@keyframes subject-picker-open{0%{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:translateY(0)}}[data-top-tabs]{gap:.625rem;padding:0 .5rem;background:0 0;min-height:2.75rem;position:relative;z-index:1}[data-top-tabs]::after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:var(--book-rule, #ececec);pointer-events:none;z-index:0}[data-top-tabs] .subject-picker__delta{flex:0 0 auto;display:inline-flex;align-items:center;color:currentColor}[data-top-tabs] svg{width:18px;height:18px}[data-top-tabs],[data-top-tabs] .top-bar__tabs{display:flex;flex-direction:row;align-items:center}[data-top-tabs] .top-bar__tabs{gap:2px;flex:1 1 auto;min-width:0;overflow:visible}[data-top-tabs] .top-bar__user{flex:0 0 auto;margin-left:auto;display:inline-flex;align-items:center}[data-top-tabs] .top-tab{display:inline-flex;align-items:center;width:auto;height:2rem;background:0 0;box-shadow:none;border-radius:6px;padding:0 .75rem;position:relative;color:var(--book-text-secondary, #78716c);text-decoration:none;font-family:var(--book-font-sans, system-ui, -apple-system, sans-serif);font-size:.875rem;font-weight:500;transition:color .15s,background-color .12s;cursor:pointer;white-space:nowrap}[data-top-tabs] .top-tab.is-active,[data-top-tabs] .top-tab:focus-visible,[data-top-tabs] .top-tab:hover{color:var(--book-text-primary, #1c1917)}[data-top-tabs] .top-tab__label{display:inline-block;position:relative;font-weight:500;transition:font-weight .15s}[data-top-tabs] .top-tab__label::after{content:attr(data-label);display:block;height:0;visibility:hidden;overflow:hidden;font-weight:700;pointer-events:none;user-select:none}[data-top-tabs] .top-tab.is-active .top-tab__label{font-weight:700}[data-top-tabs] .top-tab::after{content:none!important}[data-top-tabs] .top-tab.is-active::before{content:"";position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--book-text-primary, #1c1917);pointer-events:none}[data-top-tabs] .top-tab--subject-picker{padding:0}[data-top-tabs] .top-tab--subject-picker .subject-picker__button{height:100%;padding:0 .75rem;margin:0;font-family:var(--book-font-serif, Georgia, serif);font-size:.95rem;font-weight:700;color:inherit;border-radius:6px}[data-top-tabs] .top-tab--subject-picker.is-active .subject-picker__button{color:var(--book-text-primary, #1c1917)}[data-top-tabs] .top-tab--subject-picker .subject-picker__arrow{font-size:.7em}[data-top-tabs] .top-tab--subject-picker-link{gap:.5rem;font-family:var(--book-font-serif, Georgia, serif);font-size:.95rem;font-weight:700}[data-top-tabs] .top-tab--subject-picker-link .top-tab__label{font-weight:700}[data-top-tabs] .top-tab--subject-picker-link .subject-picker__arrow{font-size:.7em}.subject-picker__host{position:relative;display:inline-flex;align-items:center}.subject-picker__button{display:inline-flex;align-items:center;gap:.5rem;background:0 0;border:0;padding:.35rem .6rem;margin:-.35rem -.6rem;font:inherit;color:inherit;cursor:pointer;border-radius:6px;text-align:left;transition:background-color .15s}.subject-picker__button:focus-visible,.subject-picker__button:hover{background:rgba(0,0,0,.05);outline:0}.subject-picker__arrow{font-size:.65em;color:var(--book-text-secondary, #78716c);transition:transform .15s}.subject-picker__button[aria-expanded=true] .subject-picker__arrow{transform:rotate(180deg)}.subject-picker__panel{position:absolute;top:calc(100% + 6px);left:0;z-index:50;background:#fff;border:1px solid var(--book-border, #e7e5e4);border-radius:12px;box-shadow:0 12px 32px rgba(0,0,0,.14),0 2px 6px rgba(0,0,0,.06);padding:.75rem;display:grid;grid-template-columns:repeat(4,1fr);gap:.5rem}.subject-picker__panel:not([hidden]){animation:subject-picker-open .18s ease-out}.subject-picker__option{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.35rem;background:0 0;border:0;padding:.5rem .25rem;font:inherit;font-size:.78rem;font-weight:500;color:var(--book-text-primary, #1c1917);text-align:center;cursor:pointer;border-radius:10px;transition:background-color .12s,transform .15s;line-height:1.15}.subject-picker__option:focus-visible,.subject-picker__option:hover{background:rgba(0,0,0,.05);transform:translateY(-2px);outline:0}.subject-picker__option.is-current{background:rgba(0,0,0,.06);font-weight:700;box-shadow:inset 0 0 0 2px rgba(0,0,0,.12)}.subject-picker__option-icon{flex-shrink:0;display:inline-flex;align-items:center;justify-content:center}.subject-picker__option-icon .book-icon-shell{width:48px;height:48px;border-radius:999px;background:#2c2a28;display:inline-flex;align-items:center;justify-content:center;margin:0;transition:none}.subject-access-dialog__item-icon .book-icon-shell::after,.subject-picker__option-icon .book-icon-shell::after{display:none}.subject-picker__option-icon .book-icon{width:30px;height:30px;stroke-width:6;filter:none;transition:none}.subject-access-dialog__item-icon .book-icon text,.subject-picker__option-icon .book-icon text{filter:none;font-size:42px}.subject-picker__option-label{text-align:center;white-space:nowrap}.subject-access-overlay{position:fixed;inset:0;background:rgba(0,0,0,.45);display:flex;align-items:center;justify-content:center;z-index:1000;padding:1rem}.subject-access-dialog{background:#fff;border-radius:8px;padding:1.5rem;max-width:28rem;width:100%;max-height:90vh;overflow-y:auto;font-family:var(--book-font-sans, system-ui, sans-serif);box-shadow:0 16px 48px rgba(0,0,0,.25)}.subject-access-dialog__title{margin:0 0 .5rem;font-size:1.25rem}.subject-access-dialog__intro{margin:0 0 1rem;font-size:.9rem;color:var(--book-text-secondary, #78716c)}.subject-access-dialog__list{display:grid;grid-template-columns:repeat(2,1fr);gap:.5rem 1rem;margin-bottom:1rem}.subject-access-dialog__item{display:flex;flex-direction:row;align-items:center;gap:.6rem;font-size:.95rem;cursor:pointer;padding:.4rem .5rem;border-radius:8px;transition:background-color .12s}.subject-access-dialog__item:hover{background:rgba(0,0,0,.04)}.subject-access-dialog__item input{cursor:pointer;flex-shrink:0}.subject-access-dialog__item-icon{flex-shrink:0;display:inline-flex}.subject-access-dialog__item-icon .book-icon-shell{width:28px;height:28px;border-radius:999px;background:#2c2a28;display:inline-flex;align-items:center;justify-content:center;margin:0;transition:none}.subject-access-dialog__item-icon .book-icon{width:18px;height:18px;stroke-width:6;filter:none;transition:none}.subject-access-dialog__item-label{flex:1;min-width:0}.subject-access-dialog__actions{display:flex;align-items:center;justify-content:flex-end;gap:.5rem;margin-top:.5rem;border-top:1px solid var(--book-border, #e7e5e4);padding-top:1rem}.subject-access-dialog__status{margin-right:auto;font-size:.85rem;color:var(--book-text-secondary, #78716c)}.subject-access-dialog__btn{background:#fff;border:1px solid var(--book-border, #d6d3d1);border-radius:6px;padding:.5rem 1rem;font:inherit;font-size:.9rem;cursor:pointer}.subject-access-dialog__btn:hover:not(:disabled){background:#f5f5f4}.subject-access-dialog__btn:disabled{opacity:.6;cursor:not-allowed}.subject-access-dialog__btn--primary{background:#1c1917;color:#fff;border-color:#1c1917}.subject-access-dialog__btn--primary:hover:not(:disabled){background:#44403c}