.survey-book { width: min(760px, calc(100% - 32px)); }
.book { margin-top: 18px; max-width: 420px; margin-left: auto; margin-right: auto; }
.book-cal {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface);
}
.book-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.book-month { margin: 0; font-family: var(--serif); font-size: 22px; text-align: center; flex: 1; }
.book-nav {
  width: 40px;
  height: 40px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
}
.book-nav:disabled { opacity: 0.35; cursor: default; }
.book-week, .book-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; }
.book-week { margin: 12px 0 6px; }
.book-week span { text-align: center; font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--ink-soft); }
.book-day {
  aspect-ratio: 1;
  border: 0;
  border-radius: 12px;
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.book-day.is-out { visibility: hidden; }
.book-day.is-off { color: var(--ink-soft); opacity: 0.35; cursor: default; }
.book-day:not(.is-off):hover { background: var(--line); }
.book-day.is-on, .hour.is-on { background: var(--spruce); color: #f6f1e8; }
.book-times { margin-top: 16px; }
.book-time-label { margin: 12px 0 8px; font-size: 12px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--spruce); font-weight: 600; text-align: center; }
.hour-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }
.hour {
  width: 76px;
  min-height: 44px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.hour:hover { border-color: var(--spruce); }
@media (min-width: 900px) {
  .survey-book .book:has(.book-times:not([hidden])) {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px;
    align-items: start;
    max-width: none;
  }
  .survey-book .book:has(.book-times:not([hidden])) .book-times { margin-top: 0; }
}
[data-theme="dark"] .book-cal,
[data-theme="dark"] .hour { background: #241f1b; }
[data-theme="dark"] .book-day.is-on,
[data-theme="dark"] .hour.is-on { background: #2f6b56; color: #f6f1e8; }