:root {
  --navy: #0F172A;
  --text: #1A1F2C;
  --muted: #5C6570;
  --faint: #8B939E;
  --line: #E6E4DE;
  --paper: #F4F2EC;
  --white: #fff;
  --fill: #0F172A;
  --ease: 160ms ease;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--paper);
  font-size: 16px;
  line-height: 1.6;
  letter-spacing: 0.01em;
}
.progress {
  position: sticky;
  top: 0;
  z-index: 10;
  height: 3px;
  background: #D8D5CC;
}
.progress-fill {
  height: 100%;
  width: 0;
  background: var(--fill);
  transition: width 180ms ease;
}
.page {
  width: min(520px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 48px;
  min-height: calc(100vh - 3px);
}
.screen h1 {
  margin: 36px 0 18px;
  font-size: 26px;
  font-weight: 500;
  line-height: 1.32;
  color: var(--navy);
  letter-spacing: 0.02em;
}
.lead {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 15px;
}
.privacy {
  margin: 28px 0 0;
  color: var(--faint);
  font-size: 12px;
  line-height: 1.55;
}
.primary,
.ghost,
.choice {
  appearance: none;
  font-family: inherit;
  cursor: pointer;
}
.primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 28px;
  min-height: 48px;
  min-width: 132px;
  padding: 12px 22px;
  border: 1px solid var(--navy);
  background: var(--navy);
  color: var(--paper);
  font-size: 15px;
  letter-spacing: 0.04em;
}
.primary:hover { background: #1a2540; }
.primary:disabled { opacity: 0.45; cursor: default; }
.primary:focus-visible,
.ghost:focus-visible,
.choice:focus-visible,
.slider:focus-visible,
.area:focus-visible {
  outline: 1px solid var(--navy);
  outline-offset: 3px;
}
.prompt {
  margin: 8px 0 20px;
  color: var(--navy);
  font-size: 18px;
  font-weight: 500;
  line-height: 1.55;
  white-space: pre-line;
}
.choices { display: grid; gap: 10px; }
.choice {
  display: block;
  width: 100%;
  text-align: left;
  min-height: 48px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--text);
  font-size: 15px;
  line-height: 1.5;
}
.choice:hover { border-color: #C9C6BD; }
.choice.is-on {
  border-color: var(--navy);
  color: var(--navy);
}
.slider-wrap { display: grid; gap: 14px; }
.slider-value {
  font-size: 32px;
  font-weight: 500;
  color: var(--navy);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}
.slider {
  width: 100%;
  height: 36px;
  margin: 0;
  accent-color: var(--navy);
}
.area {
  display: block;
  width: 100%;
  min-height: 140px;
  padding: 12px;
  border: 1px solid var(--line);
  background: var(--white);
  color: var(--navy);
  font: inherit;
  resize: vertical;
}
.area:focus { border-color: var(--navy); outline: none; }

@media (min-width: 900px) {
  .page { padding-top: 48px; }
  .screen h1 { font-size: 32px; margin-top: 56px; }
  .prompt { font-size: 20px; }
}

@media (max-width: 420px) {
  .page { width: calc(100% - 28px); padding-top: 20px; }
  .screen h1 { font-size: 24px; margin-top: 20px; }
  .prompt { font-size: 17px; }
}