), transparent),
      radial-gradient(1.5px 1.5px at 45% 15%, rgba(255,255,255,.6), transparent),
      radial-gradient(1px 1px at 70% 45%, rgba(255,255,255,.5), transparent),
      radial-gradient(ellipse at 50% -20%, rgba(56,225,255,.12), transparent 60%),
      radial-gradient(ellipse at 50% 120%, rgba(255,138,61,.10), transparent 60%);
    background-repeat: repeat;
  }

  /* ---- Navigation ---- */
  nav {
    position: sticky; top: 0; z-index: 100;
    background: rgba(5,8,16,.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding: 12px 24px;
    display: flex; flex-wrap: wrap; gap: 6px 16px; align-items: center;
  }
  nav .logo { font-weight: 800; letter-spacing: 1px; color: var(--cyan); margin-right: auto; }
  nav a {
    color: var(--muted); text-decoration: none; font-size: .83rem;
    padding: 4px 8px; border-radius: 6px; transition: .2s;
  }
  nav a:hover { color: var(--cyan); background: rgba(56,225,255,.08); }

  .wrap { max-width: 1050px; margin: 0 auto; padding: 0 22px; }

  /* ---- Hero ---- */
  header {
    text-align: center;
    padding: 110px 22px 80px;
    position: relative;
  }
  .badge {
    display: inline-block; font-size: .8rem; letter-spacing: 2px; text-transform: uppercase;
    color: var(--cyan); border: 1px solid rgba(56,225,255,.4);
    padding: 6px 16px; border-radius: 999px; margin-bottom: 26px;
    background: rgba(56,225,255,.06);
  }
  h1 {
    font-size: clamp(2.2rem, 5.5vw, 4rem);
    line-height: 1.15; font-weight: 900;
    background: linear-gradient(120deg, #fff 20%, var(--cyan) 55%, var(--orange) 90%);
    -webkit-background-clip: text; background-clip: text; color: transparent;
    margin-bottom: 22px;
  }
  header p.sub {
    max-width: 780px; margin: 0 auto; color: var(--muted); font-size: 1.12rem;
  }
  .mach {
    margin-top: 40px; display: flex; justify-content: center; gap: 18px; flex-wrap: wrap;
  }
  .stat {
    background: var(--card); border: 1px solid var(--border); border-radius: 14px;
    padding: 16px 26px; min-width: 150px;
  }
  .stat b { display: block; font-size: 1.6rem; color: var(--orange); }
  .stat span { color: var(--muted); font-size: .85rem; }

  /* ---- Sections ---- */
  section { padding: 70px 0 30px; }
  h2 {
    font-size: clamp(1.5rem, 3vw, 2.1rem); font-weight: 800; margin-bottom: 8px;
    display: flex; align-items: center; gap: 14px;
  }
  h2 .num {
    flex: 0 0 auto; width: 44px; height: 44px; border-radius: 12px;
    display: grid; place-items: center; font-size: 1.05rem;
    background: linear-gradient(135deg, rgba(56,225,255,.18), rgba(167,139,250,.18));
    border: 1px solid var(--border); color: var(--cyan);
  }
  .lead { color: var(--muted); margin-bottom: 30px; max-width: 840px; }

  .grid { display: grid; gap: 18px; }
  .grid.c2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
  .grid.c3 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }

  .card {
    background: var(--card); border: 1px solid var(--border); border-radius: 16px;
    padding: 24px; transition: transform .25s, border-color .25s;
  }
  .card:hover { transform: translateY(-4px); border-color: rgba(56,225,255,.35); }
  .card h3 { font-size: 1.1rem; margin-bottom: 10px; color: #fff; }
  .card h3 .ico { margin-right: 8px; }
  .card p, .card li { color: var(--muted); font-size: .95rem; }
  .card ul { padding-left: 18px; margin-top: 8px; }
  .card li { margin-bottom: 6px; }
  .card li b { color: var(--txt); }

  .tag {
    display: inline-block; font-size: .72rem; font-weight: 700; letter-spacing: .5px;
    padding: 3px 10px; border-radius: 999px; margin-bottom: 10px; text-transform: uppercase;
  }
  .tag.ok   { color: var(--green); background: rgba(74,222,128,.1); border: 1px solid rgba(74,222,128,.3); }
  .tag.warn { color: var(--orange); background: rgba(255,138,61,.1); border: 1px solid rgba(255,138,61,.3); }
  .tag.no   { color: var(--red); background: rgba(248,113,113,.1); border: 1px solid rgba(248,113,113,.3); }
  .tag.info { color: var(--cyan); background: rgba(56,225,255,.1); border: 1px solid rgba(56,225,255,.3); }

  /* ---- Tesla gauges ---- */
  .gauge { margin: 14px 0 22px; }
  .gauge .lbl { display: flex; justify-content: space-between; font-size: .88rem; margin-bottom: 6px; flex-wrap: wrap; gap: 4px; }
  .gauge .lbl b { color: #fff; }
  .gauge .lbl span { color: var(--muted); }
  .bar { height: 14px; border-radius: 999px; background: rgba(255,255,255,.06); border: 1px solid var(--border); overflow: hidden; }
  .fill { height: 100%; border-radius: 999px; background: linear-gradient(90deg, var(--cyan), var(--violet), var(--orange)); }

  /* ---- Tables ---- */
  .table-scroll { overflow-x: auto; }
  table { width: 100%; border-collapse: collapse; margin: 18px 0; font-size: .93rem; }
  th, td { text-align: left; padding: 13px 16px; border-bottom: 1px solid var(--border); }
  th { color: var(--cyan); text-transform: uppercase; font-size: .76rem; letter-spacing: 1px; }
  td { color: var(--muted); }
  td b { color: var(--txt); }
  tr:hover td { background: rgba(255,255,255,.02); }

  /* ---- Formulas ---- */
  .formula {
    text-align: center; font-size: 1.25rem; padding: 22px; margin: 18px 0;
    background: rgba(167,139,250,.07); border: 1px solid rgba(167,139,250,.25);
    border-radius: 14px; color: #fff; font-family: Georgia, serif; font-style: italic;
    letter-spacing: 1px;
  }
  .formula small { display: block; font-size: .8rem; color: var(--muted); font-style: normal; margin-top: 8px; font-family: inherit; }

  /* ---- Callouts ---- */
  .callout {
    border-left: 4px solid var(--cyan); background: rgba(56,225,255,.06);
    padding: 18px 22px; border-radius: 0 14px 14px 0; margin: 22px 0; color: var(--muted);
  }
  .callout.warn { border-color: var(--orange); background: rgba(255,138,61,.07); }
  .callout.danger { border-color: var(--red); background: rgba(248,113,113,.07); }
  .callout.ok { border-color: var(--green); background: rgba(74,222,128,.06); }
  .callout b { color: #fff; }

  /* ---- Timeline ---- */
  .timeline { border-left: 2px solid rgba(56,225,255,.3); margin: 24px 0 24px 8px; padding-left: 28px; }
  .tl-item { position: relative; margin-bottom: 26px; }
  .tl-item::before {
    content: ""; position: absolute; left: -35px; top: 7px;
    width: 12px; height: 12px; border-radius: 50%;
    background: var(--cyan); box-shadow: 0 0 10px rgba(56,225,255,.6);
  }
  .tl-item b { color: var(--cyan); font-size: .95rem; }
  .tl-item p { color: var(--muted); font-size: .93rem; }

  /* ---- Glossary ---- */
  dl.glossary dt { color: var(--cyan); font-weight: 700; margin-top: 16px; }
  dl.glossary dd { color: var(--muted); margin-left: 0; font-size: .95rem; }

  footer {
    margin-top: 80px; padding: 40px 22px 60px; text-align: center;
    color: var(--muted); font-size: .85rem; border-top: 1px solid var(--border);
  }