:root {
    color-scheme: light;
    --white: #FFFFFF;
    --grey: #EFEFEF;
    --ink: #0F1011;
    --blue: #3800F0;
    --muted: #646D76;
    --rule: #0F1011;
    --display: "Poppins", "Helvetica Neue", Arial, sans-serif;
    --body: "Geist", -apple-system, "Segoe UI", Arial, sans-serif;
    --wrap: 1080px;
  }
  * { box-sizing: border-box; }
  body {
    margin: 0;
    background: var(--white);
    color: var(--ink);
    font-family: var(--body);
    font-size: 17px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
  }
  h1, h2, h3, p, ul { margin: 0; }
  ul { padding: 0; list-style: none; }
  a { color: inherit; }
  :focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; }

  .wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: 20px; }
  .display { font-family: var(--display); font-weight: 700; line-height: 1.08; letter-spacing: -0.02em; text-wrap: balance; }

  header.top { padding-block: clamp(24px, 4vw, 40px) 0; }
  .mark { font-family: var(--display); font-weight: 700; font-size: 1.1rem; letter-spacing: -0.01em; }
  .mark span { color: var(--blue); }

  .hero { padding-block: clamp(32px, 5vw, 56px) clamp(40px, 6vw, 64px); }
  .kicker { font-size: 0.9rem; color: var(--muted); }
  h1 { font-size: clamp(2.1rem, 5.2vw, 3.6rem); margin-top: 14px; max-width: 18ch; }
  h1 em { font-style: normal; color: var(--blue); }
  .sub { font-size: clamp(1.05rem, 1.7vw, 1.25rem); margin-top: 20px; max-width: 62ch; }
  .intro { margin-top: 20px; max-width: 68ch; color: var(--muted); font-size: 1.02rem; }
  .prompt { margin-top: 28px; font-family: var(--display); font-weight: 600; font-size: clamp(1.1rem, 2vw, 1.3rem); }

  .doors { margin-top: clamp(28px, 5vw, 48px); padding-bottom: clamp(48px, 7vw, 88px); display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
  .door {
    display: flex; flex-direction: column; gap: 14px;
    background: var(--grey); border-bottom: 3px solid var(--blue);
    padding: clamp(24px, 3.5vw, 34px);
  }
  .door .n { font-family: var(--display); font-weight: 700; font-size: 0.8rem; color: var(--blue); letter-spacing: 0.08em; text-transform: uppercase; }
  .door h2 { font-family: var(--display); font-weight: 700; font-size: clamp(1.15rem, 2.2vw, 1.4rem); letter-spacing: -0.01em; line-height: 1.28; }
  .door p { font-size: 0.95rem; color: var(--muted); }
  .door .btn { margin-top: auto; align-self: flex-start; }

  .btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 10px;
    padding: 14px 22px; font: 500 0.95rem/1 var(--body); text-decoration: none;
    border: 2px solid var(--ink); border-radius: 0;
    background: var(--ink); color: var(--white);
    transition: background .15s ease, border-color .15s ease;
  }
  .btn svg { width: 16px; height: 16px; flex: none; }
  .btn:hover { background: var(--blue); border-color: var(--blue); }

  footer { padding-block: 28px; border-top: 2px solid var(--ink); }
  footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px; font-size: 0.85rem; color: var(--muted); }

  @media (max-width: 780px) {
    .doors { grid-template-columns: 1fr; }
  }