:root {
  --paper: #effbdd;
  --mint: #90e8b0;
  --leaf: #6e9b5a;
  --leaf-dark: #365a35;
  --ink: #29472c;
  --sun: #ffe68a;
  --shadow: rgba(46, 91, 48, 0.42);
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 5%, rgba(255, 255, 255, 0.5) 0 2px, transparent 3px),
    linear-gradient(135deg, #b6f3c4 0%, var(--mint) 48%, #7bdca0 100%);
  background-size: 29px 29px, auto;
  font-family: "Comic Sans MS", "Chalkboard SE", cursive;
  line-height: 1.45;
}

a {
  color: var(--leaf-dark);
  font-weight: bold;
  text-decoration-color: #7cae69;
  text-decoration-thickness: 2px;
  text-underline-offset: 2px;
}

a:focus-visible {
  outline: 3px solid var(--sun);
  outline-offset: 3px;
}

h1,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0.35rem;
  font-size: clamp(1.65rem, 3vw, 2.25rem);
  line-height: 1.1;
}

.computer-only {
  display: none;
}

.chatbook-shell {
  width: min(1120px, calc(100% - 3rem));
  margin: 1.5rem auto 2.5rem;
}

.chatbook-window {
  overflow: hidden;
  border: 2px solid var(--leaf-dark);
  border-radius: 10px;
  background: linear-gradient(145deg, rgba(248, 255, 235, 0.97), rgba(221, 244, 201, 0.97));
  box-shadow: 5px 5px 0 var(--shadow), 0 12px 25px rgba(53, 99, 55, 0.12);
}

.intro-window {
  margin-bottom: 1.1rem;
}

.title-bar {
  display: flex;
  align-items: center;
  min-height: 34px;
  padding: 6px 10px;
  color: #fff;
  background: linear-gradient(90deg, #638e54, #82ae69 72%, #6d9b59);
  font-weight: bold;
  letter-spacing: 0.02em;
  text-shadow: 1px 1px 0 rgba(35, 73, 38, 0.4);
}

.right {
  display: inline-grid;
  width: 18px;
  height: 18px;
  margin-left: auto;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.65);
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.12);
  font-family: Arial, sans-serif;
  font-size: 12px;
  line-height: 1;
}

.window-inner {
  padding: 1rem 1.25rem;
}

.chatbook-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.chatbook-heading p:last-child {
  margin-bottom: 0;
}

.eyebrow {
  margin-bottom: 0.25rem;
  color: #507d48;
  font-size: 0.77rem;
  font-weight: bold;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.home-link {
  flex: 0 0 auto;
  padding: 0.45rem 0.75rem;
  border: 1px solid #74a160;
  border-radius: 999px;
  background: #effbde;
  box-shadow: 2px 2px 0 rgba(71, 119, 65, 0.2);
  text-decoration: none;
}

.home-link:hover {
  transform: translate(-1px, -1px);
  background: #fff7c5;
}

.chat-frame {
  height: min(62vh, 620px);
  min-height: 420px;
}

.chat-frame iframe {
  display: block;
  width: 100%;
  height: calc(100% - 34px);
  border: 0;
  background: #fff;
}

@media (max-width: 900px) {
  .chatbook-shell {
    display: none;
  }

  .computer-only {
    display: grid;
    min-height: 100vh;
    padding: 1.25rem;
    place-items: center;
  }

  .computer-only-card {
    width: min(430px, 100%);
    padding: 1.4rem;
    border: 2px solid var(--leaf-dark);
    border-radius: 10px;
    background: linear-gradient(145deg, #f8ffeb, #d9f3c6);
    box-shadow: 6px 6px 0 var(--shadow);
    text-align: center;
  }

  .computer-only-card p:last-child {
    margin-bottom: 1rem;
  }
}