/* =========================================
   RESET
========================================= */

* {
    box-sizing: border-box;
}

html {
    min-height: 100%;
}

body {
    margin: 0;
    min-height: 100vh;

    padding:
        24px 14px;

    display: flex;
    justify-content: center;
    align-items: center;

    overflow-x: hidden;

    font-family:
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        "Microsoft YaHei",
        Arial,
        sans-serif;

    color: #ffffff;

    background:
        linear-gradient(
            180deg,
            #8fd0f4 0%,
            #77bce9 42%,
            #579bc9 72%,
            #3d82b2 100%
        );
}


/* =========================================
   BACKGROUND
========================================= */

.bg-glow {
    position: fixed;

    border-radius: 50%;

    pointer-events: none;

    filter:
        blur(90px);

    z-index: -3;
}

.bg-glow-left {
    width: 520px;
    height: 520px;

    top: -260px;
    left: -220px;

    background:
        rgba(
            255,
            255,
            255,
            0.70
        );
}

.bg-glow-right {
    width: 500px;
    height: 500px;

    right: -250px;
    bottom: -260px;

    background:
        rgba(
            210,
            241,
            255,
            0.45
        );
}


/* =========================================
   CLOUD SHAPES
========================================= */

.cloud {
    position: fixed;

    width: 260px;
    height: 90px;

    border-radius: 100px;

    background:
        rgba(
            255,
            255,
            255,
            0.13
        );

    filter:
        blur(22px);

    pointer-events: none;

    z-index: -2;
}

.cloud::before,
.cloud::after {
    content: "";

    position: absolute;

    border-radius: 50%;

    background:
        rgba(
            255,
            255,
            255,
            0.13
        );
}

.cloud::before {
    width: 110px;
    height: 110px;

    left: 40px;
    bottom: 10px;
}

.cloud::after {
    width: 90px;
    height: 90px;

    right: 35px;
    bottom: 8px;
}

.cloud-left {
    top: 11%;
    left: -120px;
}

.cloud-right {
    right: -125px;
    bottom: 17%;
}


/* =========================================
   PAGE
========================================= */

.page {
    width: 100%;
    max-width: 430px;

    position: relative;
    z-index: 2;
}


/* =========================================
   TOP BAR
========================================= */

.topbar {
    display: flex;

    justify-content:
        space-between;

    align-items: center;

    gap: 12px;

    margin-bottom: 13px;

    padding:
        0 4px;
}

.brand {
    font-size: 10px;

    font-weight: 700;

    letter-spacing: 1.45px;

    color:
        rgba(
            255,
            255,
            255,
            0.72
        );
}

.capsule-badge {
    flex-shrink: 0;

    padding:
        7px 10px;

    border-radius: 999px;

    font-size: 9px;

    font-weight: 700;

    letter-spacing: 1px;

    background:
        rgba(
            255,
            255,
            255,
            0.17
        );

    border:
        1px solid
        rgba(
            255,
            255,
            255,
            0.28
        );
}


/* =========================================
   MAIN CARD
========================================= */

.music-card {
    width: 100%;

    padding:
        20px;

    border-radius:
        30px;

    background:
        linear-gradient(
            145deg,
            rgba(255,255,255,0.31),
            rgba(255,255,255,0.14)
        );

    border:
        1px solid
        rgba(
            255,
            255,
            255,
            0.42
        );

    backdrop-filter:
        blur(30px);

    -webkit-backdrop-filter:
        blur(30px);

    box-shadow:
        0 28px 75px
        rgba(
            28,
            75,
            111,
            0.30
        );
}


/* =========================================
   COVER
========================================= */

.cover-section {
    position: relative;

    width: 100%;
}

.cover-shadow {
    position: absolute;

    inset:
        8%;

    border-radius:
        28px;

    background:
        rgba(
            185,
            229,
            255,
            0.62
        );

    filter:
        blur(35px);

    opacity:
        0.65;

    transition:
        opacity .4s ease;
}

#cover {
    position: relative;

    display: block;

    width: 100%;

    aspect-ratio:
        1 / 1;

    object-fit:
        cover;

    border-radius:
        25px;

    box-shadow:
        0 25px 55px
        rgba(
            18,
            63,
            97,
            0.34
        );

    transition:
        transform .35s ease,
        box-shadow .35s ease;
}


/* 播放状态 */

.music-card.is-playing #cover {
    animation:
        breathe
        3.2s
        ease-in-out
        infinite;
}

.music-card.is-playing .cover-s