[hidden] { display: none !important; }
.book-shell { width: min(1080px, calc(100% - 48px)); display: grid; grid-template-columns: .8fr 1.2fr; gap: 56px; align-items: start; margin: 0 auto; padding: 64px 0 100px; }
.book-intro { padding-top: 18px; }
.book-intro h1 { margin: 22px 0 14px; font-size: clamp(40px, 5vw, 60px); }
.book-intro p { max-width: 460px; color: #615b65; font-size: 16px; line-height: 1.7; }
.book-meta { list-style: none; margin: 28px 0 0; padding: 0; border-top: 1px solid var(--line); }
.book-meta li { padding: 14px 0; border-bottom: 1px solid var(--line); color: #4b4550; font-size: 13px; font-weight: 650; }
.book-card { padding: 34px; border: 1px solid var(--line); border-radius: 26px; background: white; box-shadow: var(--shadow); min-height: 320px; }
.book-card h2 { margin: 0 0 20px; font-size: 32px; }
.book-note { color: #6b6570; font-size: 13px; line-height: 1.6; }
.book-summary { margin: 0 0 18px; padding: 14px 16px; border-left: 3px solid var(--coral); background: #fff7e8; font-size: 14px; font-weight: 700; line-height: 1.5; }
.book-error { margin: 12px 0; padding: 10px 12px; border-radius: 8px; color: #8a1f12; background: #fde8e4; font-size: 13px; }
.day-list { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.day-list button, .slot-list button { padding: 10px 14px; border: 1px solid var(--line); border-radius: 12px; background: #fffaf3; color: var(--ink); font-weight: 700; font-size: 13px; cursor: pointer; }
.day-list button[aria-pressed="true"] { border-color: var(--violet); background: #f1ecff; box-shadow: 0 0 0 2px rgba(67,52,112,.1); }
.slot-heading { margin: 0 0 10px; font-size: 14px; color: #5e5862; }
.slot-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(96px, 1fr)); gap: 8px; }
.slot-list button { text-align: center; }
.slot-list button:hover, .day-list button:hover { border-color: var(--coral); }
.book-button { display: inline-block; margin-top: 14px; padding: 14px 22px; border: 0; border-radius: 999px; background: var(--ink); color: white; font-weight: 800; font-size: 14px; cursor: pointer; text-align: center; }
.book-button[disabled] { opacity: .6; cursor: progress; }
.book-link { display: inline-block; margin-top: 10px; padding: 6px 0; border: 0; background: none; color: var(--violet); font-weight: 700; font-size: 13px; text-decoration: underline; cursor: pointer; }
#manage-actions { display: flex; flex-direction: column; align-items: flex-start; gap: 6px; }
@media (max-width: 900px) { .book-shell { grid-template-columns: 1fr; gap: 28px; } }
@media (max-width: 620px) { .book-shell { width: min(100% - 32px, 1080px); padding: 32px 0 64px; } .book-card { padding: 22px 16px; } .book-card h2 { font-size: 26px; } }