/* Shared public navigation, adopted from the tutorials catalogue. */
.ct-public-header, #ct-public-menu {
    --ct-surface:#fff; --ct-ink:#292338; --ct-muted:#756682; --ct-line:#e4d8ef;
    --ct-soft:#f3edf9; --ct-accent:#7d50b4; --ct-accent-hover:#674092; --ct-on-accent:#fff;
}
html[data-ct-lesson-theme="dark"] .ct-public-header, html[data-ct-lesson-theme="dark"] #ct-public-menu {
    --ct-surface:#211b2d; --ct-ink:#f3edf8; --ct-muted:#c5b5d4; --ct-line:#4c3d60;
    --ct-soft:#32263f; --ct-accent:#bf9be9; --ct-accent-hover:#d1b4ef; --ct-on-accent:#251831;
}
.ct-public-header {
    position: sticky;
    top: 0;
    z-index: 30;
    background: var(--ct-surface);
    border-bottom: 1px solid var(--ct-line);
    color: var(--ct-ink);
    font: 500 15px/1.75 'Cairo', sans-serif;
    -webkit-font-smoothing: antialiased;
}
.ct-public-header *, .ct-public-header *::before, .ct-public-header *::after { box-sizing: border-box; }
.ct-public-header a { color: inherit; text-decoration: none; }
.ct-public-header :focus-visible { outline: 3px solid var(--ct-accent); outline-offset: 5px; }
.ct-public-wrap { width: min(1240px, calc(100% - 88px)); margin-inline: auto; }
.ct-public-header-inner { display: flex; align-items: center; gap: 42px; min-height: 84px; }
.ct-public-logo { display: inline-flex; align-items: center; flex-shrink: 0; gap: 10px; }
.ct-public-logo-mark { width: 52px; height: 40px; }
.ct-public-logo > span { font-size: 21px; font-weight: 900; letter-spacing: 1px; }
.ct-public-nav { display: flex; align-items: center; gap: 27px; font-size: 13px; font-weight: 750; color: var(--ct-muted); }
.ct-public-nav > * { white-space: nowrap; position: relative; }
.ct-public-nav a { padding-block: 29px; }
.ct-public-nav a:hover, .ct-public-nav .ct-is-current { color: var(--ct-accent); }
.ct-public-nav .ct-is-current::after { content: ''; width: 5px; height: 5px; border-radius: 50%; background: var(--ct-accent); position: absolute; inset-block-end: 14px; left: calc(50% - 2px); }
.ct-public-nav small { color: var(--ct-muted); background: var(--ct-soft); font-size: 9px; border-radius: 4px; padding: 1px 5px; margin-inline-start: 4px; }
.ct-public-header-actions { margin-inline-start: auto; display: flex; gap: 12px; align-items: center; }
.ct-public-header .ct-reader-back { display:grid; place-items:center; flex-shrink:0; width:40px; height:42px; border:1px solid var(--ct-line); border-radius:10px; color:var(--ct-accent); background:var(--ct-surface); }
.ct-public-header .ct-reader-back svg { width:20px; height:20px; }
.ct-public-header .ct-header-cta { display:inline-flex; align-items:center; gap:6px; padding:9px 13px; background:var(--ct-accent); color:var(--ct-on-accent); border-radius:10px; font-size:12px; font-weight:800; white-space:nowrap; }
.ct-public-header .ct-header-cta svg { width:18px; height:18px; }
.ct-public-header [hidden] { display:none !important; }
.ct-public-theme { display: grid; place-items: center; flex-shrink: 0; width: 42px; height: 42px; padding: 10px; border: 1px solid var(--ct-line); border-radius: 12px; background: var(--ct-surface); color: var(--ct-accent); font: inherit; cursor: pointer; }
.ct-public-theme:hover { border-color: var(--ct-accent); background: var(--ct-soft); }
.ct-public-theme svg { width: 20px; height: 20px; }
.ct-public-sun { display: none; }
[data-ct-lesson-theme="dark"] .ct-public-sun { display: block; }
[data-ct-lesson-theme="dark"] .ct-public-moon { display: none; }
.ct-public-header .ct-public-button { display: inline-flex; align-items: center; justify-content: center; gap: 16px; border: 1px solid transparent; background: var(--ct-accent); color: var(--ct-on-accent); padding: 9px 17px; min-height: 42px; border-radius: 10px; font-size: 12px; font-weight: 800; white-space: nowrap; box-shadow: 0 8px 20px #6440961a; transition: background .2s, transform .2s, box-shadow .2s; }
.ct-public-header .ct-public-button:hover { background: var(--ct-accent-hover); transform: translateY(-2px); box-shadow: 0 12px 26px #64409626; }
.ct-public-arrow { display: inline-block; font: 23px/1 sans-serif; }
[dir="ltr"] .ct-public-arrow { transform: scaleX(-1); }
@media (min-width: 1600px) {
    .ct-public-wrap { width: min(1320px, calc(100% - 120px)); }
}
@media (max-width: 1199px) {
    .ct-public-wrap { width: calc(100% - 56px); }
    .ct-public-header-inner { gap: 25px; }
    .ct-public-nav { gap: 18px; }
    .ct-public-nav > span { display: none; }
}
@media (max-width: 950px) {
    .ct-public-header-inner { gap: 22px; min-height: 73px; }
    .ct-public-nav { gap: 16px; }
    .ct-public-nav a { font-size: 11px; }
    .ct-public-logo > span { font-size: 17px; }
    .ct-public-logo-mark { width: 42px; }
}
@media (max-width: 720px) {
    .ct-public-wrap { width: calc(100% - 36px); }
    .ct-public-header-inner { min-height: 69px; gap: 15px; flex-wrap: wrap; padding-top: 11px; }
    .ct-public-header-actions { gap: 8px; }
    .ct-public-header .ct-public-button { padding: 7px 12px; font-size: 10px; gap: 10px; min-height: 37px; }
    .ct-public-theme { width: 37px; height: 37px; padding: 8px; }
    .ct-public-header .ct-reader-back { width:35px; height:37px; }
    .ct-public-header .ct-header-cta { padding:8px 10px; font-size:10px; }
    .ct-public-header .ct-header-cta svg { display:none; }
    .ct-public-logo { gap: 6px; }
    .ct-public-logo > span { font-size: 16px; }
    .ct-public-logo-mark { width: 37px; height: 32px; }
    .ct-public-nav { width: 100%; order: 3; justify-content: space-between; border-top: 1px solid var(--ct-line); gap: 12px; }
    .ct-public-nav a { padding-block: 10px; font-size: 10px; }
    .ct-public-nav .ct-is-current::after { inset-block-end: 2px; width: 3px; height: 3px; }
}
@media (max-width: 370px) {
    .ct-public-wrap { width: calc(100% - 28px); }
    .ct-public-header-inner { gap: 10px; }
    .ct-public-logo > span { font-size: 14px; }
    .ct-public-nav { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 8px; justify-items: center; }
}
@media (prefers-reduced-motion: reduce) {
    .ct-public-header .ct-public-button { transition: none; }
    .ct-public-header .ct-public-button:hover { transform: none; }
}