.ngk-return-nav,
.ngk-return-nav * {
    box-sizing: border-box;
}

.ngk-return-nav {
    --ink: #17213e;
    --muted: #697189;
    width: 100%;
    max-width: 1160px;
    margin: 20px auto;
    padding: 0 10px;
    font-family: inherit;
}

.ngk-return-nav__top {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin: 0 0 12px;
    text-align: center;
}

.ngk-return-nav__top > div {
    flex: 0 0 auto;
}

.ngk-return-nav__top small {
    display: block;
    font-size: 10px;
    letter-spacing: .16em;
    font-weight: 900;
    color: #795e48;
    margin-bottom: 1px;
}

.ngk-return-nav__top strong {
    display: block;
    color: var(--ink);
    font-size: 15px;
    line-height: 1.3;
}

.ngk-return-nav__line {
    height: 1px;
    max-width: 140px;
    flex: 1;
    background: linear-gradient(90deg, transparent, #ccb8a7);
}

.ngk-return-nav__line:last-child {
    background: linear-gradient(90deg, #ccb8a7, transparent);
}

.ngk-return-nav__grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
}

.ngk-return-tile {
    --accent: #68529d;
    --accent2: #46356f;
    --soft: #f1edf8;

    position: relative;
    display: grid;
    grid-template-columns: 40px minmax(0,1fr) 30px;
    align-items: center;
    gap: 10px;
    min-height: 72px;
    padding: 9px 11px 9px 16px;
    overflow: hidden;

    background:
        linear-gradient(135deg, #ffffff 35%, color-mix(in srgb, var(--soft) 78%, white));
    color: var(--ink) !important;
    text-decoration: none !important;

    border: 1px solid color-mix(in srgb, var(--accent) 28%, #e7e2dc);
    border-radius: 12px;
    box-shadow:
        0 4px 12px rgba(31,36,54,.07),
        inset 0 1px 0 rgba(255,255,255,.8);

    isolation: isolate;

    transition:
        transform .28s cubic-bezier(.2,.8,.2,1),
        box-shadow .28s ease,
        border-color .28s ease,
        background .28s ease;
}

.ngk-return-tile__accent {
    position: absolute;
    left: 0;
    top: 10px;
    bottom: 10px;
    width: 4px;
    border-radius: 0 5px 5px 0;
    background: linear-gradient(180deg, var(--accent), var(--accent2));
    transition:
        width .28s ease,
        top .28s ease,
        bottom .28s ease;
}

.ngk-return-tile__shine {
    position: absolute;
    top: -35%;
    left: -48%;
    width: 34%;
    height: 180%;
    transform: skewX(-20deg);
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255,255,255,.82),
        transparent
    );
    opacity: 0;
    pointer-events: none;
    z-index: -1;
}

.ngk-return-tile__icon {
    width: 38px;
    height: 38px;
    border-radius: 11px;
    display: grid;
    place-items: center;

    background:
        linear-gradient(145deg, var(--accent), var(--accent2));
    color: #fff;

    font-size: 12px;
    font-weight: 900;

    box-shadow:
        0 6px 14px color-mix(in srgb, var(--accent) 24%, transparent);

    transition:
        transform .28s ease,
        box-shadow .28s ease;
}

.ngk-return-tile__copy {
    display: block;
    min-width: 0;
}

.ngk-return-tile__copy small {
    display: block;
    color: var(--accent2);
    font-size: 8px;
    font-weight: 900;
    letter-spacing: .07em;
    margin-bottom: 1px;
    transition:
        color .28s ease,
        transform .28s ease;
}

.ngk-return-tile__copy strong {
    display: block;
    color: var(--ink);
    font-size: 15px;
    line-height: 1.1;
    margin-bottom: 2px;
    transition:
        color .28s ease,
        transform .28s ease,
        text-shadow .28s ease;
}

.ngk-return-tile__copy em {
    display: block;
    color: var(--muted);
    font-size: 10px;
    font-style: normal;
    line-height: 1.2;
}

.ngk-return-tile__go {
    width: 26px;
    height: 26px;
    border-radius: 9px;
    display: grid;
    place-items: center;

    color: #fff;
    background:
        linear-gradient(145deg, var(--accent), var(--accent2));

    font-size: 16px;
    font-weight: 900;

    box-shadow:
        0 5px 12px color-mix(in srgb, var(--accent) 22%, transparent);

    transition:
        transform .28s cubic-bezier(.2,.8,.2,1),
        box-shadow .28s ease,
        filter .28s ease;
}

/* Deeper premium palette, distinct from the main JLPT roadmap. */
.ngk-return-tile--home {
    --accent:#556274;
    --accent2:#354151;
    --soft:#e9edf1;
}

.ngk-return-tile--n5 {
    --accent:#2f8a68;
    --accent2:#176347;
    --soft:#e3f4ec;
}

.ngk-return-tile--n4 {
    --accent:#b58a25;
    --accent2:#806015;
    --soft:#f7efd7;
}

.ngk-return-tile--n3 {
    --accent:#c46842;
    --accent2:#90452c;
    --soft:#f8e8df;
}

.ngk-return-tile--n2 {
    --accent:#536ea9;
    --accent2:#354b7d;
    --soft:#e8edf8;
}

.ngk-return-tile--n1 {
    --accent:#a94f61;
    --accent2:#773344;
    --soft:#f7e6ea;
}

@media (hover:hover) and (pointer:fine) {
    .ngk-return-tile:hover {
        transform: translateY(-4px) scale(1.012);
        border-color: var(--accent);
        background:
            linear-gradient(135deg, #fff 22%, color-mix(in srgb, var(--soft) 92%, white));
        box-shadow:
            0 12px 28px color-mix(in srgb, var(--accent) 18%, transparent),
            0 4px 12px rgba(31,36,54,.08),
            inset 0 0 0 1px color-mix(in srgb, var(--accent) 18%, transparent);
    }

    .ngk-return-tile:hover .ngk-return-tile__accent {
        width: 6px;
        top: 0;
        bottom: 0;
    }

    .ngk-return-tile:hover .ngk-return-tile__shine {
        opacity: 1;
        animation: ngk-return-sweep .72s ease forwards;
    }

    .ngk-return-tile:hover .ngk-return-tile__icon {
        transform: translateY(-2px) rotate(-4deg) scale(1.06);
        box-shadow:
            0 10px 20px color-mix(in srgb, var(--accent) 34%, transparent);
    }

    .ngk-return-tile:hover .ngk-return-tile__copy small {
        transform: translateX(2px);
        color: var(--accent);
    }

    .ngk-return-tile:hover .ngk-return-tile__copy strong {
        transform: translateX(2px);
        color: var(--accent2);
        text-shadow: 0 3px 12px color-mix(in srgb, var(--accent) 14%, transparent);
    }

    .ngk-return-tile:hover .ngk-return-tile__go {
        transform: translateX(4px) scale(1.12);
        filter: brightness(1.08);
        box-shadow:
            0 9px 18px color-mix(in srgb, var(--accent) 38%, transparent);
    }
}

@keyframes ngk-return-sweep {
    from { left: -48%; }
    to   { left: 122%; }
}

@media (max-width: 900px) {
    .ngk-return-nav__grid {
        grid-template-columns: repeat(2, minmax(0,1fr));
    }
}

@media (max-width: 600px) {
    .ngk-return-nav {
        margin: 16px auto;
        padding: 0 6px;
    }

    .ngk-return-nav__grid {
        grid-template-columns: 1fr;
        gap: 7px;
    }

    .ngk-return-tile {
        min-height: 66px;
        grid-template-columns: 36px minmax(0,1fr) 26px;
        gap: 9px;
        padding: 8px 10px 8px 14px;
        border-radius: 11px;
    }

    .ngk-return-tile__accent {
        top: 9px;
        bottom: 9px;
        width: 3px;
    }

    .ngk-return-tile__icon {
        width: 34px;
        height: 34px;
        border-radius: 9px;
        font-size: 11px;
    }

    .ngk-return-tile__copy strong {
        font-size: 14px;
    }

    .ngk-return-tile__copy em {
        font-size: 9.5px;
    }

    .ngk-return-tile__go {
        width: 24px;
        height: 24px;
        border-radius: 8px;
        font-size: 15px;
    }

    .ngk-return-nav__line {
        max-width: 50px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .ngk-return-tile,
    .ngk-return-tile__accent,
    .ngk-return-tile__icon,
    .ngk-return-tile__copy small,
    .ngk-return-tile__copy strong,
    .ngk-return-tile__go {
        transition: none !important;
    }

    .ngk-return-tile__shine {
        display: none !important;
    }
}