/* Navbar — Vasi Web Institute */

:root {
    --nav-blue: #0056e0;
    --nav-blue-dark: #0047b8;
    --nav-white: #ffffff;
    --nav-shadow: 0 4px 24px rgba(0, 40, 120, 0.18);
    --nav-bar-height: 80px;
    --nav-scroll-height: 0px;
    --nav-height: var(--nav-bar-height);
    --nav-font: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
}

.site-nav {
    position: relative;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--nav-blue);
    box-shadow: var(--nav-shadow);
}

.site-nav__inner {
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 1rem;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0.65rem 1.25rem;
    min-height: var(--nav-bar-height);
    overflow: visible;
}

.site-nav__brand {
    display: inline-flex;
    align-items: center;
    flex-shrink: 0;
    padding: 0.4rem 0.85rem;
    text-decoration: none;
    background: var(--nav-white);
    border: 1px solid rgba(255, 255, 255, 0.85);
    border-radius: 12px;
    box-shadow: 0 4px 14px rgba(0, 30, 80, 0.15);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.site-nav__brand:hover,
.site-nav__brand:focus-visible {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(0, 30, 80, 0.22);
    outline: none;
}

.site-nav__logo {
    display: block;
    width: auto;
    height: 52px;
    max-width: 220px;
    object-fit: contain;
    border-radius: 8px;
}

.site-nav__toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    padding: 0;
    border: 2px solid rgba(255, 255, 255, 0.35);
    border-radius: 10px;
    background: transparent;
    cursor: pointer;
}

.site-nav__toggle-bar {
    display: block;
    width: 22px;
    height: 2px;
    margin: 0 auto;
    background: var(--nav-white);
    border-radius: 2px;
    transition: transform 0.25s ease, opacity 0.25s ease;
}

.site-nav__menu {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    flex: 1;
    justify-content: center;
    overflow: visible;
    min-width: 0;
}

.site-nav__links {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    list-style: none;
    margin: 0;
    padding: 0;
    overflow: visible;
    position: relative;
    z-index: 2;
}

.site-nav__link {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.55rem 0.85rem;
    color: var(--nav-white);
    font-family: var(--nav-font);
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    text-decoration: none;
    border-radius: 8px;
    border: none;
    background: transparent;
    cursor: pointer;
    transition: background 0.2s ease, opacity 0.2s ease;
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
    background: rgba(255, 255, 255, 0.12);
    outline: none;
}

.site-nav__link.is-active {
    text-decoration: underline;
    text-underline-offset: 6px;
    text-decoration-thickness: 2px;
}

.site-nav__icon {
    flex-shrink: 0;
}

.site-nav__chevron {
    margin-left: 0.15rem;
    transition: transform 0.2s ease;
}

.site-nav__dropdown {
    position: relative;
}

.site-nav__dropdown.is-open {
    z-index: 1005;
}

.site-nav__dropdown-menu {
    position: absolute;
    top: calc(100% + 0.5rem);
    left: 0;
    min-width: 240px;
    margin: 0;
    padding: 0.5rem;
    list-style: none;
    background: var(--nav-white);
    border-radius: 12px;
    box-shadow: 0 12px 40px rgba(15, 30, 60, 0.18);
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
    z-index: 1006;
    pointer-events: none;
}

.site-nav__dropdown--align-end .site-nav__dropdown-menu {
    left: auto;
    right: 0;
}

.site-nav__dropdown-menu--courses {
    max-height: min(70vh, 420px);
    overflow-y: auto;
    overscroll-behavior: contain;
}

.site-nav__dropdown-label {
    padding: 0.55rem 0.85rem 0.3rem;
    color: #0056e0;
    font-size: 0.6875rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    list-style: none;
    pointer-events: none;
    user-select: none;
}

.site-nav__dropdown-divider {
    height: 1px;
    margin: 0.35rem 0.5rem;
    background: #e2e9f3;
    list-style: none;
}

.site-nav__dropdown-menu a {
    display: block;
    padding: 0.65rem 0.85rem;
    color: #1a2b4a;
    font-size: 0.875rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: 8px;
    transition: background 0.15s ease;
}

.site-nav__dropdown-menu a:hover,
.site-nav__dropdown-menu a:focus-visible {
    background: #eef4ff;
    outline: none;
}

.site-nav__dropdown.is-open .site-nav__dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
}

.site-nav__dropdown.is-open .site-nav__chevron {
    transform: rotate(180deg);
}

.site-nav__actions {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    flex-shrink: 0;
    position: relative;
    z-index: 1;
}

.site-nav__actions--mobile {
    display: none;
}

.site-nav__btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 36px;
    padding: 0.4rem 1rem;
    font-family: var(--nav-font);
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    text-transform: none;
    text-decoration: none;
    border-radius: 8px;
    white-space: nowrap;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 8px rgba(0, 40, 120, 0.12);
}

.site-nav__btn--outline {
    color: var(--nav-white);
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.15) 0%, rgba(255, 255, 255, 0.05) 100%);
    border: 1.5px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}

.site-nav__btn--outline:hover,
.site-nav__btn--outline:focus-visible {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.25) 0%, rgba(255, 255, 255, 0.1) 100%);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0, 40, 120, 0.2);
    outline: none;
}

/* Mobile horizontal quick links — hidden on desktop */
.site-nav__scroll-wrap {
    display: none;
}

.skip-link {
    position: absolute;
    top: -100%;
    left: 1rem;
    z-index: 2000;
    padding: 0.75rem 1rem;
    background: var(--nav-white);
    color: var(--nav-blue);
    font-weight: 600;
    text-decoration: none;
    border-radius: 8px;
}

.skip-link:focus {
    top: 1rem;
}

@media (max-width: 1024px) {
    :root {
        --nav-scroll-height: 46px;
        --nav-height: calc(var(--nav-bar-height) + var(--nav-scroll-height));
    }

    .site-nav__inner {
        justify-content: space-between;
    }

    .site-nav__toggle {
        display: none;
    }

    .site-nav__actions--mobile {
        display: flex;
        align-items: center;
        gap: 0.5rem;
        flex-shrink: 0;
        position: relative;
        z-index: 1;
        flex-direction: row;
        width: auto;
        margin-top: 0;
        padding-top: 0;
        border-top: none;
    }

    .site-nav__btn {
        width: auto;
        min-height: 32px;
        margin-top: 0;
        font-size: 0.625rem;
        padding: 0.28rem 0.75rem;
    }

    .site-nav__scroll-wrap {
        display: block;
        position: relative;
        border-top: 1px solid rgba(255, 255, 255, 0.14);
        background: rgba(0, 35, 100, 0.22);
    }

    .site-nav__scroll-wrap::before,
    .site-nav__scroll-wrap::after {
        content: "";
        position: absolute;
        top: 0;
        bottom: 0;
        width: 1.25rem;
        z-index: 1;
        pointer-events: none;
    }

    .site-nav__scroll-wrap::before {
        left: 0;
        background: linear-gradient(to right, var(--nav-blue), transparent);
    }

    .site-nav__scroll-wrap::after {
        right: 0;
        background: linear-gradient(to left, var(--nav-blue), transparent);
    }

    .site-nav__scroll {
        overflow-x: auto;
        overflow-y: hidden;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none;
        overscroll-behavior-x: contain;
    }

    .site-nav__scroll::-webkit-scrollbar {
        display: none;
    }

    .site-nav__scroll-list {
        display: flex;
        align-items: center;
        gap: 0;
        width: max-content;
        min-width: 100%;
        margin: 0;
        padding: 0 0.75rem;
        list-style: none;
    }

    .site-nav__scroll-link {
        display: block;
        padding: 0.72rem 0.85rem;
        color: rgba(255, 255, 255, 0.92);
        font-family: var(--nav-font);
        font-size: 0.8125rem;
        font-weight: 500;
        letter-spacing: 0.01em;
        text-transform: none;
        text-decoration: none;
        white-space: nowrap;
        border-bottom: 2px solid transparent;
        transition: color 0.2s ease, border-color 0.2s ease;
    }

    .site-nav__scroll-link:hover,
    .site-nav__scroll-link:focus-visible {
        color: #ffffff;
        outline: none;
    }

    .site-nav__scroll-link.is-active {
        color: #ffffff;
        font-weight: 600;
        border-bottom-color: #ffffff;
    }

    .site-nav__scroll-link--sub {
        color: rgba(255, 255, 255, 0.78);
        font-size: 0.75rem;
    }

    .site-nav__scroll-divider {
        flex-shrink: 0;
        width: 1px;
        height: 18px;
        margin: 0 0.15rem;
        background: rgba(255, 255, 255, 0.22);
        list-style: none;
    }

    .site-nav__menu {
        display: none;
    }
}

body.site-nav-open {
    overflow: hidden;
}

.site-nav__backdrop {
    display: none;
}

@media (max-width: 1024px) {
    .site-nav__backdrop {
        display: block;
        position: fixed;
        inset: var(--nav-height) 0 0 0;
        background: rgba(10, 30, 61, 0.45);
        opacity: 0;
        visibility: hidden;
        transition: opacity 0.25s ease, visibility 0.25s;
        z-index: 1000;
        border: none;
        padding: 0;
        cursor: pointer;
    }

    .site-nav__backdrop.is-visible {
        opacity: 1;
        visibility: visible;
    }
}

@media (max-width: 480px) {
    .site-nav__brand {
        padding: 0.3rem 0.65rem;
        border-radius: 10px;
    }

    .site-nav__logo {
        height: 44px;
        max-width: 175px;
        border-radius: 6px;
    }
}