/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 渐进渐出动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeOutDown {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(20px);
    }
}

.animate-fade-in {
    animation: fadeInUp 0.6s ease forwards;
}

.animate-fade-out {
    animation: fadeOutDown 0.4s ease forwards;
}

/* 延迟动画 */
.delay-100 {
    animation-delay: 0.1s;
}

.delay-200 {
    animation-delay: 0.2s;
}

.delay-300 {
    animation-delay: 0.3s;
}

.delay-400 {
    animation-delay: 0.4s;
}

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

/* 容器样式 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 头部样式 */
.header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
    animation-delay: 0.1s;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
}

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

/* 主内容区域 */
.main-content {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

/* 三列式布局容器 */
.three-column-layout {
    display: grid;
    grid-template-columns: 250px 1fr 300px;
    gap: 20px;
    align-items: start;
}

/* 左侧列：上传区域 */
.left-column {
    background-color: var(--bg-secondary);
    border-radius: 8px;
    padding: 20px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
    animation-delay: 0.2s;
}

/* 中间列：预览区域 */
.center-column {
    background-color: var(--bg-secondary);
    border-radius: 8px;
    padding: 30px;
    box-shadow: var(--shadow);
    min-width: 400px;
    border: 1px solid var(--border-color);
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
    animation-delay: 0.3s;
}

/* 确保预览区域有足够的宽度 */
.preview-section {
    width: 100%;
}

/* 右侧列：配置和操作区域 */
.right-column {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* 上传区域 */
.upload-section-small {
    width: 100%;
}

.upload-container {
    width: 100%;
}

.drop-zone-small {
    border: 2px dashed var(--border-color);
    border-radius: 8px;
    padding: 15px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--bg-tertiary);
}

.drop-zone-small:hover,
.drop-zone-small.dragover {
    border-color: var(--accent-primary);
    background-color: var(--bg-secondary);
}

.drop-zone-content-small {
    position: relative;
}

.icon-small {
    margin-bottom: 8px;
    color: var(--text-tertiary);
}

.drop-zone-small p {
    margin-bottom: 4px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.supported-formats-small {
    font-size: 0.75rem;
    color: var(--text-tertiary);
    margin-bottom: 12px;
}

.file-input {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.upload-button-small {
    display: inline-block;
    background-color: var(--accent-primary);
    color: #fff;
    padding: 6px 12px;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    font-size: 0.85rem;
}

.upload-button-small:hover {
    background-color: var(--accent-secondary);
}

.file-list-small {
    margin-top: 12px;
}

.file-item {
    display: flex;
    align-items: center;
    padding: 6px;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.75rem;
}

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

.file-name {
    flex: 1;
    font-size: 0.75rem;
    color: var(--text-primary);
}

.file-size {
    font-size: 0.7rem;
    color: var(--text-tertiary);
    margin-right: 6px;
}

.remove-file {
    background: none;
    border: none;
    color: var(--text-tertiary);
    cursor: pointer;
    font-size: 0.9rem;
    padding: 0 3px;
}

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

/* 预览区域 */
.preview-section {
    width: 100%;
}

.preview-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

.preview-pane {
    text-align: center;
}

.preview-pane h3 {
    font-size: 1rem;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.preview-wrapper {
    position: relative;
    width: 100%;
    height: 250px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
}

/* 响应式调整预览容器尺寸 */
@media (max-width: 768px) {
    .preview-container {
        grid-template-columns: 1fr;
    }
    
    .preview-wrapper {
        height: 300px;
    }
}

.preview-canvas {
    max-width: 100%;
    max-height: 100%;
}

.preview-controls {
    display: flex;
    justify-content: center;
    gap: 8px;
}

.preview-controls button {
    padding: 4px 8px;
    border: 1px solid var(--border-color);
    background-color: var(--bg-tertiary);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.85rem;
    color: var(--text-primary);
}

.preview-controls button:hover {
    background-color: var(--bg-secondary);
}



/* 配置区域 */
.config-section {
    background-color: var(--bg-secondary);
    border-radius: 8px;
    padding: 20px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.config-section h2 {
    font-size: 1.1rem;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.size-options {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 15px;
}

.size-option {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.size-checkbox {
    margin-right: 4px;
}

.filename-config {
    margin-bottom: 15px;
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
    animation-delay: 0.4s;
}

.filename-config label {
    display: block;
    margin-bottom: 4px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.filename-config input {
    width: 100%;
    padding: 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 0.9rem;
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* 进度和操作区域 */
.progress-action-section {
    background-color: var(--bg-secondary);
    border-radius: 8px;
    padding: 20px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
    animation-delay: 0.4s;
}

.progress-section {
    margin-bottom: 15px;
}

.progress-container {
    position: relative;
    width: 100%;
    height: 18px;
    background-color: var(--bg-tertiary);
    border-radius: 8px;
    overflow: hidden;
}

.progress-bar {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background-color: var(--accent-primary);
    border-radius: 8px;
    width: 0%;
    transition: width 0.3s ease;
}

.progress-text {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-primary);
}

.action-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.convert-button,
.download-button {
    width: 100%;
    background-color: var(--accent-primary);
    color: #fff;
    padding: 12px;
    border: none;
    border-radius: 4px;
    font-size: 0.95rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.convert-button:hover,
.download-button:hover {
    background-color: var(--accent-secondary);
}

.convert-button:disabled,
.download-button:disabled {
    background-color: var(--text-tertiary);
    cursor: not-allowed;
}

/* 历史记录区域 */
.history-section {
    background-color: var(--bg-secondary);
    border-radius: 8px;
    padding: 30px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.history-section h2 {
    font-size: 1.3rem;
    margin-bottom: 0;
    color: var(--text-primary);
}

.clear-history-button {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.clear-history-button:hover {
    background-color: var(--bg-secondary);
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.history-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 15px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--bg-tertiary);
}

.history-info {
    flex: 1;
}

.history-filename {
    font-weight: 500;
    margin-bottom: 5px;
    color: var(--text-primary);
}

.history-date {
    font-size: 0.8rem;
    color: var(--text-tertiary);
}

.history-download {
    background-color: var(--accent-primary);
    color: #fff;
    padding: 8px 16px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.history-download:hover {
    background-color: var(--accent-secondary);
}

/* 错误模态框 */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal.show {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background-color: var(--bg-secondary);
    border-radius: 8px;
    padding: 30px;
    max-width: 400px;
    width: 90%;
    position: relative;
    border: 1px solid var(--border-color);
}

.modal-content h3 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.modal-content p {
    margin-bottom: 20px;
    color: var(--text-secondary);
}

.close-modal {
    position: absolute;
    top: 10px;
    right: 15px;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-tertiary);
}

.close-modal:hover {
    color: var(--text-primary);
}

/* 页脚样式 */
.footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    color: var(--text-tertiary);
    font-size: 0.9rem;
}

/* 返回按钮样式 */
.back-button {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: var(--button-bg);
    color: var(--button-text);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
}

.back-button:hover {
    background: var(--button-bg-hover);
    transform: translateX(-2px);
}

.back-button svg {
    width: 16px;
    height: 16px;
}

.footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    color: var(--text-tertiary);
    font-size: 14px;
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
    animation-delay: 0.6s;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .three-column-layout {
        grid-template-columns: 1fr 1fr;
    }

    .left-column {
        grid-column: 1 / -1;
    }

    .center-column {
        grid-column: 1 / -1;
    }

    .right-column {
        grid-column: 1 / -1;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 10px;
    }

    .header h1 {
        font-size: 2rem;
    }

    .three-column-layout {
        grid-template-columns: 1fr;
    }

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

    .size-options {
        justify-content: center;
    }

    .drop-zone {
        padding: 20px;
    }

    .upload-section,
    .config-section,
    .preview-section,
    .progress-section,
    .download-section,
    .history-section {
        padding: 20px;
    }
}

@media (max-width: 480px) {
    .header h1 {
        font-size: 1.5rem;
    }

    .preview-wrapper {
        height: 200px;
    }

    .convert-button,
    .download-button {
        padding: 10px;
        font-size: 1rem;
    }
}