:root {
  color-scheme: dark;
  --page-bg: #111;
  --text: #f5f5f5;
  --muted: #bdbdbd;
  --gold: #d4af37;
  --panel: #1a1a1a;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background: var(--page-bg);
}

body {
  color: var(--text);
  font-family: Arial, Helvetica, sans-serif;
  overflow-x: hidden;
}

.page-shell {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
}

.app-nav {
  width: 100%;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  grid-template-areas: "previous logo next";
  align-items: center;
  gap: 24px;
  padding: 20px 40px 12px;
}

.app-nav a {
  color: var(--gold);
  text-decoration: none;
  font-size: 18px;
  font-weight: 700;
}

.previous-link {
  grid-area: previous;
  justify-self: start;
}

.logo-link {
  grid-area: logo;
  justify-self: center;
  line-height: 0;
}

.logo-link img {
  display: block;
  width: auto;
  height: 38px;
}

.next-link {
  grid-area: next;
  justify-self: end;
}

.app-main {
  width: min(100%, 1240px);
  margin: 18px auto 0;
  padding: 0 32px;
  flex: 1;
  display: flex;
  align-items: center;
}

.app-grid {
  width: 100%;
  display: grid;
  grid-template-columns: minmax(0, 52%) minmax(0, 48%);
  gap: 36px;
  align-items: center;
}

.hero {
  min-width: 0;
  height: min(56vh, 540px);
  min-height: 420px;
  padding: 14px;
  background: var(--panel);
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.app-copy {
  min-width: 0;
}

.app-copy h1 {
  margin: 0;
  font-size: clamp(40px, 4vw, 52px);
  line-height: 1.05;
}

.app-copy h2 {
  margin: 8px 0 22px;
  color: #fff;
  font-size: clamp(22px, 2vw, 26px);
  line-height: 1.15;
}

.app-copy p {
  margin: 0 0 20px;
  font-size: clamp(18px, 1.65vw, 22px);
  line-height: 1.45;
  white-space: pre-line;
}

.app-copy ul {
  margin: 0;
  padding-left: 1.35em;
}

.app-copy li {
  margin: 4px 0;
  font-size: clamp(17px, 1.5vw, 21px);
  line-height: 1.35;
}

.app-footer {
  text-align: center;
  padding: 30px 20px 34px;
  color: var(--muted);
  font-size: 15px;
}

/* Phones only: logo first, navigation second, image third, copy below. */
@media (max-width: 700px) {
  .app-nav {
    grid-template-columns: 1fr 1fr;
    grid-template-areas:
      "logo logo"
      "previous next";
    row-gap: 18px;
    padding: 22px 24px 8px;
  }

  .logo-link img {
    height: 32px;
  }

  .app-nav a {
    font-size: 16px;
  }

  .app-main {
    display: block;
    margin-top: 16px;
    padding: 0 22px;
  }

  .app-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 26px;
  }

  .hero {
    order: 1;
    width: 100%;
    height: auto;
    min-height: 0;
    aspect-ratio: 4 / 5;
    padding: 10px;
    border-radius: 16px;
  }

  .app-copy {
    order: 2;
  }

  .app-copy h1 {
    font-size: 38px;
    line-height: 1.06;
  }

  .app-copy h2 {
    margin-top: 7px;
    margin-bottom: 18px;
    font-size: 23px;
  }

  .app-copy p {
    font-size: 18px;
    line-height: 1.48;
  }

  .app-copy li {
    font-size: 17px;
    line-height: 1.4;
  }

  .app-footer {
    padding-top: 34px;
    padding-bottom: 28px;
    font-size: 14px;
  }
}

@media (max-width: 390px) {
  .app-main { padding-inline: 18px; }
  .app-copy h1 { font-size: 34px; }
  .app-copy h2 { font-size: 21px; }
}