/* 基础样式重置 */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --primary-color: #0070f3;
    --primary-hover: #0060df;
    --primary-light: rgba(0, 112, 243, 0.1);
    --success-color: #10b981;
    --success-hover: #059669;
    --success-light: rgba(16, 185, 129, 0.1);
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    --warning-color: #f59e0b;
    --text-primary: #1a1a1a;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --border-color: #e5e7eb;
    --border-radius: 8px;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
    --transition: all 0.2s ease;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* 全屏拖拽遮罩 - 更柔和的颜色 */
.drop-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(219, 234, 254, 0.92);
    z-index: 9999;
    display: none;
    justify-content: center;
    align-items: center;
    pointer-events: none;
    border: 4px dashed #1d4ed8;
}

.drop-overlay.active {
    display: flex;
}

.drop-overlay-content {
    text-align: center;
    color: #1e40af;
}

.drop-overlay-content i {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    animation: bounce 1s infinite;
}

.drop-overlay-content p {
    font-size: 1.5rem;
    font-weight: 500;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

/* 容器 */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* 头部 */
.header {
    text-align: center;
    margin-bottom: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.logo i {
    font-size: 2rem;
    color: var(--primary-color);
}

.logo h1 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* 上传区域 */
.upload-section {
    margin-bottom: 2rem;
}

.upload-area {
    background-color: var(--bg-primary);
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--primary-color);
    background-color: var(--primary-light);
}

.upload-area i {
    font-size: 3rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.upload-area:hover i,
.upload-area.dragover i {
    color: var(--primary-color);
}

.upload-text {
    font-size: 1.125rem;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    font-weight: 500;
}

.upload-hint {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

/* 转换列表区域 */
.convert-list-section {
    background-color: var(--bg-primary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    margin-bottom: 2rem;
    overflow: hidden;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-tertiary);
    flex-wrap: wrap;
    gap: 1rem;
}

.section-header h2 {
    font-size: 1.125rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.section-header h2 i {
    color: var(--primary-color);
}

.batch-actions {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #ffffff;
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
}

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--border-color);
}

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

.btn-success:hover:not(:disabled) {
    background-color: var(--success-hover);
}

.btn-danger {
    background-color: var(--danger-color);
    color: #ffffff;
}

.btn-danger:hover:not(:disabled) {
    background-color: var(--danger-hover);
}

.btn-icon {
    padding: 0.5rem;
    min-width: 36px;
    justify-content: center;
}

/* 转换列表 */
.convert-list {
    max-height: 500px;
    overflow-y: auto;
}

.empty-state {
    padding: 3rem 2rem;
    text-align: center;
    color: var(--text-muted);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
}

/* 转换项目 */
.convert-item {
    border-bottom: 1px solid var(--border-color);
}

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

.convert-item-header {
    display: flex;
    align-items: center;
    padding: 1rem 1.5rem;
    gap: 1rem;
    transition: var(--transition);
}

.convert-item-header:hover {
    background-color: var(--bg-secondary);
}

/* 复选框样式 */
.item-checkbox {
    flex-shrink: 0;
}

.item-checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.file-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--bg-tertiary);
    border-radius: var(--border-radius);
    color: var(--text-secondary);
    flex-shrink: 0;
}

.file-icon.audio {
    color: var(--primary-color);
    background-color: var(--primary-light);
}

.file-icon.video {
    color: var(--success-color);
    background-color: var(--success-light);
}

.file-info {
    flex: 1;
    min-width: 0;
}

.file-name {
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 0.25rem;
}

.file-meta {
    font-size: 0.8125rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.target-format {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.target-format i {
    color: var(--primary-color);
}

.target-format-badge {
    background-color: var(--bg-tertiary);
    padding: 0.25rem 0.625rem;
    border-radius: 4px;
    font-weight: 500;
    text-transform: uppercase;
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid transparent;
}

.target-format-badge:hover {
    background-color: var(--primary-light);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.item-status {
    flex-shrink: 0;
}

.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.25rem 0.625rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
}

.status-badge.pending {
    background-color: var(--bg-tertiary);
    color: var(--text-secondary);
}

.status-badge.uploading,
.status-badge.processing {
    background-color: var(--primary-light);
    color: var(--primary-color);
}

.status-badge.completed {
    background-color: var(--success-light);
    color: var(--success-color);
}

.status-badge.error {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
}

.item-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}

.expand-btn {
    background: none;
    border: none;
    padding: 0.5rem;
    cursor: pointer;
    color: var(--text-muted);
    transition: var(--transition);
    border-radius: var(--border-radius);
}

.expand-btn:hover {
    color: var(--text-primary);
    background-color: var(--bg-tertiary);
}

.expand-btn i {
    transition: transform 0.2s ease;
}

.expand-btn.expanded i {
    transform: rotate(180deg);
}

.delete-btn {
    background: none;
    border: none;
    padding: 0.5rem;
    cursor: pointer;
    color: var(--text-muted);
    transition: var(--transition);
    border-radius: var(--border-radius);
}

.delete-btn:hover {
    color: var(--danger-color);
    background-color: rgba(239, 68, 68, 0.1);
}

/* 手风琴展开内容 */
.convert-item-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    background-color: var(--bg-secondary);
}

.convert-item-body.expanded {
    max-height: 300px;
}

.convert-item-body-content {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
}

.format-selector-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.format-group {
    margin-bottom: 1rem;
}

.format-group:last-child {
    margin-bottom: 0;
}

.format-group-title {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.format-options {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.format-option {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.375rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--bg-primary);
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
}

.format-option:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* 推荐格式样式 */
.format-option.recommended {
    border-color: var(--success-color);
    color: var(--success-color);
}

.format-option.recommended .recommend-icon {
    color: var(--success-color);
    font-size: 0.75rem;
}

/* 选中状态 - 优先级最高 */
.format-option.selected {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: #ffffff;
}

.format-option.selected .recommend-icon {
    color: #ffffff;
}

/* 进度条 */
.progress-bar {
    width: 100%;
    height: 4px;
    background-color: var(--bg-tertiary);
    border-radius: 2px;
    overflow: hidden;
    margin-top: 0.5rem;
}

.progress-bar-fill {
    height: 100%;
    background-color: var(--primary-color);
    border-radius: 2px;
    transition: width 0.3s ease;
}

.progress-bar-fill.completed {
    background-color: var(--success-color);
}

/* 格式说明 */
.format-info {
    background-color: var(--bg-primary);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.format-info h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.format-info h3 i {
    color: var(--primary-color);
}

.format-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.format-card h4 {
    font-size: 0.9375rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.format-card h4 i {
    color: var(--text-muted);
}

.format-card ul {
    list-style: none;
}

.format-card li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border-color);
}

.format-card li:last-child {
    border-bottom: none;
}

.format-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.format-desc {
    display: block;
    margin-top: 5px;
    font-size: 0.8125rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* 页脚 */
.footer {
    text-align: center;
    padding: 1rem;
    color: var(--text-muted);
    font-size: 0.8125rem;
}

/* 确认对话框 */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 10000;
    display: none;
    justify-content: center;
    align-items: center;
}

.modal-overlay.active {
    display: flex;
}

.modal-content {
    background-color: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    max-width: 400px;
    width: 90%;
    box-shadow: var(--shadow-md);
}

.modal-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.modal-title i {
    color: var(--warning-color);
}

.modal-message {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-size: 0.9375rem;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    .logo h1 {
        font-size: 1.5rem;
    }

    .logo i {
        font-size: 1.5rem;
    }

    .upload-area {
        padding: 2rem 1rem;
    }

    .upload-area i {
        font-size: 2.5rem;
    }

    .upload-text {
        font-size: 1rem;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .batch-actions {
        width: 100%;
    }

    .batch-actions .btn {
        flex: 1;
        justify-content: center;
    }

    .convert-item-header {
        flex-wrap: wrap;
        padding: 1rem;
    }

    .item-checkbox {
        order: 0;
    }

    .file-icon {
        order: 1;
    }

    .file-info {
        width: calc(100% - 90px);
        order: 2;
    }

    .target-format {
        order: 4;
        width: 100%;
        margin-top: 0.5rem;
        padding-left: 70px;
    }

    .item-status {
        order: 5;
        margin-top: 0.5rem;
        padding-left: 70px;
    }

    .item-actions {
        order: 3;
        margin-left: auto;
    }

    .convert-item-body-content {
        padding: 1rem;
    }

    .format-options {
        gap: 0.375rem;
    }

    .format-option {
        padding: 0.25rem 0.5rem;
        font-size: 0.75rem;
    }

    .drop-overlay-content i {
        font-size: 3rem;
    }

    .drop-overlay-content p {
        font-size: 1.125rem;
    }
}

@media (max-width: 480px) {
    .convert-item-header {
        gap: 0.75rem;
    }

    .file-icon {
        width: 36px;
        height: 36px;
    }

    .file-info {
        width: calc(100% - 82px);
    }

    .target-format {
        padding-left: 62px;
    }

    .item-status {
        padding-left: 62px;
    }

    .btn {
        padding: 0.5rem 0.75rem;
        font-size: 0.8125rem;
    }
}

/* 滚动条样式 */
.convert-list::-webkit-scrollbar {
    width: 6px;
}

.convert-list::-webkit-scrollbar-track {
    background-color: var(--bg-tertiary);
}

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

.convert-list::-webkit-scrollbar-thumb:hover {
    background-color: var(--text-muted);
}

/* 加载动画 */
@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.fa-spin {
    animation: spin 1s linear infinite;
}

/* 错误信息 */
.error-message {
    color: var(--danger-color);
    font-size: 0.8125rem;
    padding: 0.5rem 1.5rem 1rem;
}