:root {
    color-scheme: light;
    --color-page: #f6f7f9;
    --color-surface: #ffffff;
    --color-surface-muted: #eef1f4;
    --color-surface-subtle: #f4f6f8;
    --color-text: #171a1f;
    --color-text-muted: #626a76;
    --color-text-soft: #8a93a0;
    --color-border: #d9dee6;
    --color-border-subtle: #e6e9ee;
    --color-primary: #171a1f;
    --color-primary-hover: #30343b;
    --color-primary-text: #ffffff;
    --color-secondary: #eceff3;
    --color-secondary-hover: #dfe4ea;
    --color-secondary-text: #2d333b;
    --color-danger: #c73535;
    --color-danger-hover: #ad2e2e;
    --color-danger-soft: #fff0f0;
    --color-danger-text: #b22d2d;
    --color-success: #2f9d63;
    --color-info: #2f78c4;
    --color-focus: #4f83ff;
    --shadow-surface: 0 1px 2px rgba(15, 23, 42, 0.06);
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        color-scheme: dark;
        --color-page: #111111;
        --color-surface: #1b1b1b;
        --color-surface-muted: #242424;
        --color-surface-subtle: #202020;
        --color-text: #f1f1f1;
        --color-text-muted: #b8b8b8;
        --color-text-soft: #8f8f8f;
        --color-border: #343434;
        --color-border-subtle: #2a2a2a;
        --color-primary: #f1f1f1;
        --color-primary-hover: #ffffff;
        --color-primary-text: #111111;
        --color-secondary: #242424;
        --color-secondary-hover: #303030;
        --color-secondary-text: #eeeeee;
        --color-danger: #e05a5a;
        --color-danger-hover: #f06a6a;
        --color-danger-soft: #342020;
        --color-danger-text: #ff9999;
        --color-success: #49b77b;
        --color-info: #5a9fe5;
        --color-focus: #7da2ff;
        --shadow-surface: 0 1px 2px rgba(0, 0, 0, 0.28);
    }
}

:root[data-theme="dark"] {
    color-scheme: dark;
    --color-page: #111111;
    --color-surface: #1b1b1b;
    --color-surface-muted: #242424;
    --color-surface-subtle: #202020;
    --color-text: #f1f1f1;
    --color-text-muted: #b8b8b8;
    --color-text-soft: #8f8f8f;
    --color-border: #343434;
    --color-border-subtle: #2a2a2a;
    --color-primary: #f1f1f1;
    --color-primary-hover: #ffffff;
    --color-primary-text: #111111;
    --color-secondary: #242424;
    --color-secondary-hover: #303030;
    --color-secondary-text: #eeeeee;
    --color-danger: #e05a5a;
    --color-danger-hover: #f06a6a;
    --color-danger-soft: #342020;
    --color-danger-text: #ff9999;
    --color-success: #49b77b;
    --color-info: #5a9fe5;
    --color-focus: #7da2ff;
    --shadow-surface: 0 1px 2px rgba(0, 0, 0, 0.28);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    width: 100vw;
    height: 100vh;
    min-height: 100svh;
    background-color: var(--color-page);
    color: var(--color-text);
    font-family: system-ui, sans-serif;
    font-size: 18px;
    line-height: 1.4;
    overflow: hidden;
}

.container {
    display: grid;
    grid-template-rows: auto 1fr auto;
    min-height: 100svh;
    padding: 26px;
}

.app-header,
.app-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 26px;
}

.app-footer {
    justify-content: flex-end;
}

.app-name {
    color: var(--color-text-muted);
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0;
    margin: 0;
}

.player {
    align-self: center;
    display: grid;
    gap: 34px;
    justify-items: center;
    margin-inline: auto;
    max-width: 980px;
    width: 100%;
}

.track-title {
    color: var(--color-text);
    font-size: 1.28rem;
    font-weight: 700;
    display: grid;
    line-height: 1.2;
    margin: 0;
    min-height: 1.2em;
    min-width: 15ch;
    overflow: hidden;
    position: relative;
    text-align: center;
}

.track-title-text {
    grid-area: 1 / 1;
}

.track-title-text--incoming {
    opacity: 0;
}

.controls {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
}

.transport-controls {
    display: flex;
    gap: 15px;
    justify-content: center;
    align-items: center;
}

button {
    display: grid;
    place-items: center;
    border: 1px solid var(--color-border-subtle);
    border-radius: 50%;
    box-shadow: var(--shadow-surface);
    user-select: none;
    background-color: var(--color-surface-muted);
    color: var(--color-text);
    cursor: pointer;
    font: inherit;
    font-size: 0;
    font-weight: 700;
    padding: 0;
    position: relative;
    -webkit-tap-highlight-color: transparent;
}

button:hover {
    background-color: var(--color-secondary-hover);
}

button:focus-visible {
    outline: none;
    box-shadow: var(--shadow-surface), 0 0 0 2px color-mix(in srgb, var(--color-focus) 60%, transparent);
}

button:active {
    transform: scale(0.95);
    box-shadow: none;
}

button.play {
    width: 118px;
    height: 118px;
    margin: 0;
    background-color: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-primary-text);
}

button.prev,
button.next {
    width: 60px;
    height: 60px;
    background-color: var(--color-secondary);
    color: var(--color-secondary-text);
}

.button-icon {
    display: block;
    width: 30px;
    height: 30px;
    fill: currentColor;
    pointer-events: none;
}

button.play .button-icon {
    width: 52px;
    height: 52px;
}

button.play[aria-label="Play"] .play-icon--pause,
button.play[aria-label="Pause"] .play-icon--play {
    display: none;
}

button.play[aria-label="Pause"] .play-icon--pause {
    display: block;
}

@media (max-width: 520px) {
    .container {
        padding: 18px;
    }

    .app-header {
        align-items: center;
    }

    button.play {
        height: 102px;
        width: 102px;
    }

    button.play .button-icon {
        width: 46px;
        height: 46px;
    }
}

@media (prefers-reduced-motion: no-preference) {
    body,
    button,
    input {
        transition:
            background-color 0.18s ease,
            border-color 0.18s ease,
            box-shadow 0.18s ease,
            color 0.18s ease,
            transform 0.12s ease;
    }

    .track-title.is-changing .track-title-text--current {
        animation: track-title-current-out 0.42s cubic-bezier(0.22, 1, 0.36, 1) both;
    }

    .track-title.is-changing .track-title-text--incoming {
        animation: track-title-incoming-in 0.42s cubic-bezier(0.22, 1, 0.36, 1) both;
    }

    .track-title.is-changing-next {
        --title-exit-x: -12px;
        --title-enter-x: 12px;
    }

    .track-title.is-changing-previous {
        --title-exit-x: 12px;
        --title-enter-x: -12px;
    }

    @keyframes track-title-current-out {
        0% {
            opacity: 1;
            transform: translateX(0);
        }

        58%,
        100% {
            opacity: 0;
            transform: translateX(var(--title-exit-x));
        }
    }

    @keyframes track-title-incoming-in {
        0%,
        34% {
            opacity: 0;
            transform: translateX(var(--title-enter-x));
        }

        100% {
            opacity: 1;
            transform: translateX(0);
        }
    }
}