/* Navigation shared by the adopted reader and its independent preview. */
.ct-site-header {
    position: relative;
    z-index: 40;
}
.ct-site-header .ct-header-inner {
    position: relative;
    gap: 28px;
}
.ct-site-header .ct-reader-desktop-nav {
    display: flex;
    align-items: center;
    gap: 22px;
    font-size: 13px;
    white-space: nowrap;
}
.ct-reader-nav-unavailable {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    color: #776b86;
    white-space: nowrap;
}
.ct-reader-nav-unavailable small {
    padding: 1px 5px;
    border-radius: 4px;
    background: #f2edf7;
    color: #79618f;
    font-size: 9px;
    font-weight: 600;
    line-height: 1.7;
}
.ct-reader-menu {
    display: none;
}
.ct-reader-back {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 40px;
    width: 40px;
    height: 40px;
    border: 1px solid #e4daef;
    border-radius: 10px;
    background: #f8f4fd;
    color: #785595;
    text-decoration: none;
    transition: background .15s, border-color .15s;
}
.ct-reader-back:hover { background: #eee5f7; border-color: #c9aedf; }
.ct-reader-back:focus-visible { outline: 3px solid #aa82d9; outline-offset: 3px; }
[dir="rtl"] .ct-reader-back .ct-icon { transform: rotate(180deg); }
[dir="ltr"] .ct-reader-back .ct-icon { transform: none; }
[data-ct-lesson-theme="dark"] .ct-reader-back { background: #292332; border-color: #493958; color: #d0b2f4; }
[data-ct-lesson-theme="dark"] .ct-reader-back:hover { background: #382c49; border-color: #795595; }
.ct-reader-menu > summary {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    list-style: none;
    border: 1px solid #e6ddef;
    border-radius: 8px;
    background: #f7f3fb;
    color: #7650b2;
    cursor: pointer;
}
.ct-reader-menu > summary::-webkit-details-marker {
    display: none;
}
.ct-reader-menu > summary:hover,
.ct-reader-menu[open] > summary {
    background: #eee5f7;
}
.ct-reader-menu > summary:focus-visible,
.ct-reader-menu-panel a:focus-visible {
    outline: 2px solid #956dc9;
    outline-offset: 3px;
}
.ct-reader-menu-close,
.ct-reader-menu[open] .ct-reader-menu-bars {
    display: none;
}
.ct-reader-menu[open] .ct-reader-menu-close {
    display: block;
}
.ct-reader-menu-panel {
    position: absolute;
    inset-block-start: calc(100% - 5px);
    inset-inline-end: 28px;
    width: 300px;
    max-width: calc(100% - 32px);
    max-height: calc(100dvh - 115px);
    overflow-y: auto;
    padding: 10px;
    border: 1px solid #e6ddef;
    border-radius: 12px;
    background: #fff;
    box-shadow: 0 16px 40px rgb(51 30 76 / 14%);
    text-align: start;
}
[dir="rtl"] .ct-reader-menu-panel {
    text-align: right;
}
[dir="ltr"] .ct-reader-menu-panel {
    text-align: left;
}
.ct-reader-menu-panel nav {
    display: grid;
    gap: 2px;
}
.ct-reader-menu-panel nav > a,
.ct-reader-menu-panel .ct-reader-nav-unavailable {
    display: flex;
    align-items: center;
    min-height: 44px;
    padding: 8px 12px;
    border-radius: 7px;
    color: #71617e;
    font-size: 13px;
    font-weight: 700;
}
.ct-reader-menu-panel .ct-reader-nav-unavailable small {
    margin-inline-start: auto;
}
.ct-reader-menu-panel nav > a:hover,
.ct-reader-menu-panel nav > .ct-active {
    color: #7348ad;
    background: #f2ebfa;
}
.ct-reader-menu-actions {
    display: none;
    justify-content: flex-end;
    margin-block-start: 8px;
    padding: 12px 4px 4px;
    border-top: 1px solid #eee7f4;
}
[data-ct-lesson-theme="dark"] .ct-reader-nav-unavailable,
[data-ct-lesson-theme="dark"] .ct-reader-menu-panel nav > a,
[data-ct-lesson-theme="dark"] .ct-reader-menu-panel .ct-reader-nav-unavailable {
    color: #c4b4d5;
}
[data-ct-lesson-theme="dark"] .ct-reader-nav-unavailable small {
    background: #332b40;
    color: #c2afd6;
}
[data-ct-lesson-theme="dark"] .ct-reader-menu > summary {
    border-color: #493958;
    background: #292332;
    color: #d0b2f4;
}
[data-ct-lesson-theme="dark"] .ct-reader-menu-panel {
    border-color: #493958;
    background: #201c2a;
    box-shadow: 0 16px 40px rgb(0 0 0 / 30%);
}
[data-ct-lesson-theme="dark"] .ct-reader-menu-panel nav > a:hover,
[data-ct-lesson-theme="dark"] .ct-reader-menu-panel nav > .ct-active,
[data-ct-lesson-theme="dark"] .ct-reader-menu > summary:hover,
[data-ct-lesson-theme="dark"] .ct-reader-menu[open] > summary {
    background: #382c49;
    color: #dec6ff;
}
[data-ct-lesson-theme="dark"] .ct-reader-menu-actions {
    border-color: #493958;
}
@media (max-width: 1199px) {
    .ct-site-header .ct-reader-desktop-nav {
        display: none;
    }
    .ct-reader-menu {
        display: block;
    }
}
@media (max-width: 600px) {
    .ct-reader-back { flex-basis: 38px; width: 38px; height: 38px; }
    .ct-site-header .ct-header-inner {
        gap: 10px;
    }
    .ct-header-actions > .ct-header-cta {
        display: none;
    }
    .ct-reader-menu > summary {
        width: 38px;
        height: 38px;
    }
    .ct-reader-menu-panel {
        inset-inline-end: 16px;
    }
    .ct-reader-menu-actions {
        display: flex;
    }
}
@media (max-width: 380px) {
    .ct-reader-page .ct-site-header .ct-brand b { display: none; }
}
@media (prefers-reduced-motion: reduce) {
    .ct-reader-back { transition: none; }
}