.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.subpage-nav-mobile {
    display: none;
    position: relative;
    margin-left: auto;
}

.subpage-nav-mobile > details {
    position: relative;
}

.subpage-nav-trigger {
    list-style: none;
    min-width: 14rem;
    padding: 0.75rem 1rem;
    border: 1px solid rgba(0, 245, 255, 0.3);
    border-radius: 0.75rem;
    background: linear-gradient(135deg, rgba(5, 6, 9, 0.98), rgba(20, 25, 60, 0.98));
    color: #ffffff;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 0 15px rgba(0, 245, 255, 0.25);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.subpage-nav-trigger::-webkit-details-marker {
    display: none;
}

.subpage-nav-trigger::after {
    content: "";
    width: 0.85rem;
    height: 0.55rem;
    flex-shrink: 0;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='9' viewBox='0 0 14 9'%3E%3Cpath d='M1 1.25 7 7.25l6-6' fill='none' stroke='%2300F5FF' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.8'/%3E%3C/svg%3E") center / contain no-repeat;
    transition: transform 0.25s ease;
}

.subpage-nav-mobile > details[open] .subpage-nav-trigger::after {
    transform: rotate(180deg);
}

.subpage-nav-mobile > details[open] .subpage-nav-trigger,
.subpage-nav-trigger:hover,
.subpage-nav-trigger:focus {
    color: #00F5FF;
    border-color: rgba(0, 245, 255, 0.5);
    box-shadow: 0 0 18px rgba(0, 245, 255, 0.32);
}

.subpage-dropdown-menu {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    min-width: 240px;
    padding: 0.5rem 0;
    border: 1px solid rgba(0, 245, 255, 0.3);
    border-radius: 0.75rem;
    background: linear-gradient(135deg, rgba(5, 6, 9, 0.98), rgba(20, 25, 60, 0.98));
    box-shadow: 0 0 15px rgba(0, 245, 255, 0.25);
    z-index: 1300;
}

.subpage-dropdown-item {
    display: block;
    padding: 0.75rem 1.5rem;
    color: #ffffff;
    text-decoration: none;
    font-size: 0.9rem;
    border-left: 3px solid transparent;
    transition: all 0.25s ease;
}

.subpage-dropdown-item:hover,
.subpage-dropdown-item.is-active {
    background: rgba(0, 245, 255, 0.1);
    color: #00F5FF;
    border-left-color: #00F5FF;
    padding-left: 1.75rem;
}

@media (max-width: 1024px) {
    .header-container {
        gap: 1rem;
    }

    .main-nav {
        display: none !important;
    }

    .subpage-nav-mobile {
        display: block;
    }
}

@media (max-width: 768px) {
    .header-container {
        flex-wrap: wrap;
        align-items: center;
    }

    .header-left,
    .logo-section {
        min-width: 0;
    }

    .logo-copy {
        min-width: 0;
    }

    .claim {
        flex-wrap: wrap;
        row-gap: 0.15rem;
    }

    .subpage-nav-mobile {
        width: 100%;
        margin-left: 0;
    }

    .subpage-nav-mobile > details {
        width: 100%;
    }

    .subpage-nav-trigger {
        width: 100%;
    }

    .subpage-dropdown-menu {
        position: static;
        margin-top: 0.5rem;
        width: 100%;
    }
}

@media (max-width: 480px) {
    .logo-mark {
        width: 68px;
    }

    .logo {
        font-size: 1.05rem;
    }

    .claim {
        font-size: 0.68rem;
        gap: 0.25rem;
    }

    .subpage-nav-trigger {
        font-size: 0.88rem;
    }
}