:root {
      --bg-start: 255 255 255;      /* light */
      --bg-end:   241 245 249;
      --text:     15 23 42;
      --muted:    100 116 139;
      --brand:    59 130 246;       /* blue-500 */
      --surface:  255 255 255;
      --ring:     59 130 246;
      --shadow:   15 23 42 / 0.08;
    }

    @media (prefers-color-scheme: dark) {
      :root {
        --bg-start: 2 6 23;         /* slate-950 */
        --bg-end:   15 23 42;       /* slate-900 */
        --text:     226 232 240;    /* slate-200 */
        --muted:    148 163 184;    /* slate-400 */
        --brand:    96 165 250;     /* blue-400 */
        --surface:  15 23 42;       /* slate-900 */
        --shadow:   0 0 0 / 0.35;
      }
    }

    * { box-sizing: border-box; }
    html, body { height: 100%; }

    body {
      margin: 0;
      font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
      color: rgb(var(--text));
      background: linear-gradient(180deg, rgb(var(--bg-start)) 0%, rgb(var(--bg-end)) 100%);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    .container { width: min(1080px, 92%); margin: 0 auto; }

    /* Header */
    header {
      position: sticky; top: 0; z-index: 10;
      backdrop-filter: blur(10px);
      background: color-mix(in oklab, rgb(var(--surface)) 70%, transparent);
      border-bottom: 1px solid color-mix(in oklab, rgb(var(--surface)) 60%, transparent);
    }
    .nav { display: flex; align-items: center; justify-content: space-between; padding: 14px 0; }
    .brand { display: inline-flex; align-items: center; gap: .6rem; font-weight: 700; letter-spacing: .2px; }
    .badge { font-size: 12px; padding: 2px 8px; border-radius: 999px; border: 1px solid rgb(var(--brand)); color: rgb(var(--brand)); }
    .nav a { color: inherit; text-decoration: none; }

    /* Hero */
    .hero { padding: 64px 0 28px; text-align: center; }
    .hero h1 { font-size: clamp(28px, 4vw, 44px); line-height: 1.1; margin: 0 0 12px; }
    .hero p { margin: 0 auto; max-width: 56ch; color: rgb(var(--muted)); }

    .app-icon { width: 88px; height: 88px; border-radius: 22%; box-shadow: 0 14px 30px rgba(var(--shadow)); }

    .cta { display: flex; gap: 12px; justify-content: center; margin-top: 20px; flex-wrap: wrap; }
    .btn { appearance: none; border: 1px solid rgba(0,0,0,0); padding: 12px 16px; border-radius: 12px; cursor: pointer; font-weight: 600; text-decoration: none; display: inline-flex; align-items: center; gap: 8px; }
    .btn.primary { background: rgb(var(--brand)); color: white; }
    .btn.ghost { background: transparent; border-color: color-mix(in oklab, rgb(var(--text)) 12%, transparent); color: rgb(var(--text)); }
    .btn:focus-visible { outline: 3px solid rgb(var(--ring)); outline-offset: 2px; }

    /* Card */
    .card {
      background: rgb(var(--surface));
      border: 1px solid color-mix(in oklab, rgb(var(--text)) 10%, transparent);
      border-radius: 16px; padding: 22px; box-shadow: 0 10px 30px rgba(var(--shadow));
    }

    /* Features */
    .features { display: grid; grid-template-columns: repeat(12, 1fr); gap: 16px; margin: 36px 0; }
    .features .card { grid-column: span 12; }
    @media (min-width: 720px) { .features .card { grid-column: span 6; } }
    @media (min-width: 980px) { .features .card { grid-column: span 3; } }
    .feature-title { font-weight: 700; margin: 0 0 6px; }
    .feature-desc { margin: 0; color: rgb(var(--muted)); }

    /* Content sections */
    section { padding: 24px 0; }
    h2 { font-size: clamp(22px, 3vw, 28px); margin: 0 0 12px; }
    p { margin: 0 0 12px; }
    a { color: rgb(var(--brand)); }

    .grid-2 { display: grid; gap: 16px; grid-template-columns: 1fr; }
    @media (min-width: 860px) { .grid-2 { grid-template-columns: 1fr 1fr; } }

    .list { margin: 0; padding-left: 1.2rem; }
    .muted { color: rgb(var(--muted)); }

    /* Screenshots */
    .shots { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; align-items: start; justify-items: center; }
    .shot { background: rgb(var(--surface)); border: 1px solid color-mix(in oklab, rgb(var(--text)) 10%, transparent); border-radius: 16px; padding: 10px; box-shadow: 0 10px 30px rgba(var(--shadow)); width: 50%; }
    .shot img { width: 100%; height: auto; display: block; border-radius: 12px; }

   


    /* FAQ */
    details { border: 1px solid color-mix(in oklab, rgb(var(--text)) 10%, transparent); border-radius: 12px; padding: 14px 16px; background: rgb(var(--surface)); }
    details + details { margin-top: 10px; }
    summary { cursor: pointer; font-weight: 600; }
    details[open] { box-shadow: 0 10px 30px rgba(var(--shadow)); }

    /* Footer */
    footer { padding: 36px 0 48px; color: rgb(var(--muted)); font-size: 14px; }

    /* Motion */
    @media (prefers-reduced-motion: no-preference) {
      .btn, .card, details { transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease, background-color .2s ease; }
      .btn:hover { transform: translateY(-1px); }
      .card:hover { transform: translateY(-2px); }
    }