:root {
    --primary-color: #4361ee;
    --success-color: #2ea44f;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-color: #f3f4f6;
    --card-bg: #ffffff;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --radius: 8px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
}

.app-container {
    min-height: 100vh;
    padding: 2rem;
}

.app-header {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem 0;
}

.header-content h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.header-content p {
    color: var(--text-light);
    font-size: 1.1rem;
}

.card-shadow {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
}

.card-shadow:hover {
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.upload-area {
    border: 2px dashed var(--border-color);
    padding: 3rem;
    text-align: center;
    cursor: pointer;
    margin-bottom: 2rem;
}

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

.upload-hint {
    width: 100%;
    display: flex;
    justify-content: center;
}

.upload-hint i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.btn-primary, .btn-success {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    font-size: 1rem;
    padding: 1.2rem;
    width: 100%;
    justify-content: center;
    max-width: 90%;
    margin: 0 auto;
}

.btn-primary:hover {
    background-color: #3651d1;
}

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

.btn-success:hover {
    background-color: #2c974b;
}

.file-list {
    padding: 1.5rem;
    margin: 2rem 0;
}

.file-items {
    max-height: 300px;
    overflow-y: auto;
    padding: 0.5rem;
}

.file-item {
    display: flex;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.2s ease;
}

.file-item:hover {
    background-color: #f9fafb;
}

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

.file-item img {
    width: 60px;
    height: 60px;
    object-fit: cover;
    border-radius: var(--radius);
    margin-right: 1rem;
}

.file-info {
    flex: 1;
}

.file-name {
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.file-size {
    font-size: 0.875rem;
    color: var(--text-light);
}

.remove-file {
    color: #ef4444;
    font-size: 1.25rem;
    padding: 0.5rem;
    cursor: pointer;
    transition: color 0.2s ease;
}

.remove-file:hover {
    color: #dc2626;
}

.settings-panel {
    padding: 1.5rem;
}

.settings-content {
    margin-top: 1rem;
}

.settings-panel h3 {
    color: var(--text-color);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.input-group {
    margin: 1.5rem 0;
}

input[type="text"],
input[type="number"],
select {
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: border-color 0.2s ease;
}

input[type="text"]:focus,
input[type="number"]:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.action-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

/* 加载动画优化 */
.loading-overlay {
    background: rgba(255, 255, 255, 0.95);
}

.spinner {
    border-top-color: var(--primary-color);
}

/* 移动端适配优化 */
@media (max-width: 768px) {
    .app-container {
        padding: 0.5rem;
    }

    .header-content h1 {
        font-size: 1.8rem;
        margin-bottom: 0.5rem;
    }

    .header-content p {
        font-size: 0.9rem;
        padding: 0 1rem;
    }

    /* 主布局调整 */
    .main-content {
        flex-direction: column;
        gap: 1rem;
    }

    .right-panel {
        width: 100%;
    }

    /* 上传区域调整 */
    .upload-area.compact {
        padding: 1.5rem;
        margin: 0.5rem 0;
    }

    .upload-area.compact .btn-primary {
        padding: 1rem;
        font-size: 1.1rem;
        height: 50px; /* 确保触摸区域足够大 */
    }

    /* 预览区域调整 */
    .preview-scroll {
        height: auto;
        max-height: 60vh;
    }

    .preview-container {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    /* 设置面板优化 */
    .settings-panel {
        padding: 1rem;
    }

    .settings-group {
        margin-bottom: 0.8rem;
        background: white;
    }

    /* 输入控件优化 */
    input[type="number"],
    input[type="text"],
    select,
    .btn-primary,
    .btn-success {
        height: 44px; /* 更适合触摸的高度 */
        font-size: 1rem;
    }

    /* 滑块优化 */
    input[type="range"]::-webkit-slider-thumb {
        width: 24px;
        height: 24px;
    }

    input[type="range"]::-moz-range-thumb {
        width: 24px;
        height: 24px;
    }

    /* 水印设置优化 */
    .watermark-controls {
        gap: 1.5rem;
    }

    .font-size-control {
        flex-wrap: wrap;
    }

    .color-picker input[type="color"] {
        width: 44px;
        height: 44px;
    }

    /* 底部固定按钮样式调整 */
    .top-buttons {
        position: fixed;
        bottom: 0;
        left: 0;
        right: 0;
        background: white;
        padding: 1rem;
        padding-bottom: env(safe-area-inset-bottom, 2rem);
        box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
        z-index: 100;
        margin: 0;
    }

    /* 为底部按钮预留足够的空间 */
    .settings-panel {
        padding-bottom: 250px;
    }

    /* 确保内容可以滚动 */
    .settings-content {
        overflow-y: auto;
        max-height: none;
        overflow: visible;
        padding-bottom: 1rem;
    }

    /* 优化滚动体验 */
    .settings-content::-webkit-scrollbar {
        width: 6px;
    }

    .settings-content::-webkit-scrollbar-track {
        background: var(--bg-color);
        border-radius: 3px;
    }

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

    /* 确保底部按钮始终可见且不透明 */
    .top-buttons {
        background: white;
        border-top: 1px solid var(--border-color);
    }

    /* 调整按钮样式 */
    .top-buttons .btn-primary,
    .top-buttons .btn-success {
        margin-bottom: 0.5rem;
        height: auto;
        min-height: 44px;
    }

    /* 优化触摸体验 */
    .checkbox-label {
        min-height: 44px;
        padding: 0.5rem 0;
    }

    /* 加载动画调整 */
    .loading-overlay {
        padding: 2rem;
    }

    .spinner {
        width: 40px;
        height: 40px;
        border-width: 4px;
    }

    /* 统一容器宽度 */
    .left-panel,
    .right-panel,
    .upload-area,
    .preview-section,
    .settings-panel {
        width: 100%;
        max-width: 100%;
        margin: 0 auto;
        border-radius: var(--radius);
    }

    /* 折叠面板样式 */
    .settings-group {
        margin-bottom: 0.8rem;
        border: 1px solid var(--border-color);
        border-radius: var(--radius);
        overflow: hidden;
    }

    .group-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 1rem;
        background: white;
        cursor: pointer;
    }

    .group-header h4 {
        margin: 0;
        font-size: 1rem;
        color: var(--text-color);
    }

    .group-header i {
        transition: transform 0.3s ease;
    }

    .group-content {
        padding: 0;
        max-height: 0;
        overflow: hidden;
        transition: all 0.3s ease;
        background: white;
    }

    .settings-group.active .group-content {
        padding: 1rem 1rem 2rem;
        max-height: none;
    }

    .settings-group.active .group-header i {
        transform: rotate(180deg);
    }

    /* 优化水印控件在折叠面板中的样式 */
    .watermark-controls {
        gap: 1.5rem;
    }

    .watermark-controls .checkbox-label {
        margin-bottom: 0.5rem;
    }

    .watermark-controls .styled-input,
    .watermark-controls .font-size-control,
    .watermark-controls .color-picker,
    .watermark-controls .opacity-control {
        margin-left: 0.5rem;
    }
}

/* 适配超小屏幕 */
@media (max-width: 360px) {
    .header-content h1 {
        font-size: 1.5rem;
    }

    .dimension-inputs {
        flex-direction: column;
        align-items: stretch;
    }

    .dimension-inputs input {
        width: 100%;
    }
}

/* 图片预览区域样式 */
.image-preview {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
    padding: 1rem;
}

.original, .compressed {
    flex: 1;
    padding: 1rem;
    background: var(--card-bg);
    box-shadow: var(--shadow-sm);
}

.image-preview img {
    width: 100%;
    height: auto;
    margin-bottom: 1rem;
}

.image-info {
    font-size: 0.875rem;
    color: var(--text-light);
    padding: 0.5rem;
    background: var(--bg-color);
    border-radius: var(--radius);
}

/* 加载动画样式补充 */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.95);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid #f3f3f3;
    border-top: 5px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 水印和滤镜设置样式补充 */
.watermark-settings,
.filter-settings,
.format-settings {
    margin-bottom: 1.5rem;
    padding: 1.5rem;
    background: var(--bg-color);
    border-radius: var(--radius);
}

.watermark-settings input[type="text"] {
    width: 200px;
    margin: 0 0.5rem;
}

.watermark-settings input[type="color"] {
    padding: 0;
    width: 50px;
    height: 30px;
    margin: 0 0.5rem;
}

.watermark-settings input[type="range"] {
    width: 200px;
    margin: 0 0.5rem;
}

/* 修复 range 输入样式 */
input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: linear-gradient(to right, var(--primary-color) 0%, var(--primary-color) 50%, var(--border-color) 50%, var(--border-color) 100%);
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: white;
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    background: var(--primary-color);
}

/* Firefox 支持 */
input[type="range"]::-moz-range-track {
    height: 6px;
    border-radius: 3px;
}

input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: white;
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s ease;
}

input[type="range"]::-moz-range-thumb:hover {
    transform: scale(1.1);
    background: var(--primary-color);
}

/* 多图片预览容器 */
.preview-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2rem;
}

.preview-container .image-preview {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}

.preview-container .image-preview h3 {
    margin-bottom: 1rem;
    color: var(--text-color);
    font-size: 1.1rem;
}

.preview-container .preview-img {
    max-width: 100%;
    height: auto;
    margin-bottom: 1rem;
}

/* 主要布局 */
.main-content {
    display: flex;
    gap: 2rem;
    margin: 0 auto;
    max-width: 1400px;
}

.left-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.right-panel {
    width: 320px;
    background: var(--card-bg);
}

/* 上传区域紧凑样式 */
.upload-area.compact {
    padding: 2rem;
    margin-bottom: 1rem;
}

.upload-area.compact .upload-hint {
    width: 100%;
    justify-content: space-between;
}

.upload-area.compact .btn-primary {
    font-size: 1rem;
    width: 100%;
    padding: 1rem;
}

/* 预览区域 */
.preview-section {
    flex: 1;
    background: var(--card-bg);
    overflow: hidden;
}

.preview-scroll {
    height: calc(100vh - 250px);
    overflow-y: auto;
    padding: 1.5rem;
}

.preview-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.image-preview {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    background: var(--bg-color);
    padding: 1rem;
    border-radius: var(--radius);
}

/* 设置面板样式 */
.settings-panel {
    padding: 1.5rem;
}

.settings-title {
    font-size: 1.2rem;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-color);
}

.settings-group {
    margin-bottom: 1.5rem;
}

.settings-group h4 {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 0.5rem;
}

.styled-select {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    background: white;
}

.dimension-inputs {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.8rem;
    opacity: 1;
    transition: opacity 0.3s ease;
    flex-wrap: wrap;
}

.dimension-inputs input {
    width: 80px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-light);
}

.quality-slider {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* 修改按钮样式 */
.action-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.action-buttons button {
    width: 100%;
    justify-content: center;
}

/* 水印设置样式 */
.watermark-controls {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.color-picker {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.color-picker input[type="color"] {
    width: 40px;
    height: 30px;
    padding: 0;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
}

.opacity-slider {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.styled-input {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 0.9rem;
}

.styled-input:disabled,
.styled-select:disabled {
    background-color: var(--bg-color);
    cursor: not-allowed;
}

.preview-title {
    font-weight: 500;
    color: var(--text-color);
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.preview-images {
    display: flex;
    gap: 2rem;
}

.preview-images .original,
.preview-images .compressed {
    flex: 1;
}

.font-settings {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.font-size-control {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.font-size-control input[type="number"] {
    width: 60px;
    padding: 0.3rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 0.9rem;
}

.quality-control {
    background: var(--bg-color);
    padding: 1rem;
    border-radius: var(--radius);
}

.quality-description {
    font-size: 0.9rem;
    color: var(--text-light);
    margin-bottom: 0.8rem;
}

.opacity-control {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.opacity-control span {
    font-size: 0.9rem;
    color: var(--text-light);
}

.quality-slider,
.opacity-slider {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.5rem 0;
}

/* 美化滑块样式 */
input[type="range"] {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: linear-gradient(to right, var(--primary-color) 0%, var(--primary-color) 50%, var(--border-color) 50%, var(--border-color) 100%);
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: white;
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    background: var(--primary-color);
}

/* Firefox 支持 */
input[type="range"]::-moz-range-track {
    height: 6px;
    border-radius: 3px;
}

input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: white;
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s ease;
}

input[type="range"]::-moz-range-thumb:hover {
    transform: scale(1.1);
    background: var(--primary-color);
}

/* 禁用状态下的输入框样式 */
.dimension-inputs input[disabled],
.dimension-inputs .checkbox-label input[disabled] + span {
    opacity: 0.5;
    cursor: not-allowed;
}

/* 禁用状态下的输入框样式 */
input[type="number"]:disabled {
    background-color: var(--bg-color);
    cursor: not-allowed;
}

/* 顶部按钮样式 */
.top-buttons {
    margin: 0;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.top-buttons .btn-primary {
    background-color: var(--primary-color);
    font-size: 1.1rem;
    padding: 1rem;
}

.top-buttons .btn-success {
    font-size: 1rem;
    padding: 0.8rem;
}

/* 保持比例选项样式优化 */
.dimension-inputs .checkbox-label {
    margin-left: 0.5rem;
    white-space: nowrap;
    min-width: 85px;
}

/* 移动端适配 */
@media (max-width: 768px) {
    .dimension-inputs {
        gap: 1rem;
    }
    
    .dimension-inputs .checkbox-label {
        margin-left: 0;
        width: 100%;
    }
}