/* ============================================================
     "The Backlight" — one light source, everything lit by it.
     Warm near-black, hairlines instead of cards, system SF +
     ui-serif accents, tabular numerals, film grain.
     ============================================================ */
  :root {
    --bg: #0b0a08;
    --bg-2: #141210;
    --text: #f5f1e8;
    --muted: #a69e8f;
    --faint: #6e675b;
    --accent: #ffa028;
    --accent-hot: #ff7a1a;
    --gold: #ffd27a;
    --red: #ff5a48;
    --hairline: rgba(255,209,122,0.14);
    --maxw: 1120px;
  }
  * { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; overflow-x: clip; }
  body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.45;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
  }
  /* Film grain: kills the flat-vector look, zero requests (feTurbulence data URI). */
  body::after {
    content: ""; position: fixed; inset: 0; z-index: 90; pointer-events: none;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='280' height='280'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2'/%3E%3C/filter%3E%3Crect width='280' height='280' filter='url(%23n)'/%3E%3C/svg%3E");
    opacity: 0.035; mix-blend-mode: overlay;
  }
  a { color: inherit; text-decoration: none; }
  .wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
  .serif { font-family: ui-serif, "New York", Georgia, serif; font-style: italic; font-weight: 500; letter-spacing: -0.01em; }
  .num { font-variant-numeric: tabular-nums; }
  .kicker {
    font-size: 12.5px; letter-spacing: 0.14em; text-transform: uppercase;
    color: var(--faint); font-weight: 600; margin-bottom: 14px;
  }
  h2 { font-size: 40px; letter-spacing: -0.03em; line-height: 1.08; font-weight: 650; }

  /* Reveals: hidden only when JS is present; reduced-motion opts out in main.js. */
  .js .reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s cubic-bezier(.22,1,.36,1), transform .6s cubic-bezier(.22,1,.36,1); }
  .js .reveal.in { opacity: 1; transform: none; }
  .js .reveal:nth-child(2) { transition-delay: .07s; }
  .js .reveal:nth-child(3) { transition-delay: .14s; }
  .js .reveal:nth-child(4) { transition-delay: .21s; }

  /* ---- nav ---- */
  nav {
    position: sticky; top: 0; z-index: 50;
    backdrop-filter: saturate(140%) blur(16px);
    background: rgba(11,10,8,0.72);
    border-bottom: 1px solid var(--hairline);
  }
  nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; }
  .brand { display: flex; align-items: center; gap: 10px; font-weight: 650; font-size: 17px; letter-spacing: -0.01em; }
  .brand-logo { width: 38px; height: 25px; display: block; object-fit: contain; }
  .nav-links { display: flex; gap: 26px; align-items: center; }
  .nav-links a:not(.btn) { color: var(--muted); font-size: 14px; transition: color .15s; }
  .nav-links a:not(.btn):hover { color: var(--text); }
  .btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    background: var(--accent); color: #201304;
    font-weight: 650; font-size: 15px;
    padding: 12px 22px; border-radius: 8px;
    transition: transform .15s, filter .15s;
    white-space: nowrap;
  }
  .btn:hover { transform: translateY(-1px); filter: brightness(1.07); }
  .btn.small { padding: 8px 16px; font-size: 13.5px; }
  .btn.ghost {
    background: transparent; color: var(--text);
    border: 1px solid var(--hairline); font-weight: 550;
  }
  .btn.ghost:hover { background: rgba(255,209,122,0.06); filter: none; }
  .btn.primary { background: linear-gradient(120deg, var(--accent-hot), var(--accent)); }

  /* ---- hero ---- */
  .hero { position: relative; padding: 100px 0 84px; border-bottom: 1px solid var(--hairline); }
  .hero-grid { position: relative; display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 56px; align-items: center; }
  .hero-icon { width: 150px; height: 94px; display: block; margin-bottom: 20px; object-fit: contain; }
  .eyebrow { font-size: 12.5px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); font-weight: 600; margin-bottom: 22px; display: block; }
  h1 { font-size: 66px; line-height: 1.03; letter-spacing: -0.038em; font-weight: 650; margin-bottom: 8px; }
  h1 .serif { color: var(--accent); font-size: 0.97em; }
  .hero p.sub { font-size: 18.5px; color: var(--muted); max-width: 520px; margin: 18px 0 32px; line-height: 1.55; }
  .hero-cta { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
  .price-note { font-size: 14px; color: var(--faint); }
  .req { margin-top: 24px; font-size: 13px; color: var(--faint); }
  .req .tick { color: var(--gold); }

  /* ---- dial demo (interactive) ---- */
  .dial-side { position: relative; }
  /* The one light source: a tight glow + faint rays behind the dial, driven by the slider. */
  .sun-glow {
    position: absolute; inset: -12%; pointer-events: none; z-index: 0;
    background:
      radial-gradient(closest-side at 50% 42%, rgba(255,160,40,0.22), rgba(255,160,40,0) 68%),
      conic-gradient(from 0deg at 50% 42%,
        rgba(255,210,122,0.05) 0deg, transparent 14deg, rgba(255,210,122,0.05) 28deg, transparent 42deg,
        rgba(255,210,122,0.05) 56deg, transparent 70deg, rgba(255,210,122,0.05) 84deg, transparent 98deg,
        rgba(255,210,122,0.05) 112deg, transparent 126deg, rgba(255,210,122,0.05) 140deg, transparent 154deg,
        rgba(255,210,122,0.05) 168deg, transparent 182deg, rgba(255,210,122,0.05) 196deg, transparent 210deg,
        rgba(255,210,122,0.05) 224deg, transparent 238deg, rgba(255,210,122,0.05) 252deg, transparent 266deg,
        rgba(255,210,122,0.05) 280deg, transparent 294deg, rgba(255,210,122,0.05) 308deg, transparent 322deg,
        rgba(255,210,122,0.05) 336deg, transparent 350deg);
    filter: blur(6px); opacity: 0.6; transition: opacity .3s;
  }
  .dial-card {
    position: relative; z-index: 1;
    background: var(--bg-2);
    border: 1px solid var(--hairline);
    border-radius: 16px; padding: 26px; width: min(310px, 100%); margin: 0 auto;
    box-shadow: 0 30px 80px rgba(0,0,0,0.55);
  }
  .dial-head { display: flex; align-items: center; gap: 9px; margin-bottom: 16px; }
  .dial-head b { font-size: 15px; font-weight: 650; }
  .dial-head svg { color: var(--accent); }
  .dial-wrap { display: flex; justify-content: center; padding: 4px 0 8px; }
  .dial { position: relative; width: 172px; max-width: 100%; aspect-ratio: 1; }
  .dial svg.ring { width: 100%; height: 100%; transform: rotate(-90deg); }
  .dial .center { position: absolute; inset: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; }
  .dial .pct { font-size: 42px; font-weight: 650; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
  .dial .nits { font-size: 10px; font-weight: 600; color: var(--muted); letter-spacing: 0.22em; margin-top: 3px; }
  .dial .zone { font-size: 11px; color: var(--faint); letter-spacing: 0.08em; margin-top: 2px; font-variant-numeric: tabular-nums; }
  /* Slider — this is the demo: drag it, the panel "gets brighter". */
  .nit-slider { margin: 12px 2px 4px; }
  .nit-slider input {
    -webkit-appearance: none; appearance: none; width: 100%; height: 3px; border-radius: 2px;
    background: linear-gradient(90deg, rgba(255,255,255,0.18), var(--accent) 60%, var(--gold));
    outline: none; cursor: ew-resize;
  }
  .nit-slider input::-webkit-slider-thumb {
    -webkit-appearance: none; width: 18px; height: 18px; border-radius: 50%;
    background: #fff; border: none; box-shadow: 0 1px 6px rgba(0,0,0,0.5);
  }
  .nit-slider .hint { display: flex; justify-content: space-between; font-size: 10.5px; color: var(--faint); margin-top: 7px; font-variant-numeric: tabular-nums; letter-spacing: 0.04em; }
  .legend { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap;
            font-size: 11px; color: var(--faint); margin: 12px 0 4px; font-variant-numeric: tabular-nums; }
  .legend i { display: inline-block; width: 7px; height: 7px; border-radius: 50%; margin-right: 5px; vertical-align: 0; }
  .try-note { text-align: center; font-size: 11.5px; color: var(--faint); margin-top: 10px; }

  /* ---- sections ---- */
  section { padding: 88px 0; border-bottom: 1px solid var(--hairline); }
  .section-head { max-width: 640px; margin-bottom: 56px; }
  .section-head.center { text-align: center; margin-left: auto; margin-right: auto; }
  .section-head p { color: var(--muted); font-size: 17px; margin-top: 14px; line-height: 1.55; }
  .accent-word { color: var(--accent); }

  /* pillars: three columns, hairlines, numbered — no cards */
  .pillars { display: grid; grid-template-columns: repeat(3, 1fr); }
  .pillar { padding: 8px 32px 8px 0; }
  .pillar + .pillar { border-left: 1px solid var(--hairline); padding-left: 32px; }
  .pillar .n { font-size: 13px; color: var(--faint); font-variant-numeric: tabular-nums; letter-spacing: 0.08em; display: block; margin-bottom: 18px; }
  .pillar svg { color: var(--gold); margin-bottom: 14px; display: block; }
  .pillar h3 { font-size: 19px; margin-bottom: 10px; letter-spacing: -0.015em; font-weight: 650; }
  .pillar p { color: var(--muted); font-size: 15px; line-height: 1.6; }

  /* features: 2 large + 4 compact — varied, not a uniform grid */
  .features-hero { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; margin-bottom: 56px; }
  .feature-big h3 { font-size: 24px; letter-spacing: -0.02em; margin: 14px 0 10px; font-weight: 650; }
  .feature-big p { color: var(--muted); font-size: 16px; line-height: 1.6; max-width: 440px; }
  .feature-big svg { color: var(--accent); }
  .features-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 36px; padding-top: 44px; border-top: 1px solid var(--hairline); }
  .feature h3 { font-size: 16px; margin: 12px 0 7px; font-weight: 650; letter-spacing: -0.01em; }
  .feature p { color: var(--muted); font-size: 14px; line-height: 1.55; }
  .feature svg { color: var(--gold); }
  .feature.red svg, .feature.red h3 { color: var(--red); }

  /* comparison */
  .compare-wrap { overflow-x: auto; border: 1px solid var(--hairline); border-radius: 12px; background: var(--bg-2); }
  table { width: 100%; border-collapse: collapse; min-width: 720px; }
  th, td { padding: 15px 16px; text-align: center; font-size: 14.5px; border-bottom: 1px solid rgba(255,209,122,0.08); font-variant-numeric: tabular-nums; }
  th:first-child, td:first-child { text-align: left; color: var(--muted); font-weight: 500; }
  thead th { font-weight: 650; font-size: 13.5px; color: var(--faint); }
  thead th.us { color: var(--accent); font-size: 15.5px; }
  td.us { background: rgba(255,160,40,0.05); }
  tbody tr:last-child td { border-bottom: none; }
  .yes { color: var(--gold); font-weight: 700; }
  .no { color: #4a453d; }
  .price-row td { font-weight: 650; color: var(--text); }

  /* compatibility: two plain lists, one hairline between */
  .compat-grid { display: grid; grid-template-columns: 1fr 1fr; max-width: 880px; margin: 0 auto; }
  .compat-col { padding: 8px 40px 8px 0; }
  .compat-col + .compat-col { border-left: 1px solid var(--hairline); padding-left: 40px; }
  .compat-col h3 { font-size: 16px; margin-bottom: 20px; letter-spacing: -0.01em; font-weight: 650; }
  .compat-col.ok h3 { color: var(--accent); }
  .compat-col.no h3 { color: var(--red); }
  .compat-col ul { list-style: none; display: grid; gap: 13px; }
  .compat-col li { color: var(--muted); font-size: 15px; padding-left: 26px; position: relative; line-height: 1.5; }
  .compat-col li::before { position: absolute; left: 0; font-weight: 700; }
  .compat-col.ok li::before { content: "✓"; color: var(--gold); }
  .compat-col.no li::before { content: "—"; color: var(--red); }
  .compat-note { text-align: center; color: var(--faint); font-size: 14px; max-width: 640px; margin: 40px auto 0; line-height: 1.6; }

  /* pricing */
  .pricing { display: flex; justify-content: center; }
  .price-card {
    background: var(--bg-2);
    border: 1px solid var(--hairline); border-radius: 16px;
    padding: 44px; max-width: 430px; width: 100%; text-align: center;
  }
  .price-card .big { font-size: 64px; font-weight: 650; letter-spacing: -0.035em; font-variant-numeric: tabular-nums; color: var(--text); }
  .price-card .once { color: var(--faint); font-size: 13px; letter-spacing: 0.12em; text-transform: uppercase; margin-bottom: 4px; }
  .price-card ul { list-style: none; text-align: left; margin: 28px 0; display: grid; gap: 12px; }
  .price-card li { display: flex; gap: 11px; align-items: flex-start; color: var(--text); font-size: 15px; }
  .price-card li .ck { color: var(--gold); font-weight: 700; }
  .price-card .btn { width: 100%; font-size: 16px; padding: 14px; }
  .price-card .req { margin-top: 18px; }

  /* faq: borderless rows, hairline dividers */
  .faq { max-width: 760px; margin: 0 auto; }
  details { border-bottom: 1px solid var(--hairline); }
  details:first-of-type { border-top: 1px solid var(--hairline); }
  summary { cursor: pointer; padding: 20px 4px; font-weight: 600; font-size: 16.5px; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 16px; }
  summary::-webkit-details-marker { display: none; }
  summary::after { content: "+"; color: var(--accent); font-size: 22px; font-weight: 300; flex-shrink: 0; }
  details[open] summary::after { content: "–"; }
  details p { color: var(--muted); padding: 0 4px 22px; font-size: 15px; line-height: 1.65; }
  details a { color: var(--accent); }

  /* footer */
  footer { padding: 44px 0 52px; color: var(--faint); }
  footer .wrap { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; font-size: 14px; }
  footer a { color: var(--muted); }
  footer a:hover { color: var(--text); }
  .footer-logo { width: 32px; height: 21px; display: block; object-fit: contain; }

  @media (max-width: 880px) {
    h1 { font-size: 44px; }
    h2 { font-size: 31px; }
    .hero { padding: 64px 0 52px; }
    .hero-grid { grid-template-columns: 1fr; gap: 48px; }
    .pillars, .compat-grid { grid-template-columns: 1fr; }
    .pillar + .pillar { border-left: none; border-top: 1px solid var(--hairline); padding: 28px 0 8px; margin-top: 24px; }
    .compat-col { padding-right: 0; }
    .compat-col + .compat-col { border-left: none; border-top: 1px solid var(--hairline); padding: 32px 0 8px; margin-top: 28px; }
    .features-hero { grid-template-columns: 1fr; gap: 36px; }
    .features-row { grid-template-columns: 1fr 1fr; gap: 30px; }
    .nav-links a:not(.btn) { display: none; }
    section { padding: 64px 0; }
  }

  /* ---- comparison pages ---- */
  .cmp-hero { padding: 84px 0 56px; border-bottom: 1px solid var(--hairline); }
  .cmp-hero h1 { font-size: 52px; line-height: 1.05; letter-spacing: -0.035em; font-weight: 650; margin-bottom: 18px; }
  .cmp-hero p { font-size: 18px; color: var(--muted); max-width: 620px; line-height: 1.55; }
  .verdict { display: grid; grid-template-columns: 1fr 1fr; gap: 0; max-width: 880px; margin: 0 auto; }
  .verdict-col { padding: 8px 40px 8px 0; }
  .verdict-col + .verdict-col { border-left: 1px solid var(--hairline); padding-left: 40px; }
  .verdict-col h3 { font-size: 17px; margin-bottom: 16px; letter-spacing: -0.01em; font-weight: 650; }
  .verdict-col.pick-us h3 { color: var(--accent); }
  .verdict-col.pick-them h3 { color: var(--muted); }
  .verdict-col p { color: var(--muted); font-size: 15px; line-height: 1.6; }
  .cmp-note { max-width: 720px; margin: 40px auto 0; color: var(--faint); font-size: 14px; line-height: 1.65; text-align: center; }
  @media (max-width: 880px) {
    .cmp-hero h1 { font-size: 38px; }
    .verdict { grid-template-columns: 1fr; }
    .verdict-col { padding-right: 0; }
    .verdict-col + .verdict-col { border-left: none; border-top: 1px solid var(--hairline); padding: 32px 0 8px; margin-top: 28px; }
  }