/* 全局样式 */
:root {
    --primary-color: #007AFF;
    --background-color: #F5F5F7;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --border-radius: 12px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background-color: var(--background-color);
    color: #1D1D1F;
    line-height: 1.5;
}

/* 顶部标题样式 */
.header {
    text-align: center;
    padding: 2rem 0;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.subtitle {
    color: #6E6E73;
    font-size: 1.1rem;
}

/* 主容器样式 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* 图片容器样式 */
.image-container {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
}

.image-box {
    flex: 1;
    background: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.image-box h2 {
    margin-bottom: 1rem;
    font-size: 1.2rem;
    color: #1D1D1F;
}

/* 上传区域样式 */
.upload-area {
    border: 2px dashed #CECED2;
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 200px;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background-color: #F5F5F7;
}

.upload-area img {
    width: 48px;
    height: 48px;
    margin-bottom: 1rem;
    opacity: 0.8;
    transition: all 0.3s ease;
}

.upload-area:hover img {
    opacity: 1;
    transform: scale(1.05);
}

.upload-area p {
    color: #6E6E73;
    margin-top: 0.5rem;
    font-size: 0.9rem;
}

/* 预览区域样式 */
.preview-area {
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius);
    background-color: #F5F5F7;
}

/* 控制面板样式 */
.control-panel {
    background: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.format-select, .size-control {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.size-inputs {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.input-group {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.input-group input {
    width: 80px;
    padding: 0.5rem;
    border: 1px solid #CECED2;
    border-radius: var(--border-radius);
    font-size: 0.9rem;
}

.multiply {
    color: #6E6E73;
    padding: 0 0.25rem;
}

.checkbox-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-left: 1rem;
    cursor: pointer;
}

.checkbox-container input {
    cursor: pointer;
}

/* 按钮样式 */
button {
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.convert-btn:hover {
    background-color: #0066CC;
}

.convert-btn:disabled {
    background-color: #CECED2;
    cursor: not-allowed;
}

.download-btn {
    background-color: #34C759;
    color: white;
}

.download-btn:hover {
    background-color: #2DB84C;
}

.download-btn:disabled {
    background-color: #CECED2;
    cursor: not-allowed;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .image-container {
        flex-direction: column;
    }
    
    .control-panel {
        flex-direction: column;
    }
    
    .format-select {
        width: 100%;
    }
}

/* 响应式调整 */
@media (min-width: 768px) {
    .control-panel {
        flex-direction: row;
        align-items: flex-end;
    }
}

/* 质量控制样式 */
.size-control {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.quality-slider {
    width: 100%;
    max-width: 300px;
}

.quality-slider input[type="range"] {
    width: 100%;
    height: 4px;
    background: #CECED2;
    border-radius: 2px;
    -webkit-appearance: none;
    appearance: none;
    outline: none;
}

.quality-slider input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
}

.quality-slider input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.quality-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 0.5rem;
    font-size: 0.8rem;
    color: #6E6E73;
}

#qualityValue {
    color: var(--primary-color);
    font-weight: 500;
}

/* 文件大小控制样式 */
.size-control {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid #CECED2;
}

.size-slider {
    margin: 1rem 0;
}

.size-slider input[type="range"] {
    width: 100%;
    height: 4px;
    background: #CECED2;
    border-radius: 2px;
    -webkit-appearance: none;
    appearance: none;
    outline: none;
}

.size-slider input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
}

.size-slider input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
}

.size-labels {
    display: flex;
    justify-content: space-between;
    margin-top: 0.5rem;
    font-size: 0.8rem;
    color: #6E6E73;
}

#currentQuality {
    color: var(--primary-color);
    font-weight: 500;
}

.recompress-btn {
    background-color: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    width: 100%;
    margin-top: 0.5rem;
}

.recompress-btn:hover {
    background-color: #0066CC;
}