:root {
    --bg: #0a1412;
    --bg-raised: #0f1c19;
    --panel: #122220;
    --border: #1e3a35;
    --border-strong: #2a4f48;
    --text: #d7e6e2;
    --muted: #8aa39d;
    --faint: #5f7a74;
    --teal: #2fd4b2;
    --teal-deep: #14b394;
    --amber: #e8b649;
    --danger: #ef7466;
    --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
    --sans: "IBM Plex Sans", system-ui, sans-serif;
    --display: "Bricolage Grotesque", var(--sans);
    color-scheme: dark;
  }
  @media (prefers-color-scheme: light) {
    :root {
      --bg: #f4f7f6;
      --bg-raised: #ffffff;
      --panel: #ffffff;
      --border: #d5e0dd;
      --border-strong: #b7c9c4;
      --text: #142622;
      --muted: #4d6660;
      --faint: #7a918b;
      --teal: #0c8a70;
      --teal-deep: #0a7a63;
      --amber: #9a6d0c;
      --danger: #bf3a2c;
      color-scheme: light;
    }
  }

  * { margin: 0; padding: 0; box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--sans);
    font-size: 16.5px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
  }
  ::selection { background: var(--teal); color: var(--bg); }

  a { color: var(--teal); text-decoration: none; }
  a:hover { text-decoration: underline; text-underline-offset: 3px; }
  code, pre, kbd { font-family: var(--mono); }

  .wrap { max-width: 1060px; margin: 0 auto; padding: 0 24px; }

  /* ------------------------------------------------ header */
  header {
    position: sticky; top: 0; z-index: 50;
    backdrop-filter: blur(12px);
    background: color-mix(in srgb, var(--bg) 82%, transparent);
    border-bottom: 1px solid var(--border);
  }
  .nav { display: flex; align-items: center; gap: 28px; height: 60px; }
  .wordmark {
    font-family: var(--mono); font-weight: 600; font-size: 17px;
    color: var(--text); letter-spacing: -0.02em;
  }
  .wordmark:hover { text-decoration: none; }
  .wordmark .dollar { color: var(--teal); }
  .wordmark .blink {
    display: inline-block; width: 8px; height: 17px; margin-left: 2px;
    background: var(--teal); vertical-align: text-bottom;
    animation: blink 1.15s steps(1) infinite;
  }
  @keyframes blink { 50% { opacity: 0; } }
  .nav-links { display: flex; gap: 22px; margin-left: auto; }
  .nav-links a { color: var(--muted); font-size: 14.5px; font-weight: 500; }
  .nav-links a:hover { color: var(--text); text-decoration: none; }
  .nav-gh {
    border: 1px solid var(--border-strong); border-radius: 8px;
    padding: 5px 13px; color: var(--text) !important;
  }
  .nav-gh:hover { border-color: var(--teal); }
  @media (max-width: 720px) { .nav-links a:not(.nav-gh) { display: none; } }

  /* ------------------------------------------------ hero */
  .hero {
    position: relative; overflow: hidden;
    padding: 84px 0 72px;
    border-bottom: 1px solid var(--border);
  }
  /* CRT scanlines + phosphor glow — the TV in the room */
  .hero::before {
    content: ""; position: absolute; inset: 0; pointer-events: none;
    background:
      repeating-linear-gradient(0deg, transparent 0 3px, color-mix(in srgb, var(--teal) 4%, transparent) 3px 4px);
    mask-image: radial-gradient(70% 60% at 50% 30%, black, transparent 75%);
  }
  .hero::after {
    content: ""; position: absolute; inset: -30% -10% auto; height: 90%;
    pointer-events: none;
    background: radial-gradient(45% 55% at 50% 8%, color-mix(in srgb, var(--teal) 13%, transparent), transparent 70%);
  }
  .hero-inner { position: relative; z-index: 1; text-align: center; }
  .hero .tag {
    display: inline-flex; align-items: center; gap: 8px;
    font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.08em;
    text-transform: uppercase; color: var(--amber);
    border: 1px solid color-mix(in srgb, var(--amber) 35%, transparent);
    background: color-mix(in srgb, var(--amber) 7%, transparent);
    border-radius: 99px; padding: 5px 14px; margin-bottom: 26px;
  }
  .hero .tag::before {
    content: ""; width: 7px; height: 7px; border-radius: 50%;
    background: var(--amber);
    box-shadow: 0 0 8px var(--amber);
    animation: standby 2.4s ease-in-out infinite;
  }
  @keyframes standby { 50% { opacity: 0.35; box-shadow: 0 0 2px var(--amber); } }
  h1 {
    font-family: var(--display);
    font-size: clamp(38px, 6vw, 64px);
    font-weight: 800; line-height: 1.04; letter-spacing: -0.025em;
    max-width: 17ch; margin: 0 auto;
  }
  h1 em { font-style: normal; color: var(--teal); }
  .hero p.sub {
    max-width: 56ch; margin: 22px auto 0; color: var(--muted); font-size: 18px;
  }
  /* install command - the hero's centerpiece */
  .install-box { max-width: 740px; margin: 34px auto 0; }
  .install-tabs { display: flex; gap: 6px; justify-content: center; margin-bottom: 10px; }
  .install-tab {
    font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.04em;
    color: var(--muted); background: none; cursor: pointer;
    border: 1px solid var(--border); border-radius: 8px; padding: 5px 14px;
  }
  .install-tab.active { color: var(--teal); border-color: var(--teal); background: color-mix(in srgb, var(--teal) 8%, transparent); }
  .install-cmd[hidden] { display: none; }
  .install-cmd {
    display: flex; align-items: center; gap: 12px;
    background: #0b100f; border: 1px solid var(--teal);
    box-shadow: 0 0 0 5px color-mix(in srgb, var(--teal) 8%, transparent),
                0 14px 40px -18px color-mix(in srgb, var(--teal) 55%, transparent);
    border-radius: 12px; padding: 15px 18px;
  }
  @media (prefers-color-scheme: light) { .install-cmd { background: #0f1c19; } }
  .install-cmd code {
    flex: 1; text-align: left; font-size: 14.5px; color: #cfe3de;
    overflow-x: auto; white-space: nowrap;
  }
  .install-cmd .p { color: var(--teal); user-select: none; }
  .copy-btn {
    flex: none; font-family: var(--mono); font-size: 12px; cursor: pointer;
    color: var(--teal); background: none;
    border: 1px solid var(--border-strong); border-radius: 7px; padding: 5px 12px;
  }
  .copy-btn:hover { border-color: var(--teal); }
  .install-note { margin-top: 11px; font-size: 13px; color: var(--faint); }
  .cta-row { display: flex; gap: 14px; justify-content: center; margin-top: 22px; flex-wrap: wrap; }
  .btn {
    display: inline-flex; align-items: center; gap: 9px;
    font-weight: 600; font-size: 15.5px; border-radius: 10px;
    padding: 11px 22px; transition: transform 0.12s ease, box-shadow 0.12s ease;
  }
  .btn:hover { text-decoration: none; transform: translateY(-1px); }
  .btn-primary {
    background: var(--teal); color: #06231c;
    box-shadow: 0 0 0 1px color-mix(in srgb, var(--teal) 60%, transparent),
                0 8px 28px -10px color-mix(in srgb, var(--teal) 55%, transparent);
  }
  .btn-primary:hover { box-shadow: 0 0 0 1px var(--teal), 0 12px 34px -10px color-mix(in srgb, var(--teal) 70%, transparent); }
  .btn-ghost { border: 1px solid var(--border-strong); color: var(--text); }
  .btn-ghost:hover { border-color: var(--teal); }

  .demo-frame {
    margin: 56px auto 0; max-width: 920px;
    border: 1px solid var(--border-strong); border-radius: 14px;
    overflow: hidden; background: #101614;
    box-shadow: 0 30px 80px -30px rgba(0,0,0,0.6),
                0 0 0 6px color-mix(in srgb, var(--teal) 5%, transparent);
  }
  .demo-frame video, .demo-frame img { display: block; width: 100%; height: auto; }
  .demo-caption { margin-top: 14px; font-size: 14px; color: var(--faint); }

  /* ------------------------------------------------ sections */
  section { padding: 78px 0; border-bottom: 1px solid var(--border); }
  .kicker {
    font-family: var(--mono); font-size: 13px; letter-spacing: 0.14em;
    text-transform: uppercase; color: var(--teal); margin-bottom: 12px;
  }
  h2 {
    font-family: var(--display); font-weight: 800;
    font-size: clamp(26px, 3.6vw, 36px); letter-spacing: -0.02em; line-height: 1.15;
  }
  .section-sub { color: var(--muted); max-width: 62ch; margin-top: 12px; }

  /* why cards */
  .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 40px; }
  @media (max-width: 820px) { .grid-3 { grid-template-columns: 1fr; } }
  .card {
    background: var(--panel); border: 1px solid var(--border);
    border-radius: 14px; padding: 26px 24px;
  }
  .card h3 { font-family: var(--display); font-size: 19px; font-weight: 600; margin-bottom: 9px; }
  .card p { color: var(--muted); font-size: 15px; }
  .card .num {
    font-family: var(--mono); color: var(--amber); font-size: 13px; margin-bottom: 14px; display: block;
  }

  /* steps rail */
  .steps { margin-top: 44px; display: grid; gap: 0; position: relative; }
  .step {
    display: grid; grid-template-columns: 56px 1fr; gap: 18px;
    padding: 22px 0; border-top: 1px dashed var(--border);
  }
  .step:first-child { border-top: none; }
  .step .dot {
    width: 40px; height: 40px; border-radius: 12px;
    display: grid; place-items: center;
    font-family: var(--mono); font-weight: 600; color: var(--teal);
    border: 1px solid var(--border-strong);
    background: var(--bg-raised);
  }
  .step h3 { font-size: 17px; font-weight: 600; }
  .step p { color: var(--muted); font-size: 15px; margin-top: 4px; }
  .step code { color: var(--teal); font-size: 0.92em; }

  /* features */
  .feat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 40px; }
  @media (max-width: 900px) { .feat-grid { grid-template-columns: repeat(2, 1fr); } }
  @media (max-width: 620px) { .feat-grid { grid-template-columns: 1fr; } }
  .feat {
    border: 1px solid var(--border); border-radius: 12px; padding: 20px;
    background: linear-gradient(180deg, var(--panel), transparent);
  }
  .feat .ico { font-size: 19px; margin-bottom: 10px; display: block; }
  .feat h3 { font-size: 15.5px; font-weight: 600; margin-bottom: 6px; }
  .feat p { font-size: 14px; color: var(--muted); }

  /* quick start */
  .term {
    background: #0b100f; border: 1px solid var(--border-strong);
    border-radius: 12px; margin-top: 28px; overflow: hidden;
  }
  @media (prefers-color-scheme: light) { .term { background: #0f1c19; } }
  .term-bar {
    display: flex; align-items: center; gap: 7px;
    padding: 11px 16px; border-bottom: 1px solid var(--border);
  }
  .term-bar i { width: 11px; height: 11px; border-radius: 50%; background: var(--border-strong); }
  .term-bar i:first-child { background: var(--danger); opacity: .8; }
  .term-bar i:nth-child(2) { background: var(--amber); opacity: .8; }
  .term-bar i:nth-child(3) { background: var(--teal); opacity: .8; }
  .term-bar span { margin-left: auto; font-family: var(--mono); font-size: 12px; color: var(--faint); }
  .term pre {
    padding: 20px 22px; overflow-x: auto;
    font-size: 14px; line-height: 1.9; color: #cfe3de;
  }
  .term .c { color: #5f7a74; }
  .term .p { color: var(--teal); user-select: none; }

  /* reference tables */
  table { width: 100%; border-collapse: collapse; margin-top: 26px; font-size: 14.5px; }
  th {
    text-align: left; font-family: var(--mono); font-size: 12px;
    text-transform: uppercase; letter-spacing: 0.1em; color: var(--faint);
    padding: 0 14px 10px; border-bottom: 1px solid var(--border-strong);
  }
  td { padding: 12px 14px; border-bottom: 1px solid var(--border); vertical-align: top; }
  td:first-child { white-space: nowrap; }
  td code, kbd {
    background: var(--bg-raised); border: 1px solid var(--border);
    border-radius: 6px; padding: 2px 8px; font-size: 13px;
  }
  kbd { color: var(--teal); }
  .table-scroll { overflow-x: auto; }

  /* seal */
  .seal {
    margin-top: 44px; display: flex; gap: 20px; align-items: center;
    border: 1px solid color-mix(in srgb, var(--amber) 30%, transparent);
    background: color-mix(in srgb, var(--amber) 5%, transparent);
    border-radius: 14px; padding: 22px 26px;
  }
  .seal .stamp {
    flex: none; width: 62px; height: 62px; border-radius: 50%;
    border: 2px dashed var(--amber); display: grid; place-items: center;
    font-size: 26px;
  }
  .seal p { font-size: 15px; color: var(--muted); }
  .seal strong { color: var(--text); }

  /* faq */
  details {
    border: 1px solid var(--border); border-radius: 12px;
    margin-top: 12px; background: var(--panel);
  }
  summary {
    cursor: pointer; padding: 17px 20px; font-weight: 600; font-size: 15.5px;
    list-style: none; display: flex; align-items: center; gap: 12px;
  }
  summary::before {
    content: "+"; font-family: var(--mono); color: var(--teal);
    font-size: 18px; transition: transform 0.15s ease;
  }
  details[open] summary::before { transform: rotate(45deg); }
  details .body { padding: 0 20px 18px 46px; color: var(--muted); font-size: 15px; }
  details .body code { color: var(--teal); font-size: 0.92em; }

  /* footer */
  footer { padding: 44px 0 60px; }
  .foot { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; color: var(--faint); font-size: 14px; }
  .foot .spacer { margin-left: auto; display: flex; gap: 18px; }

  /* reveal on scroll */
  .reveal { opacity: 0; transform: translateY(14px); transition: opacity .5s ease, transform .5s ease; }
  .reveal.in { opacity: 1; transform: none; }
  @media (prefers-reduced-motion: reduce) {
    .reveal { opacity: 1; transform: none; transition: none; }
    .blink, .tag::before { animation: none !important; }
  }