@import url("https://fonts.googleapis.com/css?family=Quicksand|Montserrat");
.bottom-nav {
    display: none;
}

@media (max-width: 767px) {
    :root {
        /*--background-color: rgb(10, 10, 11);*/
        --indicator-clr: rgb(0, 255, 170);
        --menu-clr: white;
        --items-icons-clr: black;
        --items-text-clr: black;
        --menu-padding-left: 1.6rem;
        --menu-padding-right: var(--menu-padding-left, 1.6rem);
        --menu-padding-top: 1rem;
        --menu-padding-bottom: var(--menu-padding-top, 0);
        --item-width: 4rem;
    }

    *,
    *::before,
    *::after {
        padding: 0;
        margin: 0;
        box-sizing: border-box;
    }

    body {
        min-height: 100vh;
        background-color: var(--background-color);
        overflow: hidden;
    }

    a {
        text-decoration: none;
        -webkit-tap-highlight-color: transparent;
    }

    .bottom-nav {
        display: block !important;
        position: fixed;
        inset: auto 0 0 0;
        z-index: 100;
        max-width: 500px;
        margin: 0 auto;
        background-color: #ffffff;
        border-radius: 5px 5px 0 0;
        isolation: isolate;
        user-select: none;
        --bg-clr-bhind: var(--background-color);
        /* Trick: bỏ border-top cũ, dùng pseudo-element */
    }

        .bottom-nav::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 5px; /* độ dày viền */
            background: linear-gradient(90deg, #189995, #15fff8, #189995, #32fff9, #ff0c0c, #189995, #d17f00);
            background-size: 300% 100%;
            animation: gradientMove 3s linear infinite;
            border-radius: 5px 5px 0 0;
        }

    /* Animation cho gradient chạy ngang */
    @keyframes gradientMove {
        0% {
            background-position: 0% 50%;
        }

        100% {
            background-position: 100% 50%;
        }
    }

    .menu {
        text-transform: uppercase;
        width: 100%;
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 0 var(--menu-padding-left);
        list-style: none;
        /* overflow: hidden; */
        text-overflow: clip;
    }

    .bottom-nav-menu li a {
        display: inline-block;
        min-height: 100%;
        width: var(--item-width);
        padding: 1em;
        position: relative;
        text-align: center;
        display: flex;
        align-items: center;
        justify-content: center;
        -webkit-user-drag: none;
    }

        .bottom-nav-menu li a .icon {
            display: block;
            height: 100%;
            display: flex;
            align-items: center;
            color: var(--items-icons-clr, black);
            font-size: 1.4em;
            font-family: "Montserrat", "Quicksand", sans-serif;
            font-weight: 100;
            transition: transform 300ms ease;
        }

        .bottom-nav-menu li a.active .icon {
            transform: translateY(calc(-50% - var(--menu-padding-top, 1em)));
        }

        .bottom-nav-menu li a .text {
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            top: 100%;
            opacity: 0;
            font-size: 0.7em;
            color: var(--items-text-clr, black);
            transition: opacity 300ms, transform 300ms ease;
            transition-duration: 300ms;
            transition-delay: 40ms;
            font-family: "Quicksand", sans-serif;
            /* color: aliceblue; */
        }

        .bottom-nav-menu li a.active .text {
            opacity: 1;
            transform: translateY(calc(-50% - var(--menu-padding-top, 1em))) translateX(-50%);
        }

    .bottom-nav .indicator {
        --indicator-brdr-size: 0.25rem;
        position: absolute;
        height: 100%;
        border-bottom: 10px solid #f96417;
        aspect-ratio: 1;
        background: #ffffff;
        fill-opacity: 0.2;
        background-size: cover;
        border-radius: 50%;
        left: var(--menu-padding-left);
        top: -50%;
        transform: translateX(calc(((var(--item-width) - 100%) / 2) + (var(--gap, 1rem) + var(--item-width)) * var(--item, 0)));
        transition: all 300ms ease;
        overflow: hidden;
    }

        /* Tạo sóng nước gradient */
        /*.bottom-nav .indicator::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 0;
            width: 200%;
            height: 50%;
            background: linear-gradient(90deg, #008c8cd4, #00bcd4d4, #4dd0e1d4);
            -webkit-mask: url("data:image/svg+xml;utf8,\
      <svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 120 28' preserveAspectRatio='none'>\
        <path d='M0 17 Q30 24 60 17 T120 17 V30 H0 Z' fill='white'/>\
      </svg>") repeat-x;
            -webkit-mask-size: 50% 100%;
            animation: waveMove 5s linear infinite, waveColor 8s ease-in-out infinite;
        }*/

    /* Di chuyển sóng */
    /*@keyframes waveMove {
        0% {
            transform: translateX(0);
        }

        100% {
            transform: translateX(-25%);
        }
    }*/

    /* Đổi màu sóng từ từ */
    /*@keyframes waveColor {
        0% {
            background: linear-gradient(90deg, #008c8cd4, #00bcd4d4, #4dd0e1d4);
        }

        50% {
            background: linear-gradient(90deg, #4dd0e1d4, #80deead4, #00bcd4d4);
        }

        100% {
            background: linear-gradient(90deg, #008c8cd4, #00bcd4d4, #4dd0e1d4);
        }
    }*/

       /* .bottom-nav .indicator::before,
        .bottom-nav .indicator::after {
            --size: 1rem;
            --shadow-y: calc(var(--size) / 2 * -1);
            content: "";
            position: absolute;
            width: var(--size);
            height: var(--size);
            top: 50%;
            background-color: transparent;
            box-shadow: 0 var(--shadow-y) 0 var(--bg-clr-bhind);
            z-index: -1;
        }

        .bottom-nav .indicator::before {
            right: 100%;
            border-top-right-radius: 100%;
        }

        .bottom-nav .indicator::after {
            left: 100%;
            border-top-left-radius: 100%;
        }*/
    /* Áp dụng cho thẻ a.active bên trong menu */
    .bottom-nav-menu li a.active2 {
        animation: shake 1.2s infinite; /* chạy lặp vô hạn */
        display: inline-block; /* cần để transform hoạt động tốt */
    }

    /* Hiệu ứng rung */
    @keyframes shake {
        0% {
            transform: translate(0, 0) rotate(0deg);
        }

        20% {
            transform: translate(-2px, 0) rotate(-5deg);
        }

        40% {
            transform: translate(2px, 0) rotate(5deg);
        }

        60% {
            transform: translate(-2px, 0) rotate(-5deg);
        }

        80% {
            transform: translate(2px, 0) rotate(5deg);
        }

        100% {
            transform: translate(0, 0) rotate(0deg);
        }
    }
    #btn-top {
    
        /* Animation */
        animation: bounce 1.2s infinite;
    }

        #btn-top img {
            width: 24px;
            height: 24px;
        }

    /* Keyframes cho nhún nhảy */
    @keyframes bounce {
        0%, 100% {
            transform: translateY(0);
        }

        50% {
            transform: translateY(-6px);
        }
    }


}