*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body
{
    background: #180202;
    font-family: sans-serif;
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow-x: hidden;
}

ul
{
    display: grid;
    grid-template-columns: 1fr;
    grid-auto-rows: calc(var(--btn-h) + var(--cell-pad-y));
    place-items: center;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin: 0;
    padding: clamp(8px, 3vw, 24px);
    width: 100%;
}

/* Variabel tema & ukuran responsif */
:root {
    --btn-bg: #117a69;          /* dasar tombol */
    --btn-text: #ffffff;        /* teks & ikon */
    --btn-accent: #03423d;      /* warna aktif/hover (desktop) */
    --btn-side-left: #04292b;   /* sisi kiri (before) saat aktif */
    --btn-side-bottom: #1cbba0; /* sisi bawah (after) saat aktif */
    --btn-side: #0a3d36;        /* sisi default non-hover */

    /* ukuran responsif */
    --btn-w: clamp(90px, 40vw, 220px);
    --btn-h: clamp(52px, 14vw, 110px);
    --cell-pad-x: 48px;
    --cell-pad-y: 42px;
}

ul li
{
    list-style: none;
    margin: 0 5px;
    position: relative;
    isolation: isolate; /* mencegah bayangan tumpang tindih antar grid cell */
    display: flex;
    justify-content: center;
    align-items: center;
    padding: calc(var(--cell-pad-y) / 3) calc(var(--cell-pad-x) / 3);
}

ul li a .fa, ul li a .fa-brands, ul li a .fa-solid
{
    font-size: calc(var(--btn-h) * 0.5);
    color: var(--btn-text);
    line-height: 1;
    transition: 0.5s;
    padding-right: 14px;
}

ul li a span
{
    padding: 0;
    margin: 0;
    color: var(--btn-text);
    letter-spacing: 1px;
    transition: 0.5s;
    font-size: clamp(12px, calc(var(--btn-h) * 0.24), 18px);
    white-space: nowrap;
}

ul li a
{
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
    width: var(--btn-w);
    height: var(--btn-h);
    background: var(--btn-bg);
    padding: 0 16px;
    transform: rotate(-30deg) skewX(25deg) translate(0,0);
    transition: 0.5s;
    box-shadow: -20px 20px 10px rgba(0,0,0,0.5);
    position: relative;
    z-index: 1;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    cursor: pointer;
    transform-origin: center;
}

ul li a:before
{
    content: '';
    position: absolute;
    top: 10px;
    left: -20px;
    height: 100%;
    width: 20px;
    background: var(--btn-side);
    transform: 0.5s;
    transform: rotate(0deg) skewY(-45deg);
    pointer-events: none;
}

ul li a:after
{
    content: '';
    position: absolute;
    bottom: -20px;
    left: -10px;
    height: 20px;
    width: 100%;
    background: var(--btn-side);
    transform: 0.5s;
    transform: rotate(0deg) skewX(-45deg);
    pointer-events: none;
}

ul li a:hover
{
    transform: rotate(-30deg) skew(25deg) translate(20px, -15px);
    box-shadow: -50px 50px 50px rgba(0,0,0,0.5);
}

ul li:hover .fa
{
    color: #fff;
}

ul li:hover span
{
    color: #fff;
}

ul li:hover a
{
    background: var(--btn-accent);
}

ul li:hover a:before
{
    background: var(--btn-side-left);
}

ul li:hover a:after
{
    background: var(--btn-side-bottom);
}

/* Responsif ekstra pada layar kecil */
@media (max-width: 480px) {
    :root { --btn-w: clamp(120px, 88vw, 320px); --btn-h: clamp(56px, 18vw, 120px); --cell-pad-x: 28px; --cell-pad-y: 36px; }
    ul { gap: 8px; padding: 12px; grid-auto-rows: calc(var(--btn-h) + var(--cell-pad-y)); }
    ul li { padding: calc(var(--cell-pad-y) / 3) calc(var(--cell-pad-x) / 3); }
    /* Aktifkan efek 3D yang lebih ringan untuk mobile */
    ul li a {
        transform: rotate(-16deg) skewX(12deg);
        box-shadow: -10px 10px 12px rgba(0,0,0,0.28);
        border-radius: 10px;
        padding: 0 18px;
        transition: 0.3s ease;
    }
    ul li a:before {
        content: '';
        position: absolute;
        top: 8px;
        left: -12px;
        height: 100%;
        width: 12px;
        background: var(--btn-side-left);
        transform: rotate(0deg) skewY(-45deg);
        pointer-events: none;
    }
    ul li a:after {
        content: '';
        position: absolute;
        bottom: -12px;
        left: -6px;
        height: 12px;
        width: 100%;
        background: var(--btn-side-bottom);
        transform: rotate(0deg) skewX(-45deg);
        pointer-events: none;
    }
    /* Gunakan :active (tap) agar terasa responsif di perangkat sentuh */
    ul li a:active { transform: rotate(-16deg) skewX(12deg) translate(2px, -2px); box-shadow: -12px 12px 16px rgba(0,0,0,0.30); }
    ul li a:hover  { transform: rotate(-16deg) skewX(12deg) translate(2px, -2px); box-shadow: -12px 12px 16px rgba(0,0,0,0.30); }
}

/* Preferensi pengguna: kurangi gerakan */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation: none !important; transition: none !important; }
}

 /* Tata letak rapi khusus desktop sambil mempertahankan bentuk 3D */
 @media (min-width: 576px) {
	:root { --btn-w: 220px; --btn-h: 110px; --cell-pad-x: 56px; --cell-pad-y: 48px; }
	ul {
		display: grid;
		grid-template-columns: repeat(auto-fit, minmax(calc(var(--btn-w) + var(--cell-pad-x)), 1fr));
		grid-auto-rows: calc(var(--btn-h) + var(--cell-pad-y));
		justify-content: center;
		align-items: center;
		place-items: center;
		gap: 6px 6px;
		padding: 16px 24px;
	}
	ul li { margin: 0; padding: calc(var(--cell-pad-y) / 6) calc(var(--cell-pad-x) / 6); position: relative; display:flex; justify-content:center; align-items:center; overflow: visible; }
    ul li:hover { z-index: 3; }
    ul li a { transform-origin: center; margin: 0 auto; }
    ul li a:hover { transform: rotate(-25deg) skew(20deg) translate(2px, -2px); box-shadow: -24px 24px 24px rgba(0,0,0,0.4); }
}

/* Penyesuaian ruang untuk layar lebih lebar */
@media (min-width: 768px) {
	:root { --cell-pad-x: 84px; --cell-pad-y: 74px; }
}
@media (min-width: 992px) {
	:root { --cell-pad-x: 90px; --cell-pad-y: 80px; }
}