:root {
    --c4n-bar: 64px;
}

.c4n-header {
    position: sticky;
    top: 0;
    z-index: 1030;
}
.c4n-header *,
.c4n-header *::before,
.c4n-header *::after {
    box-sizing: border-box;
}
.c4n-skip {
    position: absolute;
    left: -9999px;
    top: 0;
    z-index: 1040;
    padding: .75rem 1.25rem;
    background: #fff;
    color: #1d4ed8;
    font-weight: 600;
    border-radius: 0 0 8px 0;
    box-shadow: 0 4px 16px rgba(0, 0, 0, .15);
}
.c4n-skip:focus {
    left: 0;
}

.c4n-nav {
    position: relative;
    z-index: 2;
    background: #fff;
    border-bottom: 1px solid #e2e8f0;
    box-shadow: 0 1px 3px rgba(15, 23, 42, .06);
}

.c4n-nav__bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    min-height: 64px;
    padding-top: .5rem;
    padding-bottom: .5rem;
}

.c4n-nav__brand {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    font-size: 1.35rem;
    font-weight: 700;
    color: #2563eb;
    text-decoration: none;
    white-space: nowrap;
}
.c4n-nav__brand:hover,
.c4n-nav__brand:focus {
    color: #1d4ed8;
}

.c4n-nav__burger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    padding: 0;
    background: transparent;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
    cursor: pointer;
    color: #334155;
}
.c4n-nav__burger:hover {
    background: #f1f5f9;
}

.c4n-nav__burger-box {
    display: block;
    position: relative;
    width: 20px;
    height: 14px;
}
.c4n-nav__burger-box span {
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background: currentColor;
    border-radius: 2px;
    transition: transform .22s ease, opacity .18s ease, top .22s ease;
}
.c4n-nav__burger-box span:nth-child(1) { top: 0; }
.c4n-nav__burger-box span:nth-child(2) { top: 6px; }
.c4n-nav__burger-box span:nth-child(3) { top: 12px; }

.c4n-nav__burger[aria-expanded="true"] .c4n-nav__burger-box span:nth-child(1) {
    top: 6px;
    transform: rotate(45deg);
}
.c4n-nav__burger[aria-expanded="true"] .c4n-nav__burger-box span:nth-child(2) {
    opacity: 0;
}
.c4n-nav__burger[aria-expanded="true"] .c4n-nav__burger-box span:nth-child(3) {
    top: 6px;
    transform: rotate(-45deg);
}

.c4n-nav__panel {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    background: #fff;
    border-top: 1px solid #e2e8f0;
    box-shadow: 0 12px 28px rgba(15, 23, 42, .12);

    max-height: calc(100vh - var(--c4n-bar));
    max-height: calc(100dvh - var(--c4n-bar));
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    padding: .5rem 0 1rem;
}
.c4n-nav__panel.is-open {
    display: block;
}

.c4n-nav__list,
.c4n-sub {
    list-style: none;
    margin: 0;
    padding: 0;
}

.c4n-nav__row {
    display: flex;
    align-items: stretch;
}

.c4n-nav__link,
.c4n-sub__link {
    flex: 1 1 auto;
    display: flex;
    align-items: center;
    gap: .6rem;
    min-height: 48px;
    padding: .75rem 1.25rem;
    color: #334155;
    font-weight: 500;
    text-decoration: none;
}
.c4n-nav__link:hover,
.c4n-sub__link:hover,
.c4n-nav__link:focus,
.c4n-sub__link:focus {
    background: #f1f5f9;
    color: #1d4ed8;
}
.c4n-nav__link[aria-current="page"],
.c4n-sub__link[aria-current="page"] {
    color: #1d4ed8;
    font-weight: 600;
    box-shadow: inset 3px 0 0 #2563eb;
}

.c4n-nav__expand {
    flex: 0 0 auto;
    width: 52px;
    min-height: 48px;
    padding: 0;
    background: transparent;
    border: 0;
    color: #64748b;
    cursor: pointer;
}
.c4n-nav__expand:hover {
    background: #f1f5f9;
    color: #1d4ed8;
}
.c4n-nav__expand svg {
    width: 14px;
    height: 14px;
    transition: transform .2s ease;
}
.c4n-nav__expand[aria-expanded="true"] svg {
    transform: rotate(180deg);
}

.c4n-sub {
    display: none;
    background: #f8fafc;
}
.c4n-sub.is-open {
    display: block;
}

.c4n-sub .c4n-sub__link {
    padding-left: 2.25rem;
    font-weight: 400;
    font-size: .95rem;
}
.c4n-sub .c4n-sub .c4n-sub__link {
    padding-left: 3.25rem;
    color: #475569;
}
.c4n-sub .c4n-sub {
    background: #f1f5f9;
}

.c4n-sub__icon {
    width: 20px;
    flex: 0 0 20px;
    text-align: center;
    font-size: .9rem;
}

.c4n-sub__link--all {
    color: #2563eb;
    font-weight: 600;
}

.c4n-divider {
    height: 1px;
    margin: .4rem 1.25rem;
    background: #e2e8f0;
}

.c4n-empty {
    padding: .75rem 2.25rem;
    color: #94a3b8;
    font-size: .9rem;
}

.c4n-lang {
    position: relative;
    padding: .75rem 1.25rem 0;
}
.c4n-lang__btn {
    display: inline-flex;
    align-items: center;
    gap: .5rem;
    min-height: 44px;
    padding: .5rem 1rem;
    background: #fff;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
    color: #334155;
    font-size: .9rem;
    font-weight: 500;
    cursor: pointer;
}
.c4n-lang__btn:hover {
    background: #f1f5f9;
    border-color: #94a3b8;
}
.c4n-lang__btn svg {
    width: 12px;
    height: 12px;
    transition: transform .2s ease;
}
.c4n-lang__btn[aria-expanded="true"] svg {
    transform: rotate(180deg);
}
.c4n-lang__menu {
    display: none;
    list-style: none;
    margin: .5rem 0 0;
    padding: .35rem 0;
    background: #fff;
    border: 1px solid #e2e8f0;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(15, 23, 42, .12);
}
.c4n-lang__menu.is-open {
    display: block;
}
.c4n-lang__menu a {
    display: flex;
    align-items: center;
    gap: .6rem;
    min-height: 44px;
    padding: .5rem 1rem;
    color: #334155;
    text-decoration: none;
    font-size: .92rem;
}
.c4n-lang__menu a:hover {
    background: #f1f5f9;
}
.c4n-lang__menu a[aria-current="true"] {
    color: #2563eb;
    font-weight: 600;
    background: #eff6ff;
}

.c4n-nav a:focus-visible,
.c4n-nav button:focus-visible,
.c4n-skip:focus-visible {
    outline: 2px solid #2563eb;
    outline-offset: -2px;
    border-radius: 4px;
}

.c4n-backdrop {
    display: none;
    position: fixed;
    inset: 0;
    top: var(--c4n-bar);
    background: rgba(15, 23, 42, .35);
    z-index: 1;
}
.c4n-backdrop.is-open {
    display: block;
}

@media (min-width: 992px) {
    .c4n-nav__burger,
    .c4n-backdrop {
        display: none !important;
    }

    .c4n-nav__bar {
        gap: 2rem;
    }

    .c4n-nav__panel {
        display: flex !important;
        align-items: center;
        justify-content: space-between;
        flex: 1 1 auto;
        position: static;
        max-height: none;
        overflow: visible;
        padding: 0;
        border-top: 0;
        box-shadow: none;
        background: transparent;
    }

    .c4n-nav__list {
        display: flex;
        align-items: center;
        gap: .25rem;
    }

    .c4n-nav__item {
        position: relative;
    }

    .c4n-nav__row {
        align-items: center;
    }

    .c4n-nav__link {
        min-height: 40px;
        padding: .5rem .35rem .5rem .85rem;
        border-radius: 6px;
    }
    .c4n-nav__link:hover,
    .c4n-nav__link:focus {
        background: transparent;
    }
    .c4n-nav__link[aria-current="page"] {
        box-shadow: none;
    }

    .c4n-nav__item > .c4n-nav__row::after {
        content: "";
        position: absolute;
        left: .85rem;
        right: .85rem;
        bottom: 2px;
        height: 2px;
        background: #2563eb;
        transform: scaleX(0);
        transform-origin: center;
        transition: transform .2s ease;
    }
    .c4n-nav__item:hover > .c4n-nav__row::after,
    .c4n-nav__item:focus-within > .c4n-nav__row::after,
    .c4n-nav__item.is-current > .c4n-nav__row::after {
        transform: scaleX(1);
    }

    .c4n-nav__expand {
        width: 28px;
        min-height: 40px;
        border-radius: 6px;
    }
    .c4n-nav__expand:hover {
        background: transparent;
    }

    .c4n-nav__item > .c4n-sub {
        position: absolute;
        top: calc(100% + 2px);
        left: 0;
        min-width: 270px;
        background: #fff;
        border: 1px solid #e2e8f0;
        border-radius: 10px;
        box-shadow: 0 14px 40px rgba(15, 23, 42, .14);
        padding: .35rem 0;
        z-index: 1035;
    }

    .c4n-sub .c4n-sub {
        position: absolute;
        top: -.35rem;
        left: 100%;
        min-width: 250px;
        background: #fff;
        border: 1px solid #e2e8f0;
        border-radius: 10px;
        box-shadow: 0 14px 40px rgba(15, 23, 42, .14);
        padding: .35rem 0;
    }

    .c4n-sub .c4n-sub.is-flipped {
        left: auto;
        right: 100%;
    }

    .c4n-sub__item {
        position: relative;
    }

    .c4n-sub .c4n-sub__link,
    .c4n-sub .c4n-sub .c4n-sub__link {
        min-height: 42px;
        padding: .55rem 1rem;
        font-size: .93rem;
    }

    .c4n-sub .c4n-nav__expand {
        width: 34px;
        min-height: 42px;
    }

    .c4n-sub__item > .c4n-nav__row > .c4n-nav__expand svg {
        transform: rotate(-90deg);
    }
    .c4n-sub__item > .c4n-nav__row > .c4n-nav__expand[aria-expanded="true"] svg {
        transform: rotate(-90deg);
    }

    .c4n-lang {
        padding: 0;
    }
    .c4n-lang__menu {
        position: absolute;
        right: 0;
        top: calc(100% + .4rem);
        min-width: 190px;
        z-index: 1035;
    }
}

@media (prefers-reduced-motion: reduce) {
    .c4n-nav *,
    .c4n-nav *::after {
        transition: none !important;
    }
}

@media print {
    .c4n-header,
    .c4n-backdrop {
        display: none !important;
    }
}