:root{
    /* Typography */
    --font-sans: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";

    /* Colors */
    --bg: #ffffff;
    --text: #0b0f16;
    --muted: rgba(11, 15, 22, 0.68);
    --muted-2: rgba(11, 15, 22, 0.52);
    --border: rgba(11, 15, 22, 0.10);

    --surface: rgba(255, 255, 255, 0.72);
    --surface-2: rgba(255, 255, 255, 0.88);

    --blue: #0071e3; /* Apple-like blue */
    --blue-2: #2aa7ff;
    --blue-ink: #0a60c6;

    --green: #22c55e;
    --amber: #f59e0b;

    /* Effects */
    --shadow-sm: 0 8px 24px rgba(0,0,0,0.08);
    --shadow-md: 0 18px 60px rgba(0,0,0,0.12);
    --shadow-inset: inset 0 1px 0 rgba(255,255,255,0.6);

    --radius-sm: 12px;
    --radius-md: 18px;
    --radius-lg: 26px;

    /* Spacing */
    --container: 1120px;
    --pad-x: 24px;

    /* Motion */
    --ease: cubic-bezier(.22, 1, .36, 1);
    --dur: 700ms;
  }

  * { box-sizing: border-box; }
  html, body {
      height: 100%; /* Ensure html and body can take full height */
      min-height: 100%; /* Ensure html and body always take at least full viewport height */
      margin: 0; /* Remove default margin that can affect height calculation */
      padding: 0; /* Remove default padding that can affect height calculation */
  }
  body{
    margin: 0;
    font-family: var(--font-sans);
    color: var(--text);
    background: var(--bg);
    line-height: 1.45;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }

  a{ color: inherit; text-decoration: none; }
  a:hover{ text-decoration: none; }

  /* Layout primitives */
  .container{
    width: 100%;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--pad-x);
  }

  .stack{ display: grid; gap: 16px; }
  .stack-lg{ display: grid; gap: 28px; }
  .row{ display: flex; align-items: center; justify-content: space-between; gap: 18px; }

  /* Top nav */
  .nav{
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 2000;
    background: rgba(255,255,255,0.72);
    backdrop-filter: saturate(180%) blur(18px);
    border-bottom: 1px solid var(--border);
  }
  .nav-inner{
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
  }
  .brand{
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 650;
    letter-spacing: -0.02em;
  }
  .brand-mark{
    width: 28px;
    height: 28px;
    border-radius: 9px;
    background: radial-gradient(120% 120% at 30% 20%, var(--blue-2), var(--blue));
    box-shadow: 0 10px 20px rgba(0,113,227,0.22);
    position: relative;
    overflow: hidden;
    flex: 0 0 auto;
  }
  .brand-mark::after{
    content:"";
    position:absolute;
    inset:-40%;
    background: radial-gradient(circle at 30% 20%, rgba(255,255,255,0.65), rgba(255,255,255,0) 55%);
    transform: rotate(18deg);
  }
  .nav-links{
    display: flex;
    gap: 18px;
    align-items: center;
    color: var(--muted);
    font-size: 14px;
  }
  .nav-links a{
    padding: 8px 10px;
    border-radius: 10px;
    transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
  }
  .nav-links a:hover{
    background: rgba(11,15,22,0.04);
    color: rgba(11,15,22,0.82);
  }

  /* Buttons */
  .btn{
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    border-radius: 999px;
    padding: 12px 16px;
    font-weight: 650;
    letter-spacing: -0.01em;
    border: 1px solid transparent;
    transition: transform 180ms var(--ease), box-shadow 180ms var(--ease), background 180ms var(--ease), border-color 180ms var(--ease);
    user-select: none;
    white-space: nowrap;
  }
  .btn:focus-visible{
    outline: 3px solid rgba(0,113,227,0.28);
    outline-offset: 2px;
  }
  .btn-primary{
    background: linear-gradient(180deg, var(--blue-2), var(--blue));
    color: #fff;
    box-shadow: 0 14px 36px rgba(0,113,227,0.24);
  }
  .btn-primary:hover{ transform: translateY(-1px); box-shadow: 0 18px 50px rgba(0,113,227,0.28); }
  .btn-secondary{
    background: rgba(11,15,22,0.04);
    border-color: rgba(11,15,22,0.10);
    color: rgba(11,15,22,0.84);
  }
  .btn-secondary:hover{ transform: translateY(-1px); background: rgba(11,15,22,0.06); }

  .btn-icon{
    width: 38px;
    height: 38px;
    padding: 0;
    border-radius: 999px;
    border: 1px solid rgba(11,15,22,0.10);
    background: rgba(255,255,255,0.7);
    box-shadow: var(--shadow-sm);
  }

  /* Hero */
  .hero{
    position: relative;
    overflow: hidden;
    padding: 84px 0 48px;
  }
  .hero::before{
    content:"";
    position:absolute;
    inset: -30% -20% auto -20%;
    height: 520px;
    background: radial-gradient(closest-side at 30% 35%, rgba(42,167,255,0.34), rgba(0,113,227,0.00) 68%),
                radial-gradient(closest-side at 70% 30%, rgba(0,113,227,0.22), rgba(0,113,227,0.00) 70%),
                radial-gradient(closest-side at 60% 80%, rgba(245,158,11,0.12), rgba(245,158,11,0.00) 70%);
    filter: blur(2px);
    pointer-events: none;
  }

  .hero-grid{
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 42px;
    align-items: center;
  }

  .kicker{
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    border-radius: 999px;
    border: 1px solid rgba(11,15,22,0.10);
    background: rgba(255,255,255,0.72);
    box-shadow: var(--shadow-sm);
    font-size: 13px;
    color: rgba(11,15,22,0.76);
    width: fit-content;
  }
  .dot{
    width: 9px; height: 9px; border-radius: 99px;
    background: var(--green);
    box-shadow: 0 0 0 4px rgba(34,197,94,0.16);
  }

  h1{
    margin: 14px 0 0;
    font-size: clamp(34px, 4.2vw, 56px);
    line-height: 1.05;
    letter-spacing: -0.03em;
  }
  .hero p.lead{
    margin: 14px 0 0;
    font-size: 18px;
    color: var(--muted);
    max-width: 60ch;
  }

  .hero-bullets{
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 18px;
    color: rgba(11,15,22,0.76);
    font-size: 13px;
  }
  .pill{
    padding: 8px 10px;
    border-radius: 999px;
    background: rgba(11,15,22,0.04);
    border: 1px solid rgba(11,15,22,0.08);
  }

  .hero-actions{
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 22px;
    align-items: center;
  }
  .subtext{
    margin-top: 10px;
    font-size: 13px;
    color: var(--muted-2);
    max-width: 62ch;
  }

  /* “Device” mock */
  .mock{
    position: relative;
    border-radius: var(--radius-lg);
    border: 1px solid rgba(11,15,22,0.10);
    background: linear-gradient(180deg, rgba(255,255,255,0.92), rgba(255,255,255,0.62));
    box-shadow: var(--shadow-md);
    overflow: hidden;
    padding: 18px;
  }

  .mock-top{
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 10px 10px 14px;
  }
  .mock-title{
    font-weight: 650;
    letter-spacing: -0.02em;
  }
  .mock-badge{
    font-size: 12px;
    color: rgba(11,15,22,0.70);
    padding: 6px 10px;
    border-radius: 999px;
    border: 1px solid rgba(11,15,22,0.10);
    background: rgba(255,255,255,0.8);
  }

  .mock-screen{
    border-radius: 20px;
    border: 1px solid rgba(11,15,22,0.12);
    position: relative;
    padding: 0px;
    min-height: 340px;
    overflow: hidden;
    box-shadow: var(--shadow-inset);
  }

  .grid-tiles{
    position: absolute;
    inset: 0;
    background-image:
      linear-gradient(to right, rgba(11,15,22,0.05) 1px, transparent 1px),
      linear-gradient(to bottom, rgba(11,15,22,0.05) 1px, transparent 1px);
    background-size: 26px 26px;
    opacity: 0.35;
    pointer-events: none;
  }

  .hud{
    position: relative;
    display: grid;
    gap: 10px;
    z-index: 1;
  }
  .hud-row{
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }

  .card{
    border-radius: 16px;
    border: 1px solid rgba(11,15,22,0.10);
    background: rgba(255,255,255,0.78);
    backdrop-filter: blur(12px) saturate(180%);
    box-shadow: 0 12px 30px rgba(0,0,0,0.10);
    padding: 14px;
  }
  .metric{
    display: grid;
    gap: 6px;
  }
  .metric .label{
    font-size: 12px;
    color: rgba(11,15,22,0.62);
  }
  .metric .value{
    font-weight: 700;
    letter-spacing: -0.02em;
  }
  .metric .hint{
    font-size: 12px;
    color: rgba(11,15,22,0.56);
  }

  .alert{
    display: flex;
    gap: 10px;
    align-items: flex-start;
  }
  .alert .chip{
    width: 34px;
    height: 34px;
    border-radius: 12px;
    background: rgba(0,113,227,0.10);
    border: 1px solid rgba(0,113,227,0.22);
    display: grid;
    place-items: center;
    flex: 0 0 auto;
  }
  .alert .chip svg{ width: 18px; height: 18px; }
  .alert .title{
    font-weight: 650;
    letter-spacing: -0.01em;
    margin-bottom: 2px;
  }
  .alert .desc{
    font-size: 13px;
    color: rgba(11,15,22,0.64);
  }

  /* Sections */
  section{
    padding: 56px 0;
  }
  .section-head{
    display: grid;
    gap: 10px;
    margin-bottom: 22px;
  }
  h2{
    margin: 0;
    font-size: clamp(24px, 2.5vw, 34px);
    letter-spacing: -0.02em;
    line-height: 1.15;
  }
  .section-head p{
    margin: 0;
    color: var(--muted);
    max-width: 72ch;
    font-size: 16px;
  }

  .grid-2{
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 18px;
    align-items: start;
  }
  .grid-3{
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 14px;
  }

  .feature{
    padding: 18px;
    border-radius: var(--radius-md);
    border: 1px solid rgba(11,15,22,0.10);
    background: linear-gradient(180deg, rgba(255,255,255,0.92), rgba(255,255,255,0.72));
    box-shadow: var(--shadow-sm);
    min-height: 120px;
  }
  .feature .icon{
    width: 40px;
    height: 40px;
    border-radius: 14px;
    background: rgba(11,15,22,0.04);
    border: 1px solid rgba(11,15,22,0.08);
    display: grid;
    place-items: center;
    margin-bottom: 12px;
  }
  .feature h3{
    margin: 0 0 6px;
    font-size: 16px;
    letter-spacing: -0.01em;
  }
  .feature p{
    margin: 0;
    color: rgba(11,15,22,0.68);
    font-size: 14px;
  }

  .list{
    margin: 0;
    padding-left: 18px;
    color: rgba(11,15,22,0.72);
  }
  .list li{ margin: 8px 0; }

  /* CTA band */
  .cta{
    border-radius: var(--radius-lg);
    border: 1px solid rgba(11,15,22,0.10);
    background: radial-gradient(110% 160% at 30% 20%, rgba(42,167,255,0.24), rgba(0,113,227,0.10) 55%, rgba(255,255,255,0.75) 100%);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    position: relative;
  }
  .cta-inner{
    padding: 28px;
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 18px;
    align-items: center;
  }
  .cta p{
    margin: 10px 0 0;
    color: rgba(11,15,22,0.70);
    max-width: 70ch;
  }
  .cta-actions{
    display: grid;
    gap: 10px;
    justify-items: start;
  }

  /* FAQ */
  .faq{
    display: grid;
    gap: 10px;
  }
  details{
    border-radius: 16px;
    border: 1px solid rgba(11,15,22,0.10);
    background: rgba(255,255,255,0.82);
    box-shadow: var(--shadow-sm);
    padding: 14px 16px;
  }
  summary{
    cursor: pointer;
    list-style: none;
    font-weight: 650;
    letter-spacing: -0.01em;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
  }
  summary::-webkit-details-marker{ display: none; }
  .chev{
    width: 18px;
    height: 18px;
    transition: transform 220ms var(--ease);
    opacity: 0.75;
    flex: 0 0 auto;
  }
  details[open] .chev{ transform: rotate(180deg); }
  details p{
    margin: 10px 0 0;
    color: rgba(11,15,22,0.70);
  }

  /* Footer */
  footer{
    padding: 34px 0 44px;
    border-top: 1px solid rgba(11,15,22,0.08);
    color: rgba(11,15,22,0.62);
    font-size: 13px;
  }
  .fineprint{
    display: flex;
    flex-wrap: wrap;
    gap: 10px 18px;
    align-items: center;
    justify-content: space-between;
  }
  .fineprint a{
    color: rgba(11,15,22,0.70);
    text-decoration: underline;
    text-decoration-color: rgba(11,15,22,0.18);
  }
  .fineprint a:hover{
    text-decoration-color: rgba(11,15,22,0.32);
  }

  /* Responsive */
  @media (max-width: 980px){
    .hero-grid{ grid-template-columns: 1fr; }
    .mock{ order: 2; }
    .grid-3{ grid-template-columns: 1fr 1fr; }
    .cta-inner{ grid-template-columns: 1fr; }
    .cta-actions{ justify-items: start; }
  }
  @media (max-width: 640px){
    :root{ --pad-x: 18px; }
    .nav-links{ display: none; }
    .grid-2{ grid-template-columns: 1fr; }
    .grid-3{ grid-template-columns: 1fr; }
    .hero{ padding-top: 64px; }
    .mock-screen{ min-height: 300px; }
  }

  @media (prefers-reduced-motion: reduce){
    * { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
  }

  .thumb {
    width: 100%; object-fit: cover; display: block;
    border-radius: 20px;
  }