/* 基本样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.47059;
    letter-spacing: -0.022em;
    color: #1d1d1f;
    background-color: #f5f5f7;
    padding-bottom: 100px; /* 为正在播放面板留空间 */
}

header {
    background: linear-gradient(135deg, #3a7bd5 0%, #64b5f6 100%);
    color: white;
    text-align: center;
    padding: 50px 0;
    margin-bottom: 40px;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(100, 181, 246, 0.2);
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('data:image/svg+xml;base64,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');
    opacity: 0.5;
}

header h1 {
    font-size: 48px;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 15px;
    position: relative;
    text-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    transform: translateY(-5px);
    opacity: 0;
    animation: fadeInDown 0.8s ease-out forwards;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.title-icon {
    margin-right: 4px;
    vertical-align: middle;
    animation: pulse 2s infinite ease-in-out;
}

@keyframes pulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
    }
}

header p {
    font-size: 20px;
    font-weight: 400;
    letter-spacing: 0.01em;
    line-height: 1.6;
    opacity: 0.92;
    max-width: 700px;
    margin: 0 auto;
    position: relative;
    transform: translateY(5px);
    opacity: 0;
    animation: fadeInUp 0.8s ease-out 0.2s forwards;
}

header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(90deg, 
        rgba(255,255,255,0.3) 0%, 
        rgba(255,255,255,0.6) 50%, 
        rgba(255,255,255,0.3) 100%);
}

@keyframes fadeInDown {
    from {
        transform: translateY(-25px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        transform: translateY(15px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.container {
    max-width: 1072px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航样式 - 最高优先级规则 */
body .container .sound-nav,
body .sound-nav,
.sound-nav {
    display: flex !important;
    flex-wrap: nowrap !important;
    overflow-x: auto !important;
    justify-content: flex-start !important;
    gap: 12px !important;
    margin: 20px 0 !important;
    position: relative !important;
    top: auto !important;
    left: auto !important;
    right: auto !important;
    background: linear-gradient(to right, var(--color-card-bg), var(--color-option-bg), var(--color-card-bg)) !important;
    padding: 18px !important;
    border-radius: var(--apple-radius) !important;
    box-shadow: 0 2px 10px var(--color-shadow) !important;
    z-index: 10 !important;
    -webkit-overflow-scrolling: touch !important;
    scrollbar-width: none !important;
    width: 100% !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
    transform: none !important;
    overflow: visible !important;
}

.sound-nav::-webkit-scrollbar {
    display: none; /* Safari and Chrome */
}

/* 移动端导航栏优化 - 最高优先级修复 */
@media (max-width: 768px) {
    body .container .sound-nav,
    body .sound-nav,
    .sound-nav {
        position: relative !important;
        top: auto !important;
        left: auto !important;
        right: auto !important;
        width: 100% !important;
        margin: 0 0 20px 0 !important;
        padding: 12px 16px !important;
        border-radius: 12px !important;
        background: var(--color-card-bg) !important;
        box-shadow: 0 2px 10px var(--color-shadow) !important;
        z-index: 10 !important;
        overflow-x: auto !important;
        -webkit-overflow-scrolling: touch !important;
        scrollbar-width: none !important;
        border: 1px solid var(--color-card-border) !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        transform: none !important;
        overflow: visible !important;
        float: none !important;
        clear: both !important;
    }
    
    .sound-nav::-webkit-scrollbar {
        display: none;
    }
    
    /* 确保导航栏在容器内正确显示 */
    .container .sound-nav {
        margin-left: 0;
        margin-right: 0;
        width: 100%;
    }
    
    /* 移除主内容区域的底部间距 */
    main {
        padding-bottom: 20px;
    }
    
    /* 调整正在播放面板位置 */
    .now-playing {
        bottom: 20px;
    }
}

.nav-btn {
    padding: 10px 18px;
    background-color: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    border: 1px solid var(--color-card-border);
    border-radius: 22px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    white-space: nowrap;
    font-size: 14px;
    color: var(--color-text);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    position: relative;
    overflow: hidden;
}

.nav-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at center, rgba(100, 181, 246, 0.2) 0%, transparent 70%);
    opacity: 0;
    transform: scale(0.5);
    transition: opacity 0.3s ease, transform 0.3s ease;
    border-radius: inherit;
    z-index: -1;
}

.nav-btn:hover {
    background-color: rgba(255, 255, 255, 0.9);
    transform: translateY(-2px);
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.08);
}

.nav-btn:hover::before {
    opacity: 1;
    transform: scale(1.5);
}

.nav-btn:active {
    transform: translateY(1px);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.nav-btn.active {
    background-color: var(--color-primary);
    color: white;
    border-color: transparent;
    box-shadow: 0 2px 8px rgba(100, 181, 246, 0.3);
    font-weight: 600;
}

.nav-btn.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 6px;
    background-color: white;
    border-radius: 50%;
    box-shadow: 0 0 5px rgba(255, 255, 255, 0.5);
}

/* 滚动按钮指示器 */
.scroll-hint {
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    background-color: rgba(255, 255, 255, 0.8);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 1px 5px rgba(0, 0, 0, 0.1);
    color: var(--color-primary);
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 10;
}

.sound-nav:hover .scroll-hint {
    opacity: 1;
}

.sound-nav.scrollable::after {
    content: '';
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    width: 30px;
    background: linear-gradient(to right, transparent, var(--color-card-bg));
    pointer-events: none;
}

/* 声音类别样式 */
.sound-category, .directory, .timer-widget {
    margin: 30px 0;
    border-radius: var(--apple-radius);
    box-shadow: 0 2px 12px var(--color-shadow);
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.42, 0, 0.58, 1);
}

.sound-category:hover, .directory:hover, .timer-widget:hover {
    box-shadow: 0 4px 18px var(--color-shadow-strong);
    transform: translateY(-1px);
}

.sound-category h2 {
    border-bottom: 2px solid #f1f3f5;
    padding-bottom: 10px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
}

.sound-category h2 i {
    margin-right: 10px;
    color: #2575fc;
}

.sound-category h2 span {
    font-size: 14px;
    font-weight: normal;
    color: #868e96;
    margin-left: 10px;
}

/* 声音选项样式优化 */
.options {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.option {
    position: relative;
    display: flex;
    flex-direction: column;
    padding: 24px;
    min-height: 160px;
    background-color: var(--color-card-bg);
    border-radius: var(--apple-radius-sm);
    transition: all 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    border: 1px solid var(--color-card-border);
    overflow: hidden;
    justify-content: space-between;
    box-shadow: 0 1px 3px var(--color-shadow);
}

/* 移动端卡片布局优化 */
@media (max-width: 768px) {
    .options {
        grid-template-columns: 1fr;
        gap: 12px;
        margin-bottom: 20px;
    }
    
    .option {
        padding: 16px;
        min-height: 140px;
        border-radius: 12px;
        box-shadow: 0 2px 8px var(--color-shadow);
    }
    
    .option:hover {
        transform: translateY(-2px);
        box-shadow: 0 4px 12px var(--color-shadow-strong);
    }
    
    .option-title {
        font-size: 16px;
        margin-bottom: 12px;
    }
    
    .option-controls {
        gap: 12px;
        margin-top: 8px;
    }
}

.option:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 25px var(--color-option-hover-shadow);
}

.option-title {
    font-weight: 600;
    font-size: 17px;
    color: var(--color-text);
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.option-controls {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 10px;
}

/* 音量滑块容器 */
.volume-container {
    display: flex;
    align-items: center;
    gap: 12px;
    position: relative;
}

/* 音量图标 */
.volume-icon {
    width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    font-size: 14px;
}

/* 音量滑块优化 */
.volume-control {
    flex: 1;
    height: 4px;
    background: var(--color-secondary);
    appearance: none;
    -webkit-appearance: none;
    outline: none;
    cursor: pointer;
    border-radius: 2px;
    transition: height 0.2s ease;
}

.volume-control:hover {
    height: 6px;
}

.volume-control::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--color-primary);
    box-shadow: 0 1px 5px rgba(0,0,0,0.15);
    cursor: pointer;
    border: 2px solid white;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    margin-top: -7px;
}

.volume-control::-webkit-slider-thumb:hover {
    transform: scale(1.15);
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

/* 音量标签 */
.volume-label {
    min-width: 54px;
    background-color: var(--color-card-bg);
    color: var(--color-text-secondary);
    font-size: 12px;
    font-weight: 500;
    border-radius: 10px;
    padding: 2px 8px;
    text-align: center;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    border: 1px solid var(--color-card-border);
}

/* 移动端音量控制优化 */
@media (max-width: 768px) {
    .volume-container {
        gap: 8px;
        margin-bottom: 8px;
    }
    
    .volume-control {
        height: 6px;
        flex: 1;
    }
    
    .volume-control::-webkit-slider-thumb {
        width: 20px;
        height: 20px;
        margin-top: -7px;
    }
    
    .volume-label {
        min-width: 40px;
        font-size: 11px;
        padding: 1px 6px;
    }
    
    .volume-icon {
        width: 14px;
        height: 14px;
        font-size: 12px;
    }
}

/* 按钮容器 */
.button-group {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 6px;
}

/* 左侧按钮组 */
.primary-buttons {
    display: flex;
    gap: 12px;
}

/* 移动端按钮组优化 */
@media (max-width: 768px) {
    .button-group {
        flex-direction: column;
        gap: 12px;
        margin-top: 8px;
    }
    
    .primary-buttons {
        justify-content: center;
        gap: 16px;
        width: 100%;
    }
    
    .volume-presets {
        justify-content: center;
        gap: 8px;
        margin-top: 8px;
    }
    
    .volume-preset-btn {
        width: 32px;
        height: 32px;
        font-size: 12px;
        border-radius: 16px;
    }
}

/* 按钮样式优化 */
.select-button, .play-button, .stop-button {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 16px;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    border: none;
    color: white;
    background-image: linear-gradient(to bottom, rgba(255,255,255,0.1) 0%, rgba(0,0,0,0.1) 100%);
    box-shadow: 0 2px 8px var(--color-shadow);
}

/* 按钮颜色 */
.select-button {
    background-color: var(--color-warning);
}

.play-button {
    background-color: var(--color-primary);
    width: 48px;
    height: 48px;
    font-size: 18px;
}

.stop-button {
    background-color: var(--color-danger);
    width: 48px;
    height: 48px;
    font-size: 18px;
}

/* 移动端按钮优化 - 简化尺寸 */
@media (max-width: 768px) {
    .select-button, .play-button, .stop-button {
        min-width: 40px;
        min-height: 40px;
        width: 40px;
        height: 40px;
        font-size: 14px;
        border-radius: 50%;
        box-shadow: 0 1px 4px var(--color-shadow);
    }
    
    .play-button, .stop-button {
        width: 44px;
        height: 44px;
        font-size: 16px;
    }
    
    /* 简化按钮点击效果 */
    .select-button:active, .play-button:active, .stop-button:active {
        transform: scale(0.98);
        transition: transform 0.1s ease;
    }
}

/* 图标设置 */
.select-button i, .play-button i, .stop-button i {
    position: relative;
    z-index: 2;
}

/* 按钮悬停效果 */
.select-button:hover, .play-button:hover, .stop-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--color-shadow-strong);
}

.select-button:active, .play-button:active, .stop-button:active {
    transform: scale(0.95) translateY(0);
}

/* 播放状态指示器 */
.option.playing {
    border-color: var(--color-primary);
    box-shadow: 0 4px 15px rgba(0, 113, 227, 0.15);
}

.option.playing::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--color-primary);
}

/* 预设音量按钮 */
.volume-presets {
    display: flex;
    gap: 6px;
    margin-top: 5px;
}

.volume-preset-btn {
    width: 26px;
    height: 26px;
    border-radius: 13px;
    background-color: var(--color-secondary);
    color: var(--color-text-secondary);
    border: none;
    font-size: 11px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.volume-preset-btn:hover {
    background-color: var(--color-primary);
    color: white;
    transform: translateY(-2px);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .option {
        padding: 20px;
        min-height: 150px;
    }
    
    .play-button, .stop-button {
        width: 44px;
        height: 44px;
    }
    
    .select-button {
        width: 38px;
        height: 38px;
    }
}

/* 收藏夹样式优化 */
.directory {
    background: var(--color-card-bg);
    border-radius: var(--apple-radius);
    padding: 24px;
}

.directory h2 {
    margin-bottom: 18px;
    color: var(--color-text);
    display: flex;
    align-items: center;
    font-size: 24px;
}

.directory h2 i {
    color: var(--color-warning);
    margin-right: 12px;
}

#favouriteSoundsList {
    list-style: none;
    margin-bottom: 20px;
    min-height: 50px;
}

#favouriteSoundsList li {
    background-color: var(--color-option-bg);
    border-radius: var(--apple-radius-sm);
    padding: 14px 16px;
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s;
    box-shadow: 0 1px 3px var(--color-shadow);
}

#favouriteSoundsList li:hover {
    transform: translateX(2px);
    box-shadow: 0 2px 6px var(--color-shadow-strong);
}

/* 收藏夹控制按钮优化 */
.favourite-controls {
    display: flex;
    gap: 10px;
    margin-top: 6px;
}

.control-btn {
    flex: 1;
    padding: 10px;
    border: none;
    border-radius: var(--apple-radius-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    font-weight: 500;
    transition: all 0.3s;
    box-shadow: 0 2px 6px var(--color-shadow);
}

/* 移动端收藏夹控制优化 */
@media (max-width: 768px) {
    .favourite-controls {
        flex-direction: column;
        gap: 8px;
        margin-top: 12px;
    }
    
    .control-btn {
        padding: 12px;
        font-size: 14px;
        min-height: 44px;
    }
    
    .control-btn:active {
        transform: scale(0.98);
        transition: transform 0.1s ease;
    }
}

.control-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px var(--color-shadow-strong);
}

#playAllButton {
    background-color: var(--color-primary);
    color: white;
}

#stopAllButton {
    background-color: var(--color-danger);
    color: white;
}

#resetAllButton {
    background-color: var(--color-secondary);
    color: var(--color-text);
}

/* 正在播放面板 */
.now-playing {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: white;
    padding: 15px;
    box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
}

.np-info {
    font-weight: 500;
}

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

#npVolume {
    width: 100px;
}

/* 移动端正在播放面板优化 */
@media (max-width: 768px) {
    .now-playing {
        padding: 12px 16px;
        background: var(--color-card-bg);
        border-top: 1px solid var(--color-card-border);
    }
    
    .np-info {
        font-size: 14px;
        flex: 1;
        margin-right: 12px;
    }
    
    .np-controls {
        gap: 8px;
        flex-shrink: 0;
    }
    
    #npVolume {
        width: 80px;
        height: 4px;
    }
    
    .np-controls button {
        width: 36px;
        height: 36px;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
    }
}

/* 浮动导航按钮 */
.floating-nav {
    position: fixed;
    right: 20px;
    bottom: 100px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 999;
}

.floating-btn {
    width: 44px;
    height: 44px;
    border-radius: 22px;
    background-color: var(--color-primary);
    color: white;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    cursor: pointer;
    box-shadow: 0 4px 12px var(--color-shadow-strong);
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.floating-btn:hover {
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 6px 16px var(--color-shadow-strong);
}

/* 移动端隐藏浮动导航按钮 */
@media (max-width: 768px) {
    .floating-nav {
        display: none !important;
    }
    
    /* 隐藏所有浮动元素 */
    .floating-btn {
        display: none !important;
    }
}

/* 移除旧的滚动按钮样式 */
.scroll-buttons {
    display: none;
}

/* 响应式设计增强 */
@media (max-width: 1024px) {
    .container {
        padding: 0 24px;
    }
    
    .options {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    header {
        padding: 20px 12px;
        margin-bottom: 15px;
    }
    
    header h1 {
        font-size: 22px;
        gap: 6px;
    }
    
    header p {
        font-size: 13px;
        padding: 0 8px;
        line-height: 1.4;
    }
    
    .options {
        grid-template-columns: 1fr;
    }
    
    /* 移除重复的导航栏规则 */
    
    .nav-btn {
        padding: 10px 16px;
        font-size: 14px;
        white-space: nowrap;
        min-height: 44px;
        border-radius: 22px;
    }
    
    .help-sidebar.open .help-content {
        width: 280px;
    }
    
    .help-toggle {
        width: 40px;
        height: 40px;
    }
    
    .floating-nav {
        right: 16px;
        bottom: 80px;
    }
    
    /* 优化容器间距 */
    .container {
        padding: 0 16px;
    }
    
    /* 优化卡片间距 */
    .sound-category, .directory, .timer-widget {
        margin-bottom: 16px;
        padding: 20px;
    }
    
    /* 优化双列容器 */
    .dual-container {
        gap: 16px;
        margin: 20px 0;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 28px;
    }
    
    .theme-toggle {
        width: 32px;
        height: 32px;
        font-size: 14px;
    }
    
    .sound-category, .directory, .timer-widget {
        padding: 18px;
    }
    
    .help-sidebar.open .help-content {
        width: 85vw;
    }
    
    .floating-btn {
        width: 40px;
        height: 40px;
        font-size: 16px;
    }
}

/* 为极小屏幕优化布局 */
@media (max-width: 320px) {
    /* 移除重复的导航栏规则 */
    
    .nav-btn {
        padding: 8px 12px;
        font-size: 12px;
        min-height: 40px;
    }
    
    .timer-presets {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .timer-preset-btn {
        padding: 8px 6px;
        font-size: 12px;
        min-height: 40px;
    }
    
    .option {
        padding: 12px;
        min-height: 120px;
    }
    
    .option-title {
        font-size: 14px;
    }
    
    .primary-buttons {
        gap: 12px;
    }
    
    .select-button, .play-button, .stop-button {
        width: 40px;
        height: 40px;
        font-size: 14px;
    }
    
    .play-button, .stop-button {
        width: 44px;
        height: 44px;
        font-size: 16px;
    }
    
    header h1 {
        font-size: 24px;
    }
    
    header p {
        font-size: 13px;
    }
    
    .container {
        padding: 0 12px;
    }
    
    .sound-category, .directory, .timer-widget {
        padding: 16px;
        margin-bottom: 12px;
    }
}

/* 主题变量 - 白天模式 */
:root {
    --color-bg: #f8f9fa;
    --color-card-bg: #ffffff;
    --color-text: #2c3e50;
    --color-text-secondary: #7f8c8d;
    --color-primary: #64b5f6;
    --color-primary-hover: #90caf9;
    --color-secondary: #f1f8e9;
    --color-card-border: #eceff1;
    --color-option-bg: #f5fbff;
    --color-option-hover-shadow: rgba(100, 181, 246, 0.1);
    --color-header-bg: linear-gradient(135deg, #bbdefb 0%, #b3e5fc 100%);
    --color-header-text: #37474f;
    --color-shadow: rgba(0, 0, 0, 0.05);
    --color-shadow-strong: rgba(0, 0, 0, 0.08);
    --color-danger: #ef9a9a;
    --color-warning: #ffca28;
    --color-success: #a5d6a7;
    --color-toast-bg: rgba(55, 71, 79, 0.9);
    --color-toast-text: white;
    --transition-time: 0.3s;
    --apple-radius: 12px;
    --apple-radius-sm: 8px;
}

/* 夜晚模式变量 */
[data-theme="dark"] {
    --color-bg: #263238;
    --color-card-bg: #37474f;
    --color-text: #eceff1;
    --color-text-secondary: #b0bec5;
    --color-primary: #64b5f6;
    --color-primary-hover: #90caf9;
    --color-secondary: #2c3e50;
    --color-card-border: #455a64;
    --color-option-bg: #3d5a6c;
    --color-option-hover-shadow: rgba(100, 181, 246, 0.2);
    --color-header-bg: linear-gradient(135deg, #3d5a6c 0%, #455a64 100%);
    --color-header-text: #eceff1;
    --color-shadow: rgba(0, 0, 0, 0.2);
    --color-shadow-strong: rgba(0, 0, 0, 0.3);
}

/* 应用变量到现有样式 */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.47059;
    letter-spacing: -0.022em;
    color: var(--color-text);
    background-color: var(--color-bg);
    padding-bottom: 100px;
    transition: background-color 0.5s ease, color 0.5s ease;
}

header {
    background: var(--color-header-bg);
    color: var(--color-header-text);
    text-align: center;
    padding: 40px 0;
    margin-bottom: 30px;
}

/* 主题切换按钮样式 */
.theme-toggle {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--color-secondary);
    color: var(--color-text);
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 16px;
    box-shadow: 0 2px 6px var(--color-shadow);
}

.theme-toggle:hover {
    background-color: var(--color-card-border);
    transform: scale(1.05);
}

/* 更新声音导航栏样式 */
/* 移除重复的导航栏规则 */

.nav-btn {
    background-color: var(--color-secondary);
    color: var(--color-text);
    transition: background-color var(--transition-time), color var(--transition-time);
}

.nav-btn:hover {
    background-color: var(--color-primary);
    color: white;
}

.nav-btn.active {
    background-color: var(--color-primary);
    color: white;
}

/* 更新声音类别和选项样式 */
.sound-category {
    background: var(--color-card-bg);
    box-shadow: 0 2px 10px var(--color-shadow);
    transition: background-color var(--transition-time), box-shadow var(--transition-time);
}

.sound-category h2 {
    border-bottom: 2px solid var(--color-secondary);
    color: var(--color-text);
    transition: color var(--transition-time), border-color var(--transition-time);
}

.sound-category h2 i {
    color: var(--color-primary);
    transition: color var(--transition-time);
}

.sound-category h2 span {
    color: var(--color-text-secondary);
    transition: color var(--transition-time);
}

.option {
    background-color: var(--color-option-bg);
    border: 1px solid var(--color-card-border);
    color: var(--color-text);
    transition: background-color var(--transition-time), border-color var(--transition-time), color var(--transition-time), transform var(--transition-time), box-shadow var(--transition-time);
}

.option:hover {
    box-shadow: 0 5px 15px var(--color-option-hover-shadow);
}

/* 更新按钮样式 */
.select-button {
    background-color: var(--color-secondary);
    color: var(--color-text);
    transition: background-color var(--transition-time), color var(--transition-time);
}

.play-button {
    background-color: var(--color-primary);
    transition: background-color var(--transition-time);
}

.stop-button {
    background-color: var(--color-danger);
    transition: background-color var(--transition-time);
}

/* 更新音量控制条样式 */
.volume-control {
    background: var(--color-secondary);
    transition: background var(--transition-time);
}

.volume-control::-webkit-slider-thumb {
    background: var(--color-primary);
    transition: background var(--transition-time);
}

/* 更新收藏夹样式 */
.directory {
    background: var(--color-card-bg);
    box-shadow: 0 2px 10px var(--color-shadow);
    transition: background-color var(--transition-time), box-shadow var(--transition-time);
}

.directory h2 {
    color: var(--color-text);
    transition: color var(--transition-time);
}

.directory h2 i {
    color: var(--color-warning);
    transition: color var(--transition-time);
}

#favouriteSoundsList li {
    background-color: var(--color-option-bg);
    color: var(--color-text);
    transition: background-color var(--transition-time), color var(--transition-time);
}

#playAllButton {
    background-color: var(--color-primary);
    transition: background-color var(--transition-time);
}

#stopAllButton {
    background-color: var(--color-danger);
    transition: background-color var(--transition-time);
}

#resetAllButton {
    background-color: var(--color-secondary);
    color: var(--color-text);
    transition: background-color var(--transition-time), color var(--transition-time);
}

/* 更新正在播放面板样式 */
.now-playing {
    background: var(--color-card-bg);
    color: var(--color-text);
    box-shadow: 0 -2px 10px var(--color-shadow);
    transition: background-color var(--transition-time), color var(--transition-time), box-shadow var(--transition-time);
}

/* 更新浮动导航按钮样式 */
.floating-btn {
    background-color: var(--color-primary);
    transition: background-color var(--transition-time), transform var(--transition-time), box-shadow var(--transition-time);
}

.floating-btn:hover {
    background-color: var(--color-primary-hover);
}

/* 倒计时小工具样式优化 */
.timer-widget {
    background: var(--color-card-bg);
    border-radius: var(--apple-radius);
    padding: 24px;
}

.timer-widget h2 {
    color: var(--color-text);
    margin-bottom: 18px;
    display: flex;
    align-items: center;
    font-size: 24px;
}

.timer-widget h2 i {
    color: var(--color-primary);
    margin-right: 12px;
}

.timer-display {
    font-size: 28px;
    font-weight: 600;
    text-align: center;
    color: var(--color-text);
    padding: 16px 10px;
    background-color: var(--color-option-bg);
    border-radius: var(--apple-radius-sm);
    letter-spacing: -0.03em;
    box-shadow: inset 0 1px 3px var(--color-shadow);
}

.timer-controls {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 16px;
}

.timer-presets {
    display: flex;
    justify-content: space-between;
    gap: 6px;
}

.timer-preset-btn {
    flex: 1;
    padding: 10px 0;
    background-color: var(--color-secondary);
    color: var(--color-text);
    border: none;
    border-radius: var(--apple-radius-sm);
    cursor: pointer;
    transition: all 0.3s;
    font-weight: 500;
}

/* 移动端计时器优化 - 简化布局 */
@media (max-width: 768px) {
    .timer-display {
        font-size: 20px;
        padding: 12px 8px;
        margin-bottom: 12px;
    }
    
    .timer-presets {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 6px;
        margin-bottom: 10px;
    }
    
    .timer-preset-btn {
        padding: 8px 6px;
        font-size: 13px;
        min-height: 40px;
    }
    
    .timer-custom {
        display: flex;
        gap: 6px;
        margin-bottom: 10px;
    }
    
    .timer-custom input {
        flex: 1;
        padding: 8px;
        border-radius: 6px;
        border: 1px solid var(--color-card-border);
        font-size: 13px;
        min-height: 40px;
    }
    
    .timer-custom button {
        padding: 8px 12px;
        min-height: 40px;
        font-size: 13px;
    }
    
    .timer-action-btn {
        width: 100%;
        padding: 10px;
        min-height: 40px;
        font-size: 13px;
    }
}

.timer-preset-btn:hover, .timer-preset-btn.active {
    background-color: var(--color-primary);
    color: white;
    transform: translateY(-1px);
}

/* 页脚样式 */
.site-footer {
    background: var(--color-bg);
    padding: 40px 0 20px;
    margin-top: 60px;
    border-top: 1px solid var(--color-card-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-logo {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-text);
}

.footer-links {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}

.footer-link {
    color: var(--color-primary);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s;
    display: flex;
    align-items: center;
    gap: 6px;
}

.footer-link:hover {
    color: var(--color-primary-hover);
    text-decoration: none;
}

.footer-legal {
    display: flex;
    justify-content: space-between;
    border-top: 1px solid var(--color-card-border);
    padding-top: 20px;
    font-size: 12px;
    color: var(--color-text-secondary);
}

@media (max-width: 640px) {
    .footer-content {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .footer-legal {
        flex-direction: column;
        gap: 8px;
    }
}

/* 帮助指南侧边栏样式优化 */
.help-sidebar {
    position: fixed;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    z-index: 998;
    display: flex;
}

.help-toggle {
    width: 44px;
    height: 44px;
    border: none;
    background-color: var(--color-primary);
    color: white;
    border-radius: 22px 0 0 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 20px;
    box-shadow: -2px 0 12px var(--color-shadow-strong);
    transition: all 0.3s;
}

.help-toggle:hover {
    width: 48px;
    background-color: var(--color-primary-hover);
}

.help-content {
    width: 0;
    height: 500px;
    overflow-y: auto;
    background-color: var(--color-card-bg);
    border-radius: 12px 0 0 12px;
    box-shadow: -2px 0 12px var(--color-shadow-strong);
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    visibility: hidden;
    padding: 0;
}

.help-sidebar.open .help-content {
    width: 340px;
    opacity: 1;
    visibility: visible;
    padding: 24px;
}

/* 移动端帮助侧边栏优化 - 改为更简洁的显示方式 */
@media (max-width: 768px) {
    .help-sidebar {
        position: fixed;
        right: auto;
        left: 0;
        top: auto;
        bottom: 0;
        transform: none;
        width: 100%;
        z-index: 1001;
    }
    
    .help-toggle {
        position: fixed;
        bottom: 15px;
        right: 15px;
        width: 45px;
        height: 45px;
        border-radius: 50%;
        box-shadow: 0 2px 8px var(--color-shadow-strong);
        z-index: 1002;
        background-color: var(--color-primary);
        color: white;
        border: none;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 18px;
    }
    
    .help-content {
        width: 100%;
        height: 0;
        border-radius: 16px 16px 0 0;
        transform: translateY(100%);
        transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
        background-color: var(--color-card-bg);
        box-shadow: 0 -4px 20px var(--color-shadow-strong);
    }
    
    .help-sidebar.open .help-content {
        height: 50vh;
        transform: translateY(0);
        padding: 20px 16px;
        max-height: 50vh;
    }
}

.help-content h3 {
    margin-top: 0;
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--color-card-border);
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 22px;
}

.help-step {
    display: flex;
    margin-bottom: 24px;
    position: relative;
}

.step-number {
    flex: 0 0 32px;
    height: 32px;
    background-color: var(--color-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    margin-right: 16px;
    position: relative;
    z-index: 2;
}

.help-step:not(:last-child)::after {
    content: '';
    position: absolute;
    left: 16px;
    top: 32px;
    bottom: -12px;
    width: 1px;
    background-color: var(--color-card-border);
    z-index: 1;
}

.step-content {
    flex: 1;
}

.step-content h4 {
    margin-top: 0;
    margin-bottom: 8px;
    color: var(--color-text);
    transition: color var(--transition-time);
}

.step-content p {
    margin: 0;
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--color-text-secondary);
    transition: color var(--transition-time);
}

.help-tip {
    margin-top: 30px;
    padding: 15px;
    background-color: var(--color-option-bg);
    border-radius: 8px;
    border-left: 4px solid var(--color-warning);
    display: flex;
    gap: 10px;
    align-items: flex-start;
    transition: background-color var(--transition-time);
}

.help-tip i {
    color: var(--color-warning);
    font-size: 20px;
    margin-top: 2px;
}

.help-tip p {
    margin: 0;
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--color-text);
    transition: color var(--transition-time);
}

/* 自定义滚动条样式 */
.help-content::-webkit-scrollbar {
    width: 6px;
}

.help-content::-webkit-scrollbar-track {
    background: transparent;
}

.help-content::-webkit-scrollbar-thumb {
    background-color: var(--color-secondary);
    border-radius: 3px;
}

.help-content::-webkit-scrollbar-thumb:hover {
    background-color: var(--color-primary);
}

/* 在移动设备上调整帮助栏样式 */
@media (max-width: 768px) {
    .help-sidebar.open .help-content {
        width: 260px;
    }
    
    .help-toggle {
        width: 40px;
        height: 40px;
        font-size: 20px;
    }
}

/* 屏幕阅读器专用样式 */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* 改进键盘焦点样式 */
*:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* 高对比度模式支持 */
@media (prefers-contrast: more) {
    :root {
        --color-primary: #0000FF;
        --color-text: #000000;
        --color-bg: #FFFFFF;
        --color-card-bg: #FFFFFF;
        --color-card-border: #000000;
    }
    
    [data-theme="dark"] {
        --color-primary: #00FFFF;
        --color-text: #FFFFFF;
        --color-bg: #000000;
        --color-card-bg: #000000;
        --color-card-border: #FFFFFF;
    }
}

/* 跳过导航链接样式 */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: white;
    padding: 8px;
    z-index: 9999;
    transition: top 0.3s;
}

.skip-link:focus {
    top: 0;
}

/* 旧版浏览器回退方案 */
body {
    background-color: #f8f9fa;
    background-color: var(--color-bg, #f8f9fa);
    color: #333;
    color: var(--color-text, #333);
    transition: background-color 0.3s, color 0.3s;
    transition: background-color var(--transition-time, 0.3s), color var(--transition-time, 0.3s);
}

h1, h2, h3, h4 {
    font-weight: 600;
}

/* Apple 风格平滑动画 */
.theme-switch-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.1);
    z-index: 9999;
    pointer-events: none;
    opacity: 1;
    animation: fadeOut 0.5s cubic-bezier(0.215, 0.61, 0.355, 1) forwards;
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; }
}

/* 按钮点击效果 */
button:active:not(:disabled) {
    transform: scale(0.96);
}

/* 平滑过渡 */
* {
    transition-timing-function: cubic-bezier(0.28, 0.11, 0.32, 1);
}

/* 通知样式优化 */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 12px 20px;
    border-radius: 40px;
    font-size: 15px;
    opacity: 0;
    transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 2000;
    text-align: center;
    min-width: 200px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* 改进排版 */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    line-height: 1.47059;
    letter-spacing: -0.022em;
    background-color: var(--color-bg);
    color: var(--color-text);
    transition: background-color 0.5s ease, color 0.5s ease;
    padding-bottom: 120px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 改进标题排版 */
h1, h2, h3, h4 {
    font-weight: 600;
    letter-spacing: -0.025em;
}

.sound-category h2, .directory h2, .timer-widget h2 {
    font-size: 24px;
    margin-bottom: 20px;
    color: var(--color-text);
    letter-spacing: -0.025em;
    display: flex;
    align-items: center;
    gap: 10px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--color-card-border);
}

/* 优化卡片样式 */
.sound-category, .directory, .timer-widget {
    background: var(--color-card-bg);
    padding: 28px;
    margin: 32px 0;
    border-radius: var(--apple-radius);
    box-shadow: 0 4px 20px var(--color-shadow);
    overflow: hidden;
    transition: all 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.sound-category:hover, .directory:hover, .timer-widget:hover {
    box-shadow: 0 8px 30px var(--color-shadow-strong);
    transform: translateY(-3px);
}

/* 声音选项精细调整 */
.option {
    background-color: var(--color-card-bg);
    border-radius: var(--apple-radius-sm);
    padding: 22px;
    display: flex;
    flex-direction: column;
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    position: relative;
    border: 1px solid var(--color-card-border);
}

.option:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 25px var(--color-option-hover-shadow);
}

.option-title {
    font-weight: 500;
    margin-bottom: 18px;
    font-size: 17px;
    color: var(--color-text);
}

/* 优化页脚样式 */
.site-footer {
    background: var(--color-bg);
    padding: 40px 0 30px;
    margin-top: 80px;
    border-top: 1px solid var(--color-card-border);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
    gap: 24px;
}

.footer-logo {
    font-size: 22px;
    font-weight: 600;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.footer-links {
    display: flex;
    gap: 28px;
    flex-wrap: wrap;
}

.footer-link {
    color: var(--color-primary);
    text-decoration: none;
    font-size: 15px;
    transition: color 0.3s, transform 0.3s;
    display: flex;
    align-items: center;
    gap: 8px;
}

.footer-link:hover {
    color: var(--color-primary-hover);
    transform: translateY(-2px);
}

.footer-legal {
    display: flex;
    justify-content: center;
    padding-top: 20px;
    border-top: 1px solid var(--color-card-border);
}

.copyright {
    font-size: 13px;
    color: var(--color-text-secondary);
    text-align: center;
}

/* 优化导航栏 - 移除重复的sticky定位 */

.nav-btn {
    padding: 10px 18px;
    background-color: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    border: 1px solid var(--color-card-border);
    border-radius: 22px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    white-space: nowrap;
    font-size: 14px;
    color: var(--color-text);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    position: relative;
    overflow: hidden;
}

.nav-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at center, rgba(100, 181, 246, 0.2) 0%, transparent 70%);
    opacity: 0;
    transform: scale(0.5);
    transition: opacity 0.3s ease, transform 0.3s ease;
    border-radius: inherit;
    z-index: -1;
}

.nav-btn:hover {
    background-color: rgba(255, 255, 255, 0.9);
    transform: translateY(-2px);
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.08);
}

.nav-btn:hover::before {
    opacity: 1;
    transform: scale(1.5);
}

.nav-btn:active {
    transform: translateY(1px);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.nav-btn.active {
    background-color: var(--color-primary);
    color: white;
    border-color: transparent;
    box-shadow: 0 2px 8px rgba(100, 181, 246, 0.3);
    font-weight: 600;
}

.nav-btn.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 6px;
    height: 6px;
    background-color: white;
    border-radius: 50%;
    box-shadow: 0 0 5px rgba(255, 255, 255, 0.5);
}

/* 优化按钮样式 */
.select-button, .play-button, .stop-button, .timer-preset-btn, #startTimerBtn, #cancelTimerBtn, #setCustomTimer {
    padding: 10px 16px;
    border: none;
    border-radius: 22px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    box-shadow: 0 2px 6px var(--color-shadow);
}

.select-button:hover, .play-button:hover, .stop-button:hover, 
.timer-preset-btn:hover, #startTimerBtn:hover, #cancelTimerBtn:hover, #setCustomTimer:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px var(--color-shadow-strong);
}

.play-button, #startTimerBtn, #playAllButton {
    background-color: var(--color-primary);
    color: white;
    box-shadow: 0 2px 8px rgba(0, 113, 227, 0.25);
}

.play-button:hover, #startTimerBtn:hover, #playAllButton:hover {
    background-color: var(--color-primary-hover);
    box-shadow: 0 4px 15px rgba(0, 113, 227, 0.35);
}

/* 收藏夹项目美化 */
#favouriteSoundsList li {
    background-color: var(--color-option-bg);
    border-radius: var(--apple-radius-sm);
    padding: 16px 20px;
    margin-bottom: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    box-shadow: 0 2px 8px var(--color-shadow);
}

#favouriteSoundsList li:hover {
    transform: translateX(4px);
    box-shadow: 0 4px 12px var(--color-shadow-strong);
}

/* 倒计时器美化 */
.timer-display {
    font-size: 32px;
    font-weight: 600;
    text-align: center;
    color: var(--color-text);
    padding: 20px 10px;
    background-color: var(--color-option-bg);
    border-radius: var(--apple-radius-sm);
    letter-spacing: -0.03em;
    box-shadow: inset 0 2px 5px var(--color-shadow);
    margin-bottom: 20px;
}

/* 优化响应式设计 */
@media (max-width: 768px) {
    .sound-category, .directory, .timer-widget {
        padding: 22px;
    }
    
    .option {
        padding: 18px;
    }
    
    .sound-nav {
        padding: 14px 16px;
        border-radius: 25px;
    }
    
    .footer-content {
        justify-content: center;
        text-align: center;
    }
    
    .footer-links {
        justify-content: center;
    }
}

/* 动画效果增强 */
@keyframes gentle-pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.03); }
    100% { transform: scale(1); }
}

.option:hover .play-button {
    animation: gentle-pulse 1.5s infinite;
}

/* 精细化渐变背景 */
header {
    background: var(--color-header-bg);
    position: relative;
    overflow: hidden;
}

header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('data:image/svg+xml;base64,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');
    opacity: 0.5;
}

header h1, header p {
    position: relative;
    z-index: 2;
}

/* 并排容器样式 */
.dual-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin: 32px 0;
}

/* 调整左右容器的样式 */
.dual-container .directory,
.dual-container .timer-widget {
    margin: 0; /* 移除顶部和底部边距，因为现在由 dual-container 控制 */
    height: 100%; /* 确保两个容器高度一致 */
    display: flex;
    flex-direction: column;
}

/* 确保 favorites 列表填充空间 */
#favouriteSoundsList {
    flex-grow: 1;
    overflow-y: auto;
    min-height: 100px;
    max-height: 350px;
    scrollbar-width: thin;
    scrollbar-color: var(--color-primary) var(--color-secondary);
}

#favouriteSoundsList::-webkit-scrollbar {
    width: 6px;
}

#favouriteSoundsList::-webkit-scrollbar-track {
    background: var(--color-secondary);
    border-radius: 3px;
}

#favouriteSoundsList::-webkit-scrollbar-thumb {
    background-color: var(--color-primary);
    border-radius: 3px;
}

/* 调整按钮组 */
.favourite-controls {
    margin-top: auto; /* 将控件推到底部 */
    padding-top: 20px;
}

/* 调整计时器内部布局 */
.timer-widget .timer-display {
    margin-bottom: 25px;
}

.timer-widget .timer-controls {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

/* 响应式设计 - 平板和手机 */
@media (max-width: 992px) {
    .dual-container {
        grid-template-columns: 1fr; /* 在小屏幕上改为垂直排列 */
        gap: 20px;
    }
    
    .dual-container .directory,
    .dual-container .timer-widget {
        width: 100%;
    }
    
    #favouriteSoundsList {
        max-height: 250px; /* 在小屏幕上减少最大高度 */
    }
}

/* 对于特小屏幕的额外优化 */
@media (max-width: 480px) {
    #favouriteSoundsList {
        max-height: 200px;
    }
}

/* 为左右容器添加微妙的区分样式 */
.dual-container .directory {
    border-left: 4px solid rgba(255, 202, 40, 0.7);
    background: linear-gradient(145deg, var(--color-card-bg) 0%, var(--color-secondary) 100%);
}

.dual-container .timer-widget {
    border-left: 4px solid rgba(100, 181, 246, 0.7);
    background: linear-gradient(145deg, var(--color-card-bg) 0%, var(--color-option-bg) 100%);
}

/* 添加过渡效果 */
.dual-container .directory,
.dual-container .timer-widget {
    transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.dual-container .directory:hover {
    border-left-width: 6px;
}

.dual-container .timer-widget:hover {
    border-left-width: 6px;
}

/* 标题样式统一 */
.dual-container h2 {
    padding-bottom: 15px;
    margin-bottom: 20px;
    font-size: 22px;
}

.dual-container h2 i {
    margin-right: 10px;
}

/* 为空收藏夹添加提示样式 */
#favouriteSoundsList:empty::before {
    content: 'No favorites yet. Select sounds to add them here.';
    display: block;
    padding: 20px;
    text-align: center;
    color: var(--color-text-secondary);
    font-style: italic;
}

/* 音量预设按钮活动状态 */
.volume-preset-btn.active {
    background-color: var(--color-primary);
    color: white;
    box-shadow: 0 2px 6px rgba(0, 113, 227, 0.3);
    transform: translateY(-2px);
}

/* 音量图标提示 */
.volume-icon {
    cursor: pointer;
    transition: transform 0.2s ease;
}

.volume-icon:hover {
    transform: scale(1.15);
    color: var(--color-primary);
}

.volume-icon:active {
    transform: scale(0.95);
}

/* 优化播放按钮状态 */
.play-button:focus, 
.stop-button:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.4), 0 2px 8px var(--color-shadow);
}

/* 播放状态增强视觉反馈 */
.option.playing .play-button,
.option.playing .stop-button {
    box-shadow: 0 0 10px rgba(0, 113, 227, 0.6);
}

/* 悬停时的波纹效果 */
@keyframes ripple {
    0% { box-shadow: 0 0 0 0 rgba(0, 113, 227, 0.3); }
    100% { box-shadow: 0 0 0 15px rgba(0, 113, 227, 0); }
}

.play-button:hover {
    animation: ripple 1.5s infinite;
}

/* 波纹动画调整为更柔和的效果 */
@keyframes gentle-ripple {
    0% { box-shadow: 0 0 0 0 rgba(100, 181, 246, 0.3); }
    100% { box-shadow: 0 0 0 18px rgba(100, 181, 246, 0); }
}

.play-button:hover {
    animation: gentle-ripple 2s infinite;
}

/* 声音类别标题美化 */
.sound-category h2 {
    background: linear-gradient(to right, rgba(100, 181, 246, 0.1), transparent);
    padding: 15px;
    border-radius: var(--apple-radius-sm);
    border-bottom: 2px solid rgba(100, 181, 246, 0.2);
    color: var(--color-text);
}

/* 自定义提示样式 */
#custom-alert {
    font-size: 14px;
    font-weight: 500;
    max-width: 80%;
    text-align: center;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    animation: alertPopup 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    line-height: 1.5;
    padding: 12px 24px !important;
    background: rgba(55, 71, 79, 0.95) !important;
    border-left: 4px solid var(--color-primary) !important;
}

@keyframes alertPopup {
    0% { transform: translateX(-50%) translateY(-20px); opacity: 0; }
    100% { transform: translateX(-50%) translateY(0); opacity: 1; }
}

/* 添加一个新的涟漪动画 */
@keyframes nav-ripple {
    to {
        transform: scale(2);
        opacity: 0;
    }
}

/* 为刚添加的按钮添加特殊效果 */
.nav-btn.new::after {
    content: '';
    position: absolute;
    top: -4px;
    right: -4px;
    width: 8px;
    height: 8px;
    background-color: var(--color-warning);
    border-radius: 50%;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.5); opacity: 0.7; }
    100% { transform: scale(1); opacity: 1; }
}

/* 页面初始加载动画 */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.content-container {
    animation: fadeIn 0.8s ease-out;
}

/* 骨架屏效果 */
.skeleton-loader {
    background: linear-gradient(90deg, 
        var(--color-card-bg) 0%, 
        var(--color-option-bg) 50%, 
        var(--color-card-bg) 100%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
    border-radius: var(--apple-radius-sm);
    height: 150px;
    margin-bottom: 20px;
}

@keyframes skeleton-loading {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* 移动端优化 */
@media (max-width: 768px) {
    /* 减小初始加载时的动画数量 */
    .page-loading .option {
        animation: none !important;
        transform: none !important;
    }
    
    /* 优化首屏加载 */
    .sound-category:not(:first-child) {
        opacity: 0.8;
    }
    
    .page-loaded .sound-category:not(:first-child) {
        opacity: 1;
        transition: opacity 0.5s ease;
    }
}

/* 初始加载状态 */
.page-loading {
    overflow-y: hidden;
}

.page-loading::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-bg);
    opacity: 0;
    z-index: -1;
}

.page-loaded .container {
    opacity: 1;
}

/* 首屏内容优化 */
.first-fold {
    min-height: 75vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

/* 优化首页关键内容 */
#white-noise {
    box-shadow: 0 5px 25px var(--color-shadow-strong);
    transform: translateY(-5px);
    transition: all 0.4s ease;
}

/* 提示文本 */
.initial-hint {
    text-align: center;
    padding: 15px;
    margin: 20px 0 30px;
    color: var(--color-text-secondary);
    font-size: 16px;
    opacity: 0;
    animation: fadeIn 1s 0.5s ease forwards;
}

.initial-hint i {
    margin-right: 8px;
    color: var(--color-primary);
}

/* 移动端响应式优化 */
@media screen and (max-width: 768px) {
    /* 头部样式优化 */
    header {
        padding: 30px 15px;
    }

    header h1 {
        font-size: 32px;
        gap: 8px;
    }

    header p {
        font-size: 16px;
        padding: 0 15px;
    }

    /* 导航栏优化 - 移除重复规则 */

    .nav-btn {
        padding: 8px 14px;
        font-size: 13px;
        white-space: nowrap;
    }

    /* 双列容器优化 */
    .dual-container {
        flex-direction: column;
        gap: 20px;
    }

    .directory, .timer-widget {
        width: 100%;
        margin: 0;
    }

    /* 声音卡片优化 */
    .option {
        padding: 12px;
        margin-bottom: 8px;
    }

    .option-title {
        font-size: 15px;
    }

    .button-group {
        gap: 8px;
    }

    .control-btn {
        padding: 8px 12px;
        font-size: 13px;
    }

    /* 音量控制优化 */
    .volume-container {
        margin: 8px 0;
    }

    .volume-control {
        height: 24px;
        width: 100%;
    }

    /* 底部播放面板优化 */
    .now-playing {
        padding: 12px;
    }

    .np-info {
        font-size: 14px;
    }

    .np-controls {
        gap: 8px;
    }

    /* 帮助侧边栏优化 */
    .help-sidebar {
        bottom: 80px;
    }

    .help-content {
        width: 90%;
        max-width: 320px;
    }

    /* 浮动导航按钮优化 */
    .floating-nav {
        bottom: 80px;
        right: 15px;
    }

    .floating-btn {
        width: 40px;
        height: 40px;
    }

    /* 页脚优化 */
    .site-footer {
        padding: 20px 15px;
    }

    .footer-content {
        flex-direction: column;
        gap: 15px;
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 12px;
    }

    /* 触摸优化 */
    button, .control-btn, .nav-btn {
        min-height: 44px;
        min-width: 44px;
    }

    input[type="range"] {
        height: 24px;
    }

    /* 间距优化 */
    .container {
        padding: 0 15px;
    }

    section {
        margin-bottom: 25px;
    }

    /* 提示文本优化 */
    .initial-hint {
        font-size: 14px;
        padding: 10px 15px;
        margin: 15px 0;
    }

    /* 收藏夹控制按钮优化 */
    .favourite-controls {
        flex-wrap: wrap;
        gap: 8px;
    }

    .favourite-controls .control-btn {
        flex: 1;
        min-width: 100px;
    }

    /* 睡眠计时器优化 */
    .timer-content {
        padding: 15px;
    }

    .timer-display {
        font-size: 24px;
    }

    .timer-presets {
        gap: 6px;
    }

    .timer-preset-btn {
        padding: 6px 12px;
        font-size: 13px;
    }

    .timer-custom {
        flex-direction: column;
        gap: 8px;
    }

    .timer-custom input {
        width: 100%;
        padding: 8px;
    }
}

/* 添加触摸反馈效果 */
@media (hover: none) {
    .nav-btn:active,
    .control-btn:active,
    .timer-preset-btn:active {
        transform: scale(0.98);
        background-color: rgba(0, 0, 0, 0.05);
    }
}

/* 优化深色模式下的移动端显示 */
@media (prefers-color-scheme: dark) and (max-width: 768px) {
    .nav-btn:active,
    .control-btn:active,
    .timer-preset-btn:active {
        background-color: rgba(255, 255, 255, 0.1);
    }
}

/* Sitemap页面样式 */
.sitemap-section {
    background: var(--color-card-bg);
    border-radius: var(--apple-radius);
    padding: 24px;
    margin-bottom: 24px;
    box-shadow: 0 2px 12px var(--color-shadow);
    transition: all 0.3s ease;
}

.sitemap-section:hover {
    box-shadow: 0 4px 18px var(--color-shadow-strong);
    transform: translateY(-2px);
}

.sitemap-section h2 {
    color: var(--color-text);
    font-size: 20px;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--color-card-border);
}

.sitemap-section h2 i {
    color: var(--color-primary);
    font-size: 18px;
}

.sitemap-section ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
}

.sitemap-section li {
    margin: 0;
}

.sitemap-section a {
    color: var(--color-text);
    text-decoration: none;
    font-size: 14px;
    padding: 8px 12px;
    border-radius: var(--apple-radius-sm);
    display: block;
    transition: all 0.2s ease;
    background: var(--color-option-bg);
}

.sitemap-section a:hover {
    color: var(--color-primary);
    background: var(--color-secondary);
    transform: translateX(4px);
}

/* 移动端优化 */
@media (max-width: 768px) {
    .sitemap-section {
        padding: 16px;
    }

    .sitemap-section h2 {
        font-size: 18px;
    }

    .sitemap-section ul {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .sitemap-section a {
        padding: 10px 12px;
        font-size: 15px;
    }
}

/* 移动端导航栏优化 - 移除重复样式，使用顶部粘性导航 */
@media (max-width: 768px) {
    .volume-control {
        flex: 1;
        height: 4px;
    }

    .volume-label {
        min-width: 40px;
        font-size: 12px;
    }

    /* 优化收藏夹和计时器布局 */
    .dual-container {
        flex-direction: column;
        gap: 16px;
    }

    .directory, .timer-widget {
        width: 100%;
        margin: 0;
    }

    /* 优化正在播放面板 */
    .now-playing {
        bottom: 70px;
        left: 0;
        right: 0;
        padding: 12px;
        background: var(--card-bg);
        box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
    }

    .np-controls {
        display: flex;
        align-items: center;
        gap: 12px;
    }

    #npVolume {
        flex: 1;
    }

    /* 优化帮助侧边栏 */
    .help-sidebar {
        bottom: 70px;
    }

    .help-content {
        max-height: 80vh;
    }

    /* 优化浮动按钮 */
    .floating-nav {
        bottom: 70px;
        right: 16px;
    }

    .floating-btn {
        width: 40px;
        height: 40px;
        margin: 8px 0;
    }
}

/* 添加触摸反馈效果 */
@media (hover: none) {
    .nav-btn:active,
    .select-button:active,
    .play-button:active,
    .stop-button:active,
    .control-btn:active {
        transform: scale(0.95);
    }
}

/* 深色模式优化 */
@media (prefers-color-scheme: dark) and (max-width: 768px) {
    .nav-btn:active,
    .select-button:active,
    .play-button:active,
    .stop-button:active,
    .control-btn:active {
        background: var(--primary-color);
    }
}

/* 移动端性能优化 - 进一步简化 */
@media (max-width: 768px) {
    /* 移除悬停动画，提高性能 */
    .option:hover {
        transform: none;
        transition: none;
    }
    
    /* 优化滚动性能 */
    .sound-nav {
        -webkit-overflow-scrolling: touch;
        scroll-behavior: smooth;
        will-change: scroll-position;
        position: relative !important;
        top: auto !important;
        left: auto !important;
        right: auto !important;
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
    }
    
    /* 简化阴影效果 */
    .option {
        box-shadow: 0 1px 4px var(--color-shadow);
    }
    
    .option:hover {
        box-shadow: 0 1px 4px var(--color-shadow);
    }
    
    /* 移除不必要的动画 */
    .title-icon {
        animation: none;
    }
    
    /* 优化触摸响应 */
    button, input[type="range"], .nav-btn {
        touch-action: manipulation;
        -webkit-tap-highlight-color: transparent;
    }
    
    /* 优化触摸目标 */
    button, input[type="range"], .nav-btn {
        touch-action: manipulation;
    }
    
    /* 减少不必要的动画 */
    .title-icon {
        animation: none;
    }
    
    /* 优化字体渲染 */
    body {
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
        text-rendering: optimizeLegibility;
    }
}

/* 移动端卡片布局优化 - 更简洁的间距 */
@media (max-width: 768px) {
    .container {
        padding: 12px;
        width: 100%;
        max-width: 100%;
        box-sizing: border-box;
    }

    .sound-category, .directory, .timer-widget {
        margin-bottom: 12px;
        padding: 14px;
        border-radius: 12px;
    }
    
    /* 确保导航栏在容器内正确显示 - 最高优先级 */
    body .container .sound-nav,
    body .sound-nav,
    .sound-nav {
        position: relative !important;
        top: auto !important;
        left: auto !important;
        right: auto !important;
        width: 100% !important;
        max-width: 100% !important;
        box-sizing: border-box !important;
        z-index: 10 !important;
        transform: none !important;
        overflow: visible !important;
        float: none !important;
        clear: both !important;
    }

    .sound-category h2, .directory h2, .timer-widget h2 {
        font-size: 16px;
        margin-bottom: 10px;
    }

    .options {
        display: grid;
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .option {
        padding: 10px;
        border-radius: 10px;
        min-height: 120px;
    }

    .option-title {
        font-size: 15px;
        margin-bottom: 6px;
    }

    /* 优化计时器布局 */
    .timer-content {
        padding: 12px;
    }

    .timer-display {
        font-size: 24px;
        margin-bottom: 12px;
    }

    .timer-presets {
        display: grid;
        grid-template-columns: repeat(3, 1fr);
        gap: 8px;
        margin-bottom: 12px;
    }

    .timer-preset-btn {
        padding: 8px;
        font-size: 14px;
    }

    .timer-custom {
        display: flex;
        gap: 8px;
        margin-bottom: 12px;
    }

    .timer-custom input {
        flex: 1;
        padding: 8px;
        border-radius: 8px;
        font-size: 14px;
    }

    /* 优化收藏夹列表 */
    #favouriteSoundsList {
        max-height: 200px;
        margin-bottom: 12px;
    }

    #favouriteSoundsList li {
        padding: 8px 12px;
        font-size: 14px;
    }

    /* 优化页脚 */
    .site-footer {
        padding: 20px 16px;
        margin-top: 32px;
    }

    .footer-content {
        flex-direction: column;
        gap: 16px;
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 12px;
    }

    .footer-link {
        font-size: 14px;
    }

    /* 优化初始提示 */
    .initial-hint {
        padding: 12px 16px;
        font-size: 14px;
        border-radius: 12px;
        margin-bottom: 16px;
    }

    /* 优化滚动条 */
    ::-webkit-scrollbar {
        width: 4px;
        height: 4px;
    }

    ::-webkit-scrollbar-track {
        background: transparent;
    }

    ::-webkit-scrollbar-thumb {
        background: var(--primary-color);
        border-radius: 2px;
    }
}

/* 移动端动画和交互优化 - 简化动画效果 */
@media (max-width: 768px) {
    /* 简化过渡效果，提高性能 */
    .sound-category, .directory, .timer-widget,
    .option, .nav-btn, .select-button, .play-button, .stop-button,
    .volume-control, .timer-preset-btn {
        transition: transform 0.15s ease, box-shadow 0.15s ease;
    }

    /* 简化按钮点击效果 */
    .nav-btn:active,
    .select-button:active,
    .play-button:active,
    .stop-button:active,
    .control-btn:active {
        transform: scale(0.98);
        transition: transform 0.1s ease;
    }
    
    /* 移除复杂的悬停动画 */
    .option:hover {
        transform: none;
        box-shadow: 0 2px 8px var(--color-shadow);
    }
    
    /* 简化导航按钮悬停效果 */
    .nav-btn:hover {
        transform: none;
        box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    }

    /* 优化音量滑块 */
    .volume-control {
        -webkit-appearance: none;
        height: 4px;
        background: var(--primary-color);
        border-radius: 2px;
        outline: none;
    }

    .volume-control::-webkit-slider-thumb {
        -webkit-appearance: none;
        width: 16px;
        height: 16px;
        background: var(--primary-color);
        border-radius: 50%;
        cursor: pointer;
        transition: transform 0.2s ease;
    }

    .volume-control::-webkit-slider-thumb:active {
        transform: scale(1.2);
    }

    /* 优化播放状态动画 */
    .option.playing {
        animation: gentle-pulse 2s infinite;
    }

    @keyframes gentle-pulse {
        0% { transform: scale(1); }
        50% { transform: scale(1.02); }
        100% { transform: scale(1); }
    }

    /* 优化导航栏滚动提示 */
    .sound-nav::after {
        content: '';
        position: absolute;
        right: 0;
        top: 0;
        bottom: 0;
        width: 40px;
        background: linear-gradient(to right, transparent, var(--bg-color));
        pointer-events: none;
        opacity: 0;
        transition: opacity 0.3s ease;
    }

    .sound-nav.scrollable::after {
        opacity: 1;
    }

    /* 优化帮助侧边栏动画 */
    .help-content {
        transition: transform 0.3s ease, opacity 0.3s ease;
    }

    .help-sidebar.open .help-content {
        transform: translateX(0);
        opacity: 1;
    }

    /* 优化浮动按钮动画 */
    .floating-btn {
        transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    .floating-btn:active {
        transform: scale(0.9);
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    }

    /* 优化页面加载动画 */
    .page-loading {
        animation: fadeIn 0.3s ease;
    }

    .page-loaded .container {
        animation: fadeIn 0.5s ease;
    }

    /* 优化滚动到顶部/底部按钮 */
    .scroll-buttons {
        position: fixed;
        right: 16px;
        bottom: 80px;
        display: flex;
        flex-direction: column;
        gap: 8px;
        z-index: 1000;
    }

    .scroll-btn {
        width: 40px;
        height: 40px;
        border-radius: 50%;
        background: var(--primary-color);
        color: white;
        border: none;
        display: flex;
        align-items: center;
        justify-content: center;
        box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
        transition: transform 0.2s ease, box-shadow 0.2s ease;
    }

    .scroll-btn:active {
        transform: scale(0.9);
        box-shadow: 0 1px 4px rgba(0, 0, 0, 0.2);
    }
}