:root {
    --primary-color: #ffffff;
    --text-color-bright: #ffffff;
    --text-color-dim: rgba(255, 255, 255, 0.8);
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --glass-shadow: rgba(0, 0, 0, 0.2);
    --accent-color: #ff4757;
    --player-height: 80px;
}

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

body,
html {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
    font-family: 'Outfit', 'Noto Sans SC', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #000;
}

/* 背景层样式 */
.bg-layer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 1;
    /* 提升到正数层级，确保在 body 背景色之上 */
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0;
    transition: opacity 1.5s ease-in-out;
}

.bg-layer.active {
    opacity: 1;
    z-index: 2;
    /* 活跃层在最上方 */
}

.bg-layer.transitioning {
    opacity: 1;
    z-index: 3;
    /* 正在淡入的层在最最前 */
}

/* 主面板样式 */
.glass-module {
    background: var(--glass-bg);
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    border: 1px solid var(--glass-border);
    border-radius: 40px;
    padding: 3rem 4rem;
    text-align: center;
    box-shadow: 0 8px 32px 0 var(--glass-shadow);
    max-width: 90vw;
    z-index: 10;
    /* 确保在背景之上 */

    opacity: 0;
    transform: translateY(20px);
    transition: opacity 1s cubic-bezier(0.23, 1, 0.32, 1), transform 1s cubic-bezier(0.23, 1, 0.32, 1);
}

.glass-module.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.glass-module {
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.mode-content {
    display: none;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.mode-content.active {
    display: block;
    opacity: 1;
}

#clock-time {
    font-size: 6rem;
    font-weight: 600;
    color: var(--text-color-bright);
    line-height: 1;
    letter-spacing: -2px;
}

@media (max-width: 600px) {
    #clock-time {
        font-size: 4rem;
    }
}

h1 {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--text-color-dim);
    letter-spacing: 0.2rem;
    margin-bottom: 1rem;
    text-transform: uppercase;
}

.counter-section {
    display: flex;
    align-items: baseline;
    justify-content: center;
    margin: 1.5rem 0;
}

#days-count {
    font-size: 8rem;
    font-weight: 600;
    color: var(--text-color-bright);
    line-height: 1;
    text-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
    letter-spacing: -3px;
}

#days-unit {
    font-size: 2rem;
    font-weight: 400;
    color: var(--text-color-dim);
    margin-left: 0.5rem;
}

footer p {
    font-size: 0.9rem;
    color: var(--text-color-dim);
    font-weight: 300;
    margin-top: 1rem;
    opacity: 0.8;
}

/* 播放器面板 */
.music-player-panel {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    width: 340px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 12px 20px;
    z-index: 20;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    transition: all 0.5s ease;
}

.track-info {
    font-size: 0.8rem;
    color: var(--text-color-dim);
    margin-bottom: 8px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    text-align: center;
}

.player-controls {
    display: flex;
    align-items: center;
    gap: 15px;
}

.player-controls button {
    background: none;
    border: none;
    color: var(--text-color-bright);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 5px;
    transition: transform 0.2s;
}

.player-controls button:hover {
    transform: scale(1.1);
}

.player-controls svg {
    width: 24px;
    height: 24px;
}

.progress-container {
    flex-grow: 1;
}

#progress-bar {
    width: 100%;
    height: 4px;
    appearance: none;
    -webkit-appearance: none;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}

#progress-bar::-webkit-slider-thumb {
    appearance: none;
    -webkit-appearance: none;
    width: 12px;
    height: 12px;
    background: var(--text-color-bright);
    border-radius: 50%;
    transition: 0.2s;
}

/* 移动端适配 */
@media (max-width: 600px) {
    .glass-module {
        padding: 2.5rem 1.5rem;
        margin-bottom: 100px;
        /* 留出播放器位置 */
    }

    #days-count {
        font-size: 5.5rem;
    }

    #days-unit {
        font-size: 1.2rem;
    }

    .music-player-panel {
        width: 85vw;
        bottom: 20px;
    }
}