:root {
    --void: #0a0a0a;
    --blue: #3e7bff;
    --purple: #a050ff;
}

* {
    box-sizing: border-box;
}

.rpm-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: transparent;
    transition: background 0.4s ease, padding 0.4s ease, box-shadow 0.4s ease;
    padding: 1.5rem 0;
}


    .rpm-header.scrolled {
        background: rgba(10, 10, 10, 0.85);
        backdrop-filter: blur(14px);
        -webkit-backdrop-filter: blur(14px);
        padding: 0.8rem 0;
        box-shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
    }

.rpm-header-inner {
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.rpm-logo img {
    height: 120px;
    width: auto;
    display: block;
    transition: transform 0.4s ease, filter 0.4s ease;
}

.rpm-logo:hover img {
    transform: scale(1.05);
    filter: drop-shadow(0 0 14px rgba(62, 123, 255, 0.5));
}

.rpm-nav {
    display: flex;
    align-items: center;
    gap: 5.6rem;
    border: 1px solid #fff;
    border-radius: 50px;
    padding: 10px;
}

.rpm-nav-link {
    position: relative;
    color: white;
    text-decoration: none;
    font-size: 1.4rem;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    padding: 0.4rem 0;
    opacity: 1;
}

    .rpm-nav-link::after {
        content: "";
        position: absolute;
        left: 0;
        bottom: 0;
        width: 0;
        height: 2px;
        background: linear-gradient(90deg, var(--blue), #a050ff);
        transition: width 0.35s ease;
        border: none !important;
    }

    .rpm-nav-link:hover,
    .rpm-nav-link.active {
        opacity: 1;
        background: linear-gradient(100deg, var(--blue), var(--purple)) !important;
        -webkit-background-clip: text !important;
        background-clip: text !important;
        -webkit-text-fill-color: transparent !important;
        color: transparent !important;
        outline: none !important;
        box-shadow: none !important;
        border: none !important;
    }
        .rpm-nav-link:hover::after,
        .rpm-nav-link.active::after {
            width: 100%;
            border: none !important;
            outline: none !important;
            box-shadow: none !important;
        }

.rpm-header-actions {
    display: flex;
    align-items: center;
    gap: 1.3rem;
}

.rpm-search-btn {
    background: none;
    border: none;
    color: #fff;
    font-size: 1.1rem;
    cursor: pointer;
    opacity: 0.85;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

    .rpm-search-btn:hover {
        opacity: 1;
        transform: scale(1.1);
    }

/* burger — hidden on desktop */
.rpm-burger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 30px;
    height: 24px;
    background: none;
    border: none;
    cursor: pointer;
    z-index: 1100;
}

    .rpm-burger span {
        display: block;
        height: 2px;
        width: 100%;
        background: #fff;
        border-radius: 2px;
        transition: transform 0.35s ease, opacity 0.35s ease;
    }

    .rpm-burger.open span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }

    .rpm-burger.open span:nth-child(2) {
        opacity: 0;
    }

    .rpm-burger.open span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }

/* mobile slide-in panel */
.rpm-mobile-menu {
    position: fixed;
    top: 0;
    right: 0;
    height: 100vh;
    width: min(320px, 80vw);
    background: rgba(10, 10, 10, 0.98);
    backdrop-filter: blur(10px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 1.8rem;
    padding: 2rem;
    transform: translateX(100%);
    transition: transform 0.45s cubic-bezier(0.77, 0, 0.175, 1);
    z-index: 1050;
}

    .rpm-mobile-menu.open {
        transform: translateX(0);
    }

.rpm-mobile-link {
    color: #fff;
    font-size: 1.4rem;
    font-weight: 600;
    text-decoration: none;
    opacity: 0;
    transform: translateY(14px);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.rpm-mobile-menu.open .rpm-mobile-link {
    opacity: 1;
    transform: translateY(0);
}

    .rpm-mobile-menu.open .rpm-mobile-link:nth-child(1) {
        transition-delay: 0.1s;
    }

    .rpm-mobile-menu.open .rpm-mobile-link:nth-child(2) {
        transition-delay: 0.16s;
    }

    .rpm-mobile-menu.open .rpm-mobile-link:nth-child(3) {
        transition-delay: 0.22s;
    }

    .rpm-mobile-menu.open .rpm-mobile-link:nth-child(4) {
        transition-delay: 0.28s;
    }

    .rpm-mobile-menu.open .rpm-mobile-link:nth-child(5) {
        transition-delay: 0.34s;
    }

@media (max-width: 900px) {
    .rpm-nav {
        display: none;
    }

    .rpm-burger {
        display: flex;
    }
}


/*BACK TO Top CSS*/
a.backtotop {
    background: linear-gradient(135deg, var(--blue), var(--purple));
}

    a.backtotop:before {
        background: linear-gradient(135deg, var(--blue), var(--purple));
    }