:root{
    --paper:#FFFFFF;
    --ink:#111111;
    --steel:#6B6B6B;
    --line:#D9D9D9;
    --accent:#111111;
    --accent-soft:#F0F0F0;
    --card:#FFFFFF;
  }
  @media (prefers-color-scheme: dark){
    :root:not([data-theme="light"]){
      --paper:#0D0D0D;
      --ink:#F5F5F5;
      --steel:#9A9A9A;
      --line:#2E2E2E;
      --accent:#F5F5F5;
      --accent-soft:#1C1C1C;
      --card:#161616;
    }
  }
  :root[data-theme="dark"]{
    --paper:#0D0D0D;
    --ink:#F5F5F5;
    --steel:#9A9A9A;
    --line:#2E2E2E;
    --accent:#F5F5F5;
    --accent-soft:#1C1C1C;
    --card:#161616;
  }

  *{box-sizing:border-box; margin:0; padding:0;}
  html{background:var(--paper);}
  body{
    background:var(--paper);
    color:var(--ink);
    font-family:'Source Sans 3', system-ui, -apple-system, sans-serif;
    font-size:17px;
    line-height:1.6;
    -webkit-font-smoothing:antialiased;
  }
  h1,h2,h3{
    font-family:'Archivo', system-ui, sans-serif;
    font-weight:700;
    letter-spacing:-0.01em;
    line-height:1.08;
  }
  a{color:inherit;}
  .wrap{
    max-width:1040px;
    margin:0 auto;
    padding:0 28px;
  }

  /* NAV */
  nav{
    display:flex;
    align-items:center;
    justify-content:space-between;
    padding:28px 0 0;
  }
  .logo{
    font-family:'Archivo', sans-serif;
    font-weight:700;
    font-size:19px;
    display:flex;
    align-items:center;
    gap:8px;
  }
  .logo-mark{
    width:9px; height:9px;
    background:var(--accent);
    display:inline-block;
    border-radius:1px;
    transform:rotate(45deg);
  }

  /* HERO */
  .hero{
    padding:90px 0 70px;
    display:grid;
    grid-template-columns:1.05fr 0.95fr;
    gap:56px;
    align-items:center;
  }
  .hero h1{
    font-size:clamp(34px, 4.6vw, 54px);
    max-width:11.5ch;
  }
  .hero p.lede{
    margin-top:22px;
    font-size:18px;
    color:var(--steel);
    max-width:42ch;
  }

  .signup{
    margin-top:34px;
    display:flex;
    gap:10px;
    max-width:420px;
  }
  .signup input{
    flex:1;
    padding:13px 16px;
    border:1px solid var(--line);
    background:var(--card);
    color:var(--ink);
    border-radius:3px;
    font-size:15px;
    font-family:inherit;
  }
  .signup input:focus{
    outline:none;
    border-color:var(--accent);
  }
  .signup button{
    padding:13px 20px;
    background:var(--ink);
    color:var(--paper);
    border:none;
    border-radius:3px;
    font-size:15px;
    font-weight:600;
    font-family:'Source Sans 3', sans-serif;
    cursor:pointer;
    white-space:nowrap;
  }
  .signup button:hover{background:var(--accent);}
  .signup button:focus-visible, .signup input:focus-visible{
    outline:2px solid var(--accent);
    outline-offset:2px;
  }
  .fineprint{
    margin-top:12px;
    font-size:13px;
    color:var(--steel);
  }
  .form-note{
    margin-top:14px;
    font-size:14px;
    color:var(--accent);
    display:none;
  }
  #formError{color:var(--ink); text-decoration:underline; text-underline-offset:3px;}

  /* HERO CARD MOCKUP */
  .card-mock{
    background:var(--card);
    border:1px solid var(--line);
    border-radius:6px;
    padding:22px;
    box-shadow:0 1px 0 var(--line);
  }
  .card-mock .thumb{
    aspect-ratio:4/3;
    border-radius:4px;
    background:
      linear-gradient(135deg, var(--accent-soft), transparent 60%),
      repeating-linear-gradient(45deg, var(--line) 0 1px, transparent 1px 14px);
    position:relative;
    overflow:hidden;
  }
  .card-mock .thumb svg{position:absolute; bottom:14px; right:14px; width:64px; height:64px; opacity:.85;}
  .card-row{
    display:flex;
    justify-content:space-between;
    align-items:flex-start;
    margin-top:16px;
  }
  .card-mock h3{font-size:18px;}
  .card-mock .price{
    font-family:'Archivo', sans-serif;
    font-weight:700;
    font-size:17px;
    color:var(--accent);
    white-space:nowrap;
  }
  .card-mock .meta{
    margin-top:4px;
    font-size:14px;
    color:var(--steel);
  }
  .avail{
    margin-top:16px;
    padding-top:16px;
    border-top:1px solid var(--line);
    display:flex;
    justify-content:space-between;
    font-size:13.5px;
    color:var(--steel);
  }
  .avail strong{color:var(--ink); font-weight:600;}

  /* SECTIONS */
  section{padding:64px 0;}
  .divider{border-top:1px solid var(--line);}

  .section-head{
    display:flex;
    gap:16px;
    flex-direction: column;
    margin-bottom:44px;
  }
  .section-head h2{font-size:clamp(24px,3vw,32px); max-width:14ch;}
  .section-head p{color:var(--steel);}

  .steps{
    display:grid;
    grid-template-columns:repeat(3, 1fr);
    gap:36px;
  }
  .step .num{
    font-family:'Archivo', sans-serif;
    font-weight:700;
    font-size:14px;
    color:var(--accent);
    margin-bottom:14px;
  }
  .step h3{font-size:19px; margin-bottom:8px;}
  .step p{color:var(--steel); font-size:15.5px;}

  .why{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:0;
    border:1px solid var(--line);
    border-radius:6px;
    overflow:hidden;
  }
  .why > div{padding:32px 30px;}
  .why > div:first-child{border-right:1px solid var(--line); background:var(--card);}
  .why h3{font-size:18px; margin-bottom:10px;}
  .why p{color:var(--steel); font-size:15px;}
  .why .tag{
    display:inline-block;
    font-size:12.5px;
    color:var(--accent);
    font-weight:600;
    margin-bottom:10px;
  }

  footer{
    padding:40px 0 60px;
    display:flex;
    justify-content:space-between;
    align-items:center;
    color:var(--steel);
    font-size:13.5px;
  }

  @media (max-width:760px){
    .hero{grid-template-columns:1fr; padding-top:52px;}
    .hero .card-mock{order:-1;}
    .signup{flex-direction:column; max-width:100%;}
    .section-head{grid-template-columns:1fr;}
    .steps{grid-template-columns:1fr; gap:28px;}
    .why{grid-template-columns:1fr;}
    .why > div:first-child{border-right:none; border-bottom:1px solid var(--line);}
    footer{flex-direction:column; gap:10px; text-align:center;}
  }