/* ========================================
   上传样式 - 专业版 v2.0
   ======================================== */

/* ==================== 上传区域 ==================== */
.upload-area {
    border: 3px dashed var(--gray-300);
    border-radius: var(--radius-lg);
    padding: 40px 24px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
    background: linear-gradient(135deg, var(--gray-50) 0%, var(--white) 100%);
    position: relative;
    overflow: hidden;
}

.upload-area::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-50) 0%, transparent 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.upload-area:hover {
    border-color: var(--primary-500);
    background: var(--primary-50);
    transform: scale(1.01);
}

.upload-area:hover::before {
    opacity: 1;
}

.upload-area.drag-over {
    border-color: var(--primary-600);
    background: var(--primary-100);
    transform: scale(1.03);
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.2);
}

.upload-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 16px;
    color: var(--gray-400);
    position: relative;
    z-index: 1;
    transition: all var(--transition-base);
}

.upload-area:hover .upload-icon {
    color: var(--primary-600);
    transform: translateY(-4px);
}

.upload-icon svg {
    width: 100%;
    height: 100%;
    filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.1));
}

.upload-text {
    font-size: 16px;
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 8px;
    position: relative;
    z-index: 1;
}

.upload-hint {
    font-size: 14px;
    color: var(--text-secondary);
    position: relative;
    z-index: 1;
    font-weight: 500;
}

/* ==================== 文件列表 ==================== */
.file-list {
    margin-top: 28px;
}

.file-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 20px;
    background: var(--white);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    margin-bottom: 14px;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-xs);
}

.file-item:hover {
    border-color: var(--primary-400);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.file-info {
    display: flex;
    align-items: center;
    gap: 14px;
    flex: 1;
}

.file-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-600);
    flex-shrink: 0;
}

.file-icon svg {
    width: 26px;
    height: 26px;
    stroke-width: 2.5;
}

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

.file-name {
    font-weight: 600;
    color: var(--gray-800);
    margin-bottom: 6px;
    word-break: break-all;
    font-size: 15px;
}

.file-meta {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
}

.file-size {
    margin-right: 14px;
}

.file-status {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-weight: 600;
}

.file-status.uploading {
    color: var(--warning);
}

.file-status.success {
    color: var(--success);
}

.file-status.error {
    color: var(--danger);
}

.file-actions {
    display: flex;
    gap: 10px;
}

.file-action-btn {
    min-width: 36px;
    height: 36px;
    border: none;
    background: transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    padding: 8px 14px;
    font-weight: 600;
}

.file-action-btn:hover {
    background: var(--gray-100);
    transform: scale(1.08);
}

.file-action-btn svg {
    width: 19px;
    height: 19px;
    flex-shrink: 0;
    stroke-width: 2.5;
}

.file-action-btn.delete:hover {
    background: linear-gradient(135deg, var(--danger-light) 0%, #fecaca 100%);
    color: var(--danger);
}

.delete-text {
    font-size: 14px;
    font-weight: 600;
    color: var(--danger);
}

/* ==================== 上传进度条 ==================== */
.file-progress {
    width: 100%;
    height: 5px;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin-top: 10px;
}

.file-progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-600) 0%, var(--primary-500) 100%);
    transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.4);
}

/* ==================== 上传提示 ==================== */
.upload-tips {
    background: linear-gradient(135deg, var(--primary-50) 0%, var(--primary-100) 100%);
    border: 2px solid var(--primary-300);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-top: 28px;
    box-shadow: var(--shadow-xs);
}

.upload-tips h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--primary-700);
    margin-bottom: 14px;
    letter-spacing: -0.2px;
}

.upload-tips ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.upload-tips li {
    font-size: 14px;
    color: var(--gray-700);
    padding: 8px 0;
    padding-left: 24px;
    position: relative;
    font-weight: 500;
}

.upload-tips li::before {
    content: '●';
    position: absolute;
    left: 8px;
    color: var(--primary-600);
    font-size: 16px;
}

/* ==================== 空状态 ==================== */
.file-list-empty {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-secondary);
}

.file-list-empty svg {
    width: 72px;
    height: 72px;
    margin: 0 auto 20px;
    opacity: 0.4;
    color: var(--gray-400);
}

.file-list-empty p {
    font-size: 15px;
    font-weight: 500;
}

/* ==================== 响应式调整 ==================== */
@media (max-width: 768px) {
    .upload-area {
        padding: 32px 16px;
    }

    .upload-icon {
        width: 48px;
        height: 48px;
    }

    .file-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 14px;
    }

    .file-info {
        width: 100%;
    }

    .file-actions {
        width: 100%;
        justify-content: flex-end;
    }

    .upload-tips {
        padding: 18px;
    }
}