:root {
  --ink: #103538;
  --green: #2d746d;
  --paper: #f7f4ec;
  --mint: #dcede7;
  --gold: #eab66b;
  --line: #cad8d4;
  --white: #fff;
  --muted: #506669;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Arial, sans-serif;
  line-height: 1.58;
}

button, textarea, input { font: inherit; }

.intro {
  width: min(1040px, calc(100% - 40px));
  margin: 0 auto;
  padding: 68px 0 58px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--green);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .13em;
  text-transform: uppercase;
}

h1, h2 {
  margin: 0;
  font-family: Georgia, serif;
  letter-spacing: -.03em;
  line-height: 1.08;
}

h1 {
  max-width: 950px;
  font-size: clamp(42px, 7vw, 72px);
}

h2 { font-size: clamp(28px, 4vw, 44px); }

.subtitle {
  margin: 18px 0 0;
  color: var(--green);
  font-size: 20px;
  font-weight: 700;
}

.lead {
  max-width: 820px;
  margin: 24px 0 34px;
  color: #365155;
  font-family: Georgia, serif;
  font-size: 20px;
}

.instructions {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 38px;
  align-items: start;
  margin: 0 0 28px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--mint);
}

.instructions h2 { font-size: 30px; }

.instructions ol {
  margin: 0;
  padding-left: 24px;
  color: var(--muted);
}

.instructions li + li { margin-top: 9px; }

.open-book {
  display: inline-block;
  padding: 14px 20px;
  border-radius: 9px;
  background: var(--ink);
  color: var(--white);
  font-weight: 800;
  text-decoration: none;
}

.viewer {
  height: min(90vh, 1050px);
  padding: 18px;
  background: #cfd8d5;
}

.viewer object {
  display: block;
  width: min(1180px, 100%);
  height: 100%;
  margin: 0 auto;
  border: 0;
  background: var(--white);
  box-shadow: 0 12px 36px rgba(16, 53, 56, .18);
}

.feedback {
  padding: 82px 20px 105px;
  background: var(--ink);
  color: var(--white);
}

.feedback-inner {
  width: min(860px, 100%);
  margin: 0 auto;
}

.feedback .eyebrow { color: #a6d1c3; }
.feedback h2 { max-width: 740px; }
.feedback-inner > p:not(.eyebrow) { color: #c9d8d6; }

#feedback-form { margin-top: 34px; }

#feedback-form fieldset {
  margin: 0;
  padding: 0;
  border: 0;
}

#feedback-form legend {
  margin-bottom: 14px;
  font-weight: 800;
}

#feedback-form fieldset label {
  display: block;
  margin-bottom: 10px;
}

#feedback-form input[type="radio"] {
  position: absolute;
  opacity: 0;
}

#feedback-form input[type="radio"] + span {
  display: block;
  padding: 13px 16px;
  border: 1px solid rgba(255, 255, 255, .28);
  border-radius: 9px;
  cursor: pointer;
}

#feedback-form input[type="radio"]:checked + span {
  border-color: var(--gold);
  background: var(--gold);
  color: var(--ink);
  font-weight: 800;
}

.comment-label {
  display: block;
  margin-top: 28px;
}

.comment-label > span {
  display: block;
  font-weight: 800;
}

.comment-label small {
  display: block;
  margin: 4px 0 10px;
  color: #c9d8d6;
}

textarea {
  width: 100%;
  min-height: 220px;
  padding: 14px;
  border: 2px solid transparent;
  border-radius: 9px;
  resize: vertical;
}

textarea:focus {
  border-color: var(--gold);
  outline: 0;
}

#feedback-form button {
  margin-top: 18px;
  padding: 13px 19px;
  border: 0;
  border-radius: 9px;
  background: var(--gold);
  color: var(--ink);
  cursor: pointer;
  font-weight: 800;
}

#feedback-form button:disabled { opacity: .55; }
.error { color: #ffd2c7; font-weight: 700; }
.saved { color: #c7efdc; font-weight: 800; }

@media (max-width: 720px) {
  .intro { width: min(100% - 28px, 1040px); padding-top: 42px; }
  .instructions { grid-template-columns: 1fr; gap: 22px; padding: 21px; }
  .viewer { height: 76vh; padding: 8px; }
  .feedback { padding: 58px 18px 76px; }
}