.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1030;
    background: transparent;
}

.main-navbar {
    min-height: 46px;
    background-color: rgba(248, 249, 250, 0.96);
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
    backdrop-filter: blur(8px);
    z-index: 3;
}

.main-navbar .container-custom {
    display: flex;
    align-items: center;
    justify-content: flex-start;
}

.main-navbar .navbar-collapse {
    flex-grow: 0;
}

.main-navbar .navbar-nav {
    align-items: center;
    justify-content: flex-start;
    gap: 0.95rem;
}

.main-navbar .nav-item {
    position: relative;
}

.main-navbar .nav-link {
    position: relative;
    display: inline-flex;
    align-items: center;
    color: #495057;
    font-weight: 500;
    padding: 0.64rem 0 0.56rem;
    background: transparent;
    border: none;
    transition: color 0.2s ease;
}

.main-navbar .nav-link:hover,
.main-navbar .nav-link:focus {
    color: var(--color-primary);
    background: transparent;
}

.main-navbar .nav-link::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0.14rem;
    height: 3px;
    border-radius: 999px;
    background: linear-gradient(
        90deg,
        var(--color-primary),
        rgba(13, 110, 253, 0.45)
    );
    transform: scaleX(0);
    transform-origin: left center;
    transition: transform 0.22s ease;
    pointer-events: none;
}

.main-navbar .nav-link:hover::before,
.main-navbar .nav-link:focus::before,
.main-navbar .nav-link.active::before {
    transform: scaleX(1);
}

.main-navbar .nav-link.active {
    color: var(--color-primary);
    font-weight: 600;
}

.main-navbar .nav-link.dropdown-toggle {
    gap: 0.38rem;
}

.main-navbar .dropdown-toggle::after {
    content: "";
    display: inline-block;
    width: 8px;
    height: 8px;
    margin-left: 0.08rem;
    margin-top: -2px;
    vertical-align: middle;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    border-top: 0;
    border-left: 0;
    transform: rotate(45deg);
    opacity: 0.7;
    transition: transform 0.2s ease, opacity 0.2s ease;
    flex-shrink: 0;
}

.main-navbar .nav-link.dropdown-toggle:hover::after,
.main-navbar .nav-link.dropdown-toggle:focus::after,
.main-navbar .nav-link.dropdown-toggle.active::after {
    opacity: 1;
}

.main-navbar .nav-item.show .nav-link.dropdown-toggle::after {
    transform: rotate(225deg);
    margin-top: 3px;
}

.main-navbar .dropdown-menu {
    margin-top: 0.32rem;
    padding: 0.5rem 0.6rem;
    min-width: 240px;
    border: 1px solid rgba(0, 0, 0, 0.05);
    border-radius: 1rem;
    background-color: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(8px);
    box-shadow:
        0 12px 30px rgba(0, 0, 0, 0.10),
        0 2px 8px rgba(0, 0, 0, 0.04);
}

.main-navbar .dropdown-menu li + li {
    margin-top: 0.12rem;
}

.main-navbar .dropdown-item {
    position: relative;
    color: #495057;
    font-weight: 500;
    border-radius: 0.75rem;
    padding: 0.66rem 0.95rem 0.66rem 1rem;
    background: transparent;
    transition:
        color 0.2s ease,
        background-color 0.2s ease,
        padding-left 0.2s ease;
}

.main-navbar .dropdown-item::before {
    content: "";
    position: absolute;
    left: 0.45rem;
    top: 50%;
    transform: translateY(-50%) scaleY(0);
    transform-origin: center;
    width: 4px;
    height: 65%;
    border-radius: 999px;
    background: linear-gradient(
        180deg,
        var(--color-primary),
        rgba(13, 110, 253, 0.45)
    );
    transition: transform 0.2s ease;
}

.main-navbar .dropdown-item:hover,
.main-navbar .dropdown-item:focus {
    color: var(--color-primary);
    background-color: rgba(13, 110, 253, 0.06);
    padding-left: 1.15rem;
}

.main-navbar .dropdown-item:hover::before,
.main-navbar .dropdown-item:focus::before {
    transform: translateY(-50%) scaleY(1);
}

.main-navbar .dropdown-item.active,
.main-navbar .dropdown-item:active {
    color: var(--color-primary);
    background-color: rgba(13, 110, 253, 0.10);
    font-weight: 600;
    padding-left: 1.15rem;
}

.main-navbar .dropdown-item.active::before,
.main-navbar .dropdown-item:active::before {
    transform: translateY(-50%) scaleY(1);
}

.main-navbar .navbar-toggler {
    margin-left: auto;
    border-color: rgba(0, 0, 0, 0.15);
    background: rgba(255, 255, 255, 0.65);
}

.main-navbar .navbar-toggler:focus {
    box-shadow: none;
}

.main-navbar .navbar-toggler-icon {
    filter: none;
}

@media (max-width: 991.98px) {
    .main-navbar .container-custom {
        justify-content: space-between;
    }

    .main-navbar .navbar-collapse {
        flex-grow: 1;
        background-color: rgba(248, 249, 250, 0.97);
        margin-top: 0.3rem;
        padding: 0.75rem;
        border: 1px solid rgba(0, 0, 0, 0.06);
        border-radius: 0.85rem;
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.10);
        backdrop-filter: blur(8px);
    }

    .main-navbar .navbar-nav {
        align-items: flex-start;
        gap: 0.2rem;
        width: 100%;
    }

    .main-navbar .nav-item {
        width: 100%;
    }

    .main-navbar .nav-link {
        width: 100%;
        justify-content: flex-start;
        padding: 0.7rem 0;
    }

    .main-navbar .nav-link::before {
        left: 0;
        right: auto;
        width: 42px;
        bottom: 0.16rem;
        transform: scaleX(0);
        transform-origin: left center;
    }

    .main-navbar .nav-link:hover::before,
    .main-navbar .nav-link:focus::before,
    .main-navbar .nav-link.active::before {
        transform: scaleX(1);
    }

    .main-navbar .dropdown-menu {
        margin-top: 0.3rem;
        margin-left: 0;
        width: 100%;
        min-width: 0;
        padding: 0.4rem;
        border-radius: 0.85rem;
        box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.04);
        background-color: rgba(255, 255, 255, 0.92);
        backdrop-filter: none;
    }
}

.module-tab i {
    font-size: 0.95rem;
    vertical-align: -1px;
}