/* ==========================================================================
   FT Grid 1 — Header: Ticker + Navbar
   ========================================================================== */

/* --- Marquee Ticker --- */

.sk-ticker {
    height: var(--sk-ticker-height);
    background: var(--sk-lime);
    overflow: hidden;
    display: flex;
    align-items: center;
    white-space: nowrap;
}

.sk-ticker__track {
    display: flex;
    animation: sk-ticker-scroll 30s linear infinite;
}

.sk-ticker__text {
    font-size: var(--sk-ticker-size);
    color: var(--sk-dark);
    padding-inline-end: 0;
}

@keyframes sk-ticker-scroll {
    0%   { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* --- Navbar --- */

.sk-header {
    height: var(--sk-navbar-height);
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--sk-white);
    border-top: var(--sk-border);
    border-bottom: var(--sk-border);
    overflow: hidden;
    isolation: isolate;
    transition: background-color 0.18s cubic-bezier(0.22, 1, 0.36, 1), border-color 0.18s cubic-bezier(0.22, 1, 0.36, 1);
}

.sk-header::after {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--sk-header-switch-fill, transparent);
    opacity: 0;
    pointer-events: none;
    z-index: 140;
}

.sk-header--switching::after {
    animation: sk-header-switch-flash var(--sk-header-switch-duration, 240ms) ease-out both;
}

.sk-header__inner {
    display: flex;
    align-items: center;
    height: 100%;
    max-width: var(--sk-container-max);
    margin-inline: auto;
    padding-inline-start: var(--sk-padding-md);
    padding-inline-end: 0;
    position: relative;
    z-index: 1;
}

@keyframes sk-header-switch-flash {
    0% {
        opacity: 0;
    }
    35% {
        opacity: 0.16;
    }
    100% {
        opacity: 0;
    }
}

/* Logo — fixed width to align with archive sidebar vertical line */
.sk-header__logo {
    flex-shrink: 0;
    width: calc(var(--sk-sidebar-width) - var(--sk-padding-md));
    padding-inline-end: var(--sk-padding-md);
    box-sizing: border-box;
    display: flex;
    align-items: center;
    background: var(--sk-white);
    transition: background-color 0.18s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.18s cubic-bezier(0.22, 1, 0.36, 1);
}

/* Stacked language buttons — after explore button, far right */
.sk-header__lang-stack {
    display: flex;
    flex-direction: column;
    align-self: stretch;
    flex-shrink: 0;
    transition: background-color 0.18s cubic-bezier(0.22, 1, 0.36, 1);
}

.sk-lang-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 10px;
    font-size: 10px;
    letter-spacing: 1px;
    text-decoration: none;
    color: var(--sk-gray);
    border-inline-start: 1px solid var(--sk-light-gray);
    transition: background 0.15s ease, color 0.15s ease;
}

.sk-header .sk-line-v {
    transition: background-color 0.18s cubic-bezier(0.22, 1, 0.36, 1);
}

.sk-lang-btn:hover {
    background: var(--sk-light-gray);
    color: var(--sk-dark);
}

.sk-lang-btn--active {
    color: var(--sk-dark);
    font-weight: 600;
}

.sk-lang-btn + .sk-lang-btn {
    border-top: 1px solid var(--sk-gray);
}

.sk-logo {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
}

.sk-logo__text {
    font-family: var(--sk-font-body);
    font-size: 17px;
    font-weight: 700;
    color: var(--sk-dark);
    letter-spacing: 0.5px;
    line-height: 1.1;
}

/* Nav */
.sk-header__nav {
    flex: 1;
    display: flex;
    align-items: center;
    padding-inline: var(--sk-padding-md);
}

.sk-nav {
    display: flex;
    align-items: center;
    gap: var(--sk-padding-md);
    list-style: none;
    margin: 0;
    padding: 0;
}

.sk-nav__item,
.sk-nav > .menu-item {
    line-height: 1.1;
}

.sk-nav__link,
.sk-nav > .menu-item > a,
.sk-nav__link.sk-mono {
    color: var(--sk-dark);
    text-decoration: none;
    padding: 4px 0;
    position: relative;
    line-height: inherit;
}

.sk-nav__link::after,
.sk-nav > .menu-item > a::after {
    content: '';
    position: absolute;
    bottom: 0;
    inset-inline-start: 0;
    width: 0;
    height: 4px;
    background: var(--sk-dark);
    transition: width 0.2s ease;
}

.sk-nav__link:hover::after,
.sk-nav__item--active .sk-nav__link::after,
.sk-nav > .menu-item > a:hover::after,
.sk-nav > .current-menu-item > a::after,
.sk-nav > .current-menu-ancestor > a::after {
    width: 100%;
}

/* Dropdown menus */
.sk-nav__item--has-dropdown,
.sk-nav > .menu-item-has-children {
    position: relative;
}

.sk-nav__item--has-dropdown > .sk-nav__link,
.sk-nav > .menu-item-has-children > a {
    cursor: pointer;
}

.sk-nav__arrow {
    display: none;
}

/* Full-width mega dropdown bar — spans from logo to lang switcher */

.sk-nav__item--has-dropdown,
.sk-nav > .menu-item-has-children {
    position: static;
}

.sk-header__nav {
    position: static;
}

.sk-nav {
    position: static;
}

.sk-dropdown,
.sk-nav > .menu-item-has-children > .sub-menu {
    display: none;
    position: absolute;
    top: 100%;
    inset-inline-start: 0;
    inset-inline-end: 0;
    background: var(--sk-badge-en);
    list-style: none;
    margin: 0;
    padding: 0;
    z-index: 110;
    flex-direction: row;
    flex-wrap: nowrap;
    overflow: hidden;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid grey;
}

/* Invisible bridge so mouse can travel from nav item to dropdown */
.sk-dropdown::before,
.sk-nav > .menu-item-has-children > .sub-menu::before {
    content: '';
    position: absolute;
    top: -20px;
    inset-inline-start: 0;
    width: 100%;
    height: 20px;
}

.sk-nav__item--has-dropdown.sk-dropdown--open .sk-dropdown,
.sk-nav > .menu-item-has-children.sk-dropdown--open > .sub-menu {
    display: flex;
}

.sk-nav__item--has-dropdown.sk-dropdown--open .sk-nav__arrow {
    transform: rotate(180deg);
}

.sk-dropdown__item,
.sk-nav > .menu-item-has-children > .sub-menu > .menu-item {
    border-bottom: none;
    border-inline-end: 1px solid rgba(255, 255, 255, 0.15);
}

.sk-dropdown__item:last-child,
.sk-nav > .menu-item-has-children > .sub-menu > .menu-item:last-child {
    border-inline-end: none;
}

.sk-dropdown__link,
.sk-nav > .menu-item-has-children > .sub-menu > .menu-item > a {
    display: flex;
    align-items: center;
    height: 44px;
    box-sizing: border-box;
    padding: 0 20px;
    color: var(--sk-white);
    text-decoration: none;
    font-size: var(--sk-nav-size);
    white-space: nowrap;
    transition: background 0.15s ease;
}

.sk-dropdown__link:hover,
.sk-nav > .menu-item-has-children > .sub-menu > .menu-item > a:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--sk-lime);
}

/* Legacy lang-link (kept for sidebar/other uses) */
.sk-lang-link {
    font-family: var(--sk-font-mono);
    font-size: 10px;
    letter-spacing: 0.3px;
    color: var(--sk-gray);
    text-decoration: none;
    transition: color 0.15s ease;
}

.sk-lang-link:hover {
    color: var(--sk-dark);
}

.sk-lang-link.sk-lang--active {
    color: var(--sk-dark);
}

.sk-lang-sep {
    color: var(--sk-gray);
    margin: 0 4px;
    font-size: 10px;
    opacity: 0.4;
}

/* Explore toggle button — sits above mega dropdown */
.sk-line-v--lang {
    position: relative;
    z-index: 120;
}

.sk-header__lang {
    flex-shrink: 0;
    position: relative;
    z-index: 120;
    display: flex;
    align-self: stretch;
}

.sk-explore-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    font-family: var(--sk-font-mono);
    font-size: var(--sk-nav-size);
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    cursor: pointer;
    border: none;
    padding: 0 16px;
    background: #000000;
    color: var(--sk-white);
    transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

.sk-explore-toggle::before {
    display: none;
}

.sk-explore-toggle:hover {
    background: #222222;
}

.sk-ask-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--sk-font-mono);
    font-size: var(--sk-nav-size);
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    text-decoration: none;
    padding: 0 16px;
    background: var(--sk-tool-chat);
    color: var(--sk-white);
    transition: background 0.25s ease;
}

.sk-ask-toggle:hover {
    background: #0a5a54;
}

.sk-ask-toggle--active {
    background: var(--sk-tool-chat);
}

.sk-explore-toggle--active {
    background: #000000;
    color: var(--sk-white);
    border-inline-start: 0;
}

.sk-explore-toggle--active:hover {
    background: #222222;
}

.sk-research-link {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 14px;
    border-inline-start: 1px solid rgba(0, 0, 0, 0.12);
    background: transparent;
    color: var(--sk-dark);
    text-decoration: none;
    font-family: var(--sk-font-mono);
    font-size: var(--sk-nav-size);
    font-weight: 700;
    letter-spacing: 1px;
    text-transform: uppercase;
    transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.sk-research-link:hover {
    background: rgba(0, 0, 0, 0.06);
    color: var(--sk-dark);
}

.sk-research-link--active {
    background: var(--sk-dark);
    color: var(--sk-white);
    border-color: var(--sk-dark);
}

.sk-research-link--active:hover {
    background: #000;
    color: var(--sk-white);
}

/* Hidden nav — must override display: flex from .sk-header__nav */
.sk-header__nav[hidden] {
    display: none;
}

/* Explore mode — turquoise header */
.sk-header--explore {
    background: #000000;
    border-color: #000000;
}

.sk-header--explore .sk-header__logo {
    background: var(--sk-white);
    align-self: stretch;
    display: flex;
    align-items: center;
    box-shadow: calc(-1 * var(--sk-padding-md)) 0 0 0 var(--sk-white);
}

.sk-header--explore .sk-header__lang {
    background: transparent;
}

.sk-header--explore .sk-header__lang-stack {
    background: #000000;
}

.sk-header--explore .sk-research-link {
    border-color: rgba(255, 255, 255, 0.25);
    color: var(--sk-white);
}

.sk-header--explore .sk-research-link:hover {
    background: rgba(255, 255, 255, 0.12);
    color: var(--sk-white);
}

.sk-header--explore .sk-research-link--active {
    background: rgba(255, 255, 255, 0.18);
    border-color: rgba(255, 255, 255, 0.3);
}

.sk-header--explore .sk-logo__text,
.sk-header--explore .sk-logo {
    color: var(--sk-dark);
}

.sk-header--explore .sk-lang-btn {
    background: transparent;
    color: var(--sk-white);
    border-color: rgba(255, 255, 255, 0.25);
}

.sk-header--explore .sk-lang-btn:hover {
    background: rgba(255, 255, 255, 0.12);
    color: var(--sk-white);
}

.sk-header--explore .sk-lang-btn--active {
    background: rgba(255, 255, 255, 0.18);
    color: var(--sk-white);
}

.sk-header--explore .sk-lang-btn + .sk-lang-btn {
    border-top-color: rgba(255, 255, 255, 0.25);
}

.sk-header--explore .sk-nav__link,
.sk-header--explore .sk-nav > .menu-item > a {
    color: var(--sk-white);
    font-weight: 600;
}

.sk-header--explore .sk-nav__link::after {
    background: var(--sk-white);
}

.sk-header--explore .sk-nav__item--active .sk-nav__link,
.sk-header--explore .sk-nav__link[aria-current="page"] {
    font-weight: 700;
}

.sk-header--explore .sk-nav__item--active .sk-nav__link::after,
.sk-header--explore .sk-nav__link[aria-current="page"]::after {
    width: 100%;
    height: 2px;
}

.sk-header--explore .sk-line-v {
    background: rgba(255, 255, 255, 0.2);
}

@media (prefers-reduced-motion: reduce) {
    .sk-header,
    .sk-explore-toggle {
        transition: none;
    }

    .sk-header--switching::after {
        animation: none;
        opacity: 0;
    }
}

/* Sub-navigation bar (persistent, below header on archive pages) */
.sk-subnav {
    display: flex;
    align-items: center;
    min-height: var(--sk-subnav-height);
    background: var(--sk-dark);
    padding: 0;
    padding-inline-start: var(--sk-sidebar-width);
    position: sticky;
    top: var(--sk-navbar-height);
    z-index: 99;
}

.sk-subnav__link {
    display: flex;
    align-items: center;
    min-height: var(--sk-subnav-height);
    padding: 0 20px;
    color: var(--sk-white);
    text-decoration: none;
    font-size: var(--sk-nav-size);
    line-height: 1;
    white-space: nowrap;
    transition: background 0.15s ease;
    border-inline-end: 1px solid rgba(255, 255, 255, 0.15);
}

.sk-subnav__link:last-child {
    border-inline-end: none;
}

.sk-subnav__link:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--sk-lime);
}

.sk-subnav__link--active {
    background: rgba(255, 255, 255, 0.15);
    color: var(--sk-lime);
}

.sk-subnav__link--empty {
    opacity: 0.35;
    pointer-events: none;
}

/* --- Sub-nav search toggle + expanding field --- */

.sk-subnav__search-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 43px;
    height: var(--sk-subnav-height);
    flex-shrink: 0;
    background: none;
    border: none;
    border-inline-start: 1px solid rgba(255, 255, 255, 0.15);
    border-inline-end: 1px solid rgba(255, 255, 255, 0.15);
    color: var(--sk-white);
    cursor: pointer;
    transition: background 0.15s ease, color 0.15s ease;
}

.sk-subnav__search-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--sk-lime);
}

/* Icon swap: show search icon by default, close icon when open */
.sk-subnav__close-icon {
    display: none;
}

.sk-subnav__search-toggle[aria-expanded="true"] .sk-subnav__search-icon {
    display: none;
}

.sk-subnav__search-toggle[aria-expanded="true"] .sk-subnav__close-icon {
    display: block;
}

.sk-subnav__search-toggle[aria-expanded="true"] {
    background: rgba(255, 255, 255, 0.15);
    color: var(--sk-lime);
}


/* Mobile nav toggle (hidden on desktop) */
.sk-header__toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.sk-header__toggle span {
    display: block;
    width: 24px;
    height: 1px;
    background: var(--sk-dark);
    margin: 6px 0;
}

/* Saved Sets: a narrow stacked item just before Explore, count over label.
   Shown only when the reader has at least one set. */
.sk-saved-toggle {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    align-self: stretch;
    flex-shrink: 0;
    gap: 2px;
    min-width: 44px;
    padding: 0 10px;
    text-decoration: none;
    color: var(--sk-dark);
    background: var(--sk-white);
    transition: background 0.15s ease, color 0.15s ease;
}

.sk-saved-toggle:hover {
    background: var(--sk-light-gray);
}

.sk-saved-toggle[hidden] {
    display: none;
}

.sk-saved-toggle__count {
    font-size: 14px;
    font-weight: 700;
    line-height: 1;
}

.sk-saved-toggle__label {
    font-size: 9px;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--sk-gray);
    line-height: 1;
}

[dir="rtl"] .sk-saved-toggle__label {
    letter-spacing: 0;
}

@media (max-width: 900px) {
    .sk-saved-toggle {
        display: none;
    }
}