:root {
    --primary-color: #0066ff;
    --primary-dark: #0052cc;
    --success-color: #4CAF50;
    --success-dark: #45a049;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --background-light: #f8f9fa;
    --border-radius: 8px;
    --box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* 上传区域样式 */
.upload-section {
    background: white;
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 40px;
    text-align: center;
}

.upload-area {
    border: 2px dashed #ddd;
    border-radius: var(--border-radius);
    padding: 40px 20px;
    margin-bottom: 20px;
    background-color: var(--background-light);
    transition: all 0.3s ease;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background-color: #f0f7ff;
}

/* 上传按钮样式 */
label {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
    padding: 20px 40px;
    background-color: white;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    border-radius: var(--border-radius);
    transition: all 0.3s;
    min-width: 240px;
}

label:hover {
    background-color: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

label:hover .upload-icon {
    fill: white;
}

.upload-icon {
    width: 48px;
    height: 48px;
    fill: var(--primary-color);
    margin-bottom: 15px;
    transition: fill 0.3s;
}

/* 文件列表样式 */
.file-list {
    margin: 20px auto;
    max-width: 600px;
    background: white;
    border: 1px solid #eee;
    border-radius: var(--border-radius);
    overflow: hidden;
}

.file-item {
    display: flex;
    align-items: center;
    padding: 15px 20px;
    border-bottom: 1px solid #eee;
    background: white;
    transition: background-color 0.3s;
}

.file-item:hover {
    background-color: var(--background-light);
}

.file-item:last-child {
    border-bottom: none;
}

.file-name {
    flex: 1;
    margin: 0 15px;
    font-weight: 500;
    color: var(--text-primary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-size {
    color: var(--text-secondary);
    font-size: 0.9em;
    min-width: 80px;
    text-align: right;
}

/* 设置面板样式 */
.settings-panel {
    background: var(--background-light);
    padding: 30px;
    border-radius: var(--border-radius);
    margin: 30px auto;
    max-width: 600px;
}

.setting-group {
    margin-bottom: 25px;
}

.setting-group label {
    display: block;
    text-align: left;
    margin-bottom: 10px;
    color: var(--text-primary);
    font-weight: 500;
    background: none;
    border: none;
    padding: 0;
    min-width: auto;
}

/* 水平滑块容器样式 */
.volume-slider,
.noise-slider,
.fade-slider,
.speed-slider,
.pitch-slider {
    display: flex;
    align-items: center;
    gap: 15px;
    width: 100%;
}

/* 水平滑块样式 */
.volume-slider input[type="range"],
.noise-slider input[type="range"],
.fade-slider input[type="range"],
.speed-slider input[type="range"],
.pitch-slider input[type="range"] {
    flex: 1;
    -webkit-appearance: none;
    height: 6px;
    background: #ddd;
    border-radius: 3px;
    outline: none;
    width: calc(100% - 65px);
}

/* 滑块数值显示样式 */
.volume-slider span,
.noise-slider span,
.fade-slider span,
.speed-slider span,
.pitch-slider span {
    min-width: 65px;
    color: var(--text-secondary);
    font-size: 0.9em;
    text-align: right;
    font-family: monospace;
}

/* 垂直滑块样式 */
.eq-group input[type="range"] {
    writing-mode: bt-lr;
    -webkit-appearance: slider-vertical;
    width: 6px;
    height: 120px;
    padding: 0;
    margin: 0;
    background: #ddd;
    border-radius: 3px;
}

/* 滑块拇指样式 */
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    transition: background 0.3s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--primary-dark);
}

/* Firefox 垂直滑块支持 */
.eq-group input[type="range"] {
    writing-mode: bt-lr; /* IE */
    -webkit-appearance: slider-vertical; /* WebKit */
    width: 6px;
    height: 120px;
}

@-moz-document url-prefix() {
    .eq-group input[type="range"] {
        transform: rotate(270deg);
        width: 120px;
        height: 6px;
    }
}

#volume-value,
#fade-in-value,
#fade-out-value {
    min-width: 80px;
    color: var(--text-secondary);
    font-size: 0.9em;
}

/* 复选框样式 */
.checkbox-label {
    display: flex !important;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 18px;
    height: 18px;
    margin: 0;
}

/* 按钮样式 */
.primary-button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    padding: 15px 40px;
    font-size: 1.1em;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s;
    width: 100%;
    margin-top: 10px;
}

.primary-button:hover:not(:disabled) {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
}

.primary-button:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}

/* 进度和消息样式 */
.processing-message,
.success-message,
.error-message {
    margin: 20px 0;
    padding: 15px 20px;
    border-radius: var(--border-radius);
    font-weight: 500;
    text-align: center;
}

.processing-message {
    background-color: #e3f2fd;
    color: var(--primary-color);
    border: 1px solid #bbdefb;
}

.success-message {
    background-color: #e8f5e9;
    color: var(--success-color);
    border: 1px solid #c8e6c9;
}

.error-message {
    background-color: #ffebee;
    color: #d32f2f;
    border: 1px solid #ffcdd2;
}

/* 使用说明样式 */
.manual {
    background: white;
    padding: 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    margin-bottom: 40px;
}

.manual h2 {
    color: var(--text-primary);
    margin-bottom: 20px;
    font-size: 1.5em;
    display: flex;
    align-items: center;
    gap: 10px;
}

.manual-content {
    padding: 25px;
    background: var(--background-light);
    border-radius: var(--border-radius);
    border: 1px solid #eee;
}

.manual ol {
    padding-left: 25px;
    counter-reset: item;
    list-style: none;
}

.manual li {
    margin-bottom: 20px;
    color: var(--text-secondary);
    position: relative;
    padding-left: 15px;
    line-height: 1.6;
    counter-increment: item;
}

.manual li:before {
    content: counter(item);
    position: absolute;
    left: -25px;
    width: 24px;
    height: 24px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9em;
    font-weight: 500;
}

.manual li:last-child {
    margin-bottom: 0;
}

.manual strong {
    color: var(--primary-color);
    font-weight: 500;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .upload-section,
    .settings-panel,
    .manual {
        padding: 20px;
    }

    label {
        padding: 15px 30px;
        min-width: 200px;
    }
}

/* 均衡器部分样式 */
.equalizer-section {
    margin: 30px 0;
    padding: 25px;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.equalizer-section h3 {
    color: var(--text-primary);
    margin-bottom: 25px;
    font-size: 1.1em;
    text-align: center;
    font-weight: 500;
}

.eq-sliders {
    display: flex;
    justify-content: center;
    gap: 40px;
    padding: 20px 0;
    background: var(--background-light);
    border-radius: var(--border-radius);
}

.eq-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    width: 60px;
}

.eq-group label {
    color: var(--text-secondary);
    font-size: 0.9em;
    font-weight: 500;
    margin: 0;
    background: none;
    border: none;
    padding: 0;
    min-width: auto;
}

.eq-group span {
    color: var(--text-secondary);
    font-size: 0.9em;
    min-width: 45px;
    text-align: center;
    font-family: monospace;
}

/* 响应式设计补充 */
@media (max-width: 768px) {
    .equalizer-section {
        padding: 20px;
    }

    .eq-sliders {
        gap: 30px;
        padding: 15px 0;
    }

    .eq-group {
        width: 50px;
        gap: 10px;
    }

    input[type="range"][orient="vertical"] {
        height: 100px;
    }
}