:root {
  --ink: #2a2418;
  --ink-soft: rgba(42, 36, 24, 0.7);
  --paper: #f3e6c4;
  --paper-deep: #e8d4a0;
  --wall: #c9a84c;
  --accent: #5c4a28;
  --line: rgba(42, 36, 24, 0.14);
  --font-display: "Instrument Serif", "Songti SC", serif;
  --font-ui: "Sora", "PingFang SC", "Hiragino Sans GB", sans-serif;
}

*,
*::before,
*::after { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(ellipse 90% 60% at 50% -10%, rgba(255, 244, 200, 0.55), transparent 55%),
    linear-gradient(165deg, #d4b45c 0%, #b8923a 48%, #9a7830 100%);
  color: var(--ink);
  font-family: var(--font-ui);
  -webkit-font-smoothing: antialiased;
}

.sheet {
  width: min(36rem, calc(100% - 2rem));
  margin: 1.5rem auto 3rem;
  padding: 1.75rem 1.4rem 2.2rem;
  background: linear-gradient(180deg, #f7edd2 0%, var(--paper) 40%, var(--paper-deep) 100%);
  border-radius: 2px;
  box-shadow: 0 18px 50px rgba(60, 40, 10, 0.22);
}

.brand {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.65rem;
  font-weight: 400;
  letter-spacing: 0.02em;
}

.hero h1,
.thanks h1 {
  margin: 0.35rem 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.85rem;
  font-weight: 400;
}

.lede {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
  line-height: 1.55;
}

.back {
  margin: 1rem 0 0;
  font-size: 0.88rem;
}

.back a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(92, 74, 40, 0.35);
}

.form { margin-top: 1.6rem; }

.hp { position: absolute; left: -9999px; height: 0; overflow: hidden; }

.block h2 {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
}

.hint {
  margin: 0.25rem 0 1rem;
  font-size: 0.8rem;
  color: var(--ink-soft);
}

fieldset {
  margin: 0 0 1.25rem;
  padding: 0;
  border: none;
}

legend,
.field > span {
  display: block;
  margin-bottom: 0.55rem;
  font-size: 0.92rem;
  font-weight: 500;
}

.opt {
  display: flex;
  align-items: flex-start;
  gap: 0.55rem;
  margin: 0.35rem 0;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--line);
  background: rgba(255, 252, 240, 0.55);
  font-size: 0.9rem;
  line-height: 1.4;
  cursor: pointer;
}

.opt:has(input:checked) {
  border-color: rgba(92, 74, 40, 0.45);
  background: rgba(255, 248, 220, 0.95);
}

.opt input { margin-top: 0.15rem; accent-color: var(--accent); }

.field { display: block; margin-bottom: 1.2rem; }

.field input[type="text"],
.field textarea {
  width: 100%;
  padding: 0.7rem 0.8rem;
  border: 1px solid var(--line);
  background: rgba(255, 252, 240, 0.7);
  color: var(--ink);
  font: inherit;
  font-size: 0.9rem;
  resize: vertical;
}

.field input:focus,
.field textarea:focus {
  outline: 2px solid rgba(92, 74, 40, 0.35);
  outline-offset: 1px;
}

.scale {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.2rem;
  font-size: 0.75rem;
  color: var(--ink-soft);
}

.scale label { display: flex; justify-content: center; flex: 1; }
.scale input { accent-color: var(--accent); }
.scale-note { margin: 0.4rem 0 0; font-size: 0.75rem; color: var(--ink-soft); }

.deeper {
  margin: 0.5rem 0 1.4rem;
  padding: 0.9rem 0.85rem;
  border: 1px dashed rgba(42, 36, 24, 0.22);
  background: rgba(255, 250, 235, 0.4);
}

.deeper summary {
  cursor: pointer;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--accent);
  list-style: none;
}

.deeper summary::-webkit-details-marker { display: none; }
.deeper[open] summary { margin-bottom: 1rem; }

.submit {
  display: block;
  width: 100%;
  margin-top: 0.4rem;
  padding: 0.85rem 1rem;
  border: none;
  background: var(--ink);
  color: #f6ecd0;
  font: inherit;
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  cursor: pointer;
}

.submit:hover { background: #1c1810; }

.foot {
  margin: 0.9rem 0 0;
  font-size: 0.75rem;
  color: var(--ink-soft);
  line-height: 1.45;
  text-align: center;
}

.thanks {
  margin-top: 18vh;
  text-align: center;
  padding-bottom: 2.5rem;
}

.thanks .back { margin-top: 1.5rem; }

@media (max-width: 480px) {
  .sheet { margin: 0.75rem auto 2rem; padding: 1.35rem 1.1rem 1.8rem; }
  .hero h1 { font-size: 1.6rem; }
}